# EDGAR Filing Document

**Accession Number:** 0001574235
**File Stem:** 0001493152-26-023367
**Filing Date:** 2026-5
**Character Count:** 21115
**Document Hash:** 15655e9376f8a6b8fb8406e795bb1b1c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001493152-26-023367.hdr.sgml**: 20260515

**ACCESSION NUMBER**: 0001493152-26-023367

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260515

**ITEM INFORMATION**: Results of Operations and Financial Condition

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260515

**DATE AS OF CHANGE**: 20260515

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Pulmatrix, Inc.
- **CENTRAL INDEX KEY:** 0001574235
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 461821392
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-36199
- **FILM NUMBER:** 26982502

**BUSINESS ADDRESS:**
- **STREET 1:** 945 CONCORD STREET
- **STREET 2:** SUITE 1217
- **CITY:** FRAMINGHAM
- **STATE:** MA
- **ZIP:** 01701
- **BUSINESS PHONE:** (888) 355-4440

**MAIL ADDRESS:**
- **STREET 1:** 945 CONCORD STREET
- **STREET 2:** SUITE 1217
- **CITY:** FRAMINGHAM
- **STATE:** MA
- **ZIP:** 01701

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Ruthigen, Inc.
- **DATE OF NAME CHANGE:** 20130411

?xml version='1.0' encoding='ASCII'?

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**WASHINGTON, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the**

**Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): May 15, 2026**

**PULMATRIX, INC.**

**(Exact name of registrant as specified in its charter)**

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-36199** | **46-1821392** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

**945 Concord Street, Suite 1217**

**Framingham, MA 01701**

**(Address of principal executive offices) (Zip Code)**

**(888) 355-4440**

**(Registrant's telephone number, including area code)**

**N/A**

**(Former name or former address, if changed since last report)**

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4 (c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of exchange on which registered** |
| **Common Stock, par value $0.0001 per share** | **PULM** | **The NASDAQ Stock Market LLC** |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

**Item 2.02 Results of Operations and Financial Condition.**

On May 15, 2026, Pulmatrix, Inc. issued a press release announcing its financial results for the first fiscal quarter ended March 31, 2026, and provided a corporate update. A copy of the press release is furnished as Exhibit 99.1 hereto and is incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information in this Current Report on Form 8-K, including Exhibit 99.1, being furnished pursuant to Item 2.02, shall not be deemed to be "filed" for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

**Item 9.01 Financial Statements and Exhibits.**

(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 99.1 | [Press Release dated May 15, 2026\*](ex99-1.htm) |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL) |

---

\* This exhibit is furnished pursuant to Item 2.02 and shall not be deemed to be "filed."

**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **PULMATRIX, INC.** | **PULMATRIX, INC.** |
| Date: May 15, 2026 | By: | */s/ Peter Ludlum* |
|  |  | Peter Ludlum |
|  |  | Interim Chief Executive Officer and Interim Chief Financial Officer |

---

## Exhibit 99.1

**Exhibit 99.1**

![](ex99-1_001.jpg)

**Pulmatrix Announces First Quarter 2026 Financial Results**

 

*Announced merger agreement with Eos SENOLYTIX in March*

 

*Closed private placement of preferred stock*

 

Framingham, Mass., May 15, 2026 – Pulmatrix, Inc. ("Pulmatrix" or the "Company") (Nasdaq: PULM), a biopharmaceutical company that has focused on the development of novel inhaled therapeutic products intended to prevent and treat migraine and respiratory diseases with important unmet medical needs using its patented iSPERSE™ technology, today announced its first quarter financial results for 2026 and provided a corporate update.

Peter Ludlum, Interim Chief Executive Officer of Pulmatrix, commented, "Our focus in the first quarter was on our work to secure a strategic transaction for our company and our shareholders. We are pleased to report that on March 26<sup>th</sup> we announced entering into a merger agreement with Eos SENOLYTIX, a privately held biotechnology company developing novel gerotherapeutic peptides targeting mitochondrial dysfunction in aging-related diseases using its proprietary MitoXcel™ platform. We also secured aggregate gross proceeds of $1 million from a private placement of preferred stock from an affiliate of Eos. Separate from the preferred stock, our common stockholders will receive approximately 6% interest in the new combined company without dilution from the preferred stock."

