# EDGAR Filing Document

**Accession Number:** 0001603454
**File Stem:** 0001641172-25-021651
**Filing Date:** 2025-7
**Character Count:** 228391
**Document Hash:** b54012544d4cea0aee27235b5e029dfe
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001641172-25-021651.hdr.sgml**: 20250731

**ACCESSION NUMBER**: 0001641172-25-021651

**CONFORMED SUBMISSION TYPE**: 424B5

**PUBLIC DOCUMENT COUNT**: 4

**FILED AS OF DATE**: 20250731

**DATE AS OF CHANGE**: 20250731

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Celcuity Inc.
- **CENTRAL INDEX KEY:** 0001603454
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MEDICAL LABORATORIES [8071]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 424B5
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-281887
- **FILM NUMBER:** 251169162

**BUSINESS ADDRESS:**
- **STREET 1:** 16305 36TH AVENUE N
- **STREET 2:** SUITE 100
- **CITY:** MINNEAPOLIS
- **STATE:** MN
- **ZIP:** 55446
- **BUSINESS PHONE:** 763-392-0767

**MAIL ADDRESS:**
- **STREET 1:** 16305 36TH AVENUE N
- **STREET 2:** SUITE 100
- **CITY:** MINNEAPOLIS
- **STATE:** MN
- **ZIP:** 55446

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Celcuity LLC
- **DATE OF NAME CHANGE:** 20140324

**Filed Pursuant to Rule 424(b)(5)<br> Registration No. 333-281887**

**PROSPECTUS SUPPLEMENT<br> (To Prospectus dated December 2, 2024)**

![A close-up of a logo AI-generated content may be incorrect.](form424b5_001.jpg)

**Celcuity Inc.**

**1,836,842 Shares of** **Common Stock**

**Pre-Funded Warrants to Purchase 400,000 Shares of Common Stock**

We are offering 1,836,842 of shares of our common stock and pre-funded warrants to purchase 400,000 shares of common stock. The purchase price of each pre-funded warrant will equal the price per share at which shares of our common stock are being sold to the public in this offering, minus $0.001, which will be the exercise price of each pre-funded warrant. Each pre-funded warrant will be exercisable for one share of common stock. The pre-funded warrants do not expire, and each pre-funded warrant will be exercisable at any time after the date of issuance. This prospectus supplement also relates to the offering of the shares of our common stock issuable upon the exercise of such pre-funded warrants.

In addition, we have granted the underwriters an option to purchase, in whole or in part, for a period of 30 days from the date of this prospectus supplement, up to 335,526 additional shares of our common stock at the public offering price less underwriting discounts and commissions.

Our common stock is listed on The Nasdaq Capital Market ("Nasdaq") under the symbol "CELC." On July 29, 2025, the last reported sale price of our common stock on Nasdaq was $38.50 per share.

**CONCURRENT TRANSACTION**

Concurrently with this offering, we are conducting a public offering (the "Concurrent Convertible Notes Offering") of $175,000,000 aggregate principal amount of our 2.750% Convertible Senior Notes due 2031 (the "convertible notes") (or up to $201,250,000 aggregate principal amount if the underwriters in the Concurrent Convertible Notes Offering exercise their over-allotment option in full). Neither this offering nor the Concurrent Convertible Notes Offering is conditioned upon the completion of the other, so it is possible that this offering occurs and the Concurrent Convertible Notes Offering does not occur, or vice versa. We cannot assure you that the Concurrent Convertible Notes Offering will be completed on the terms described herein, on significantly different terms, or at all. The Concurrent Convertible Notes Offering is being made pursuant to a separate prospectus supplement, and nothing contained herein shall constitute an offer to sell or the solicitation of an offer to buy our convertible notes to be issued in the Concurrent Convertible Notes Offering. See "Prospectus Supplement Summary - Recent Developments," "Use of Proceeds" and "Description of the Concurrent Convertible Notes Offering."

**Investing in our common stock involves risks. See "Risk Factors" beginning on page [S-7](#a_006) of this prospectus supplement, in the accompanying prospectus and in the documents incorporated by reference into this prospectus supplement and the accompanying prospectus.**

**Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.**

---

| | | | |
|:---|:---|:---|:---|
|  | **Per Share** | **Per Pre-Funded Warrant** | **Total<sup>(2)</sup>** |
| Public offering price | $38.000 | $37.999 | $84999596.000 |
| Underwriting discount and commissions <sup>(1)</sup> | $2.280 | $2.280 | $5099999.760 |
| Proceeds to us, before expenses | $35.720 | $35.719 | $79899596.240 |

---

(1) See "Underwriting" for a description of compensation to the underwriters.

(2) Assumes no exercise of the underwriters' option to purchase additional shares.

We expect that delivery of the shares of our common stock and pre-funded warrants will be made on or about July 31, 2025.

We have granted the underwriters an option for a period of 30 days to purchase up to an additional 335,526 shares of our common stock at the public offering price less underwriting discounts and commissions.

*Joint Book-Running Managers*

---

| | | |
|:---|:---|:---|
| **Jefferies** | **TD Cowen** | **Leerink Partners** |

---

 

*Passive Bookrunner*

 

**LifeSci Capital**

The date of this prospectus supplement is July 30, 2025.

**TABLE OF CONTENTS**

**Prospectus Supplement**

---

| | |
|:---|:---|
| [ABOUT THIS PROSPECTUS SUPPLEMENT](#a_001) | S-ii |
| [PRESENTATION OF INFORMATION](#a_002) | S-iii |
| [SPECIAL NOTE ABOUT FORWARD-LOOKING STATEMENTS](#a_003) | S-iv |
| [PROSPECTUS SUPPLEMENT SUMMARY](#a_004) | S-1 |
| [THE OFFERING](#a_005) | S-4 |
| [RISK FACTORS](#a_006) | S-7 |
| [USE OF PROCEEDS](#a_007) | S-12 |
| [DILUTION](#a_008) | S-13 |
| [DESCRIPTION OF PRE-FUNDED WARRANTS](#sj_001) | S-14 |
| [DESCRIPTION OF THE CONCURRENT CONVERTIBLE NOTES OFFERING](#a_009) | S-16 |
| [MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS](#a_010) | S-17 |
| [UNDERWRITING](#a_011) | S-21 |
| [LEGAL MATTERS](#a_012) | S-29 |
| [EXPERTS](#a_013) | S-29 |
| [INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE](#a_014) | S-30 |

---

**Prospectus**

---

| | |
|:---|:---|
|  | **Page** |
| [About this Prospectus](#ar_002) | 2 |
| [Our Company](#ar_003) | 3 |
| [Risk Factors](#ar_004) | 6 |
| [Forward-Looking Statements](#ar_005) | 6 |
| [Use of Proceeds](#ar_006) | 8 |
| [Plan of Distribution](#ar_007) | 9 |
| [Securities We May Offer](#ar_008) | 11 |
| [Description of Capital Stock](#ar_009) | 11 |
| [Description of Warrants](#ar_010) | 13 |
| [Description of Debt Securities](#ar_011) | 14 |
| [Description of Units](#ar_012) | 19 |
| [Where You Can Find More Information](#ar_013) | 20 |
| [Incorporation of Certain Documents by Reference](#ar_014) | 20 |
| [Legal Matters](#ar_015) | 20 |
| [Experts](#ar_016) | 20 |

---

i

**ABOUT THIS PROSPECTUS SUPPLEMENT**

This prospectus supplement is part of a registration statement that we filed with the U.S. Securities and Exchange Commission (the "SEC") under the Securities Act of 1933, as amended, using a "shelf" registration process. This document consists of two parts. The first part is this prospectus supplement, which describes the specific terms of this offering. The second part is the accompanying prospectus, which describes more general information, some of which may not apply to this offering. If there is any inconsistency between the information in the accompanying prospectus and this prospectus supplement, you should rely on this prospectus supplement. Before purchasing any securities, you should carefully read both this prospectus supplement and the accompanying prospectus, together with the documents incorporated by reference and the additional information described under the heading "Incorporation of Certain Documents by Reference."

We have not, and the underwriters have not, authorized anyone to provide you with any information or to make any representations other than those contained in this prospectus supplement, the accompanying prospectus or any related free writing prospectuses prepared by or on behalf of us or to which we have referred you. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. We are offering to sell, and seeking offers to buy, our securities only in jurisdictions where offers and sales are permitted. We will not make an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. Persons outside the United States who come into possession of this prospectus supplement and the accompanying prospectus must inform themselves about, and observe any restrictions relating to, the offering of the securities and the distribution of this prospectus supplement and the accompanying prospectus outside the United States. This prospectus supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, any securities offered by this prospectus supplement and the accompanying prospectus by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation.

You should assume that the information appearing in this prospectus supplement and the accompanying prospectus is accurate only as of the date on its respective cover, that the information appearing in any applicable free writing prospectus is accurate only as of the date of that free writing prospectus, and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference, unless we indicate otherwise. Our business, financial condition, results of operations and prospects may have changed since those dates. This prospectus supplement incorporates by reference, and any related free writing prospectus may contain and incorporate by reference, market data and industry statistics and forecasts that are based on independent industry publications and other publicly available information. Although we believe these sources are reliable, we do not guarantee the accuracy or completeness of this information and we have not independently verified this information. In addition, the market and industry data and forecasts that may be included or incorporated by reference in this prospectus supplement, the accompanying prospectus or any applicable free writing prospectus may involve estimates, assumptions and other risks and uncertainties and are subject to change based on various factors, including those discussed under the heading "Risk Factors" contained in this prospectus supplement, the accompanying prospectus and any applicable free writing prospectus, and under similar headings in other documents that are incorporated by reference into this prospectus supplement. Accordingly, investors should not place undue reliance on this information.

This prospectus supplement, the accompanying prospectus, any related free writing prospectus issued by us (which we refer to as a "company free writing prospectus") and the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, contain and incorporate by reference information that you should consider when making your investment decision.

S-ii

**PRESENTATION OF INFORMATION**

In this prospectus supplement, all references to "we," "us," "our," the "Company" or "Celcuity" or similar designations refer to Celcuity Inc., unless otherwise indicated or the context otherwise requires.

S-iii

**SPECIAL NOTE ABOUT FORWARD-LOOKING STATEMENTS**

The Private Securities Litigation Reform Act of 1995 provides a "safe harbor" for forward-looking statements. This prospectus supplement, the accompanying prospectus, the documents incorporated by reference into this prospectus supplement and the accompanying prospectus or any related free writing prospectus, and other materials filed or to be filed with the SEC contain forward-looking statements regarding us, our business prospects and our results of operations that are subject to certain risks and uncertainties that could cause our actual business, prospects and results of operations to differ materially from those that may be anticipated by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those described in Part I, Item 1A, "Risk Factors" of our Annual Report on Form 10-K for the year ended December 31, 2024 (our "Annual Report"), Part II, Item 1A, "Risk Factors" of our Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025 (our "Q1 Quarterly Report"), and in our other filings with the SEC. Readers are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date such forward-looking statement is made. We expressly disclaim any intent or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. Readers are urged to carefully review and consider the various disclosures made by us in this prospectus supplement and in our other reports filed with the SEC that advise interested parties of the risks and uncertainties that may affect our business.

All statements, other than statements of historical facts, contained in this prospectus supplement, the accompanying prospectus, the documents incorporated by reference into this prospectus supplement and the accompanying prospectus or any related free writing prospectus, including statements regarding our plans, objectives and expectations for our business, operations and financial performance and condition, are forward-looking statements. In some cases, you can identify forward-looking statements by the following words: "anticipate," "believe," "continue," "could," "estimate," "expect," "intend," "may," "might," "target," "ongoing," "plan," "potential," "predict," "project," "should," "will," "would," or the negative of these terms or other comparable terminology, although not all forward-looking statements contain these words. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our results, performance or achievements to be materially different from the information expressed or implied by the forward-looking statements in this prospectus supplement, the accompanying prospectus, the documents incorporated by reference into this prospectus supplement and the accompanying prospectus or any related free writing prospectus. Additionally, our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments that we may make. Forward-looking statements may include, among other things, statements relating to:

● our clinical trial plans and the estimated timelines and costs for such trials;

● our plans to develop and commercialize our products, and our expectations about the market opportunity for gedatolisib and our ability to serve that market;

● our expectations with respect to our competitive advantages, including the potential efficacy of gedatolisib in various patient types alone or in combination with other treatments, and our interpretation of the Topline Data (as defined below);

● our expectations regarding the timeline of patient enrollment and results from clinical trials, including our ongoing Phase 3 VIKTORIA-1 clinical trial, ongoing Phase 3 VIKTORIA-2 clinical trial, and ongoing Phase 1b/2 clinical trial for gedatolisib;

● our expectations regarding our ability to obtain U. S. Food and Drug Administration approval to commercialize gedatolisib;

● our expectations regarding governmental laws and regulations affecting our operations, including, without limitation, developments in laws and regulations or their interpretation, including, among others, changes in tax laws and regulations internationally and in the U.S. and laws that affect our operations and our laboratory;

S-iv

● our expectations with respect to the development, validation, required approvals, costs and timelines of our drug candidate gedatolisib;

● our beliefs related to the potential benefits resulting from Breakthrough Therapy designation for gedatolisib;

● our plans with respect to research and development and related expenses for the foreseeable future;

● our beliefs about our ability to capitalize on the exclusive global development and commercialization rights obtained from our license agreement with Pfizer Inc. ("Pfizer") with respect to gedatolisib;

● our expectations regarding the future payments that may be owed to Pfizer under our license agreement with them;

● our beliefs with respect to the potential rate and degree of market acceptance, both in the United States and internationally, and clinical utility of gedatolisib;

● our revenue expectations;

● our expectations regarding business development activities, including collaborations with pharmaceutical companies;

● our plans with respect to pricing in the United States and internationally, and our ability to obtain reimbursement for our drug candidate, gedatolisib, including expectations as to our ability or the amount of time it will take to achieve successful reimbursement from third-party payors, such as commercial insurance companies and health maintenance organizations, and from government insurance programs, such as Medicare and Medicaid;

● our expectations as to the use of proceeds from our financing activities, including this offering and the Concurrent Convertible Notes Offering;

● our expectations with respect to availability of capital, including accessing our current debt facility or any other debt facility or other capital sources in the future, and our assumption that we will have adequate authorized shares for future equity issuances;

● our beliefs regarding the adequacy of our cash on hand to fund our clinical trials, capital expenditures, working capital, and other general corporate expenses, as well as the increased costs associated with being a public company;

● our beliefs with respect to potentially raising capital;

● our expectations regarding our ability to obtain and maintain intellectual property protection for our product candidates, including our gedatolisib drug candidate and our CELsignia platform and tests; and

● our expectations related to the incurrence of additional debt obligations under the A&R Loan Agreement.

These statements involve known and unknown risks, uncertainties and other factors that may cause our results or our industry's actual results, levels of activity, performance or achievements to be materially different from the information expressed or implied by these forward-looking statements. Certain risks, uncertainties and other factors include, but are not limited to, our limited operating history; our potential inability to develop, validate and commercialize gedatolisib on a timely basis or at all; the uncertainties and costs associated with clinical studies and with developing and commercializing biopharmaceuticals; the complexity and difficulty of demonstrating the safety and sufficient magnitude of benefit to support regulatory approval of gedatolisib and other products we may develop; challenges we may face in developing and maintaining relationships with pharmaceutical company partners; the uncertainty and costs associated with clinical trials; the uncertainty regarding market acceptance by physicians, patients, third-party payors and others in the medical community, and with the size of market opportunities available to us; difficulties we may face in managing growth, such as hiring and retaining a qualified sales force and attracting and retaining key personnel; changes in government regulations; tightening credit markets and limitations on access to capital; stock market volatility or other factors that may affect our ability to access capital on favorable terms or at all; changes to trade policy, including new or increased tariffs and changing import and export regulations; obtaining and maintaining intellectual property protection for our technology and time and expense associated with defending third-party claims of intellectual property infringement, investigations or litigation threatened or initiated against us; and risks related to the Concurrent Convertible Notes Offering. See "Risk Factors" in this prospectus supplement, our Annual Report, our Q1 Quarterly Report and in our other filings with the SEC for additional risks, uncertainties and other factors applicable to us.

In addition, statements that "we believe" and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date when made, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete. Our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

S-v

**PROSPECTUS SUPPLEMENT SUMMARY**

*This summary highlights selected information about us and this offering. This summary is not complete and does not contain all of the information that may be important to you. You should read carefully this prospectus supplement, the accompanying prospectus and any related company free writing prospectus, including the "Risk Factors" section, and the other documents that we refer to and incorporate by reference herein and therein for a more complete understanding of us and this offering. In particular, we incorporate by reference important business and financial information in this prospectus supplement. See "Incorporation of Certain Documents by Reference" in this prospectus supplement.*

**The Company**

We are a clinical-stage biotechnology company focused on the development of targeted therapies for the treatment of multiple solid tumor indications. Our lead therapeutic candidate is gedatolisib, a kinase inhibitor of the phosphatidylinositol 3-kinase ("PI3K"), serine/threonine-protein kinase protein kinase B ("AKT"), mechanistic target of rapamycin ("mTOR") pathway that binds to all class I PI3K isoforms and the mTOR complexes, mTORC1 and mTORC2. By targeting all class I PI3K isoforms and mTORC1/2, gedatolisib induces comprehensive inhibition of the PI3K/AKT/mTOR pathway. Its mechanism of action and pharmacokinetic properties are differentiated from other currently approved and investigational therapies that target PI3K or mTOR alone or together. A Phase 3 clinical trial, VIKTORIA-1, evaluating gedatolisib in combination with fulvestrant with or without palbociclib in patients with HR+/HER2- advanced breast cancer ("ABC") is currently enrolling patients. Our Phase 3 clinical trial, VIKTORIA-2, evaluating gedatolisib in combination with a CDK4/6 inhibitor and fulvestrant as first-line treatment for patients with endocrine treatment resistant HR+/HER2- ABC, is currently enrolling patients. The first patient was dosed in July of 2025. A Phase 1b/2 clinical trial, CELC-G-201, evaluating gedatolisib in combination with darolutamide in patients with metastatic castration resistant prostate cancer, is ongoing. An investigator sponsored trial has been initiated in collaboration with the Dana Farber Cancer Institute and Massachusetts General Hospital to evaluate gedatolisib in combination with abemaciclib and letrozole in patients with endometrial cancer.

We were organized as a Minnesota limited liability company in 2011 and commenced operations in 2012. On September 15, 2017, we converted from a Minnesota limited liability company into a Delaware corporation and changed our name from Celcuity LLC to Celcuity Inc.

Our principal executive office is located at 16305 36th Avenue North, Suite 100, Minneapolis, Minnesota. Our telephone number is (763) 392-0767, and our website is www.celcuity.com. The information contained on or accessible through our website is not incorporated by reference into, and should not be considered part of, this prospectus supplement, the accompanying prospectus or the information incorporated herein and therein by reference.

**Recent Developments**

***Clinical Data***

 ****

On July 28, 2025, we announced positive topline results (the "Topline Data") from the *PIK3CA* wild-type cohort of the Phase 3 VIKTORIA-1 clinical trial evaluating gedatolisib plus fulvestrant with and without palbociclib versus fulvestrant in adults with hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative, *PIK3CA* wild-type, locally advanced or metastatic breast cancer, following progression on, or after, treatment with a CDK4/6 inhibitor and an aromatase inhibitor.

In the trial, gedatolisib in combination with palbociclib and fulvestrant (the "gedatolisib triplet") demonstrated a statistically significant and clinically meaningful improvement in progression free survival ("PFS") among patients, reducing the risk of disease progression or death by 76% compared to fulvestrant (based on a hazard ratio [HR] of 0.24, 95% confidence interval [CI] 0.17-0.35; p<0.0001). The median PFS ("mPFS"), as assessed by blinded independent central review ("BICR"), was 9.3 months with the gedatolisib triplet versus 2.0 months with fulvestrant, an incremental improvement of 7.3 months.

Gedatolisib in combination with fulvestrant ("gedatolisib doublet") also demonstrated a statistically significant and clinically meaningful improvement in PFS among patients, reducing the risk of disease progression or death by 67% compared to fulvestrant (based on a HR of 0.33, 95% CI 0.24-0.48; p<0.0001). The median PFS ("mPFS"), as assessed by BICR, was 7.4 months with the gedatolisib doublet versus 2.0 months with fulvestrant, an incremental improvement of 5.4 months.

The topline efficacy data from the VIKTORIA-1 *PIK3CA* wild-type cohort established several new milestones in the history of drug development for HR+/HER2- ABC:

● The hazard ratios for the gedatolisib triplet and doublet are more favorable than have ever been reported by any Phase 3 trial for patients with HR+/HER2- ABC.

