Sean Brynjelsen - 19 Aug 2026 Form 4 Insider Report for Eton Pharmaceuticals, Inc. (ETON)

Reporting relationship: President & CEO, Director
Issuer ticker: ETON
Reported as of: 19 Aug 2026
Net transaction value: -$6,087,773
SEC form: 4
Accepted by SEC: 20 Aug 2026, 18:26:19 UTC
Prior SEC filing: 04 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Judith Matthews

Key filing fact

Sean Brynjelsen filed Form 4 for Eton Pharmaceuticals, Inc. (ETON) on 20 Aug 2026.

Key facts

This page summarizes Sean Brynjelsen's Form 4 filing for Eton Pharmaceuticals, Inc. (ETON).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 20 Aug 2026, 18:26.

Change

Previous filing in this sequence was filed on 04 Aug 2026.
Current net transaction value: -$6,087,773.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001669976 Primary reporting owner

BRYNJELSEN SEAN

Relationship: President & CEO, Director
Address: C/O ETON PHARMACEUTICALS, INC., 21925 W. FIELD PARKWAY, SUITE 235, DEERPARK
Signature: /s/ Judith Matthews
Signature date: 20 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ETON transaction

Common Stock

Sale

Transaction value: $562,472
Shares: -8,978
Change %: -0.85%
Price: $62.65
Shares after: 1,052,216
Date: 19 Aug 2026
Ownership: Direct
Footnotes: F1, F2

ETON transaction

Common Stock

Sale

Transaction value: $2,846,462
Shares: -47,307
Change %: -4.5%
Price: $60.17
Shares after: 1,004,909
Date: 20 Aug 2026
Ownership: Direct
Footnotes: F2, F3

ETON transaction

Common Stock

Sale

Transaction value: $2,222,754
Shares: -36,373
Change %: -3.6%
Price: $61.11
Shares after: 968,536
Date: 20 Aug 2026
Ownership: Direct
Footnotes: F2, F4

ETON transaction

Common Stock

Sale

Transaction value: $456,085
Shares: -7,342
Change %: -0.76%
Price: $62.12
Shares after: 961,194
Date: 20 Aug 2026
Ownership: Direct
Footnotes: F2, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

The shares were sold in multiple trades at prices ranging from $62.50 to $63.41. The price above reflects the weighted average sales price.

Footnote F2

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 sold at each separate price.

Footnote F3

The shares were sold in multiple trades at prices ranging from $59.59 to $60.59. The price above reflects the weighted average sales price.

Footnote F4

The shares were sold in multiple trades at prices ranging from $60.61 to $61.61. The price above reflects the weighted average sales price.

Footnote F5

The shares were sold in multiple trades at prices ranging from $61.63 to $62.52. The price above reflects the weighted average sales price.