# EDGAR Filing Document

**Accession Number:** 0001369568
**File Stem:** 0001193125-25-175477
**Filing Date:** 2025-8
**Character Count:** 10654
**Document Hash:** 76d950ba17edc40a76a62461393c5a7c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-175477.hdr.sgml**: 20250807

**ACCESSION NUMBER**: 0001193125-25-175477

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20250806

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20250807

**DATE AS OF CHANGE**: 20250807

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CATALYST PHARMACEUTICALS, INC.
- **CENTRAL INDEX KEY:** 0001369568
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-33057
- **FILM NUMBER:** 251194646

**BUSINESS ADDRESS:**
- **STREET 1:** 355 ALHAMBRA CIRCLE
- **STREET 2:** SUITE 801
- **CITY:** CORAL GABLES
- **STATE:** FL
- **ZIP:** 33134
- **BUSINESS PHONE:** (305) 529-2522

**MAIL ADDRESS:**
- **STREET 1:** 355 ALHAMBRA CIRCLE
- **STREET 2:** SUITE 801
- **CITY:** CORAL GABLES
- **STATE:** FL
- **ZIP:** 33134

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CATALYST PHARMACEUTICAL PARTNERS, INC.
- **DATE OF NAME CHANGE:** 20110215

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Catalyst Pharmaceutical Partners, Inc.
- **DATE OF NAME CHANGE:** 20060719

?xml version='1.0' encoding='ASCII'? 8-K

### 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): August 6, 2025

## CATALYST PHARMACEUTICALS, INC.

#### (Exact Name Of Registrant As Specified In Its Charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-33057** | **76-0837053** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission File**<br> **Number)** | **(I.R.S. Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **355 Alhambra Circle** |  |
| **Suite 801** |  |
| **Coral Gables, Florida** | **33134** |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

#### Registrant's telephone number, including area code: (305) 420-3200

#### Not Applicable

#### 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 CFR240.14d-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** | **Name of Exchange**<br> **on Which Registered** | **Ticker**<br> **Symbol** |
| Common Stock, par value $0.001 per share | NASDAQ Capital Market | CPRX |

---

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 8.01** | **Other Events**  |

---

On August 6, 2025, the Company issued a press release announcing that the National Comprehensive Cancer Network Clinical Practice Guidelines in Oncology for Small Cell Lung Cancer now include new additions involving Lambert Eaton myasthenic syndrome, amifampridine, and the tests for PQ- and N-type voltage-gated calcium channel antibodies.

A copy of the press release is attached hereto as Exhibit 99.1.

---

| | |
|:---|:---|
| **Item 9.01** | **Financial Statements and Exhibits.**  |

---

(d) <u>Exhibits</u> 

---

| | |
|:---|:---|
| 99.1 | [Press release issued by the Company on August 6, 2025.](d55613dex991.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

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#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

---

| | |
|:---|:---|
| **Catalyst Pharmaceuticals, Inc.** | **Catalyst Pharmaceuticals, Inc.** |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/ Michael W. Kalb |
|  | Michael W. Kalb |
|  | Executive Vice President and Chief Financial Officer |

---

Dated: August 7, 2025

## Exhibit 99.1

**Exhibit 99.1** 

**Lambert Eaton Myasthenic Syndrome (LEMS) Antibody Testing and Treatment Recommendations Added to NCCN Clinical Practice Guidelines for Small Cell Lung Cancer (SCLC)** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• *VGCC antibody testing in conjunction with neurologic consultation can diagnose LEMS* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• *Amifampridine may be considered as a supportive care treatment* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• *Guideline inclusion may raise clinical awareness of cancer-associated LEMS to support broader VGCC diagnostic testing and treatment adoption* 

**CORAL GABLES, Fla., Aug. 06, 2025** – Catalyst Pharmaceuticals, Inc. ("Catalyst" or "Company") (Nasdaq: CPRX), a commercial-stage biopharmaceutical company focused on in-licensing, developing, and commercializing novel medicines for patients living with rare and difficult-to-treat diseases, today announced the National Comprehensive Cancer Network<sup>®</sup> (NCCN) Clinical Practice Guidelines in Oncology (NCCN Guidelines<sup>®</sup>) for Small Cell Lung Cancer (SCLC) now include new additions involving Lambert Eaton myasthenic syndrome (LEMS), amifampridine (FIRDAPSE<sup>®</sup>), and the tests for PQ- and N-type voltage-gated calcium channel (VGCC) antibodies.