***Proposed Merger with Eos SENOLYTIX***

As previously reported, on March 26, 2026, the Company entered into an agreement (the "Merger Agreement") and plan of merger (the "Merger") with Eos SENOLYTIX, Inc. ("Eos"). The proposed Merger is anticipated to close in the third quarter of 2026, subject to customary closing conditions. If the proposed Merger is completed, the business of Eos will continue as the business of the combined company.

In connection with the entry into the Merger Agreement, on March 26, 2026, the Company announced that it entered into a securities purchase agreement with an affiliate of Eos for the issuance and sale in a private placement of its newly designated Series B Convertible Preferred Stock, raising aggregate gross proceeds of $1.0 million.

Additional information about the Merger Agreement was previously disclosed on a Current Report on Form 8-K filed with the SEC on March 27, 2026.

 **

**Pulmatrix Seeks to Out-license or Monetize its Clinical Assets**

 

***iSPERSE™ Technology***

● iSPERSE™, also licensed to MannKind Corporation and Cipla Technologies for certain fields of use, utilizes particles that are engineered with a small, dense and dispersible profile to exceed the performance of traditional dry powder particles as the iSPERSE™ particles have the dispersibility advantages of porous engineered particles. Pulmatrix believes this results in superior drug delivery compared to traditional oral and injectable forms of treatment for certain diseases.

● As of March 31, 2026, Pulmatrix's patent portfolio related to iSPERSE™ included approximately 146 granted patents, 18 of which are U.S.-granted patents, plus approximately 48 pending patent applications in the U.S. and other jurisdictions.

 **

 ****

 

***PUR1900***

● PUR1900, has been approved to proceed to a Phase 3 in India conducted by our partner Cipla. This is the Company's inhaled iSPERSE™ formulation of the antifungal drug itraconazole being investigated for various indications. The Company and its partner, Cipla, wound down a Phase 2b trial that the Company was operating in 2024. Cipla has continued clinical development outside the United States, and in 2025 completed their Phase 2 study in India, published positive results and has been approved by India's Central Drug Standard Control Organization to proceed with a Phase 3 clinical trial, which Cipla currently expects to commence in 2026.

● Pulmatrix will receive 2% royalties on any potential future net sales by Cipla outside the United States should Cipla successfully market PUR1900 outside the United States. Within the United States, the Company and Cipla share the rights 50/50 and will seek to monetize PUR1900 for indications where an orally inhaled antifungal may provide a therapeutic benefit or fulfill an unmet medical need.

 ****

***PUR3100***

● PUR3100, a Phase 2-ready asset, is an orally inhaled dihydroergotamine ("DHE") engineered with Pulmatrix's iSPERSE™ dry powder inhalation technology for the treatment of acute migraine has a Food and Drug Administration acceptance of an Investigational New Drug ("IND") application for PUR3100 and receipt of a "study may proceed" letter to proceed with a Phase 2 study. The IND includes a Phase 2 clinical protocol where safety and preliminary efficacy of PUR3100 will be investigated in patients with acute migraine.

● The Phase 2 IND builds on the Phase 1 trial results of PUR3100, which were published in 2024 in the peer-reviewed publication, *Headache: The Journal of Head and Face Pain*. The study showed that PUR3100 achieved peak exposures in the targeted therapeutic range and time to maximum concentration occurred at five minutes after dosing at all dosing levels. The PUR3100 dose groups also showed a lower incidence of nausea and no vomiting compared to observations of nausea and vomiting in the intravenously ("IV") administered DHE dose group.

***PUR1800***

● PUR1800 is a Narrow Spectrum Kinase Inhibitor ("NSKI"), engineered with our iSPERSE™ technology, for the treatment of acute exacerbations in chronic obstructive pulmonary disease ("AECOPD"). In 2023, Pulmatrix presented complete results from a Phase 1b study of PUR1800 for AECOPD, indicating PUR1800 was well-tolerated with no observed safety signals. The topline data, along with the results from chronic toxicology studies, support the continued development of PUR1800 for the treatment of AECOPD and other inflammatory respiratory diseases.

● In 2024, Pulmatrix published an abstract titled "*Ex vivo* evaluation of the potential for Narrow Spectrum Kinase inhibitors as a treatment for Idiopathic Pulmonary Fibrosis".