● The 7.3- and 5.4-months incremental improvements in mPFS for the gedatolisib triplet and gedatolisib doublet over fulvestrant, respectively, are higher than has ever been reported by any Phase 3 trial for patients with HR+/HER2- ABC receiving at least their second line of therapy.

● Gedatolisib is the first inhibitor targeting the PI3K/AKT/mTOR pathway to demonstrate positive Phase 3 results in patients with HR+/HER2-/ *PIK3CA* wild-type ABC whose disease progressed on or after treatment with a CDK4/6 inhibitor.

Treatment discontinuation due to a treatment-related adverse event for the gedatolisib triplet and gedatolisib doublet was lower than was observed in Arm D of the Phase 1b trial in patients with ABC, and lower than observed in any Phase 3 trials for currently approved drug combinations in HR+/HER2- ABC. Additionally, the gedatolisib triplet and gedatolisib doublet were better tolerated than was observed in the Phase 1b trial in patients with ABC, including lower rates of hyperglycemia and stomatitis.

Full data from the *PIK3CA* wild-type cohort of the VIKTORIA-1 clinical trial will be presented at an upcoming medical conference later this year. The Company expects to submit a New Drug Application for gedatolisib to the U.S. Food and Drug Administration in the fourth quarter of 2025. Topline data for the VIKTORIA-1 *PIK3CA* mutation cohort is expected by the end of 2025.

***Second Amendment to Amended and Restated Loan and Security Agreement; Term D Loan***

 ****

On July 28, 2025 we entered into the Second Amendment to Amended and Restated Loan and Security Agreement (the "Second Amendment" and our existing Amended and Restated Loan Agreement, as amended by the Second Amendment, the "A&R Loan Agreement" and the term loans pursuant to such A&R Loan Agreement, the "Term Loans") with Innovatus Life Sciences Lending Fund I, LP, a Delaware limited partnership ("Innovatus"), as collateral agent (in such capacity, the "Collateral Agent") and a lender, Oxford Finance LLC, a Delaware limited liability company ("Oxford"), as a lender, and the other lenders party thereto, pursuant to which the Existing A&R Loan Agreement (as defined below) was amended to (i) subject to certain terms and conditions, permit the issuance of the convertible notes and certain transactions in connection therewith, including the conversion thereof settled solely in common stock (together with cash in lieu of the issuance of any fractional share of common stock), (ii) permit capped call transactions, (iii) require an amendment fee payable by us to Oxford in the amount of $25,000, which was paid at the closing of the Second Amendment and (iv) extend to May 9, 2026 the expiration date of Innovatus' right to convert up to 20% of the outstanding principal of the Term A Loan (as defined below) into shares of our common stock at a price per share of $10.00.

 ****

In connection with the release of the Topline Data we believe that we have achieved the Term D Milestone (as defined in the A&R Loan Agreement) and therefore are eligible to incur an additional $30.0 million of indebtedness under the Term D Loan (as defined in the A&R Loan Agreement). We intend to draw down such $30.0 million in late August 2025 prior to the expiration of the Term D Draw Period (as defined in the A&R Loan Agreement) on August 31, 2025.

***Concurrent Convertible Notes Offering***

Concurrently with this offering, we are conducting a public offering (the "Concurrent Convertible Notes Offering") of $175,000,000 aggregate principal amount of our 2.750% Convertible Senior Notes due 2031 (the "convertible notes") (or up to $201,250,000 aggregate principal amount if the underwriters in the Concurrent Convertible Notes Offering exercise their over-allotment option in full). The Concurrent Convertible Notes Offering is being made pursuant to a separate prospectus supplement. Nothing contained herein shall constitute an offer to sell or the solicitation of an offer to buy the convertible notes in the Concurrent Convertible Notes Offering.

Neither this offering nor the Concurrent Convertible Notes Offering is conditioned upon the completion of the other, so it is possible that this offering occurs and the Concurrent Convertible Notes Offering does not occur, or vice versa. We cannot assure you that the Concurrent Convertible Notes Offering will be completed on the terms described herein, on significantly different terms, or at all. See "Description of the Concurrent Convertible Notes Offering."

***Preliminary Financial Results as of June 30, 2025***

 ****

Our cash, cash equivalents and short term investments are expected to be approximately $168.4 million as of June 30, 2025, as compared to $283.1 million as of June 30, 2024. The preceding preliminary financial information has been prepared by our management and should not be viewed as a substitute for full financial statements prepared in accordance with GAAP. Our independent registered public accounting firm has not audited, reviewed or performed any procedures with respect to this preliminary financial data or the accounting treatment thereof and does not express an opinion or any other form of assurance with respect thereto. We expect to complete our interim financial statements as of and for the three months and six months ended June 30, 2025 subsequent to the completion of this offering. While we are currently unaware of any items that would require us to make adjustments to the preceding financial information, it is possible that we or our independent registered public accounting firm may identify such items as we complete our interim financial statements. Accordingly, undue reliance should not be placed on this preliminary financial information. This preliminary financial information is not necessarily indicative of any future period and should be read together with the sections entitled "Special Note About Forward-Looking Statements" and "Risk Factors," and our condensed financial statements and the related notes incorporated by reference in this prospectus supplement.

**THE OFFERING**

*The summary below describes the principal terms of the offering. As used in this section, "we," "our" and "us" refer to Celcuity Inc.*

 

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| | |
|:---|:---|
| Issuer | Celcuity Inc. |
| Shares of Common Stock Offered | 1,836,842 shares. |
| Pre-Funded Warrants Offered | We are also offering, pre-funded warrants to purchase up to 400,000 shares of our common stock. Each pre-funded warrant is exercisable for one share of our common stock. The purchase price of each pre-funded warrant will equal the price per share at which shares of common stock are being sold to the public in this offering, less $0.001, which is the exercise price of each pre-funded warrant. The pre-funded warrants do not expire, and each pre-funded warrant will be exercisable at any time after the date of issuance until the date the warrant is exercised in full, subject to an ownership limitation. See "Description of pre-funded warrants" for additional information.<br>The lock-up restrictions described in this Prospectus Supplement under "Underwriting" will not apply to the issuance of shares of common stock upon the exercise of the pre-funded warrants during the 60-day period following the date of this prospectus supplement. |
| Option to Purchase Additional Shares | We have granted the underwriters an option to purchase, in whole or in part, for a period of 30 days from the date of this prospectus supplement, up to 335,526 of additional shares of our common stock. |
| Common Stock Outstanding Immediately Following this Offering | 46,498,837 shares, assuming no exercise of any pre-funded warrants offered or sold by us. |
| Offering Price | $38.00 per share of common stock and $37.999 per pre-funded warrant. |
| Concurrent Convertible Notes Offering | Concurrently with this offering, we are conducting a public offering of $175,000,000 aggregate principal amount of the convertible notes (or up to $201,250,000 aggregate principal amount if the underwriters in the Concurrent Convertible Notes Offering exercise their over-allotment option in full). Neither this offering nor the Concurrent Convertible Notes Offering is conditioned upon the completion of the other, so it is possible that this offering occurs and the Concurrent Convertible Notes Offering does not occur, or vice versa. We cannot assure you that the Concurrent Convertible Notes Offering will be completed on the terms described herein, on significantly different terms, or at all. |
| No Capped Call Transactions | In connection with the pricing of the Concurrent Convertible Notes Offering we have determined that we will not enter into the capped call transactions with one or more of the underwriters or affiliates thereof and/or other financial institutions (the "option counterparties") as initially contemplated. As a result of the our determination not to enter into the capped call transactions, certain investors in the convertible notes that were expecting to hedge their equity price risk through certain derivative transactions with the option counterparties may instead hedge their equity price risk after the pricing of the convertible notes by entering into derivative transactions with other parties or selling shares of the common stock, which could adversely affect the market price of our common stock and the convertible notes. |

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|:---|:---|
| The Nasdaq Capital Market Symbol | Our common stock is listed on The Nasdaq Capital Market under the symbol "CELC." On July 29, 2025, the last reported sale price of our common stock was $38.50 per share.<br>There is no established public trading market for the pre-funded warrants, and we do not expect a market to develop. We do not intend to list the pre-funded warrants on The Nasdaq Capital Market or any other national securities exchange or nationally recognized trading system. Without an active trading market, the liquidity of the pre-funded warrants will be limited. See "Description of pre-funded warrants." |
| Use of Proceeds | We estimate that the net proceeds to us from this offering of common stock and pre-funded warrants will be approximately $79.6 million (or approximately $91.6 million if the underwriters exercise their option to purchase additional shares of our common stock in full), after deducting the underwriting discounts and commissions and our estimated offering expenses.<br>We intend to use the net proceeds from this offering of common stock and pre-funded warrants together with the net proceeds from the Concurrent Convertible Notes Offering for working capital and general corporate purposes, which may include clinical trial expenditures, commercial launch expenditures, research and development expenditures, capital expenditures, expansion of business development activities and other general corporate purposes. See "Use of Proceeds." |
|  | Subject to the above, we may also use a portion of the net proceeds from this offering to acquire, in-license or invest in products, technologies or businesses that are complementary to our business. However, we currently have no agreements or commitments to complete any such transaction. |
| Risk Factors | Investing in our common stock and pre-funded warrants involves certain risks. See "Risk Factors" beginning on page [S-7](#a_006) of this prospectus supplement and in the related sections of the accompanying prospectus and in the documents incorporated by reference herein and therein for a discussion of factors to consider before deciding to purchase the securities offered hereby. |

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The number of shares of our common stock outstanding immediately after the offering is based on 38,914,208 shares of common stock outstanding as of June 30, 2025, plus 5,747,787 shares of common stock issuable upon the exercise of outstanding pre-funded warrants for nominal consideration, and does not include, as of that date:

● 5,075,566 shares of our common stock issuable upon the exercise of outstanding options at a weighted average exercise price of $10.44 per share;

● 2,131,510 shares of our common stock issuable upon the conversion of 213,151 shares of outstanding Series A Preferred Stock;

● 4,825,502 shares of our common stock issuable upon the exercise of outstanding warrants with a weighted-average exercise price of $8.26 per share;

● 4,295,153 shares of our common stock reserved for issuance under our Amended and Restated 2017 Stock Incentive Plan and our 2017 Employee Stock Purchase Plan;

● 340,952 shares of our common stock issuable upon conversion of certain outstanding Term Loans under our A&R Loan Agreement at a conversion price of $10.00 per share; and

● Any shares issuable upon conversion of the convertible notes.

Unless otherwise indicated, all information in this prospectus supplement assumes the underwriters do not exercise their option to purchase additional shares of our common stock in this offering and assumes that the pre-funded warrants that we are offering in this offering are not exercised.

**RISK FACTORS**

*An investment in our securities involves certain risks. You should carefully consider the risks described below and those discussed in our Annual Report under the section titled "Risk Factors" in Part I, Item 1A, in our Q1 Quarterly Report under the section titled "Risk Factors" in Part II, Item 1A, and in our other filings with the SEC before making an investment decision. Our business, financial condition or results of operations could be materially adversely affected by any of these risks. The market or trading price of our common stock could decline due to any of these risks, and you may lose all or part of your investment. You should also refer to the other information included and incorporated by reference in this prospectus supplement, the accompanying prospectus and any related free writing prospectus, especially our financial statements and related notes, before making an investment decision. As used in this section, "we," "our" and "us" refer to Celcuity Inc.*

 

**Risks Related to This Offering and to Our Common Stock and Pre-Funded Warrants**

***The issuance or sale of shares of our common stock, including the sale of any shares issuable upon exercise of any pre-funded warrants, or pre-funded warrants in the public markets, or the perception of such sales, could depress the trading price of our common stock and the convertible notes.***

 ****

We may conduct future offerings of our common stock, preferred stock, pre-funded warrants or other securities that are convertible into, or exercisable or exchangeable for, our common stock to finance our operations or fund acquisitions, or for other purposes. In addition, we have shares reserved and available for issuance pursuant to our 2017 Employee Stock Purchase Plan and our Amended and Restated 2017 Stock Incentive Plan. If we issue additional shares of our common stock or rights to acquire shares of our common stock, including, but not limited to, pre-funded warrants, or if any of our existing stockholders sells a substantial amount of our common stock, including any shares of common stock issuable upon exercise of any pre-funded warrants or if the market perceives that such issuances or sales may occur, then the trading price of our common stock could decline.

We and our executive officers and our board members certain holders of our outstanding capital stock have entered into lock-up agreements with the underwriters of this offering and the underwriters of the Concurrent Convertible Notes Offering under which we, for a period of 60 days from the date of this prospectus supplement, have agreed, subject to certain exceptions, not to sell, directly or indirectly, any of their shares of our common stock or related securities without the permission of Jefferies LLC, TD Securities (USA) LLC and Leerink Partners LLC, as the representatives of the underwriters. We refer to such period as the lock-up period. When the lock-up period expires, we, our executive officers and our board members will be able to sell our common stock in the public market, subject to compliance with applicable securities laws restrictions. Sales of a substantial number of such shares of our common stock upon expiration of the lock-up period or otherwise, the perception that such sales may occur, or early release of these agreements, could cause the market price of our common stock to fall or make it more difficult for you to sell your shares at a time and price that you deem appropriate.

***If you purchase common stock or pre-funded warrants in this offering, you will experience immediate and substantial dilution.***

 ****

Investors purchasing shares of common stock or pre-funded warrants in this offering will pay a price per share or pre-funded warrant, as applicable, that substantially exceeds the net tangible book value per share of our common stock. As a result, investors purchasing shares of common stock or pre-funded warrants in this offering will incur immediate dilution of $34.37 per share, representing the difference between the public offering price of $38.00 per share and $37.999 per pre-funded warrant and our as adjusted net tangible book value as of March 31, 2025.

This dilution is due to the substantially lower price paid by our investors who purchased shares of common stock prior to this offering as compared to the price offered to the public in this offering, and the exercise of stock options granted to our employees. As a result of the dilution to investors purchasing shares in this offering, investors may receive significantly less than the purchase price paid in this offering, if anything, in the event of our liquidation.

***You may experience future dilution as a result of future equity offerings.***

 ****

We may choose to raise additional capital due to market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. To the extent that additional capital is raised through the sale of equity or convertible debt or other equity linked securities, the issuance of these securities could result in further dilution to our stockholders or result in downward pressure on the price of our common stock.

***There is no public market for the pre-funded warrants being offered in this offering. The pre-funded warrants are not listed on any exchange and we do not intend to list the pre-funded warrants on any exchange.***

There is no public trading market for the pre-funded warrants being offered in this offering, and we do not expect a market to develop. In addition, we do not intend to list the pre-funded warrants on The Nasdaq Capital Market or any other national securities exchange or nationally recognized trading system. Without an active trading market, the liquidity of the pre-funded warrants will be limited.

***We will not receive a significant amount or any additional funds upon the exercise of the pre-funded warrants.***

Each pre-funded warrant is exercisable for $0.001 per share of common stock underlying such pre-funded warrant, which may be paid by way of a cashless exercise, in which the holder would receive upon such exercise the net number of shares of common stock determined according to the formula set forth in the pre-funded warrant. Accordingly, we will not receive a significant amount of additional funds (if any) upon the exercise of the pre-funded warrants.

***Except for the right to participate in certain dividends and distributions, holders of the pre-funded warrants will have no rights as stockholders until such holders exercise their pre-funded warrants and acquire shares of our common stock.***

Until holders of the pre-funded warrants exercise their pre-funded warrants and acquire shares of our common stock, such holders will have no rights with respect to the shares of common stock underlying such pre-funded warrants, except that the holder of a pre-funded warrant shall be entitled to participate in certain distributions, including cash dividends, if any, to all holders of our common stock for no consideration, subject to certain ownership limitations. Upon exercise of the pre-funded warrants, the holders will be entitled to exercise the rights of a holder of common stock only as to matters for which the record date occurs after the exercise date. See "Description of pre-funded warrants—no rights as a stockholder."

***Significant holders or beneficial holders of our common stock may not be permitted to exercise pre-funded warrants that they hold.***

A holder of a pre-funded warrant will not be entitled to exercise any portion of any pre-funded warrant which, upon giving effect to such exercise, would cause the aggregate number of shares of our common stock beneficially owned by the holder (together with its affiliates and other attribution parties, as defined under "Description of pre-funded warrants—exercise limitations") to exceed a certain percentage of the number of shares of our common stock that would be outstanding immediately after giving effect to the exercise. However, subject to certain limitations, any holder may increase or decrease such percentage to any other percentage not in excess of 19.99% upon at least 61 days' prior notice from the holder to us. As a result, you may not be able to exercise your pre-funded warrants for shares of our common stock at a time when it would be financially beneficial for you to do so. In such circumstance you could seek to sell your pre-funded warrants to realize value, but you may be unable to do so in the absence of an established trading market for the pre-funded warrants.

***If we do not maintain a current and effective registration statement relating to the shares of our common stock issuable upon exercise of the pre-funded warrants, holders will only be able to exercise such pre-funded warrants on a "cashless basis."***

If we do not maintain a current and effective registration statement relating to the shares of our common stock issuable upon exercise of the pre-funded warrants at the time that holders wish to exercise such pre-funded warrants, they will only be able to exercise them on a "cashless basis" provided that an exemption from registration is available. As a result, the number of shares of our common stock that holders will receive upon exercise of the pre-funded warrants will be fewer than it would have been had such holder exercised the warrant for cash, and holders may be limited in their ability to immediately sell shares upon exercise subject to volume or other securities law limitations. Further, if an exemption from registration is not available, holders would not be able to exercise on a cashless basis and would only be able to exercise their pre-funded warrants for cash if a current and effective registration statement relating to the shares of our common stock issuable upon exercise of the pre-funded warrants is available.

***The price of our common stock may fluctuate significantly, and you may not be able to resell shares of your common stock at or above the price you paid.***

 ****

Our stock price may be extremely volatile. The stock market in general and the market for smaller medical technology companies in particular have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. As a result of this volatility, investors may not be able to sell our common stock at or above the price they paid for such stock. The market price for our common stock may be influenced by many factors, including:

● the success of competitive products or technologies;

● results of existing or future clinical trials;

● regulatory or legal developments in the United States and other countries;

● developments or disputes concerning patent applications, issued patents or other proprietary rights;

● the recruitment or departure of key personnel;

● the level of expenses related to any of our products or clinical development programs;

● actual or anticipated changes in estimates as to financial results, development timelines or recommendations by securities analysts;

● operating results that fail to meet expectations of securities analysts that cover our company;

● variations in our financial results or those of companies that are perceived to be similar to us;

● changes in the structure of healthcare payment systems;

● market conditions in the pharmaceutical, biotechnology and medical technology sectors;

● sales of our stock by us, our insiders and our other stockholders;

● general economic and market conditions; and

● the other factors described in this "Risk Factors" section.

Additionally, companies that have experienced volatility in the market price of their stock have been subject to an increased incidence of securities class action litigation. We may be the target of this type of litigation in the future. Securities litigation against us could result in substantial costs and divert our management's attention from other business concerns, which could seriously harm our business.

***If securities or industry analysts do not publish research or reports about our business, or publish negative reports about our business, our stock price and trading volume could decline.***

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our business. We do not have any control over these analysts. There can be no assurance that analysts will cover us or provide favorable coverage. If one or more of the analysts who cover us downgrade our stock or change their opinion of our stock, our stock price would likely decline. If one or more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our stock price or trading volume to decline.

***We have broad discretion in the use of the net proceeds from this offering and may not use them effectively.***

 ****

Our management will have broad discretion in the application of the net proceeds from this offering and could spend the proceeds in ways that do not improve our results of operations or enhance the value of our common stock. You will not have the opportunity to influence our decisions on how to use our net proceeds from this offering. The failure by our management to apply these funds effectively could result in financial losses that could cause the price of our common stock to decline and delay the development of our product candidates. Pending their use, we may invest the net proceeds from this offering in a manner that does not produce income or that loses value.

**Risks Related to the Concurrent Convertible Notes Offering**

***The closing of this offering is not contingent upon the closing of the Concurrent Convertible Notes Offering, and vice versa.***

 ****

The closing of this offering is not contingent upon the closing of the Concurrent Convertible Notes Offering. Therefore, it is possible that this offering occurs and the Concurrent Convertible Notes Offering does not occur, and vice versa. We cannot assure you that the Concurrent Convertible Notes Offering will be completed on the terms described herein, on significantly different terms, or at all. Accordingly, if you decide to purchase shares of our common stock, you should be willing to do so whether or not we complete the Concurrent Convertible Notes Offering. This prospectus supplement is not an offer to sell or a solicitation of an offer to buy any of the convertible notes being offered in the Concurrent Convertible Notes Offering. See "Description of the Concurrent Convertible Notes Offering."