The updated NCCN Clinical Practice Guidelines in Oncology for SCLC relating to LEMS now include symptom specificity—characterized by proximal muscle weakness and autonomic dysfunction. Under "Signs and Symptoms of Small Cell Lung Cancer" (SCL-A 2 of 2), the guidelines recommend diagnosis through a neurological evaluation, ideally in consultation with a neurologist, which may include testing for PQ- and N-type VGCC antibodies. Additionally, under "Principles of Supportive Care" (SCL-D), the guidelines recommend that amifampridine should be considered as a treatment in consultation with neurology.<sup>1</sup>

Approximately 50 percent of LEMS cases are associated with an underlying malignancy, most commonly SCLC. Literature suggests that LEMS is observed in 3 percent of SCLC patients. Based on an internal healthcare database analysis of SCLC claims, potentially 90 percent of LEMS patients with SCLC went undiagnosed. These undiagnosed LEMS patients may suffer from LEMS symptoms while undergoing treatment for SCLC.

"Early diagnosis of LEMS in SCLC is critical, as it may enable patients to have better outcomes if their LEMS symptoms are effectively treated while fighting SCLC. Accurate identification through VGCC antibody testing and comprehensive neurological evaluation is essential," said William Andrews, MD, FACP, Chief Medical Officer, Catalyst. "The NCCN Guidelines are a trusted standard for guiding treatment decisions, and we believe this update will drive greater awareness. Ultimately, it will help patients, caregivers, and healthcare providers make more informed choices when addressing this serious unmet need."

<sup>1</sup>NCCN makes no warranties of any kind whatsoever regarding their content, use or application and disclaims any responsibility for their application or use in any way. To learn more about NCCN go to <u>https://www.nccn.org/home/about</u>

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**About Catalyst Pharmaceuticals** 

Catalyst Pharmaceuticals, Inc. (Nasdaq: CPRX), is a biopharmaceutical company committed to improving the lives of patients with rare diseases. With a proven track record of bringing life-changing treatments to the market, we focus on in-licensing, commercializing, and developing innovative therapies. Guided by our deep commitment to patient care, we prioritize accessibility, ensuring patients receive the care they need through a comprehensive suite of support services designed to provide seamless access and ongoing assistance. Catalyst maintains a well-established U.S. presence, which remains the cornerstone of our commercial strategy, while continuously evaluating strategic opportunities to expand our global footprint. Catalyst, headquartered in Coral Gables, Fla., was recognized on the Forbes 2025 list as one of America's Most Successful Mid-Cap Companies and on the 2024 Deloitte Technology Fast 500<sup>™</sup> list as one of North America's Fastest-Growing Companies.

For more information, please visit Catalyst's website at <u>www.catalystpharma.com</u>.

**Forward-Looking Statements** 

This press release contains forward-looking statements, as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements involve known and unknown risks and uncertainties, which may cause Catalyst's actual results in future periods to differ materially from forecasted results. A number of factors, including those factors described in Catalyst's Annual Report on Form 10-K for the fiscal year 2024 and its subsequent filings with the U.S. Securities and Exchange Commission ("SEC"), could adversely affect Catalyst. Copies of Catalyst's filings with the SEC are available from the SEC, may be found on Catalyst's website, or may be obtained upon request from Catalyst. Catalyst does not undertake any obligation to update the information contained herein, which speaks only as of this date.

Source: Catalyst Pharmaceuticals, Inc.

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**Investor Contact** 

Mary Coleman, Catalyst Pharmaceuticals, Inc.

(305) 420-3200

<u>ir@catalystpharma.com</u> 

**Media Contact** 

David Schull, Russo Partners

(858) 717-2310

<u>david.schull@russopartnersllc.com</u>