**First Quarter 2026 Financial Results**

Research and development expenses were less than $0.1 million for both the three months ended March 31, 2026, and 2025. All clinical development is currently on hold while the Company works to license or monetize our clinical assets.

General and administrative expenses decreased approximately $0.5 million to $1.3 million for the three months ended March 31, 2026, compared to $1.8 million for the three months ended March 31, 2025. The decrease was primarily due to higher costs incurred in the three months ended March 31, 2025, related to the preparation and filing of a registration statement on Form S-4 and amendments thereto with the SEC.

The Company's total cash and cash equivalents balance as of March 31, 2026, was $3.3 million, compared to $4.1 million as of December 31, 2025. The Company's unaudited financial statements were prepared assuming that the Company will continue as a going concern within one year after the date such financial statements are issued. The Company anticipates that its cash position, based on current operational efficiencies and prioritization of spending, is sufficient to fund its operations at least through the anticipated closing of the proposed Merger with Eos.

**PULMATRIX, INC.**

**Consolidated Balance Sheets**

**(in thousands, except share and per share data)**

---

| | | |
|:---|:---|:---|
|  | **March 31,<br> 2026** | **December 31,<br> 2025** |
|  | **(unaudited)** | |
| **Assets** |  |  |
| Current assets: |  |  |
| &nbsp;&nbsp;&nbsp;Cash and cash equivalents | $3324 | $4088 |
| &nbsp;&nbsp;&nbsp;Restricted cash | 700 |  |
| &nbsp;&nbsp;&nbsp;Prepaid expenses and other current assets | 465 | 41 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total current assets | 4489 | 4129 |
| Long-term restricted cash | 7 | 10 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total assets | $4496 | $4139 |
| **Liabilities and stockholders' equity** |  |  |
| Current liabilities: |  |  |
| &nbsp;&nbsp;&nbsp;Accounts payable | $651 | $272 |
| &nbsp;&nbsp;&nbsp;Accrued expenses and other current liabilities | 254 | 57 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total current liabilities | 905 | 329 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total liabilities | 905 | 329 |
| Stockholders' equity: |  |  |
| &nbsp;&nbsp;&nbsp;Preferred Stock, $0.0001 par value — 500,000 shares authorized; 1,100 shares designated as Series B Convertible Preferred Stock; no shares issued and outstanding at March 31, 2026, and December 31, 2025; 1,000 shares of Series B Convertible Preferred Stock issuable at March 31, 2026 | 950 |  |
| &nbsp;&nbsp;&nbsp;Common stock, $0.0001 par value — 200,000,000 shares authorized; 3,652,285 shares issued and outstanding at March 31, 2026, and December 31, 2025 |  |  |
| &nbsp;&nbsp;&nbsp;Additional paid-in capital | 306131 | 306128 |
| &nbsp;&nbsp;&nbsp;Accumulated deficit | (303490) | (302318) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total stockholders' equity | 3591 | 3810 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total liabilities and stockholders' equity | $4496 | $4139 |

---

**PULMATRIX, INC.**

**Consolidated Statements of Operations**

**(in thousands, except share and per share data)**

**(unaudited)**

---

| | | |
|:---|:---|:---|
|  | **Three Months Ended March 31,** | **Three Months Ended March 31,** |
|  | **2026** | **2025** |
| **Operating expenses:** |  |  |
| &nbsp;&nbsp;&nbsp;Research and development | $3 | $19 |
| &nbsp;&nbsp;&nbsp;General and administrative | 1289 | 1828 |
| Total operating expenses | 1292 | 1847 |
| Loss from operations | (1292) | (1847) |
| **Other income (expense):** |  |  |
| &nbsp;&nbsp;&nbsp;Interest income | 12 | 53 |
| &nbsp;&nbsp;&nbsp;Fair value adjustment of warrants |  | 66 |
| &nbsp;&nbsp;&nbsp;Other income (expense), net | 108 | (80) |
| Total other income (expense), net | 120 | 39 |
| Net loss | $(1172) | $(1808) |
| Net loss per share attributable to common stockholders – basic and diluted | $(0.32) | $(0.50) |
| Weighted average common shares outstanding – basic and diluted | 3652285 | 3652285 |