***The accounting method for the convertible notes could adversely affect our reported financial condition and results.***

 ****

The accounting method for reflecting the convertible notes on our balance sheet, accruing interest expense for the convertible notes and reflecting the underlying shares of our common stock in our reported diluted earnings per share may adversely affect our reported earnings and financial condition.

In accordance with applicable accounting standards, we expect that the convertible notes we are offering in the Concurrent Convertible Notes Offering will be reflected as a liability on our balance sheets, with the initial carrying amount equal to the principal amount of the convertible notes, net of issuance costs. The issuance costs will be treated as a debt discount for accounting purposes, which will be amortized into interest expense over the term of the convertible notes. As a result of this amortization, the interest expense that we expect to recognize for the convertible notes for accounting purposes will be greater than the cash interest payments we will pay on the convertible notes, which will result in lower reported income.

In addition, we expect that the shares of our common stock underlying the convertible notes will be reflected in our diluted earnings per share using the "if converted" method. Under that method, if the conversion value of the convertible notes exceeds their principal amount for a reporting period, then we will calculate our diluted earnings per share assuming that all of the convertible notes were converted at the beginning of the reporting period and that we issued shares of our common stock to settle the excess. The after-tax interest expense associated with the convertible notes will not be added back to the numerator of the diluted earnings per share calculation for these purposes. However, if reflecting the convertible notes in diluted earnings per share in this manner is anti-dilutive, or if the conversion value of the convertible notes does not exceed their principal amount for a reporting period, then the shares of our common stock underlying the convertible notes will not be reflected in our diluted earnings per share. The application of the if-converted method may reduce our reported diluted earnings per share, and accounting standards may change in the future in a manner that may adversely affect our diluted earnings per share.

We have not reached a final determination regarding the accounting treatment for the convertible notes nor the application of the if-converted method, and the description above is preliminary. Accordingly, we may account for the convertible notes and calculate diluted earnings per share in a manner that is significantly different than described above.

***Provisions in the indenture governing the convertible notes could delay or prevent an otherwise beneficial takeover of us.***

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Certain provisions in the convertible notes and the indenture governing the convertible notes could make a third-party attempt to acquire us more difficult or expensive. For example, if a takeover constitutes a fundamental change (as will be defined in the indenture governing the convertible notes), then, except as described in prospectus supplement related to the Concurrent Convertible Notes Offering, noteholders will have the right to require us to repurchase their convertible notes for cash. In addition, if a takeover constitutes a make-whole fundamental change (as will be defined in the indenture governing the convertible notes), then we may be required to temporarily increase the conversion rate. In either case, and in other cases, our obligations under the convertible notes and the indenture could increase the cost of acquiring us or otherwise discourage a third party from acquiring us or removing incumbent management, including in a transaction that noteholders or holders of our common stock may view as favorable.

***Not entering into the capped call transactions may affect the market price of the convertible notes and our common stock.***

In connection with the pricing of the convertible notes, we have determined that we will not enter into the capped call transactions with the option counterparties, as initially contemplated. As a result of our determination not to enter into the capped call transactions, certain investors in the convertible notes that were expecting to hedge their equity price risk through certain derivative transactions with the option counterparties may instead hedge their equity price risk after the pricing of the convertible notes by entering into derivative transactions with other parties or selling shares of the common stock, which could adversely affect the market price of the convertible notes and our common stock. The potential affect, if any, of these transactions and activities on the market price of the convertible notes or our common stock will depend in part on market conditions and cannot be ascertained at this time. We do not make any representation or prediction as to the direction or magnitude of any potential effect of such transactions or activities on the market price of the convertible notes or our common stock.

**USE OF PROCEEDS**

We estimate that the net proceeds to us from this offering of common stock and pre-funded warrants will be approximately $79.6 million (or approximately $91.6 million if the underwriters exercise in full their option to purchase additional shares), after deducting the underwriting discounts and commissions and our estimated offering expenses.

We estimate that the net proceeds to us from the Concurrent Convertible Notes Offering, if it is consummated as currently contemplated, will be approximately $169.1 million (or approximately $194.5 million if the underwriters in the Concurrent Convertible Notes Offering exercise their over-allotment option in full), after deducting the underwriting discounts and commissions and our estimated offering expenses.

We intend to use the net proceeds from this offering of common stock and pre-funded warrants, together with the net proceeds from the Concurrent Convertible Notes Offering for working capital and general corporate purposes. General corporate purposes may include clinical trial expenditures, commercial launch expenditures, research and development expenditures, capital expenditures, expansion of business development activities and other general corporate purposes. We may also use a portion of the proceeds for the potential acquisition of businesses, technologies, and products, although we have no current binding understandings, commitments, or agreements to do so.

Based on our current plans, we believe our existing cash, cash equivalents and short-term investments, the Term D Loan in the amount of $30.0 million, which we intend to borrow in late August 2025 before the August 31, 2025 deadline, the receipt of $36.4 million upon the exercise of warrants issued in our 2022 private placement that are likely to be exercised, in the direction of such warrant holders, during the 75 days following the receipt of the Topline Data, the receipt of $50.0 million under the Term E Loan under the A&R Loan Agreement upon the achievement of certain clinical milestones (which may or may not be achieved), together with the net proceeds from this offering, and the net proceeds from the Concurrent Convertible Notes Offering, will be sufficient to fund our operating expenses and capital expenditure requirements into 2027, and which will enable us to, among other things, continue to fund our VIKTORIA-1 Phase 3 trial and VIKTORIA-2 Phase 3 trial, submit a New Drug Application (an "NDA") for gedatolisib, and obtain a decision from the FDA related to such NDA and, if approved, commercially launch. We have based these estimates on assumptions that may prove to be incorrect, including that FDA approval of such NDA occurs without the need for more data than currently anticipated and that the commercial launch of our product candidate occurs on the anticipated timeline. Further, we could use our available capital resources sooner than we currently expect. This estimate does not give effect to any revenue we may generate on commercial sales of any products for which we obtain regulatory approval. In any event, we may require additional funding to be able to continue to advance our research and development pipeline, support our commercialization activities, or conduct additional business development activities. We may satisfy our future cash needs through the sale of equity securities, debt financings, working capital lines of credit, corporate collaborations or license agreements, grant funding, interest income earned on invested cash balances or a combination of one or more of these sources.

As of the date of this prospectus supplement, we cannot specify with certainty all of the particular uses for the net proceeds to us from this offering. Accordingly, we will retain broad discretion over the use of these proceeds. Pending these uses, we intend to invest the net proceeds in investment-grade, interest-bearing securities.

Subject to the above, we may also use a portion of the net proceeds from this offering to acquire, in-license or invest in products, technologies or businesses that are complementary to our business. However, we currently have no agreements or commitments to complete any such transaction.

Pending any ultimate use of any portion of the proceeds from this offering, we intend to invest the proceeds in a variety of capital preservation investments, including short-term, interest-bearing instruments such as U.S. government securities and municipal bonds.

**DILUTION**

If you purchase our common stock or pre-funded warrants in this offering, your interest will be diluted to the extent of the difference between the public offering price per share of common stock or pre-funded warrant and the net tangible book value per share of our common stock after this offering. We calculate net tangible book value per share by dividing our net tangible assets (tangible assets less total liabilities) by the number of shares of our common stock issued and outstanding as of March 31, 2025.

Our net tangible book value at March 31, 2025 was approximately $86.7 million, or $1.99 per share. After giving effect to the offering of (i) 1,836,842 shares of our common stock in this offering at the public offering price of $38.00 per share and (ii) pre-funded warrants to purchase up to 400,000 shares of our common stock in this offering (and assuming the exercise thereof) at a public offering price of $37.999 per pre-funded warrant (which equals the public offering price of the common stock at which shares of our common stock are being sold to the public in this offering less the $0.001 per share exercise price of each such pre-funded warrant), and after deducting the underwriting discounts and commissions and estimated offering expenses payable by us and excluding any resulting accounting associated with the exercise of the pre-funded warrants, our as adjusted net tangible book value as of March 31, 2025 would have been approximately $166.2 million, or $3.63 per share of common stock. This represents an immediate increase in the net tangible book value of $1.64 per share to our existing stockholders and an immediate dilution in net tangible book value of $34.37 per share to new investors. The following table illustrates this per share dilution:

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|:---|:---|:---|
| Public offering price per share |  | $38.00 |
| Net tangible book value per share as of March 31, 2025 | $1.99 |  |
| Increase in net tangible book value per share attributable to this offering | 1.64 |  |
| As adjusted net tangible book value per share as of March 31, 2025, after giving effect to this offering |  | 3.63 |
| Dilution per share to new investors purchasing shares in this offering |  | $34.37 |

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If the underwriters exercise their option to purchase additional shares in full, our as adjusted net tangible book value per share at March 31, 2025, after giving effect to this offering, would have been approximately $3.86 per share, and the dilution to purchasers in this offering would have been approximately $34.14 per share.

The foregoing table and calculations are based on 37,839,392 shares of common stock outstanding as of March 31, 2025, plus 5,747,787 shares of common stock issuable upon the exercise of outstanding pre-funded warrants for nominal consideration, and do not include, as of that date:

● 4,847,454 shares of our common stock issuable upon the exercise of outstanding options at a weighted average exercise price of $10.40 per share;

● 3,175,770 shares of our common stock issuable upon the conversion of 317,577 shares of outstanding Series A Preferred Stock;

● 4,825,502 shares of our common stock issuable upon the exercise of outstanding warrants with a weighted-average exercise price of $8.26 per share;

● 1,554,571 shares of our common stock reserved for issuance under our Amended and Restated 2017 Stock Incentive Plan and our 2017 Employee Stock Purchase Plan;

● 340,103 shares of our common stock issuable upon conversion of certain outstanding Term Loans under our A&R Loan Agreement at a conversion price of $10.00 per share; and

● Any shares issuable upon conversion of the convertible notes.

To the extent that options or warrants as of March 31, 2025 have been or are exercised, or other such securities issued after the date hereof are exercised or other shares are issued, investors purchasing shares in this offering could experience further dilution. In addition, we may choose to raise additional capital due to market conditions or strategic considerations, even if we believe we have sufficient funds for our current or future operating plans. To the extent that additional capital is raised through the sale of equity or convertible debt securities, the issuance of these securities could result in further dilution to our stockholders.

**DESCRIPTION OF PRE-FUNDED WARRANTS**

The following is a brief summary of certain terms and conditions of the pre-funded warrants being offered by this prospectus supplement. The following description is subject in all respects to the provisions contained in the pre-funded warrants.

**Form** 

The pre-funded warrants will be issued as individual warrant agreements to the investors. The form of pre-funded warrant will be filed as an exhibit to our Current Report on Form 8-K that we expect to file with the SEC in connection with this offering.

**Term** 

The pre-funded warrants do not expire.

**Exercisability** 

Subject to certain limitations described below in "—Exercise limitations," the pre-funded warrants are exercisable at any time after their original issuance. The pre-funded warrants will be exercisable, at the option of each holder, in whole or in part by delivering to us a duly executed exercise notice and by payment in full of the exercise price in immediately available funds for the number of shares of common stock purchased upon such exercise. As an alternative to payment in immediately available funds, the holder may elect to exercise the pre-funded warrant through a cashless exercise, in which the holder would receive upon such exercise the net number of shares of common stock determined according to the formula set forth in the pre-funded warrant.

No fractional shares of common stock will be issued in connection with the exercise of a pre-funded warrant. In lieu of any fractional shares that would otherwise be issuable, we will pay in cash to an exercising holder the fair market value, determined according to the terms of the pre-funded warrant, for any such fractional shares.

**Exercise limitations** 

Under the pre-funded warrants, we may not effect the exercise of any portion of any pre-funded warrant, and a holder will not be entitled to exercise any portion of any pre-funded warrant, which, upon giving effect to such exercise, would cause the aggregate number of shares of our common stock beneficially owned by the holder (together with its attribution parties (as defined below)) to exceed 4.99% of the number of shares of our common stock that would be issued and outstanding immediately after giving effect to the exercise. However, any holder may increase or decrease such percentage to any other percentage not in excess of 19.99%, which increase or decrease shall not become effective until 61 days after notice from the holder to us. For purposes of the foregoing, "attribution parties" means, collectively, the following persons and entities with respect to any holder: (i) its direct or indirect affiliates, (ii) any person acting or who could be deemed to be acting as a Section 13(d) "group" together with the holder or any attribution parties and (iii) any other persons whose beneficial ownership of our common stock would or could be aggregated with the holder and/or any other attribution parties for purposes of Section 13(d) or Section 16 of the Exchange Act.

**Exercise price** 

The exercise price per whole share of our common stock purchasable upon the exercise of the pre-funded warrants is $0.001 per share of common stock. The exercise price of the pre-funded warrants and the number of shares of our common stock issuable upon exercise of the pre-funded warrants is subject to appropriate adjustment in the event of certain stock dividends and distributions, stock splits, stock combinations, reclassifications or similar events affecting our common stock.

**Charges, taxes and expenses** 

Issuance and delivery of shares of common stock upon exercise of a pre-funded warrant will be made without charge to the holder thereof for any issue or transfer tax, transfer agent fee or other incidental tax or expense (excluding any applicable stamp duties) in respect of the issuance thereof, all of which taxes and expenses shall be paid by us. However, we are not required to pay any tax that may be payable in respect of any transfer involved in the registration of any warrant shares or pre-funded warrants in a name other than that of the holder or an affiliate thereof. The holder shall be responsible for all other tax liability that may arise as a result of holding or transferring its pre-funded warrants or receiving shares upon exercise thereof.

**Transferability** 

Subject to applicable laws, the pre-funded warrants may be assigned by the holder without our consent. The ownership of the pre-funded warrants and any transfers of the pre-funded warrants will be registered in a warrant register maintained by the warrant agent. We will initially act as warrant agent.

**Exchange listing** 

We do not plan on applying to list the pre-funded warrants on The Nasdaq Capital Market or any other national securities exchange or nationally recognized trading system.

**Fundamental transactions** 

In the event of a "fundamental transaction" (as described in the pre-funded warrants and generally including but not limited to [certain reclassifications of our common stock, the sale, transfer or other disposition of all or substantially all of our properties or assets, our consolidation or merger with or into another person, the tender and acceptance for payment of shares representing more than 50% of the voting power of our capital stock pursuant to any tender or exchange offer (whether by us or another person), and the acquisition by another person of more than 50% of the voting power of our capital stock pursuant to a stock purchase agreement or other business combination, including a reorganization, recapitalization or spin-off (except for any such transaction in which our stockholders immediately prior to such transaction maintain, in substantially the same proportions, voting power of us immediately after the transaction)), upon consummation of such a fundamental transaction, the holders of the pre-funded warrants will be entitled to receive upon exercise of the pre-funded warrants the kind and amount of securities, cash or other property that the holders would have received had they exercised the pre-funded warrants in full immediately prior to such fundamental transaction without regard to any limitations on exercise contained in the pre-funded warrants.

**No rights as a stockholder** 

Except by virtue of such holder's ownership of shares of our common stock, the holder of a pre-funded warrant does not have the rights or privileges of a holder of our common stock, including any voting rights, until the holder exercises the pre-funded warrant. In the event of certain distributions, including cash dividends, if any, to all holders of our common stock for no consideration, the holder of a pre-funded warrant shall be entitled to participate in such distributions to the same extent as if such holder held the number of shares of our common stock acquirable upon complete exercise of its pre-funded warrant (without regard to any limitations on exercise). If such distribution would result in such holder and the other attribution parties exceeding the exercise limitations described above, a portion of such distribution shall be held in abeyance for the benefit of such holder until such time as the ownership limitations would not be exceeded.

**DESCRIPTION OF THE CONCURRENT CONVERTIBLE NOTES OFFERING**

Concurrently with this offering, we are offering $175,000,000 aggregate principal amount of our 2.750% Convertible Senior Notes due 2031 (or up to $201,250,000 aggregate principal amount if the underwriters in the Concurrent Convertible Notes Offering exercise their over-allotment option in full) pursuant to a separate prospectus supplement in an underwritten public offering. The convertible notes will mature on August 1, 2031, unless earlier converted, redeemed or repurchased by us. The convertible notes will bear interest at a rate of 2.750% per year, payable semi-annually in arrears on February 1 and August 1 of each year, beginning on February 1, 2026. Noteholders may convert their convertible notes at their option at any time prior to the close of business on the scheduled trading day immediately preceding the maturity date. We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, based on the applicable conversion rate(s). Notwithstanding the foregoing, we will elect to irrevocably fix the settlement method to physical settlement in the indenture governing the convertible notes. As a result, we will satisfy our conversion obligation by delivering shares of our common stock, together with cash in lieu of fractional shares, if applicable. The initial conversion rate is 19.4932 shares of common stock per $1,000 principal amount of convertible notes, which represents an initial conversion price of approximately $51.30 per share, and is subject to adjustment as described in this prospectus supplement. If a "make-whole fundamental change" (as defined in the indenture governing the convertible notes) occurs, then we will in certain circumstances increase the conversion rate for a specified period of time.

The convertible notes will be redeemable, in whole or in part (subject to certain limitations described in this prospectus supplement), at our option at any time, and from time to time, on or after August 6, 2029 and on or before the 51st scheduled trading day immediately before the maturity date, at a cash redemption price equal to the principal amount of the convertible notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of our common stock exceeds 130% of the conversion price on (1) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date we send the related redemption notice; and (2) the trading day immediately before the date we send such notice. In addition, calling any convertible note for redemption will constitute a make-whole fundamental change with respect to that convertible note, in which case the conversion rate applicable to the conversion of that convertible note will be increased in certain circumstances if it is converted after it is called for redemption.

If a "fundamental change" (as defined in the indenture governing the convertible notes) occurs, then, subject to a limited exception, noteholders may require us to repurchase their convertible notes at a cash repurchase price equal to the principal amount of the convertible notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date.

The convertible notes will be our senior, unsecured obligations and will be equal in right of payment with our existing and future senior, unsecured indebtedness, senior in right of payment to our existing and future indebtedness that is expressly subordinated to the convertible notes and effectively subordinated to our existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness, including any borrowings under the Term Loans.

The closing of this offering is not conditioned upon the closing of the Concurrent Convertible Notes Offering, and the closing of the Concurrent Convertible Notes Offering is not conditioned upon the closing of this offering. We cannot assure you that the Concurrent Convertible Notes Offering will be completed or, if completed, on what terms it will be completed. The Concurrent Convertible Notes Offering is being made pursuant to a separate prospectus supplement, and nothing contained herein shall constitute an offer to sell or the solicitation of an offer to buy the convertible notes to be issued in the Concurrent Convertible Notes Offering.

See "Use of Proceeds" for additional information regarding the use of proceeds from the Concurrent Convertible Notes Offering.

**MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. HOLDERS**

The following is a summary of the material U.S. federal income tax consequences to non-U.S. holders (as defined below) of the ownership and disposition of our common stock or pre-funded warrants issued pursuant to this offering, but does not purport to be a complete analysis of all potential U.S. federal income or other tax effects. The effects of other U.S. federal tax laws, such as estate and gift tax laws, and any applicable state, local or non-U.S. tax laws are not discussed. This summary is based upon provisions of the U.S. Internal Revenue Code of 1986, as amended (the "Code"), Treasury Regulations promulgated thereunder, judicial decisions, and published rulings and administrative pronouncements of the U.S. Internal Revenue Service (the "IRS"), in each case in effect as of the date hereof. These authorities may change or be subject to differing interpretations so as to result in U.S. federal income tax consequences different from those discussed below, including in a manner that may adversely affect a non-U.S. holder. Any such change or differing interpretation may be applied retroactively. We have not sought and will not seek any rulings from the IRS regarding the matters discussed below. There can be no assurance the IRS or a court will not take a contrary position to that discussed below regarding the tax consequences of the ownership or disposition of our common stock or pre-funded warrants.

