Jeffrey del Carmen - 29 Dec 2025 Form 4 Insider Report for CATALYST PHARMACEUTICALS, INC. (CPRX)

Role: Chief Commercial Officer
Signature: /s/ Jeffrey Del Carmen
Issuer symbol: CPRX
Transactions as of: 29 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 30 Dec 2025, 17:00:15 UTC
Previous filing: 10 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Del Carmen Jeffrey	Chief Commercial Officer	355 ALHAMBRA CIRCLE, SUITE 801, CORAL GABLES	/s/ Jeffrey Del Carmen	30 Dec 2025	0001816477

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CPRX	Common Stock, par value $0.001 per share	Options Exercise		+8,667	+91%		18,176	29 Dec 2025	Direct	F1
transaction	CPRX	Common Stock, par value $0.001 per share	Tax liability		-3,839	-21%		14,337	29 Dec 2025	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	CPRX	Restricted Stock Units	Options Exercise	$0	-8,667	-0.83%	$0.000000	1,036,846	29 Dec 2025	Common Stock	8,667		Direct	F1, F3, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Each restricted stock unit represents a contingent right to receive one share of the Registrant's common stock upon vesting.
F2	Shares withheld by the Registrant to satisfy applicable withholding taxes upon vesting of restricted common stock.
F3	Derivative securities vested in equal tranches, 1/3rd on December 27, 2023, 1/3rd on December 27, 2024, and 1/3rd on December 27, 2025.
F4	Shares of common stock are required to be delivered to the Reporting Person within sixty days of vesting. The final tranche of shares was delivered on December 29, 2025.