Ipek Erdogan-Trinkaus - 11 Dec 2025 Form 4 Insider Report for Eton Pharmaceuticals, Inc. (ETON)

Role: Chief Commercial Officer
Signature: /s/ James R. Gruber
Issuer symbol: ETON
Transactions as of: 11 Dec 2025
Net transactions value: -$1,436
Form type: 4
Filing time: 12 Dec 2025, 16:57:44 UTC
Previous filing: 09 Dec 2024
Next filing: 14 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Erdogan-Trinkaus Ipek	Chief Commercial Officer	C/O ETON PHARMACEUTICALS, INC., 21925 W. FIELD PARKWAY, SUITE 235, DEERPARK	/s/ James R. Gruber	12 Dec 2025	0002047026

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ETON	Common Stock	Tax liability	$1,436	-85	-3.4%	$16.90	2,403	12 Dec 2025	Direct	F1, F2, F3

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

Explanation of Responses:

Id	Content
F1	Shares withheld by the Issuer to satisfy applicable withholding taxes upon the vesting of restricted stock units.
F2	The shares were sold in multiple trades at prices ranging from $16.90 to $16.91. The price reported above reflects the weighted average sales price.
F3	The Reporting Person will provide upon request by the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.

Remarks:

The Reporting Person has authorized and designated the named person to file this Form 4 on the reporting person's behalf for indefinite duration.