This summary addresses only common stock or pre-funded warrants held as "capital assets" within the meaning of Section 1221 of the Code (generally, property held for investment) by a non-U.S. holder who purchased common or pre-funded warrants stock pursuant to this offering. This summary does not address all aspects of U.S. federal income taxes that may be relevant to non-U.S. holders (including any alternative minimum tax, the potential application of the Medicare contribution tax on net investment income and the special tax accounting rules under Section 451(b) of the Code), nor does it address all tax consequences that may be relevant to a non-U.S. holder's personal circumstances or particular situation, or the tax consequences applicable to non-U.S. holders subject to special rules, such as:

● brokers, dealers or traders in securities;

● banks, insurance companies or other financial institutions;

● regulated investment companies or real estate investment trusts;

● tax-exempt entities or governmental organizations;

● tax-qualified retirement plans;

● "controlled foreign corporations," "passive foreign investment companies," or corporations that accumulate earnings to avoid U.S. federal income tax;

● "qualified foreign pension funds" as defined in Section 897(l)(2) of the Code and entities all of the interests of which are held by qualified foreign pension funds;

● persons holding shares of our common stock or pre-funded warrants as a part of an integrated or conversion transaction or as part of a hedge, straddle, or other risk reduction strategy;

● persons deemed to sell our common stock or pre-funded warrants under the constructive sale provisions of the Code;

● partnerships, S corporations or other pass-through entities or arrangements or investors in such entities or arrangements;

● persons holding (actually or constructively) more than 5% of our common stock and pre-funded warrants;

● persons who hold our common stock or pre-funded warrants pursuant to the exercise of an employee stock option or otherwise as compensation;

● persons that participate in the Concurrent Convertible Notes Offering; and

● U.S. expatriates and former citizens or long-term residents of the United States.

If an entity or arrangement, domestic or foreign, treated as a partnership for U.S. federal income tax purposes holds our common stock or pre-funded warrants, the tax treatment of a partner in the partnership will depend on the status of the partner, the activities of the partnership and certain determinations made at the partner level. Accordingly, partnerships holding our common stock or pre-funded warrants and the partners in such partnerships should consult their tax advisors.

**THIS DISCUSSION IS FOR INFORMATIONAL PURPOSES ONLY AND IS NOT TAX ADVICE. YOU SHOULD CONSULT YOUR TAX ADVISOR WITH RESPECT TO THE APPLICATION OF THE U.S. FEDERAL INCOME TAX LAWS TO YOUR PARTICULAR SITUATION AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR COMMON STOCK OR PRE-FUNDED WARRANTS UNDER OTHER U.S. FEDERAL TAX LAWS (INCLUDING ESTATE AND GIFT TAX LAWS), UNDER THE LAWS OF ANY STATE, LOCAL OR NON-U.S. TAXING JURISDICTION OR UNDER ANY APPLICABLE TAX TREATY.**

As used herein, a "non-U.S. holder" is any beneficial owner of our common stock or pre-funded warrants that is neither a "U.S. person" (as defined below) nor an entity or arrangement treated as a partnership for U.S. federal income tax purposes. A "U.S. person" is any person that, for U.S. federal income tax purposes, is or is treated as any of the following:

● an individual who is a citizen or resident of the United States;

● a corporation (or any other entity treated as a corporation for U.S. federal income tax purposes) created or organized in or under the laws of the United States, any state thereof or the District of Columbia;

● an estate the income of which is subject to U.S. federal income taxation regardless of its source; or

● a trust, if it (i) is subject to the primary supervision of a court within the United States and one or more "United States persons" (within the meaning of Section 7701(a)(30) of the Code) have the authority to control all substantial decisions of the trust, or (ii) has a valid election in effect to be treated as a United States person.

***Pre-Funded Warrants***

Although it is not entirely free from doubt, a pre-funded warrant should be treated as a share of our common stock for U.S. federal income tax purposes and a holder of a pre-funded warrant should generally be taxed in the same manner as a holder of such common stock, as described below. Accordingly, no gain or loss should be recognized (other than with respect to any cash paid in lieu of a fractional share) upon the exercise of a pre-funded warrant and, upon exercise, the holding period of a pre-funded warrant should carry over to the share of common stock received. Similarly, the tax basis of a pre-funded warrant should carry over to the share of common stock received upon exercise, increased by the exercise price per share of common stock (if applicable).

Our characterization is not binding on the IRS, and the IRS may treat our pre-funded warrants as warrants to acquire our common stock. In that case, the amount and character of a non-U.S. holder's gain or loss with respect to an investment in our pre-funded warrants could be materially different from the discussion set forth below. Accordingly, each holder of pre-funded warrants should consult his, her or its own tax advisor regarding the risks associated with the acquisition of pre-funded warrants pursuant to this offering (including potential alternative characterizations). The remainder of this discussion assumes that a pre-funded warrant is treated as a share of our common stock for U.S. federal income tax purposes.

***Distributions on our Common Stock or Pre-Funded Warrants***

Distributions, if any, of cash or property on our common stock or pre-funded warrants, other than certain *pro rata* distributions of common stock or rights to acquire common stock, generally will constitute dividends for U.S. federal income tax purposes to the extent paid from our current or accumulated earnings and profits, as determined under U.S. federal income tax principles. Distributions in excess of our current and accumulated earnings and profits will be applied against and reduce the non-U.S. holder's adjusted tax basis in our common stock or pre-funded warrants (but not below zero) as a tax-free return of capital and, to the extent in excess of such adjusted tax basis, will be treated as capital gain from the sale or exchange of such common stock or pre-funded warrants and taxed as described below in "— *Sale, Exchange, or Other Taxable Dispositions of our Common Stock or Pre-Funded Warrants."*

Any amount treated for U.S. federal income tax purposes as a dividend paid to a non-U.S. holder generally will be subject to U.S. federal withholding tax at a 30% rate or such lower rate as may be specified by an applicable income tax treaty. However, amounts treated as dividends that are effectively connected with the non-U.S. holder's conduct of a trade or business in the United States and, if required by an applicable income tax treaty, are attributable to a U.S. permanent establishment or fixed place of business, are not subject to the withholding tax, but instead are subject to U.S. federal income tax on a net income basis at applicable individual or corporate rates. Certain certification and disclosure requirements must be complied with in order for effectively connected income to be exempt from withholding. Any such effectively connected income received by a foreign corporation may, under certain circumstances, be subject to a branch profits tax at a 30% rate or such lower rate as may be specified by an applicable income tax treaty.

If dividends paid to a non-U.S. Holder are effectively connected with the non-U.S. Holder's conduct of a trade or business within the United States (and, if required by an applicable income tax treaty, the non-U.S. Holder maintains a permanent establishment in the United States to which such dividends are attributable), the non-U.S. Holder will be exempt from the U.S. federal withholding tax described above. To claim the exemption, the non-U.S. Holder must furnish to the applicable withholding agent a valid IRS Form W-8ECI, certifying that the dividends are effectively connected with the non-U.S. Holder's conduct of a trade or business within the United States.

A non-U.S. holder that wishes to claim the benefit of an applicable income tax treaty rate is required to satisfy applicable certification and other requirements. If a non-U.S. holder is eligible for an exemption from or a reduced rate of U.S. federal withholding tax pursuant to an income tax treaty, it may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for refund with the IRS.

**Constructive Distributions on Pre-Funded Warrants**

A non-U.S. holder of pre-funded warrants may, in certain circumstances, be deemed to have received a distribution subject to U.S. federal income tax as a result of an adjustment or the non-occurrence of an adjustment to the exercise price or number of shares of common stock issuable upon exercise of such pre-funded warrants. Any such deemed distribution would be taxable as a dividend, return of capital or capital gain as described above under "—Distributions on our Common Stock or Pre-Funded Warrants." Any resulting withholding tax attributable to deemed dividends may be collected from other amounts payable or distributable to, or other assets of, the non-U.S. holder. Non-U.S. holders should consult their tax advisors regarding the proper treatment of any adjustments or the non-occurrence of any adjustment to the pre-funded warrants.

Prospective investors in the pre-funded warrants should consult their tax advisors regarding the U.S. federal income and other tax consequences to them of the ownership and disposition of the pre-funded warrants offered by this Prospectus Supplement.

***Sale, Exchange, or Other Taxable Dispositions of our Common Stock or Pre-Funded Warrants***

Subject to the discussion below under "— *Information Reporting and Backup Withholding*," any gain recognized by a non-U.S. holder on the sale or other taxable disposition of our common stock or pre-funded warrants will not be subject to U.S. federal income tax unless:

● that gain is effectively connected with the non-U.S. holder's conduct of a trade or business in the United States (and, if required by an applicable income tax treaty, is attributable to a U.S. permanent establishment or fixed place of business);

● the non-U.S. holder is an individual who is present in the United States for 183 days or more in the taxable year of disposition and certain other conditions are met; or

● we are or have been a "United States real property holding corporation," or USRPHC, for U.S. federal income tax purposes at any time during the shorter of the non-U.S. holder's holding period or the five-year period ending on the date of disposition of the common stock or pre-funded warrants and certain other conditions are met.

If a non-U.S. holder's gain is described in the first bullet point above, the non-U.S. holder will be subject to tax at regular graduated U.S. federal income tax rates on the net gain derived from the sale or other taxable disposition of our common stock or pre-funded warrants, generally in the same manner as if the non-U.S. holder were a U.S. person, and, if the non-U.S. holder is a foreign corporation, the non-U.S. holder additionally may be subject to a branch profits tax equal to 30% of the non-U.S. holder's effectively connected earnings and profits, or at such lower rate as may be specified by an applicable income tax treaty.

If a non-U.S. holder's gain is described in the second bullet point above, the non-U.S. holder will be subject to a flat 30% tax (or lower applicable income tax treaty rate) on the gain recognized on the sale or other taxable disposition of our common stock or pre-funded warrants (which gain may be offset by certain U.S.-source capital losses), even though the non-U.S. holder is not considered a resident of the United States.

With respect to the third bullet point above, we believe we currently are not, and do not anticipate becoming, a USRPHC. Because the determination of whether we are a USRPHC depends, on the fair market value of our U.S. real property interests relative to the fair market value of our non-U.S. real property interests and other business assets, however, there can be no assurance we currently are not a USRPHC or will not become one in the future.

Non-U.S. Holders should consult their tax advisors regarding potentially applicable income tax treaties that may provide for different rules.

***Information Reporting and Backup Withholding***

Generally, the amount of distributions on our common stock or pre-funded warrants to non-U.S. holders, as well as the amount of tax, if any, withheld with respect to those payments, must be reported annually to the IRS and to the non-U.S. holders. Copies of the information returns reporting such distributions and withholding may also be made available to the tax authorities in the country in which the non-U.S. holder resides under the provisions of an applicable income tax treaty. In general, a non-U.S. holder will not be subject to backup withholding with respect to payments of dividends on our common stock or pre-funded warrants, provided the non-U.S. holder certifies its non-U.S. status on a validly executed IRS Form W-8BEN, IRS Form W-8BEN-E or other applicable IRS Form W-8 (and the applicable payor does not have actual knowledge or reason to know that the non-U.S. holder is a U.S. person, as defined under the Code, that is not an exempt recipient). In addition, a non-U.S. holder will be subject to information reporting and, depending on the circumstances, backup withholding with respect to payments of the proceeds of the sale or other taxable disposition of our common stock or pre-funded warrants conducted within the United States or through certain U.S.-related financial intermediaries, unless the certification described above has been received, or the non-U.S. holder otherwise establishes an exemption. Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules will be allowed as a refund or a credit against a non-U.S. holder's U.S. federal income tax liability, if any, provided the required information is timely furnished to the IRS.

***Foreign Account Tax Compliance Act***

Sections 1471 through 1474 of the Code and the Treasury Regulations promulgated thereunder (commonly referred to as "FATCA") generally impose a withholding tax at a rate of 30% on certain types of "withholdable payments" (as specifically defined for purposes of FATCA) paid to (i) a "foreign financial institution" (as specifically defined for purposes of FATCA), or FFI, whether as a beneficial owner or intermediary, unless such institution enters into an agreement with the U.S. government to collect and provide to the U.S. tax authorities substantial information regarding U.S. account holders of such institution (which would include certain equity and debt holders of such institution, as well as certain account holders that are foreign entities with U.S. owners), or qualifies for an exemption from these rules, and (ii) a foreign entity that is not a financial institution (whether as a beneficial owner or intermediary for another foreign entity that is not a financial institution) unless such entity provides the withholding agent or U.S. tax authorities with a certification identifying the substantial U.S. owners of the entity, which generally include any U.S. person who directly or indirectly owns more than 10% of the entity, or qualifies for an exemption from these rules. A person that receives payments through one or more FFIs may receive reduced payments as a result of FATCA withholding taxes if (x) any such FFI does not enter into such an agreement with the U.S. government and does not otherwise establish an exemption, or (y) such person is (a) a "recalcitrant account holder" or (b) itself an FFI that fails to enter into such an agreement or establish an exemption. FFIs located in jurisdictions that have an intergovernmental agreement with the United States governing FATCA may be subject to different rules.

The applicable Treasury Regulations and administrative guidance currently provide that the FATCA withholding rules will apply to payments of dividends on our common stock or pre-funded warrants regardless of when they are made. If a dividend payment is both subject to withholding under FATCA and subject to the withholding tax discussed above under "—Distributions on our Common Stock or Pre-Funded Warrants," the withholding under FATCA may be credited against, and therefore reduce, such other withholding tax. While the Code provides that withholding under FATCA generally also will apply to payments of gross proceeds from the sale or other disposition of our common stock or pre-funded warrants, proposed Treasury Regulations have been released that, if finalized in their present form, would eliminate FATCA withholding on payments of gross proceeds entirely. The preamble to the proposed Treasury Regulations states that taxpayers generally may rely on them until final Treasury Regulations are issued. Non-U.S. holders are encouraged to consult their tax advisors regarding the implications of these rules on their investment in our common stock or pre-funded warrants.

**UNDERWRITING**

Subject to the terms and conditions set forth in the underwriting agreement, dated July 30, 2025, among us and Jefferies LLC, TD Securities (USA) LLC and Leerink Partners LLC, as the representatives of the underwriters named below and the joint book-running managers of this offering, we have agreed to sell to the underwriters, and each of the underwriters has agreed, severally and not jointly, to purchase from us, the respective number of shares of common stock and pre-funded warrants shown opposite its name below:

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| | | |
|:---|:---|:---|
| **Underwriter** | **Number of Shares** | **Number of <br> Pre-Funded Warrants** |
| Jefferies LLC | 661263 | 144000 |
| TD Securities (USA) LLC | 523500 | 114000 |
| Leerink Partners LLC | 523500 | 114000 |
| LifeSci Capital LLC | 128579 | 28000 |
| &nbsp;&nbsp;&nbsp;Total | 1836842 | 400000 |

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The underwriting agreement provides that the obligations of the several underwriters are subject to certain conditions precedent such as the receipt by the underwriters of officers' certificates and legal opinions and approval of certain legal matters by their counsel. The underwriting agreement provides that the underwriters will purchase all of the shares of common stock and pre-funded warrants if any of them are purchased. If an underwriter defaults, the underwriting agreement provides that the purchase commitments of the non-defaulting underwriters may be increased or the underwriting agreement may be terminated. We have agreed to indemnify the underwriters and certain of their controlling persons against certain liabilities, including liabilities under the Securities Act, and to contribute to payments that the underwriters may be required to make in respect of those liabilities.

The underwriters have advised us that, following the completion of this offering, they currently intend to make a market in the common stock as permitted by applicable laws and regulations. However, the underwriters are not obligated to do so, and the underwriters may discontinue any market-making activities at any time without notice in their sole discretion. Accordingly, no assurance can be given as to the liquidity of the trading market for the common stock and pre-funded warrants, that you will be able to sell any of the common stock and pre-funded warrants held by you at a particular time or that the prices that you receive when you sell will be favorable.

The underwriters are offering the shares of common stock and pre-funded warrants subject to their acceptance of the shares of common stock and pre-funded warrants from us and subject to prior sale. The underwriters reserve the right to withdraw, cancel or modify offers to the public and to reject orders in whole or in part.

**Option to Purchase Additional Shares**

We have granted to the underwriters an option, exercisable for 30 days from the date of this prospectus, to purchase, from time to time, in whole or in part, up to an aggregate of 335,526 shares from us at the public offering price set forth on the cover page of this prospectus, less underwriting discounts and commissions. If the underwriters exercise this option, each underwriter will be obligated, subject to specified conditions, to purchase a number of additional shares proportionate to that underwriter's initial purchase commitment as indicated in the table above.

**Commission and Expenses**

The underwriters have advised us that they propose to offer the shares of common stock and pre-funded warrants to the public at the initial public offering price set forth on the cover page of this prospectus and to certain dealers, which may include the underwriters, at that price less a concession not in excess of $1.3680 per share of common stock. After the offering, the public offering price, concession and reallowance to dealers may be reduced by the representatives. No such reduction will change the amount of proceeds to be received by us as set forth on the cover page of this prospectus.

The following table shows the public offering price, the underwriting discounts and commissions that we are to pay the underwriters and the proceeds, before expenses, to us in connection with this offering. Such amounts are shown assuming both no exercise and full exercise of the underwriters' option to purchase additional shares.

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
|  | **Per Share** | **Per Share** | | **Total** | **Total** |
|  | **Without Option to Purchase Additional Shares** | **With Option to Purchase Additional Shares** |<br>**Per Pre-Funded Warrant** | **Without Option to Purchase Additional Shares** | **With Option to Purchase Additional Shares** |
| Public offering price | $38.000 | $38.000 | $37.999 | $84999596.000 | $97749584.000 |
| Underwriting discounts and commissions paid by us | $2.280 | $2.280 | $2.280 | $5099999.760 | $5864999.040 |
| Proceeds to us, before expenses | $35.720 | $35.720 | $35.719 | $79899596.240 | $91884584.960 |

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We estimate expenses payable by us in connection with this offering, other than the underwriting discounts and commissions referred to above, will be approximately $327,000. We have also agreed to reimburse the underwriters for up to $7,500 for their Financial Industry Regulatory Authority, Inc. ("FINRA") counsel fee. In accordance with FINRA Rule 5110, this reimbursed fee is deemed underwriting compensation for this offering.

**Listing**

Our common stock is listed on is listed on the Nasdaq Capital Market under the symbol "CELC."

There is no established public trading market for the pre-funded warrants, and we do not expect a market to develop. We do not intend to list the pre-funded warrants on any national securities exchange or nationally recognized trading system.

**No Sales of Similar Securities**

We, our executive officers, directors and certain holders of our outstanding capital stock have agreed for the 60 days after the date of this prospectus without the prior written consent of the representatives and subject to specified exceptions, not to directly or indirectly:

● sell, offer, contract or grant any option to sell (including any short sale), pledge, hypothecate or grant any securities interest in, transfer or dispose of any shares of common stock or related securities (as defined in the lock-up agreement) currently owned either of record or beneficially (as defined in Rule 13d-3 under the Exchange Act of 1934, as amended (the "Exchange Act")) after the date of this prospectus;

● effect any short sale, or establish or increase any "put equivalent position" (as defined in Rule 16a-l(h) under the Exchange Act) or liquidate or decrease any "call equivalent position" (as defined in Rule 16a-1(h) under the Exchange Act);

● Enter into any swap, hedge or similar arrangement or agreement that transfers, in whole or in part, the economic risk of ownership of any shares of common stock or related securities, regardless of whether any such transaction is to be settled in securities, in cash or otherwise;

● make any demand for, or exercise any right with respect to, the registration under the Securities Act of the offer and sale of any shares of common stock or related securities, or cause to be filed a registration statement, prospectus or prospectus supplement (or an amendment or supplement thereto) with respect to any such registration;

● effect a reverse stock split, recapitalization, share consolidation, reclassification or similar transaction affecting our outstanding shares of common stock; or

● publicly announce an intention to do any of the foregoing.

This restriction terminates after the close of trading of the common stock on and including the 60<sup>th</sup> day after the date of this prospectus.

The representatives may, in their sole discretion and at any time or from time to time before the termination of the 60-day period release all or any portion of the securities subject to lock-up agreements. Except for customary lock-up exceptions, including with respect to our Open Market Sale Agreement<sup>SM</sup> with Jefferies LLC, and the convertible notes to be issued and sold pursuant to the Concurrent Convertible Notes Offering and any shares of common stock issued upon conversion of the convertible notes, there are no existing agreements between the underwriters and any of our shareholders who will execute a lock-up agreement, providing consent to the sale of shares prior to the expiration of the lock-up period.

**Stabilization**

The underwriters have advised us that they, pursuant to Regulation M under the Exchange Act, certain persons participating in the offering may engage in short sale transactions, stabilizing transactions, syndicate covering transactions or the imposition of penalty bids in connection with this offering. These activities may have the effect of stabilizing or maintaining the market price of the common stock at a level above that which might otherwise prevail in the open market. Establishing short sales positions may involve either "covered" short sales or "naked" short sales.

"Covered" short sales are sales made in an amount not greater than the underwriters' option to purchase additional shares of our common stock in this offering. The underwriters may close out any covered short position by either exercising their option to purchase additional shares of our common stock or purchasing shares of our common stock in the open market. In determining the source of shares to close out the covered short position, the underwriters will consider, among other things, the price of shares available for purchase in the open market as compared to the price at which they may purchase shares through the option to purchase additional shares.