---

**About Pulmatrix, Inc.**

Pulmatrix is a biopharmaceutical company that has focused on the development of novel inhaled therapeutic products intended to prevent and treat migraine and respiratory diseases with important unmet medical needs using its patented iSPERSE™ technology. The Company's proprietary product pipeline includes treatments for central nervous system ("CNS") disorders such as acute migraine and serious lung diseases such as Chronic Obstructive Pulmonary Disease ("COPD") and allergic bronchopulmonary aspergillosis ("ABPA"). Pulmatrix's product candidates are based on its proprietary engineered dry powder delivery platform, iSPERSE™, which seeks to improve therapeutic delivery to the lungs by optimizing pharmacokinetics and reducing systemic side effects to improve patient outcomes. For more on the Company's inhaled product candidates please visit:

<u>https://www.pulmatrix.com/pipeline.html</u>.

**About Eos SENOLYTIX, Inc.**

Eos SENOLYTIX is a biotechnology company focused on developing first-in-class gerotherapeutic peptide medicines that target the underlying biological mechanisms of aging. Eos's lead clinical candidates, PTC-2105 and PTC-2107, both proprietary MitoXcel™ geropeptides, have demonstrated the ability to rejuvenate naturally aged mice via two separate mechanisms, both via a single, aging-specific target, the mitochondrial membrane potential (MMP), also called the "Δψm". These two mechanisms include (1) the return of the efficiency of mitochondrial function in aging cells almost immediately back to their younger, more efficient phenotype, and (2) the profound elimination of senescent cells throughout every organ in the body, including the brain, reducing their negative systemic inflammatory effects. Extensive preclinical studies suggest the MitoXcel™ platform may be a broad gerotherapeutic that improves body composition, increasing lean muscle mass, and enhancing physical function in aging animals. By targeting fundamental processes driving aging and aging-related diseases, Eos SENOLYTIX is pursuing a unique therapeutic opportunity to intervene in the aging process in ways that were once thought impossible. Eos SENOLYTIX is headquartered in Houston, Texas and operates within the broader SENOTHERAPEUTIX / GEROTHERAPEUTIX group of longevity companies, which focuses on developing therapeutics targeting fundamental drivers of aging to improve healthspan and lifespan. For more information, visit <u>https://www.eossenolytix.com</u>.

**Forward-Looking Statements**

*Certain statements in this press release that are forward-looking and not statements of historical fact are forward-looking statements within the meaning of the federal securities laws. Such forward-looking statements include, but are not limited to, statements of historical fact and may be identified by words such as "anticipates," "assumes," "believes," "can," "could," "estimates," "expects," "forecasts," "guides," "intends," "is confident that," "may," "plans," "seeks," "projects," "targets," and "would," and their opposites and similar expressions are intended to identify forward-looking statements. Such forward-looking statements are based on the beliefs of management as well as assumptions made by and information currently available to management and include, but are not limited to, the use of proceeds from the private placement and conversion of the Series B Preferred Stock. Actual results could differ materially from those contemplated by the forward-looking statements as a result of certain factors, including, but not limited to, the consummation of any other potential reverse merger transaction in the future, among others; the Company's ability to divest its clinical assets on terms favorable to the Company, or at all, the Company's ability to maintain compliance with the listing standards of the Nasdaq Capital Market; the Company's ability to continue as a going concern, the Company's ability to conduct its business and raise capital in the future when needed; delays in planned clinical trials; the ability to establish that potential products are efficacious or safe in preclinical or clinical trials; the ability to establish or maintain collaborations on the development of therapeutic candidates; the ability to obtain appropriate or necessary governmental approvals to market potential products; the ability to obtain future funding for developmental products and working capital and to obtain such funding on commercially reasonable terms; the Company's ability to manufacture product candidates on a commercial scale or in collaborations with third parties; changes in the size and nature of competitors; the ability to retain key executives and scientists; the ability to secure and enforce legal rights related to the Company's products, including patent protection. A discussion of these and other factors, including risks and uncertainties with respect to the Company, including the proposed Merger with Cullgen, is set forth in the Company's filings with the Securities and Exchange Commission, including its most recent Annual Report on Form 10-K, as may be supplemented or amended by the Company's Quarterly Reports on Form 10-Q and Current Reports on Form 8-K. The Company disclaims any intention or obligation to revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.*

**Investor Contact:**

Chuck Padala

Managing Director

LifeSci Advisors

646-627-8390

<u>chuck@lifesciadvisors.com</u>