"Naked" short sales are sales in excess of the option to purchase additional shares of our common stock. The underwriters must close out any naked short position by purchasing shares in the open market. A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the shares of our common stock in the open market after pricing that could adversely affect investors who purchase in this offering.

A stabilizing bid is a bid for the purchase of shares of common stock on behalf of the underwriters for the purpose of fixing or maintaining the price of the common stock. A syndicate covering transaction is the bid for or the purchase of shares of common stock on behalf of the underwriters to reduce a short position incurred by the underwriters in connection with the offering. Similar to other purchase transactions, the underwriter's purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our common stock or preventing or retarding a decline in the market price of our common stock. As a result, the price of our common stock may be higher than the price that might otherwise exist in the open market. A penalty bid is an arrangement permitting the underwriters to reclaim the selling concession otherwise accruing to a syndicate member in connection with the offering if the common stock originally sold by such syndicate member are purchased in a syndicate covering transaction and therefore have not been effectively placed by such syndicate member.

Neither we, nor any of the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our common stock. The underwriters are not obligated to engage in these activities and, if commenced, any of the activities may be discontinued at any time.

The underwriters may also engage in passive market making transactions in our common stock on The Nasdaq Capital Market in accordance with Rule 103 of Regulation M during a period before the commencement of offers or sales of shares of our common stock in this offering and extending through the completion of distribution. A passive market maker must display its bid at a price not in excess of the highest independent bid of that security. However, if all independent bids are lowered below the passive market maker's bid, that bid must then be lowered when specified purchase limits are exceeded.

 

 

**Electronic Distribution**

A prospectus in electronic format may be made available by e-mail or on the web sites or through online services maintained by one or more of the underwriters or their affiliates. In those cases, prospective investors may view offering terms online and may be allowed to place orders online. The underwriters may agree with us to allocate a specific number of shares of common stock and pre-funded warrants for sale to online brokerage account holders. Any such allocation for online distributions will be made by the underwriters on the same basis as other allocations. Other than the prospectus in electronic format, the information on the underwriters' web sites and any information contained in any other web site maintained by any of the underwriters is not part of this prospectus, has not been approved and/or endorsed by us or the underwriters and should not be relied upon by investors.

**Other Activities and Relationships** 

The underwriters and certain of their affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, investment management, investment research, principal investment, hedging, financing and brokerage activities. The underwriters and certain of their affiliates have, from time to time, performed, and may in the future perform, various commercial and investment banking and financial advisory services for us and our affiliates, for which they received or will receive customary fees and expenses. For example, on February 4, 2022 we entered into an Open Market Sale Agreement<sup>SM</sup> with Jefferies LLC pursuant to which we may offer and sell shares of our common stock from time to time through Jefferies LLC acting as our sales agent.

In the ordinary course of their various business activities, the underwriters and certain of their affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own accounts and for the accounts of their customers, and such investment and securities activities may involve securities and/or instruments issued by us and our affiliates. If the underwriters or their respective affiliates have a lending relationship with us, they routinely hedge their credit exposure to us consistent with their customary risk management policies. The underwriters and their respective affiliates may hedge such exposure by entering into transactions which consist of either the purchase of credit default swaps or the creation of short positions in our securities or the securities of our affiliates, including potentially the common stock offered hereby. Any such short positions could adversely affect future trading prices of the common stock offered hereby. The underwriters and certain of their respective affiliates may also communicate independent investment recommendations, market color or trading ideas and/or publish or express independent research views in respect of such securities or instruments and may at any time hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

**Concurrent Convertible Notes Offering**

Concurrently with this offering, we are conducting a public offering of $175,000,000 aggregate principal amount of the convertible notes (or up to $201,250,000 aggregate principal amount if the underwriters in the Concurrent Convertible Notes Offering exercise in full their over-allotment option). Neither this offering nor the Concurrent Convertible Notes Offering is conditioned upon the completion of the other, so it is possible that this offering occurs and the Concurrent Convertible Notes Offering does not occur, or vice versa. We cannot assure you that the Concurrent Convertible Notes Offering will be completed on the terms described herein, on significantly different terms or at all. The Concurrent Convertible Notes Offering is being made pursuant to a separate prospectus supplement and nothing contained herein shall constitute an offer to sell or the solicitation of an offer to buy the convertible notes to be issued in the Concurrent Convertible Notes Offering.

**Disclaimers About Non-U.S. Jurisdictions**

***Australia***

This prospectus supplement is not a disclosure document for the purposes of Australia's Corporations Act 2001 (Cth) of Australia, or Corporations Act, has not been lodged with the Australian Securities & Investments Commission and is only directed to the categories of exempt persons set out below. Accordingly, if you receive this prospectus supplement in Australia:

You confirm and warrant that you are either:

a) a "sophisticated investor" under section 708(8)(a)
or (b) of the Corporations Act;

b) a "sophisticated investor" under section 708(8)(c)
or (d) of the Corporations Act and that you have provided an accountant's certificate to the Company which complies with the requirements
of section 708(8)(c)(i) or (ii) of the Corporations Act and related regulations before the offer has been made;

c) a person associated with the Company under Section 708(12)
of the Corporations Act; or

d) a "professional investor" within the meaning of
section 708(11)(a) or (b) of the Corporations Act.

To the extent that you are unable to confirm or warrant that you are an exempt sophisticated investor, associated person or professional investor under the Corporations Act any offer made to you under this prospectus supplement is void and incapable of acceptance.

You warrant and agree that you will not offer any securities issued to you pursuant to this prospectus supplement for resale in Australia within 12 months of the securities being issued unless any such resale offer is exempt from the requirement to issue a disclosure document under section 708 of the Corporations Act.

***European Economic Area***

In relation to each Member State of the European Economic Area (each, a "Relevant State"), no securities have been offered or will be offered pursuant to the offering to the public in that Relevant State prior to the publication of a prospectus in relation to the shares which have been approved by the competent authority in that Relevant State or, where appropriate, approved in another Relevant State and notified to the competent authority in that Relevant State, all in accordance with the Prospectus Regulation, except that the shares may be offered to the public in that Relevant State at any time:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) to any legal entity which is a "qualified investor" as defined under Article 2 of the Prospectus Regulation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) to fewer than 150 natural or legal persons (other than qualified investors as defined under Article 2 of the Prospectus Regulation), subject to obtaining the prior consent of the representatives for any such offer; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) in any other circumstances falling within Article 1(4) of the Prospectus Regulation,

provided that no such offer of the securities shall require us or the representatives to publish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus pursuant to Article 23 of the Prospectus Regulation.

For the purposes of this provision, the expression "offer to the public" in relation to the securities in any Relevant State means the communication in any form and by any means of sufficient information on the terms of the offer and any securities to be offered so as to enable an investor to decide to purchase or subscribe for any securities, and the expression "Prospectus Regulation" means Regulation (EU) 2017/1129.

***United Kingdom***

No securities have been offered or will be offered pursuant to the offering to the public in the United Kingdom prior to the publication of a prospectus in relation to the securities which has been approved by the Financial Conduct Authority, except that the securities may be offered to the public in the United Kingdom at any time:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) to any legal entity which is a qualified investor as defined under Article 2 of the UK Prospectus Regulation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) to fewer than 150 natural or legal persons (other than qualified investors as defined under Article 2 of the UK Prospectus Regulation), subject to obtaining the prior consent of the representatives for any such offer; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) in any other circumstances falling within Section 86 of the FSMA,

provided that no such offer of the securities shall require the Issuer or any Manager to publish a prospectus pursuant to Section 85 of the FSMA or supplement a prospectus pursuant to Article 23 of the UK Prospectus Regulation. For the purposes of this provision, the expression an "offer to the public" in relation to the securities in the United Kingdom means the communication in any form and by any means of sufficient information on the terms of the offer and any shares to be offered so as to enable an investor to decide to purchase or subscribe for any securities and the expression "UK Prospectus Regulation" means Regulation (EU) 2017/1129 as it forms part of domestic law by virtue of the European Union (Withdrawal) Act 2018.

***Canada***

*Resale Restrictions* 

The distribution of securities in Canada is being made only in the provinces of Ontario, Quebec, Alberta and British Columbia on a private placement basis exempt from the requirement that we prepare and file a prospectus with the securities regulatory authorities in each province where trades of these securities are made. Any resale of the securities in Canada must be made under applicable securities laws which may vary depending on the relevant jurisdiction, and which may require resales to be made under available statutory exemptions or under a discretionary exemption granted by the applicable Canadian securities regulatory authority. Purchasers are advised to seek legal advice prior to any resale of the securities.

*Representations of Canadian Purchasers* 

By purchasing the securities in Canada and accepting delivery of a purchase confirmation, a purchaser is representing to us and the dealer from whom the purchase confirmation is received that:

● the purchaser is entitled under applicable provincial securities laws to purchase the securities without the benefit of a prospectus qualified under those securities laws as it is an "accredited investor" as defined under National Instrument 45-106 – *Prospectus Exemptions*,

● the purchaser is a "permitted client" as defined in National Instrument 31-103 - *Registration Requirements, Exemptions and Ongoing Registrant Obligations*,

● where required by law, the purchaser is purchasing as principal and not as agent, and

● the purchaser has reviewed the text above under Resale Restrictions.

*Conflicts of Interest* 

Canadian purchasers are hereby notified that the underwriters are relying on the exemption set out in section 3A.3 or 3A.4, if applicable, of National Instrument 33-105 – *Underwriting Conflicts* from having to provide certain conflict of interest disclosure in this document.

*Statutory Rights of Action* 

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if the offering memorandum (including any amendment thereto) such as this document contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser's province or territory. The purchaser of these securities in Canada should refer to any applicable provisions of the securities legislation of the purchaser's province or territory for particulars of these rights or consult with a legal advisor.

*Enforcement of Legal Rights* 

All of our directors and officers as well as the experts named herein may be located outside of Canada and, as a result, it may not be possible for Canadian purchasers to effect service of process within Canada upon us or those persons. All or a substantial portion of our assets and the assets of those persons may be located outside of Canada and, as a result, it may not be possible to satisfy a judgment against us or those persons in Canada or to enforce a judgment obtained in Canadian courts against us or those persons outside of Canada.

*Taxation and Eligibility for Investment* 

Canadian purchasers of securities should consult their own legal and tax advisors with respect to the tax consequences of an investment in the securities in their particular circumstances and about the eligibility of the securities for investment by the purchaser under relevant Canadian legislation.

*Language of Documents* 

The purchaser confirms its express wish and that it has requested that this document, all documents evidencing or relating to the sale of the securities described herein and all other related documents be drawn up exclusively in the English language. *L'acquéreur confirme sa volonté expresse et qu'il a demandé que le présent document, tous les documents attestant de la vente des titres décrits dans le présent document ou s'y rapportant ainsi que tous les autres documents s'y rattachant soient rédigés exclusivement en langue anglaise.*

***Hong Kong***

No securities have been offered or sold, and no securities be offered or sold, in Hong Kong, by means of any document, other than to persons whose ordinary business is to buy or sell shares or debentures, whether as principal or agent; or to "professional investors" as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong ("SFO") and any rules made under that Ordinance; or in other circumstances which do not result in the document being a "prospectus" as defined in the Companies Ordinance (Cap. 32) of Hong Kong ("CO") or which do not constitute an offer or invitation to the public for the purpose of the CO or the SFO. No document, invitation or advertisement relating to the securities has been issued or may be issued or may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere), which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted under the securities laws of Hong Kong) other than with respect to the securities which are or are intended to be disposed of only to persons outside Hong Kong or only to "professional investors" as defined in the SFO and any rules made under that Ordinance.

This prospectus supplement has not been registered with the Registrar of Companies in Hong Kong. Accordingly, this prospectus supplement may not be issued, circulated or distributed in Hong Kong, and the securities may not be offered for subscription to members of the public in Hong Kong. Each person acquiring the securities will be required, and is deemed by the acquisition of the securities, to confirm that he is aware of the restriction on offers of the securities described in this prospectus supplement and the relevant offering documents and that he is not acquiring, and has not been offered any securities in circumstances that contravene any such restrictions.

***Israel***

This prospectus supplement does not constitute a prospectus under the Israeli Securities Law, 5728-1968, or the Securities Law, and has not been filed with or approved by the Israel Securities Authority. In Israel, this prospectus is being distributed only to, and is directed only at, and any offer of the securities is directed only at, (i) a limited number of persons in accordance with the Israeli Securities Law and (ii) investors listed in the first addendum, or the Addendum, to the Israeli Securities Law, consisting primarily of joint investment in trust funds, provident funds, insurance companies, banks, portfolio managers, investment advisors, members of the Tel Aviv Stock Exchange, underwriters, venture capital funds, entities with equity in excess of NIS 50 million and "qualified individuals," each as defined in the Addendum (as it may be amended from time to time), collectively referred to as qualified investors (in each case, purchasing for their own account or, where permitted under the Addendum, for the accounts of their clients who are investors listed in the Addendum). Qualified investors are required to submit written confirmation that they fall within the scope of the Addendum, are aware of the meaning of same and agree to it.

***Singapore***

This prospectus supplement has not been and will not be lodged or registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus supplement and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the securities may not be circulated or distributed, nor may the securities be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor under Section 274 of the Securities and Futures Act, Chapter 289 of Singapore (the "SFA"), (ii) to a relevant person pursuant to Section 275(1), or any person pursuant to Section 275(1A), and in accordance with the conditions specified in Section 275, of the SFA, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the securities are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) a corporation (which is not an accredited investor (as defined in Section 4A of the SFA)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary of the trust is an individual who is an accredited investor, securities (as defined in Section 239(1) of the SFA) of that corporation or the beneficiaries' rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the securities pursuant to an offer made under Section 275 of the SFA except:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) to an institutional investor or to a relevant person defined in Section 275(2) of the SFA, or to any person arising from an offer referred to in Section 275(1A) or Section 276(4)(i)(B) of the SFA;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) where no consideration is or will be given for the transfer;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) where the transfer is by operation of law;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) as specified in Section 276(7) of the SFA; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) as specified in Regulation 32 of the Securities and Futures (Offers of Investments) (Shares and Debentures) Regulations 2005 of Singapore.

***Japan***

The offering has not been and will not be registered under the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948 of Japan, as amended), or FIEL, and the underwriters will not offer or sell any securities, directly or indirectly, in Japan or to, or for the benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan), or to others for re-offering or resale, directly or indirectly, in Japan or to, or for the benefit of, any resident of Japan, except pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the FIEL and any other applicable laws, regulations and ministerial guidelines of Japan.

***Switzerland***

The securities may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange ("SIX") or on any other stock exchange or regulated trading facility in Switzerland. This prospectus supplement has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this prospectus supplement nor any other offering or marketing material relating to the securities or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this prospectus supplement nor any other offering or marketing material relating to the offering, the Company or the securities have been or will be filed with or approved by any Swiss regulatory authority. In particular, this prospectus supplement will not be filed with, and the offer of the securities will not be supervised by, the Swiss Financial Market Supervisory Authority FINMA, and the offer of the securities has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes ("CISA"). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of the securities.

**LEGAL MATTERS**

Faegre Drinker Biddle & Reath LLP will pass upon the validity of the securities offered hereby on behalf of Celcuity Inc. Cooley LLP, New York, New York is acting as counsel for the underwriters in connection with this offering.

**EXPERTS**

The financial statements included in our Annual Report on Form 10-K for the years ended December 31, 2024 and December 31, 2023, incorporated by reference in this prospectus supplement, have been so incorporated in reliance on the report of Boulay PLLP, an independent registered public accounting firm, and given on the authority of said firm as experts in auditing and accounting.

**INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE**

This prospectus supplement is part of a registration statement on Form S-3 that we filed with the SEC related to the securities to be offered. This prospectus supplement does not contain all of the information set forth in the registration statement and the exhibits and schedules thereto. Some items are omitted in accordance with the rules and regulations of the SEC. For further information with respect to us and the securities offered hereby, we refer you to the registration statement and the exhibits and schedules filed therewith. Statements contained in this prospectus supplement as to the contents of any contract, agreement or any other document referred to are summaries of the material terms of the respective contract, agreement or other document. With respect to each of these contracts, agreements or other documents filed as an exhibit to the registration statement, reference is made to the exhibits for a more complete description of the matter involved.

We are subject to the information requirements of the Exchange Act. In accordance with the Exchange Act, we file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings are also available to the public from the SEC's website at www.sec.gov. In addition, our filings are available from our website at www.celcuity.com. None of the information on our website constitutes a part of this prospectus supplement.

We are "incorporating by reference" into this prospectus supplement certain information that we file with the SEC, which means that we can disclose important information to you by referring you to those documents. Any statement contained or incorporated by reference in this prospectus supplement shall be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained herein, or in any subsequently filed document which also is incorporated by reference herein, modifies or supersedes such earlier statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement. We incorporate by reference the documents listed below (other than information that we have furnished (rather than filed) on Form 8-K, which information is expressly not incorporated by reference herein):

● our Annual Report on [Form 10-K](https://www.sec.gov/Archives/edgar/data/1603454/000164117225001826/form10-k.htm) for the fiscal year ended December 31, 2024, filed with the SEC on March 31, 2025;

● the information specifically incorporated by reference into our Annual Report on Form 10-K from our Definitive Proxy Statement on [Schedule 14A](https://www.sec.gov/Archives/edgar/data/1603454/000164117225002114/formdef14a.htm) , filed with the SEC on April 1, 2025;

● our Quarterly Report on [Form 10-Q](https://www.sec.gov/Archives/edgar/data/1603454/000164117225011053/form10-q.htm) for the quarter ended March 31, 2025, filed with the SEC on May 15, 2025;

● our Current Reports on Form 8-K filed with the SEC on [May 16, 2025](https://www.sec.gov/Archives/edgar/data/1603454/000164117225011273/form8-k.htm) <u>,</u> [June 30, 2025](https://www.sec.gov/Archives/edgar/data/1603454/000164117225017043/form8-k.htm) , and [July 28, 2025](https://www.sec.gov/Archives/edgar/data/1603454/000164117225021095/form8-k.htm) and [July 29, 2025;](https://www.sec.gov/Archives/edgar/data/1603454/000164117225021274/form8-k.htm) and

● the description of our common stock set forth in our registration statement on [Form 8-A](https://www.sec.gov/Archives/edgar/data/1603454/000157104917007886/t1702579_8a.htm) (Registration No. 001-38207), filed with the SEC under Section 12(b) of the Exchange Act on September 15, 2017, as updated by the description of our common stock contained in [Exhibit 4.2](https://www.sec.gov/Archives/edgar/data/1603454/000164117225001826/ex4-2.htm) to our Annual Report on Form 10-K for the year ended December 31, 2024, including any amendments or reports filed for the purpose of updating such description.

All documents that we file pursuant to Section 13(a), 13(c), 14, or 15(d) of the Exchange Act prior to the termination of this offering shall be deemed to be incorporated by reference into this prospectus supplement and to be a part of this prospectus supplement from the respective dates of filing of such documents, except for information furnished under Item 2.02 and Item 7.01 of Form 8-K and related exhibits, which is not deemed filed and not incorporated by reference herein.

You may request a copy of any document we incorporate by reference, except exhibits to the documents (unless the exhibits are specifically incorporated by reference), at no cost, by writing or calling us at:

Celcuity Inc.

16305 36<sup>th</sup> Avenue N., Suite 100

Minneapolis, MN 55446

Attn: Investor Relations

Tel: (763) 392-0123

**PROSPECTUS**

![](forms-3_001.jpg)

**CELCUITY INC.**

**$400,000,000**<br> Common Stock<br> Preferred Stock<br> Warrants<br> Debt Securities<br> Units

The securities covered by this prospectus may include shares of our common stock; shares of preferred stock; warrants to purchase shares of our common stock, preferred stock and/or debt securities; debt securities consisting of debentures, notes or other evidences of indebtedness; or units consisting of any combination of such securities. We may offer the securities from time to time in one or more series or issuances directly to our stockholders or purchasers, or through agents, underwriters or dealers as designated from time to time.

This prospectus provides a general description of the securities we may offer. Each time we sell securities, we will provide specific terms of the securities offered in a supplement to this prospectus. Such a prospectus supplement may also add, update or change information contained in this prospectus. This prospectus may not be used to consummate a sale of securities unless accompanied by the applicable prospectus supplement. We will sell these securities directly to our stockholders or to purchasers or through agents on our behalf or through underwriters or dealers as designated from time to time. If any agents or underwriters are involved in the sale of any of these securities, the applicable prospectus supplement will provide the names of the agents or underwriters and any applicable fees, commissions or discounts.

Our common stock is traded on The Nasdaq Capital Market under the symbol "CELC." On August 28, 2024, the closing price of our common stock was $16.59.

**Investing in our securities involves risks. See "Risk Factors" on page 6.** You should carefully read this prospectus, the documents incorporated herein, and the applicable prospectus supplement before making any investment decision.

**Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.**

The date of this prospectus is December 2, 2024.

**TABLE OF CONTENTS**

---

| | |
|:---|:---|
|  | **Page** |
| [About this Prospectus](#ar_002) | 2 |
| [Our Company](#ar_003) | 3 |
| [Risk Factors](#ar_004) | 6 |
| [Forward-Looking Statements](#ar_005) | 6 |
| [Use of Proceeds](#ar_006) | 8 |
| [Plan of Distribution](#ar_007) | 9 |
| [Securities We May Offer](#ar_008) | 11 |
| [Description of Capital Stock](#ar_009) | 11 |
| [Description of Warrants](#ar_010) | 13 |
| [Description of Debt Securities](#ar_011) | 14 |
| [Description of Units](#ar_012) | 19 |
| [Where You Can Find More Information](#ar_013) | 20 |
| [Incorporation of Certain Documents by Reference](#ar_014) | 20 |
| [Legal Matters](#ar_015) | 20 |
| [Experts](#ar_016) | 20 |

---

**ABOUT THIS PROSPECTUS**

The securities described in this prospectus are part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, using a "shelf" registration process. Under this shelf registration process, we may offer to sell any combination of the securities described in this prospectus in one or more offerings up to a total dollar amount of $400,000,000. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities under this shelf registration, we will provide a prospectus supplement that will contain specific information about the terms of such offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any applicable prospectus supplement, including all documents incorporated herein by reference, together with additional information described under "Where You Can Find More Information" below.

We have not authorized any dealer, agent or other person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus and any accompanying prospectus supplement. You must not rely upon any information or representation not contained or incorporated by reference in this prospectus or an accompanying prospectus supplement. This prospectus and the accompanying prospectus supplement, if any, do not constitute an offer to sell or the solicitation of an offer to buy any securities other than the registered securities to which they relate, nor do this prospectus and any accompanying prospectus supplement constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction. You should not assume that the information contained in this prospectus and any accompanying prospectus supplement, if any, is accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any date subsequent to the date of the document incorporated by reference, even though this prospectus and any accompanying prospectus supplement is delivered or securities are sold on a later date.

Unless the context otherwise requires, "CELC," the "Company," "we," "us," "our" and similar names refer to Celcuity Inc.

**OUR COMPANY**

**Business Overview**

We are a clinical-stage biotechnology company focused on the development of targeted therapies for the treatment of multiple solid tumor indications. Our lead therapeutic candidate is gedatolisib, a potent, well-tolerated, small molecule reversible inhibitor, administered intravenously, that selectively targets all Class I isoforms of phosphatidylinositol-3-kinase (PI3K) and the two mechanistic target of rapamycin (mTOR) sub-complexes, mTORC1 and mTORC2. Gedatolisib's mechanism of action and pharmacokinetic properties are highly differentiated from other currently approved and investigational therapies that target PI3K or mTOR alone or together.

In April 2021, we obtained exclusive global development and commercialization rights to gedatolisib under a license agreement with Pfizer, Inc. We believe there is significant potential for gedatolisib to address breast and prostate cancer tumors, and it has the potential to be used in other tumor types where the PAM pathway is either: i) driving tumorigenesis directly; ii) cooperating with other dysregulated signaling pathways; or iii) a mechanism of resistance to other drug therapies.

In 2022, the Company began enrolling patients in VIKTORIA-1, a Phase 3 study evaluating gedatolisib and fulvestrant with and without Ibrance® (palbociclib) as second line treatment for patients with HR+, HER2- advanced breast cancer. In early 2024, the Company began enrolling patients in CELC-G-201, a Phase 1b/2 study evaluating gedatolisib combined with Nubeqa® (darolutamide) in patients with metastatic castration resistant prostate cancer (mCRPC). In May 2024, the Company announced plans to initiate VIKTORIA-2, a Phase 3 trial evaluating gedatolisib combined with fulvestrant plus a CDK 4/6 inhibitor as first-line treatment for patients with HR+, HER2- advanced breast cancer. The first patient is expected to be enrolled in the second quarter of 2025. We expect gedatolisib to:

● **Overcome limitations of therapies that only inhibit a single Class I PI3K isoform or only one mTOR kinase complex.** 

Gedatolisib is a pan-class I isoform PI3K inhibitor with low nanomolar potency for the p110α, p110β, p110γ, and p110δ isoforms and mTORC1 and mTORC2 complexes. Each PI3K isoform and mTOR complex is known to preferentially affect different signal transduction events that involve tumor cell survival, depending upon the aberrations associated with the linked pathway. When a therapy only inhibits a single Class I isoform (e.g., alpelisib, a PI3K-α inhibitor) or only one mTOR kinase complex (e.g., everolimus, an mTORC1 inhibitor), numerous feedforward and feedback loops between the PI3K isoforms and mTOR complexes cross-activate the uninhibited sub-units. This, in turn, induces compensatory resistance that can reduce the efficacy of isoform specific PI3K or single mTOR kinase complex inhibitors. Inhibiting all four PI3K isoforms and both mTOR complexes, as gedatolisib does, thus prevents the confounding effect of isoform interaction that may occur with isoform-specific PI3K inhibitors and the confounding interaction between PI3K isoforms and mTOR.

● **Be Better tolerated by patients than oral PI3K and mTOR drugs.** 

Gedatolisib is administered intravenously (IV) on a four-week cycle of three weeks-on, one week-off, in contrast to the orally administered pan-PI3K or dual PI3K/mTOR inhibitors that are no longer being clinically developed. Oral pan-PI3K or PI3K/mTOR inhibitors have repeatably been found to induce significant side effects that were not well tolerated by patients. This typically leads to a high proportion of patients requiring dose reductions or treatment discontinuation. The challenging toxicity profile of these drug candidates ultimately played a significant role in the decisions to halt their development, despite showing promising efficacy. By contrast, gedatolisib stabilizes at lower concentration levels in plasma compared to orally administered PI3K inhibitors, resulting in less toxicity, while maintaining concentrations sufficient to inhibit PI3K/mTOR signaling.

Isoform-specific PI3K inhibitors administered orally were developed to reduce toxicities in patients. While the range of toxicities associated with isoform-specific inhibitors is narrower than oral pan-PI3K or PI3K/mTOR inhibitors, administering them orally on a continuous basis still leads to challenging toxicities. The experience with an FDA approved oral p110-α specific inhibitor, Piqray, illustrates the challenge. In its Phase 3 pivotal trial Piqray was found to induce a Grade 3 or 4 adverse event (AE) related to hyperglycemia in 39% of patients evaluated. In addition, 26% of patients discontinued alpelisib due to treatment related adverse events. By contrast, in the 103-patient dose expansion portion of the Phase 1b clinical trial with gedatolisib, only 7% of patients experienced Grade 3 or 4 hyperglycemia and less than 9% discontinued treatment.

As of June 30, 2024, 492 patients with solid tumors have received gedatolisib in eight completed clinical trials. Of the 492 patients, 129 were treated with gedatolisib as a single agent in three clinical trials. The remaining 363 patients received gedatolisib in combination with other anti-cancer agents in five clinical trials. Additional patients received gedatolisib in combination with other anti-cancer agents in nine investigator sponsored clinical trials.

A Phase 1b trial (B2151009) evaluating patients with HR+/HER2- metastatic breast cancer was initiated in 2016 and subsequently enrolled 138 patients. Four patients from this study continue to receive study treatment, as of June 30, 2024, each of whom have received study treatment for more than five years. The B2151009 clinical was an open label, multiple arm Phase 1b study that evaluated gedatolisib in combination with palbociclib (CDK4/6 inhibitor) and fulvestrant or letrozole in patients with HR+/HER2- advanced breast cancer. Thirty-five patients were enrolled in two dose escalation arms to evaluate the safety and tolerability and to determine the maximum tolerated dose (MTD) of gedatolisib when used in combination with the standard doses of palbociclib and endocrine therapy (letrozole or fulvestrant). The MTD was determined to be 180 mg administered intravenously once weekly. A total of 103 patients were subsequently enrolled in one of four expansion arms (A, B, C, D).

High objective overall response rates (ORR) were observed in all four expansion arms and were comparable in each arm for *PIK3CA* WT and *PIK3CA* MT patients. As of the data cut-off date, March 16, 2023, for treatment- naïve patients in Escalation Arm A and Expansion Arm A (n=41), median progression free survival (mPFS) was 48.6 months, median duration of response (mDOR) was 46.9 months, and ORR was 79%, respectively. This data compares favorably to published data for current first-line standard-of-care treatments for patients with HR+, HER2- advanced breast cancer. In patients who received prior hormonal therapy alone or in combination with a CDK4/6 inhibitor (Arms B, C, and D), ORR (including unconfirmed partial responses) ranged from 36% to 77%. Each arm achieved its primary endpoint target, which was reporting higher ORR in the study arm than ORR from either the PALOMA-2 (ORR=55%) study that evaluated palbociclib plus letrozole for Arm A or the PALOMA-3 study (ORR=25%) that evaluated palbociclib plus fulvestrant for Arms B, C, and D. For all enrolled patients, a clinical benefit rate (CBR) of ≥ 79% was observed. Median progression-free survival (PFS) was 12.9 months for patients who received a prior CDK4/6 inhibitor and were treated in the study with the Phase 3 dosing schedule (Arm D).

Gedatolisib combined with palbociclib and endocrine therapy demonstrated a favorable safety profile with manageable toxicity. The majority of treatment emergent adverse events were Grade 1 and 2. The most frequently observed adverse events included stomatitis/mucosal inflammation, the majority of which were Grade 1 and 2. The most common Grade 4 AEs were neutropenia and neutrophil count decrease, which were assessed as related to treatment with palbociclib. No grade 5 events were reported in this study.

We are currently enrolling patients in a Phase 3, open-label, randomized clinical trial (VIKTORIA-1) to evaluate the efficacy and safety of two regimens in adults with HR+/HER2- advanced breast cancer whose disease has progressed after prior CDK4/6 therapy in combination with an aromatase inhibitor: 1) gedatolisib in combination with palbociclib and fulvestrant; and 2) gedatolisib in combination with fulvestrant. Approximately two hundred clinical sites in North America, Europe, South America, Asia, and Australia have been selected to participate in the study. The first clinical site was activated in the third quarter of 2022, and the first patient was dosed in December 2022.

The VIKTORIA-1 clinical trial will enable separate evaluation of subjects according to their *PIK3CA* status. Subjects who meet eligibility criteria and are *PIK3CA* WT will be randomly assigned (1:1:1) to receive a regimen of either gedatolisib, palbociclib, and fulvestrant (Arm A), gedatolisib and fulvestrant (Arm B), or fulvestrant (Arm C). Subjects who meet eligibility criteria and are *PIK3CA* MT will be randomly assigned (3:3:1) to receive a regimen of either gedatolisib, palbociclib, and fulvestrant (Arm D) or alpelisib and fulvestrant (Arm E), or gedatolisib and fulvestrant (Arm F). Enrollment of the *PIK3CA* wild-type cohort is more than 80% complete and expected to reach the enrollment target during Q4 2024. The *PIK3CA* wild-type cohort represents approximately 60% of the total patients enrolled to date in VIKTORIA-1. In light of this, we expect topline data for the *PIK3CA* WT cohort to shift to sometime between late Q4 2024 and Q1 2025.

We received approval from the FDA in mid-2023 to proceed with the clinical development of gedatolisib in combination with Nubeqa® (darolutamide), an approved androgen receptor inhibitor, for the treatment of patients with mCRPC. We have since initiated a Phase 1b/2 study (CELC-G-201) that will enroll up to 54 participants with mCRPC who progressed after treatment with an androgen receptor inhibitor. We dosed our first patient in this trial in February 2024.

In the Phase 1b portion of the study, Celcuity expects that 36 participants will be randomly assigned to receive 600 mg darolutamide combined with either 120 mg gedatolisib in Arm 1 or 180 mg gedatolisib in Arm 2. An additional 12 participants will then be enrolled in the Phase 2 portion of the study at the recommended phase 2 dose (RP2D) level to enable evaluation of 30 participants treated with the RP2D of gedatolisib.

The primary objectives of the Phase 1b portion of the trial include assessment of the safety and tolerability of gedatolisib in combination with darolutamide and determination of the recommended Phase 2 dose of gedatolisib. The primary objective of the Phase 2 portion of the trial is to assess the radiographic progression-free survival (rPFS) at six months of patients who received the RP2D.

The Phase 3 VIKTORIA-2 clinical trial, an open-label, randomized study to evaluate the efficacy and safety of gedatolisib combined with fulvestrant plus a CDK4/6 inhibitor in comparison to fulvestrant plus a CDK4/6 inhibitor as first-line treatment for patients with HR+/HER2- advanced breast cancer who are endocrine therapy resistant, will be initiated in 2025. For the CDK4/6 inhibitor, investigators may choose either ribociclib or palbociclib. The safety profile of gedatolisib combined with fulvestrant and palbociclib is well described, but the investigational combination of gedatolisib with ribociclib has not yet been clinically tested. Therefore, a safety run-in of approximately 12-36 subjects will evaluate the safety profile of gedatolisib combined with ribociclib and fulvestrant. The safety run-in will be completed, and gedatolisib's Phase 3 dose confirmed, before enrolling patients in the Phase 3 portion of the study.

For the Phase 3 study, approximately 638 subjects who meet the eligibility criteria will be assigned to a cohort based on their *PIK3CA* mutation status. After the investigator selects the CDK4/6 inhibitor for a subject, the subject will then be randomly assigned on a 1:1 basis to either Arm A (gedatolisib, fulvestrant, and Investigator's choice of ribociclib or palbociclib) or Arm B (fulvestrant and Investigator's choice of ribociclib or palbociclib).

The clinical trial primary endpoints are progression free survival (PFS), per RECIST 1.1 criteria, as assessed by blinded independent central review. The primary PFS endpoints will be evaluated separately in subjects who are PI3KCA wild type and PI3KCA mutant.

The study's design was reviewed and discussed with the U.S. Food and Drug Administration (FDA) during a Type C meeting. This global trial is expected to enroll subjects at up to 200 clinical sites across North America, Europe, Latin America, and Asia. Celcuity expects to enroll the first patient in the second quarter of 2025.

During the quarter ended June 30, 2024, the Company raised $129.0 million in gross proceeds from equity and debt financings, which we expect to provide sufficient cash to finance our operations and pay obligations when due through 2026.

**Authorized Share Increase**

Our Certificate of Incorporation currently authorizes the issuance of up to 65,000,000 shares of Common Stock and 2,500,000 shares of preferred stock, $0.001 par value per share. As of August 9, 2024, 37,030,155 shares of our Common Stock were issued and outstanding and 20,754,742 shares of Common Stock were reserved for issuance upon the exercise of outstanding equity awards and other convertible securities. The 7,215,103 shares of Common Stock available for issuance (after taking into account the number of shares of Common Stock that are outstanding and reserved) represent approximately 11.1% of the 65,000,000 shares of Common Stock authorized for issuance under our Certificate of Incorporation.

As disclosed in our Definitive Proxy Statement on Schedule 14A that we filed with the Securities and Exchange Commission on August 28, 2024, which is incorporated herein by reference, we have asked our stockholders to approve an amendment to our Certificate of Incorporation to increase the number of authorized shares of Common Stock from 65,000,000 shares to 95,000,000 shares at a Special Meeting of Stockholders (the "Special Meeting") to be held on October 7, 2024. Our ability to offer and sell the maximum number of securities offered by this prospectus, based on a closing price of our Common Stock of $16.59 as of August 28, 2024, is conditioned upon receipt of stockholder approval of this proposal and subsequent effectiveness of the proposed Certificate of Amendment to our Certificate of Incorporation, a form of which is included with Exhibit 3.2 and incorporated herein by reference. If the holders of a majority of the shares of Common Stock casting votes, either in person or by proxy, do not vote in favor of this proposal at the Special Meeting, we may still offer and sell securities under this prospectus, but the number of such securities that may be offered and sold will be limited by the number of authorized shares of Common Stock available for issuance under our Certificate of Incorporation. If this proposal is approved by our stockholders at the Special Meeting, the amendment to our Certificate of Incorporation will become effective upon the filing of a Certificate of Amendment to our Certificate of Incorporation with the Secretary of State of the State of Delaware.

**Additional Information**

Our principal executive office is located at 16305 36th Avenue North, Suite 100, Minneapolis, Minnesota. Our telephone number is (763) 392-0767, and our website is www.celcuity.com. The information contained on or accessible through our website is not incorporated by reference into, and should not be considered part of, this prospectus or the information incorporated herein by reference.

**Implications of Being a Smaller Reporting Company**

We are a "smaller reporting company" as defined in Rule 12b-2 promulgated under the Securities Exchange Act. We may remain a smaller reporting company if either (i) the market value of our stock held by non-affiliates is less than $250 million or (ii) our annual revenue was less than $100 million during the most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700 million. As a smaller reporting company, we may rely on exemptions from certain disclosure requirements that are available to smaller reporting companies. Specifically, as a smaller reporting company, we may choose to present only the two most recent years of audited financial statements in our Annual Report on Form 10-K and smaller reporting companies have reduced disclosure obligations regarding executive compensation.

We have taken advantage of these reduced reporting requirements in this prospectus and the information incorporated herein by reference. Accordingly, the information contained herein may be different from the information you receive from other public companies that are not smaller reporting companies.

**RISK FACTORS**

Investing in our securities involves risk. You should consider the risks, uncertainties and assumptions discussed under the heading "Risk Factors" in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed on March 27, 2024 with the Securities and Exchange Commission ("SEC"), which is incorporated herein by reference, and may be amended, supplemented or superseded from time to time by other reports we file with the SEC in the future. See "Where You Can Find More Information" and "Incorporation of Certain Information by Reference." The risks and uncertainties we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our operations. If any of these risks were to occur, our business, financial condition, and results of operations could be severely harmed. This could cause the trading price of our common stock to decline, and you could lose all or part of your investment.

In addition, any prospectus supplement applicable to each offering of our securities will contain a discussion of the risks applicable to such an investment in us. Prior to making a decision about investing in our securities, you should carefully consider the specific factors discussed under the heading "Risk Factors" in the applicable prospectus supplement, together with all of the other information contained or incorporated by reference in such prospectus supplement or appearing or incorporated by reference in this prospectus.

**FORWARD-LOOKING STATEMENTS**

All statements, other than statements of historical facts, contained in this prospectus, any prospectus supplement and the documents incorporated herein by reference, including statements regarding our plans, objectives and expectations for our business, operations and financial performance and condition, are forward-looking statements. In some cases, you can identify forward-looking statements by the following words: "anticipate," "believe," "continue," "could," "estimate," "expect," "intend," "may," "might," "target," "ongoing," "plan," "potential," "predict," "project," "should," "will," "would," or the negative of these terms or other comparable terminology, although not all forward-looking statements contain these words. Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our results, performance or achievements to be materially different from the information expressed or implied by the forward-looking statements in this prospectus, any prospectus supplement and the documents incorporated herein by reference. Additionally, our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments that we may make. Forward-looking statements may include, among other things, statements relating to:

● our clinical trial plans and the estimated timelines and costs for such trials;

● our plans to develop and commercialize our products, and our expectations about the market opportunity for gedatolisib tests, and our ability to serve those markets;

● our expectations with respect to our competitive advantages, including the potential efficacy of gedatolisib in various patient types alone or in combination with other treatments;

● our expectations regarding the timeline of patient enrollment and results from clinical trials, including our existing Phase 3 VIKTORIA-1 clinical trial and Phase 1b/2 study and clinical trial, as well as our planned Phase 3 VIKTORIA-2 clinical trial for gedatolisib;

● our expectations with respect to the development, validation, required approvals, costs and timelines of gedatolisib;

● our beliefs related to the potential benefits resulting from Breakthrough Therapy designation for gedatolisib;

● our beliefs about our ability to capitalize on the exclusive global development and commercialization rights obtained from our license agreement with Pfizer with respect to gedatolisib;

● our plans with respect to research and development and related expenses for the foreseeable future;

● our beliefs with respect to the potential rate and degree of market acceptance, both in the United States and internationally, and clinical utility of our therapeutics, diagnostic platform and tests;

● our intended business development activities, including collaborations with pharmaceutical companies;

● our expectations with respect to accessing our current debt facility or any other debt facility or other capital sources in the future;

● our beliefs regarding the adequacy of our cash on hand to fund our research and development expenses, capital expenditures, working capital, sales and marketing expenses, and other general corporate expenses, as well as the increased costs associated with being a public company; and

● our expectations regarding our ability to obtain and maintain intellectual property protection for our product candidates, including our gedatolisib drug candidate and our CELsignia platform and tests.

These statements involve known and unknown risks, uncertainties and other factors that may cause our results or our industry's actual results, levels of activity, performance or achievements to be materially different from the information expressed or implied by these forward-looking statements. Certain risks, uncertainties and other factors include, but are not limited to, our limited operating history; our potential inability to develop, validate and commercialize gedatolisib on a timely basis or at all; the uncertainties and costs associated with clinical studies and with developing and commercializing biopharmaceuticals; the complexity and difficulty of demonstrating the safety and sufficient magnitude of benefit to support regulatory approval of gedatolisib and other products we may develop; challenges we may face in developing and maintaining relationships with pharmaceutical company partners; the uncertainty regarding market acceptance of our products and services by physicians, patients, third-party payors and others in the medical community; uncertainty with respect to the size of market opportunities available to us; uncertainty regarding the pricing of drug products and molecular and other diagnostic products and services that compete or may compete with us; uncertainty with insurance coverage and reimbursement for our products and services; the potential impact of public health matters on our business and clinical study activities; difficulties we may face in managing growth, such as hiring and retaining key personnel; changes in government regulations; costs to comply with evolving regulations; and obtaining and maintaining intellectual property protection for our technology and time and expense associated with defending third-party claims of intellectual property infringement, investigations or litigation threatened or initiated against us. See "Risk Factors" beginning on page 6 of this prospectus for additional risks, uncertainties and other factors applicable to the Company.

In addition, statements that "we believe" and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this prospectus, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

**USE OF PROCEEDS**

Except as otherwise provided in the applicable prospectus supplement, we intend to use the net proceeds from the sale of the securities covered by this prospectus for working capital and general corporate purposes. General corporate purposes may include working capital, capital expenditures, research and development expenditures, clinical trial expenditures, expansion of business development activities (including sales, marketing and reimbursement functions) and other general corporate purposes. We may also use a portion of our net proceeds to acquire or invest in complementary products, technologies or businesses, although we have no present commitments to complete any such transaction. Additional information on the use of net proceeds from the sale of securities covered by this prospectus may be set forth in any prospectus supplement relating to the specific offering.

The amounts and timing of our expenditures will depend on numerous factors, including the status, results and timing of our current and expected clinical trials involving gedatolisib and other corporate developments. Accordingly, our management will have broad discretion over the use of the net proceeds from the sale of any securities offered by us.

**PLAN OF DISTRIBUTION**

We may sell the securities offered through this prospectus from time to time pursuant to underwritten public offerings, negotiated transactions, block trades or a combination of these methods. We may sell the securities to or through underwriters or dealers, through agents, directly to one or more purchasers, including our affiliates, or through a combination of any of these methods. We may distribute securities from time to time in one or more transactions:

● at a fixed price or prices, which may be changed;

● at market prices prevailing at the time of sale;

● prices related to the prevailing market prices; or

● at negotiated prices.

We may also sell securities covered by this prospectus in an "at the market offering" as defined in Rule 415 under the Securities Act. Such at the market offerings, if any, may be conducted by underwriters acting as principal or agent.

A prospectus supplement or supplements (and any related free writing prospectus that we may authorize to be provided to you) will describe the terms of the offering of the securities, including, to the extent applicable:

● the name or names of any underwriters, dealers or agents, if any;

● the purchase price of the securities and the proceeds we will receive from the sale;

● any options under which underwriters may purchase additional securities from us;

● any delayed delivery arrangements;

● any underwriting discounts, commissions and other items constituting underwriters' compensation;

● any public offering price;

● any discounts or concessions allowed or reallowed or paid to dealers; and

● any commissions paid to agents.

If underwriters are used in the sale, the underwriters will acquire the securities for their own account, including through underwriting, purchase, security lending or repurchase agreements with us. Only underwriters named in the prospectus supplement are underwriters of the securities offered by the prospectus supplement. The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions. Underwriters may sell the securities in order to facilitate transactions in any of our other securities (described in this prospectus or otherwise), including other public or private transactions and short sales. Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. Unless otherwise indicated in the prospectus supplement, the obligations of the underwriters to purchase the securities will be subject to certain conditions, and the underwriters will be obligated to purchase all the offered securities if they purchase any of them. Any public offering price and any discounts or concessions allowed or reallowed or paid to dealers may change from time to time. The prospectus supplement will include the names of the principal underwriters, the respective amount of securities underwritten, the nature of the obligation of the underwriters to take the securities and the nature of any material relationship between an underwriter and us.

If dealers are used in the sale of securities offered through this prospectus, we will sell the securities to them as principals. They may then resell those securities to the public at varying prices determined by the dealers at the time of resale. The prospectus supplement will include the names of the dealers and the terms of the transaction.

We may sell the securities offered through this prospectus directly. In this case, no underwriters or agents would be involved. Such securities may also be sold through agents designated from time to time. The prospectus supplement will name any agent involved in the offer or sale of the offered securities and will describe any commissions payable to the agent by us. Unless otherwise indicated in the prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchases for the period of its appointment.

We may sell the securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act with respect to any sale of those securities. The terms of any such sales will be described in the prospectus supplement.

If the prospectus supplement indicates, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase securities at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery on a specified date in the future. The contracts would be subject only to those conditions described in the prospectus supplement. The applicable prospectus supplement will describe the commission payable for solicitation of those contracts.

We may provide underwriters, dealers and agents with indemnification against civil liabilities related to the offerings pursuant to this prospectus, including liabilities under the Securities Act, or contribution with respect to payments that the agents or underwriters may make with respect to these liabilities. Underwriters, agents and dealers may engage in transactions with, or perform services for, us in the ordinary course of business.

Unless the applicable prospectus supplement states otherwise, each series of securities offered by us will be a new issue and will have no established trading market, other than our common stock, which is listed on The Nasdaq Capital Market. We may elect to list any series of offered securities on an exchange. Any underwriters that we use in the sale of offered securities may make a market in such securities, but may discontinue such market making at any time without notice. Therefore, we cannot assure you that the securities will have a liquid trading market.

Any underwriter may also engage in stabilizing transactions, syndicate covering transactions and penalty bids in accordance with Rule 104 under the Securities Exchange Act of 1934, as amended. Stabilizing transactions involve bids to purchase the underlying security in the open market for the purpose of pegging, fixing or maintaining the price of the securities. Syndicate covering transactions involve purchases of the securities in the open market after the distribution has been completed in order to cover syndicate short positions. Penalty bids permit the underwriters to reclaim a selling concession from a syndicate member when the securities originally sold by the syndicate member are purchased in a syndicate covering transaction to cover syndicate short positions. Stabilizing transactions, syndicate covering transactions and penalty bids may cause the price of the securities to be higher than it would be in the absence of the transactions. The underwriters may, if they commence these transactions, discontinue them at any time.

We, the underwriters or other agents may engage in derivative transactions involving the securities. These derivatives may consist of short sale transactions and other hedging activities. The underwriters or agents may acquire a long or short position in the securities, hold or resell securities acquired and purchase options or futures on the securities and other derivative instruments with returns linked to or related to changes in the price of the securities. In order to facilitate these derivative transactions, we may enter into security lending or repurchase agreements with the underwriters or agents. The underwriters or agents may effect the derivative transactions through sales of the securities to the public, including short sales, or by lending the securities in order to facilitate short sale transactions by others. The underwriters or agents may also use the securities purchased or borrowed from us or others (or, in the case of derivatives, securities received from us in settlement of those derivatives) to directly or indirectly settle sales of the securities or close out any related open borrowings of the securities.

**SECURITIES WE MAY OFFER**

This prospectus contains summary descriptions the common stock, preferred stock, warrants, debt securities, and units that we may offer and sell from time to time. These summary descriptions are not meant to be complete descriptions of each security. However, at the time of an offering and sale, this prospectus together with the accompanying prospectus supplement will contain the material terms of the securities being offered.

**DESCRIPTION OF CAPITAL STOCK**

The following summary of the terms of our capital stock is subject to and qualified in its entirety by reference to applicable Delaware law, our certificate of incorporation, as amended, and bylaws, copies of which are filed as Exhibits 3.1 and 3.3, respectively, to the registration statement of which this prospectus forms a part and are incorporated herein by reference. Please refer to "Where You Can Find More Information" below for directions on obtaining these documents.

As of August 30, 2024, our authorized capital consists of:

● 65,000,000 shares of common stock, $0.001 par value per share; and

● 2,500,000 shares of preferred stock, $0.001 par value per share, of which 1,850,000 shares are designated as Series A Convertible Preferred Stock (the "Series A Preferred Stock").

The number of authorized shares of common stock may be increased or decreased (but not below the number of shares of common stock then outstanding) by the affirmative vote of the holders of a majority of the shares of common stock casting votes at a properly convened meeting of Company stockholders. Our Board of Directors has approved, subject to stockholder approval, an amendment to our Certificate of Incorporation increasing the authorized number of shares of the Company's Common Stock from 65,000,000 shares to 95,000,000 shares (the "Authorized Share Amendment"). We expect to submit the Authorized Share Amendment to Company stockholders at a special meeting of stockholders and, if the Authorized Share Amendment is approved by stockholders, we plan to effect the Authorized Share Amendment by filing a Certificate of Amendment to our Certificate of Incorporation. We cannot guarantee that stockholders will approve the Authorized Share Amendment. See the Definitive Proxy Statement on Schedule 14A filed by the Company on August 28, 2024, and the proposed Certificate of Amendment to our Certificate of Incorporation included in Exhibit 3.2 to this registration statement, which are incorporated herein by reference.

**Common Stock**

***Voting Rights***

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Each holder of common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders.

***Dividend Rights***

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Holders of our common stock are entitled to receive ratably any dividends that our board of directors may declare out of funds legally available for that purpose.

***Rights and Preferences***

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Holders of our common stock have no preemptive, conversion, subscription or other rights, and there are no redemption or sinking fund provisions applicable to our common stock.

***Right to Liquidation Distributions***

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Upon our liquidation, dissolution or winding-up, the assets legally available for distribution to our stockholders would be distributable ratably among the holders of our common stock and any participating preferred stock outstanding at that time, subject to prior satisfaction of all outstanding debt and liabilities and the preferential rights of and the payment of liquidation preferences, if any, on any outstanding shares of preferred stock.

***Transfer Agent and Registrar***

 

The transfer agent and registrar for our common stock is Continental Stock Transfer & Trust Company. The transfer agent and registrar's address is One State Street Plaza, 30th Floor, New York, NY 10004.

***The Nasdaq Capital Market***

 

Our common stock is listed for quotation on The Nasdaq Capital Market under the symbol "CELC."

**Preferred Stock**

Our board of directors is authorized, without action by the stockholders, to designate and issue up to an aggregate of 2,500,000 shares of preferred stock in one or more series. Our board of directors is authorized to designate the rights, preferences and privileges of the shares of each series and any of its qualifications, limitations or restrictions. Our board of directors is able to authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of common stock. The issuance of preferred stock, while providing flexibility in connection with possible future financings and acquisitions and other corporate purposes could, under certain circumstances, have the effect of restricting dividends on our common stock, diluting the voting power of our common stock, impairing the liquidation rights of our common stock, or delaying, deferring or preventing a change in control of the Company, which might harm the market price of our common stock. See also "Anti-Takeover Effect of Delaware Law and Certain Charter and Bylaw Provisions" below.

On May 16, 2022, in connection with a Securities Purchase Agreement, dated May 15, 2022, by and among the Company and the Investors named therein, we filed a Certificate of Designations with the Secretary of State of the State of Delaware, designating 1,850,000 shares out of the authorized but unissued shares of our preferred stock as Series A Preferred Stock.

If we offer a specific class or series of preferred stock under this prospectus, we will describe the terms of the preferred stock in the prospectus supplement for such offering and will file a copy of the certificate establishing the terms of the preferred stock with the SEC. The preferred stock offered by this prospectus, when issued, will not have, or be subject to, any preemptive or similar rights.

***Transfer Agent and Registrar***

The transfer agent and registrar for any series or class of preferred stock will be set forth in each applicable prospectus supplement.

**Anti-Takeover Effect of Delaware Law and Certain Charter and Bylaw Provisions**

Our certificate of incorporation, as amended, and bylaws contain provisions that could have the effect of discouraging potential acquisition proposals or tender offers or delaying or preventing a change of control of our Company. A summary of these provisions is as follows:

●  ***Board of directors vacancies.*** Our bylaws authorize only our board of directors to fill vacant directorships, including newly created seats. In addition, the number of directors constituting our board of directors will be permitted to be set only by a resolution adopted by our board of directors. These provisions would prevent a stockholder from increasing the size of our board of directors and then gaining control of our board of directors by filling the resulting vacancies with its own nominees. This makes it more difficult to change the composition of our board of directors but promotes continuity of management.

●  ***Advance notice requirements for stockholder proposals and director nominations.*** Our bylaws provide advance notice procedures for stockholders seeking to bring business before our annual meeting of stockholders or to nominate candidates for election as directors at our annual meeting of stockholders. Our bylaws also specify certain requirements regarding the form and content of a stockholder's notice. These provisions might preclude our stockholders from bringing matters before our annual meeting of stockholders or from making nominations for directors at our annual meeting of stockholders if the proper procedures are not followed. These provisions may also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer's own slate of directors or otherwise attempting to obtain control of the Company.

●  ***No cumulative voting.*** The Delaware General Corporation Law, or DGCL, provides that stockholders are not entitled to the right to cumulate votes in the election of directors unless a corporation's certificate of incorporation provides otherwise. Our certificate of incorporation, as amended, does not provide for cumulative voting.

●  ***Stockholder action; special meetings of stockholders.*** Our certificate of incorporation, as amended, provides that our stockholders may not take action by written consent, but may only take action at annual or special meetings of our stockholders. As a result, a holder controlling a majority of our capital stock would not be able to amend our bylaws or remove directors without holding a meeting of our stockholders called in accordance with our bylaws. Further, our bylaws provide that special meetings of our stockholders may be called only by a majority of our board of directors, the chairperson of our board of directors, or our Chief Executive Officer, thus prohibiting a stockholder from calling a special meeting. These provisions might delay the ability of our stockholders to force consideration of a proposal or for stockholders controlling a majority of our capital stock to take any action, including the removal of directors.

●  ***Issuance of undesignated preferred stock.*** As of August 30, 2024, we have 650,000 shares of undesignated preferred stock. Our board of directors has the authority, without further action by the stockholders, to issue this preferred stock with rights and preferences, including voting rights, designated from time to time by our board of directors. The existence of authorized but unissued shares of preferred stock would enable our board of directors to render more difficult or to discourage an attempt to obtain control of us by means of a merger, tender offer, proxy contest or other means.

●  ***Amendment of charter and bylaw provisions.*** The affirmative vote of stockholders representing at least two-thirds of the voting power of all then-outstanding capital stock is required to amend, alter or repeal certain provisions of our certificate of incorporation, as amended, including the provision noted above regarding stockholders not being able to act by written consent. A majority of our board of directors has authority to adopt, amend or repeal provisions of our bylaws. Stockholders also have the authority to adopt, amend or repeal provisions of our bylaws, but only with the affirmative vote of stockholders representing at least two-thirds of the voting power of all then-outstanding capital stock.

We are subject to the provisions of Section 203 of the DGCL, an anti-takeover law. In general, Section 203 prohibits a publicly held Delaware corporation from engaging in a "business combination" with an "interested stockholder" for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. For purposes of Section 203, a "business combination" includes a merger, asset sale or other transaction resulting in a financial benefit to the interested stockholder, and an "interested stockholder" is a person who owns 15% or more of the voting stock of a corporation, or any affiliate or associate of a corporation who, within three years prior, did own 15% or more of the voting stock of that corporation.

**DESCRIPTION OF WARRANTS**

We may issue warrants to purchase shares of our common stock, preferred stock and/or debt securities in one or more series together with other securities or separately, as described in each applicable prospectus supplement. Below is a description of certain general terms and provisions of the warrants that we may offer. Particular terms of the warrants will be described in the applicable warrant agreements and the applicable prospectus supplement for the warrants.

The applicable prospectus supplement will contain, where applicable, the following terms of and other information relating to the warrants:

● the specific designation and aggregate number of, and the price at which we will issue, the warrants;

● the currency or currency units in which the offering price, if any, and the exercise price are payable;

● the designation, amount and terms of the securities purchasable upon exercise of the warrants;

● if applicable, the exercise price for shares of our common stock and the number of shares of common stock to be received upon exercise of the warrants;

● if applicable, the exercise price for shares of our preferred stock, the number of shares of preferred stock to be received upon exercise, and a description of that class or series of our preferred stock;

● if applicable, the exercise price for our debt securities, the amount of our debt securities to be received upon exercise, and a description of that series of debt securities;

● the date on which the right to exercise the warrants will begin and the date on which that right will expire or, if the warrants may not be continuously exercised throughout that period, the specific date or dates on which the warrants may be exercised;

● whether the warrants will be issued in fully registered form or bearer form, in definitive or global form or in any combination of these forms, although, in any case, the form of a warrant included in a unit will correspond to the form of the unit and of any security included in that unit;

● any applicable material U.S. federal income tax consequences;

● the identity of the warrant agent for the warrants and of any other depositaries, execution or paying agents, transfer agents, registrars or other agents;

● the proposed listing, if any, of the warrants or any securities purchasable upon exercise of the warrants on any securities exchange;

● if applicable, the date from and after which the warrants and the common stock, preferred stock and/or debt securities will be separately transferable;

● if applicable, the minimum or maximum amount of the warrants that may be exercised at any one time;

● information with respect to book-entry procedures, if any;

● the anti-dilution provisions of the warrants, if any;

● any redemption or call provisions;

● whether the warrants are to be sold separately or with other securities as parts of units; and

● any additional terms of the warrants, including terms, procedures and limitations relating to the exchange and exercise of the warrants.

Each warrant will entitle its holder to purchase the principal amount of debt securities or the number of shares of preferred stock or common stock at the exercise price set forth in, or calculable as set forth in, the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, holders of the warrants may exercise the warrants at any time up to the specified time on the expiration date that we set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void.

A holder of warrant certificates may exchange them for new warrant certificates of different denominations, present them for registration of transfer and exercise them at the corporate office of the transfer agent or any other office indicated in the applicable prospectus supplement. Until any warrants to purchase debt securities are exercised, the holder of the warrants will not have any rights of holders of the debt securities that can be purchased upon exercise, including any rights to receive payments of principal, premium or interest on the underlying debt securities or to enforce covenants in the applicable indenture. Until any warrants to purchase common stock or preferred stock are exercised, the holders of the warrants will not have any rights of holders of the underlying common stock or preferred stock, including any rights to receive dividends or payments upon any liquidation, dissolution or winding up on the common stock or preferred stock, if any.

**Transfer Agent and Registrar**

The transfer agent and registrar for any warrants will be set forth in the applicable prospectus supplement.

**DESCRIPTION OF DEBT SECURITIES**

We may issue debt securities from time to time, in one or more series, as either senior or subordinated debt or as senior or subordinated convertible debt. While the terms we have summarized below will apply generally to any debt securities that we may offer under this prospectus, we will describe the particular terms of any debt securities that we may offer in more detail in the applicable prospectus supplement. The terms of any debt securities offered under a prospectus supplement may differ from the terms described below. Unless the context requires otherwise, whenever we refer to the indenture, we also are referring to any supplemental indentures that specify the terms of a particular series of debt securities.

We will issue the debt securities under the indenture that we will enter into with the trustee named in the indenture. The indenture will be qualified under the Trust Indenture Act of 1939, as amended (the "Trust Indenture Act"). We have filed the form of indenture as an exhibit to the registration statement of which this prospectus is a part, and supplemental indentures and forms of debt securities containing the terms of the debt securities being offered will be filed as exhibits to the registration statement of which this prospectus is a part or will be incorporated by reference from reports that we file with the SEC.

The following summary of material provisions of the debt securities and the indenture is subject to, and qualified in its entirety by reference to, all of the provisions of the indenture applicable to a particular series of debt securities. We urge you to read the applicable prospectus supplements and any related free writing prospectuses related to the debt securities that we may offer under this prospectus, as well as the complete indenture that contains the terms of the debt securities.

**General**

The indenture does not limit the amount of debt securities that we may issue. It provides that we may issue debt securities up to the principal amount that we may authorize and may be in any currency or currency unit that we may designate. Except for the limitations on consolidation, merger, and sale of all or substantially all of our assets contained in the indenture, the terms of the indenture do not contain any covenants or other provisions designed to give holders of any debt securities protection against changes in our operations, financial condition or transactions involving us.

We may issue the debt securities issued under the indenture as "discount securities," which means they may be sold at a discount below their stated principal amount. These debt securities, as well as other debt securities that are not issued at a discount, may be issued with "original issue discount," or OID, for U.S. federal income tax purposes because of interest payment and other characteristics or terms of the debt securities. Material U.S. federal income tax considerations applicable to debt securities issued with OID will be described in more detail in any applicable prospectus supplement.

We will describe in the applicable prospectus supplement the terms of the series of debt securities being offered, including:

● the title of the series of debt securities ;

● any limit upon the aggregate principal amount that may be issued ;

● the maturity date or dates ;

● the form of the debt securities of the series ;

● the applicability of any guarantees ;

● whether or not the debt securities will be secured or unsecured, and the terms of any secured debt ;

● whether the debt securities rank as senior debt, senior subordinated debt, subordinated debt or any combination thereof, and the terms of any subordination ;

● if the price (expressed as a percentage of the aggregate principal amount thereof) at which such debt securities will be issued is a price other than the principal amount thereof, the portion of the principal amount thereof payable upon declaration of acceleration of the maturity thereof, or if applicable, the portion of the principal amount of such debt securities that is convertible into another security or the method by which any such portion shall be determined ;

● the interest rate or rates, which may be fixed or variable, or the method for determining the rate and the date interest will begin to accrue, the dates interest will be payable and the regular record dates for interest payment dates or the method for determining such dates ;

● our right, if any, to defer payment of interest and the maximum length of any such deferral period ;

● if applicable, the date or dates after which, or the period or periods during which, and the price or prices at which, we may, at our option, redeem the series of debt securities pursuant to any optional or provisional redemption provisions and the terms of those redemption provisions ;

● the date or dates, if any, on which, and the price or prices at which we are obligated, pursuant to any mandatory sinking fund or analogous fund provisions or otherwise, to redeem, or at the holder's option to purchase, the series of debt securities and the currency or currency unit in which the debt securities are payable ;

● the denominations in which we will issue the series of debt securities, if other than denominations of $1,000 and any integral multiple thereof ;

● any and all terms, if applicable, relating to any auction or remarketing of the debt securities of that series and any security for our obligations with respect to such debt securities and any other terms which may be advisable in connection with the marketing of debt securities of that series ;

● whether the debt securities of the series shall be issued in whole or in part in the form of a global security or securities; the terms and conditions, if any, upon which such global security or securities may be exchanged in whole or in part for other individual securities; and the depositary for such global security or securities ;

● if applicable, the provisions relating to conversion or exchange of any debt securities of the series and the terms and conditions upon which such debt securities will be so convertible or exchangeable, including the conversion or exchange price, as applicable, or how it will be calculated and may be adjusted, any mandatory or optional (at our option or the holders' option) conversion or exchange features, the applicable conversion or exchange period and the manner of settlement for any conversion or exchange ;

● if other than the full principal amount thereof, the portion of the principal amount of debt securities of the series which shall be payable upon declaration of acceleration of the maturity thereof ;

● additions to or changes in the covenants applicable to the particular debt securities being issued, including, among others, the consolidation, merger or sale covenant ;

● additions to or changes in the events of default with respect to the securities and any change in the right of the trustee or the holders to declare the principal, premium, if any, and interest, if any, with respect to such securities to be due and payable ;

● additions to or changes in or deletions of the provisions relating to covenant defeasance and legal defeasance ;

● additions to or changes in the provisions relating to satisfaction and discharge of the indenture ;

● additions to or changes in the provisions relating to the modification of the indenture both with and without the consent of holders of debt securities issued under the indenture ;

● the currency of payment of debt securities if other than U.S. dollars and the manner of determining the equivalent amount in U.S. dollars;

● whether interest will be payable in cash or additional debt securities at our or the holders' option and the terms and conditions upon which the election may be made;

● the terms and conditions, if any, upon which we will pay amounts in addition to the stated interest, premium, if any, and principal amounts of the debt securities of the series to any holder that is not a "United States person" for federal tax purposes;

● any restrictions on transfer, sale or assignment of the debt securities of the series; and

● any other specific terms, preferences, rights or limitations of, or restrictions on, the debt securities, any other additions or changes in the provisions of the indenture, and any terms that may be required by us or advisable under applicable laws or regulations.

**Conversion or Exchange Rights**

We will set forth in the applicable prospectus supplement the terms on which a series of debt securities may be convertible into or exchangeable for our common stock or our other securities. We will include provisions as to settlement upon conversion or exchange and whether conversion or exchange is mandatory, at the option of the holder or at our option. We may include provisions pursuant to which the number of shares of our common stock or our other securities that the holders of the series of debt securities receive would be subject to adjustment.

**Consolidation, Merger or Sale**

Unless we provide otherwise in the prospectus supplement applicable to a particular series of debt securities, the indenture will not contain any covenant that restricts our ability to merge or consolidate, or sell, convey, transfer, or otherwise dispose of our assets as an entirety or substantially as an entirety. However, any successor to or acquirer of such assets (other than a subsidiary of ours) must assume all of our obligations under the indenture or the debt securities, as appropriate.

**Events of Default under the Indenture**

Unless we provide otherwise in the prospectus supplement applicable to a particular series of debt securities, the following are events of default under the indenture with respect to any series of debt securities that we may issue:

● if we fail to pay any installment of interest on any series of debt securities, as and when the same shall become due and payable, and such default continues for a period of 90 days; provided, however, that a valid extension of an interest payment period by us in accordance with the terms of any indenture supplemental thereto shall not constitute a default in the payment of interest for this purpose;

● if we fail to pay the principal of, or premium, if any, on any series of debt securities as and when the same shall become due and payable whether at maturity, upon redemption, by declaration or otherwise, or in any payment required by any sinking or analogous fund established with respect to such series; provided, however, that a valid extension of the maturity of such debt securities in accordance with the terms of any indenture supplemental thereto shall not constitute a default in the payment of principal or premium, if any;

● if we fail to observe or perform any other covenant or agreement contained in the debt securities or the indenture, other than a covenant specifically relating to another series of debt securities, and our failure continues for 90 days after we receive written notice of such failure, requiring the same to be remedied and stating that such is a notice of default thereunder, from the trustee or holders of at least 25% in aggregate principal amount of the outstanding debt securities of the applicable series; and

● if specified events of bankruptcy, insolvency or reorganization occur.

If an event of default with respect to debt securities of any series occurs and is continuing, other than an event of default specified in the last bullet point above, the trustee or the holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series, by notice to us in writing, and to the trustee if notice is given by such holders, may declare the unpaid principal of, premium, if any, and accrued interest, if any, due and payable immediately. If an event of default specified in the last bullet point above occurs with respect to us, the principal amount of and accrued interest, if any, of each issue of debt securities then outstanding shall be due and payable without any notice or other action on the part of the trustee or any holder.

The holders of a majority in principal amount of the outstanding debt securities of an affected series may waive any default or event of default with respect to the series and its consequences, except defaults or events of default regarding payment of principal, premium, if any, or interest, unless we have cured the default or event of default in accordance with the indenture. Any waiver shall cure the default or event of default.

Subject to the terms of the indenture, if an event of default under an indenture shall occur and be continuing, the trustee will be under no obligation to exercise any of its rights or powers under such indenture at the request or direction of any of the holders of the applicable series of debt securities, unless such holders have offered the trustee reasonable indemnity. The holders of a majority in principal amount of the outstanding debt securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, or exercising any trust or power conferred on the trustee, with respect to the debt securities of that series, provided that:

● the direction so given by the holder is not in conflict with any law or the applicable indenture; and

● subject to its duties under the Trust Indenture Act, the trustee need not take any action that might involve it in personal liability or might be unduly prejudicial to the holders not involved in the proceeding.

A holder of the debt securities of any series will have the right to institute a proceeding under the indenture or to appoint a receiver or trustee, or to seek other remedies only if:

● the holder has given written notice to the trustee of a continuing event of default with respect to that series;

● the holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series have made written request;

● such holders have offered to the trustee indemnity satisfactory to it against the costs, expenses and liabilities to be incurred by the trustee in compliance with the request; and

● the trustee does not institute the proceeding, and does not receive from the holders of a majority in aggregate principal amount of the outstanding debt securities of that series other conflicting directions within 90 days after the notice, request and offer.

These limitations do not apply to a suit instituted by a holder of debt securities if we default in the payment of the principal, premium, if any, or interest on, the debt securities.

We will periodically file statements with the trustee regarding our compliance with specified covenants in the indenture.

**Modification of Indenture; Waiver**

We and the trustee may change an indenture without the consent of any holders with respect to specific matters:

● to cure any ambiguity, defect or inconsistency in the indenture or in the debt securities of any series;

● to comply with the provisions described above under "Description of Debt Securities—Consolidation, Merger or Sale";

● to provide for uncertificated debt securities in addition to or in place of certificated debt securities;

● to add to our covenants, restrictions, conditions or provisions such new covenants, restrictions, conditions or provisions for the benefit of the holders of all or any series of debt securities, to make the occurrence, or the occurrence and the continuance, of a default in any such additional covenants, restrictions, conditions or provisions an event of default or to surrender any right or power conferred upon us in the indenture;

● to add to, delete from or revise the conditions, limitations, and restrictions on the authorized amount, terms, or purposes of issue, authentication and delivery of debt securities, as set forth in the indenture;

● to make any change that does not adversely affect the interests of any holder of debt securities f any series in any material respect;

● to provide for the issuance of and establish the form and terms and conditions of the debt securities of any series as provided above under "Description of Debt Securities—General" to establish the form of any certifications required to be furnished pursuant to the terms of the indenture or any series of debt securities, or to add to the rights of the holders of any series of debt securities;

● to evidence and provide for the acceptance of appointment under the indenture by a successor trustee; or

● to comply with any requirements of the SEC in connection with the qualification of the indenture under the Trust Indenture Act.

In addition, under the indenture, the rights of holders of a series of debt securities may be changed by us and the trustee with the written consent of the holders of at least a majority in aggregate principal amount of the outstanding debt securities of each series that is affected. However, unless we provide otherwise in the prospectus supplement applicable to a particular series of debt securities, we and the trustee may make the following changes only with the consent of each holder of any outstanding debt securities affected:

● extending the fixed maturity of any debt securities of any series;

● reducing the principal amount, reducing the rate of or extending the time of payment of interest, or reducing any premium payable upon the redemption of any series of any debt securities; or

● reducing the percentage of debt securities, the holders of which are required to consent to any amendment, supplement, modification, or waiver.

**Discharge**

The indenture provides that we can elect to be discharged from our obligations with respect to one or more series of debt securities, except for specified obligations, including obligations to:

● provide for payment;

● register the transfer or exchange of debt securities of the series;

● replace stolen, lost or mutilated debt securities of the series;

● pay principal of and premium and interest on any debt securities of the series;

● maintain paying agencies;

● hold monies for payment in trust;

● recover excess money held by the trustee;

● compensate and indemnify the trustee; and

● appoint any successor trustee.

In order to exercise our rights to be discharged, we must deposit with the trustee money or government obligations sufficient to pay all the principal of, any premium, if any, and interest on, the debt securities of the series on the dates payments are due.

**Form, Exchange and Transfer**

We will issue the debt securities of each series only in fully registered form without coupons and, unless we provide otherwise in the applicable prospectus supplement, in denominations of $1,000 and any integral multiple thereof. The indenture provides that we may issue debt securities of a series in temporary or permanent global form and as book-entry securities that will be deposited with, or on behalf of, The Depository Trust Company (the "DTC"), or another depositary named by us and identified in the applicable prospectus supplement with respect to that series. To the extent the debt securities of a series are issued in global form and as book-entry, a description of terms relating to any book-entry securities will be set forth in the applicable prospectus supplement.

At the option of the holder, subject to the terms of the indenture and the limitations applicable to global securities described in the applicable prospectus supplement, the holder of the debt securities of any series can exchange the debt securities for other debt securities of the same series, in any authorized denomination and of like tenor and aggregate principal amount.

Subject to the terms of the indenture and the limitations applicable to global securities set forth in the applicable prospectus supplement, holders of the debt securities may present the debt securities for exchange or for registration of transfer, duly endorsed or with the form of transfer endorsed thereon duly executed if so required by us or the security registrar, at the office of the security registrar or at the office of any transfer agent designated by us for this purpose. Unless otherwise provided in the debt securities that the holder presents for transfer or exchange, we will impose no service charge for any registration of transfer or exchange, but we may require payment of any taxes or other governmental charges.

We will name in the applicable prospectus supplement the security registrar, and any transfer agent in addition to the security registrar, that we initially designate for any debt securities. We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer agent acts, except that we will be required to maintain a transfer agent in each place of payment for the debt securities of each series.

If we elect to redeem the debt securities of any series, we will not be required to:

● issue, register the transfer of, or exchange any debt securities of that series during a period beginning at the opening of business 15 days before the day of mailing of a notice of redemption of any debt securities that may be selected for redemption and ending at the close of business on the day of the mailing; or

● register the transfer or exchange of any debt securities so selected for redemption, in whole or in part, except the unredeemed portion of any debt securities we are redeeming in part.

**Information Concerning the Trustee**

The trustee, other than during the occurrence and continuance of an event of default under an indenture, undertakes to perform only those duties as are specifically set forth in the applicable indenture. Upon an event of default under an indenture, the trustee must use the same degree of care as a prudent person would exercise or use in the conduct of his or her own affairs. Subject to this provision, the trustee is under no obligation to exercise any of the powers given it by the indenture at the request of any holder of debt securities unless it is offered reasonable security and indemnity against the costs, expenses and liabilities that it might incur.

**Payment and Paying Agents**

Unless we otherwise indicate in the applicable prospectus supplement, we will make payment of the interest on any debt securities on any interest payment date to the person in whose name the debt securities, or one or more predecessor securities, are registered at the close of business on the regular record date for the interest.

We will pay principal of and any premium and interest on the debt securities of a particular series at the office of the paying agents designated by us, except that unless we otherwise indicate in the applicable prospectus supplement, we will make interest payments by check that we will mail to the holder or by wire transfer to certain holders. Unless we otherwise indicate in the applicable prospectus supplement, we will designate the corporate trust office of the trustee as our sole paying agent for payments with respect to debt securities of each series. We will name in the applicable prospectus supplement any other paying agents that we initially designate for the debt securities of a particular series. We will maintain a paying agent in each place of payment for the debt securities of a particular series.

All money we pay to a paying agent or the trustee for the payment of the principal of or any premium or interest on any debt securities that remains unclaimed at the end of two years after such principal, premium or interest has become due and payable will be repaid to us, and the holder of the debt security thereafter may look only to us for payment thereof.

**Governing Law**

The indenture and the debt securities will be governed by and construed in accordance with the internal laws of the State of New York, except to the extent that the Trust Indenture Act is applicable.

**DESCRIPTION OF UNITS**

We may issue units consisting of any combination of the other types of securities offered under this prospectus in one or more series. We may evidence each series of units by unit certificates that we will issue under a separate agreement. We may enter into unit agreements with a unit agent. Each unit agent will be a bank or trust company that we select. We will indicate the name and address of the unit agent in the applicable prospectus supplement relating to a particular series of units.

The following description, together with the additional information included in any applicable prospectus supplement, summarizes the general features of the units that we may offer under this prospectus. You should read any prospectus supplement and any free writing prospectus that we may authorize to be provided to you related to the series of units being offered, as well as the complete unit agreements that contain the terms of the units. Specific unit agreements will contain additional important terms and provisions and we will file as an exhibit to the registration statement of which this prospectus is a part, or will incorporate by reference from another report that we file with the SEC, the form of each unit agreement relating to units offered under this prospectus.

If we offer any units, certain terms of that series of units will be described in the applicable prospectus supplement, including, without limitation, the following, as applicable:

● the title of the series of units;

● identification and description of the separate constituent securities comprising the units;

● the price or prices at which the units will be issued;

● the date, if any, on and after which the constituent securities comprising the units will be separately transferable;

● a discussion of certain United States federal income tax considerations applicable to the units; and

● any other terms of the units and their constituent securities.

**WHERE YOU CAN FIND MORE INFORMATION**

We have filed with the SEC a registration statement on Form S-3 (the "Registration Statement," which term shall encompass all amendments, exhibits, annexes and schedules thereto and all documents incorporated by reference therein) pursuant to the Securities Act, and the rules and regulations promulgated thereunder, with respect to the securities offered hereby. This prospectus, which constitutes a part of the Registration Statement, does not contain all the information contained in the Registration Statement, parts of which are omitted in accordance with the rules and regulations of the SEC. For further information with respect to us and the securities offered hereby, reference is made to the Registration Statement.

We are required to file annual and quarterly reports, special reports, proxy statements, and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information regarding issuers, including us, that file electronically with the SEC. You may obtain documents that we file with the SEC at http://www.sec.gov. We also make these documents publicly available, free of charge, on our website at www.celcuity.com as soon as reasonably practicable after filing such documents with the SEC. Please note, however, that information on, or accessible through, our website is not, and should not be deemed to be, a part of this prospectus and should not be relied upon in connection with making any investment decision with respect to the offered securities.

**INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE**

The SEC allows us to "incorporate by reference" into this prospectus the information we file with it, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is considered to be part of this prospectus, and information in documents that we file later with the SEC will automatically update and supersede information in this prospectus. We incorporate by reference into this prospectus the documents listed below and any future filings made by us with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act until we close this offering, including all filings made after the date of the initial registration statement and prior to the effectiveness of the registration statement. We hereby incorporate by reference the following documents:

● Our Annual Report on [Form 10-K](https://www.sec.gov/Archives/edgar/data/1603454/000149315224011549/form10-k.htm) for the year ended December 31, 2023, filed on March 27, 2024;

● Our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2024 and June 30, 2024, filed on [May 15, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224019974/form10-q.htm) and [August 14, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224032372/form10-q.htm) , respectively;

● Our Current Reports on Form 8-K (excluding any reports or portions thereof that are deemed to be furnished and not filed) filed on [March 29, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224012030/form8-k.htm) , [May 13, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224018943/form8-k.htm) , [May 30, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224021864/form8-k.htm) and [May 31, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224022227/form8-k.htm) ;

● Our definitive Proxy Statements filed on [March 28, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224011792/formdef14a.htm) and [August 28, 2024](https://www.sec.gov/Archives/edgar/data/1603454/000149315224034185/formdef14a.htm) ; and

● The description of our common stock contained in our registration statement on [Form 8-A](https://www.sec.gov/Archives/edgar/data/1603454/000157104917007886/t1702579_8a.htm) filed September 15, 2017, under the Exchange Act, as updated by the description of our common stock contained in [Exhibit 4.2](https://www.sec.gov/Archives/edgar/data/1603454/000149315223011587/ex4-2.htm) to our Annual Report on Form 10-K for the year ended December 31, 2023, including any amendment or report filed for the purpose of updating such description.

Any statement contained in a document, all or a portion of which is incorporated or deemed to be incorporated by reference herein, will be deemed to be modified or superseded to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified will not be deemed to constitute a part hereof, except as so modified, and any statement so superseded will not be deemed to constitute a part hereof.

You may request a copy of these filings, at no cost, by writing or telephoning us at the following address:

Celcuity Inc.

16305 36th Avenue N., Suite 100

Minneapolis, MN 55446<br> Attention: Investor Relations<br> Phone: (763) 392-0123

Copies of these filings are also available, without charge, through the "Investors" section of our website (www.celcuity.com) as soon as reasonably practicable after they are filed electronically with the SEC. Please note, however, that information on our website is not, and should not be deemed to be, a part of this prospectus.

**LEGAL MATTERS**

Unless otherwise specified in a prospectus supplement accompanying this prospectus, the validity of the issuance of the securities offered hereby will be passed upon for us by Fredrikson & Byron, P.A., Minneapolis, Minnesota. Any underwriters or agents will also be advised about legal matters by their own counsel, which will be named in the prospectus supplement.

**EXPERTS**

The financial statements as of December 31, 2023 and December 31, 2022 and for the years ended December 31, 2023 and December 31, 2022, incorporated by reference in this prospectus have been so incorporated in reliance on the report of Boulay PLLP, an independent registered public accounting firm, incorporated by reference herein, given on the authority of said firm as experts in auditing and accounting.

![A close up of a logo AI-generated content may be incorrect.](form424b5_002.jpg)

**1,836,842 Shares of** **Common Stock**

**Pre-Funded Warrants to Purchase 400,000 Shares of Common Stock**

**PROSPECTUS SUPPLEMENT**

*Joint Book-Running Managers*

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| | | |
|:---|:---|:---|
| **Jefferies** | **TD Cowen** | **Leerink Partners** |

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*Passive Bookrunner*

 

**LifeSci Capital**

July 30, 2025