Updated Jul 16, 2026
BRYNJELSEN SEAN has filed 2 SEC Form 4 filings across 1 company in the last 90 days — selling. Lifetime open-market sales: $3.83M.

Sean Brynjelsen is the President & Chief Executive Officer and a Director of Eton Pharmaceuticals, Inc., and is listed as a 10% owner in the company’s SEC filing dated January 14, 2026. Eton is a specialty pharmaceutical company focused on developing and commercializing therapies for rare diseases, including Alkindi Sprinkle, Carglumic Acid, Betaine Anhydrous, and Nitisinone. The SEC filing notes that Brynjelsen had no reported purchases or sales in that filing cycle.
| Role | President & CEO, Director |
|---|---|
| Notability | 25/100 |
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-07-14 | ETON | Eton Pharmaceuticals, Inc. | M — Option exercise | 200.0K | $1.37 | $274K |
| 2026-07-14 | ETON | Eton Pharmaceuticals, Inc. | M — Option exercise | 27.5K | — | |
| 2026-05-29 | ETON | Eton Pharmaceuticals, Inc. | S — Open-market sale | 148 | $32.67 | $5K |
| 2026-05-29 | ETON | Eton Pharmaceuticals, Inc. | S — Open-market sale | 119.9K | $31.88 | $3.82M |
| 2026-01-14 | ETON | Eton Pharmaceuticals, Inc. | F — Tax withholding / forfeiture | 5.0K | $15.39 | $77K |
Sean Brynjelsen is the President & Chief Executive Officer and a Director of Eton Pharmaceuticals, Inc., and is listed as a 10% owner in the company’s SEC filing dated January 14, 2026. Eton is a specialty pharmaceutical company focused on developing and commercializing therapies for rare diseases, including Alkindi Sprinkle, Carglumic Acid, Betaine Anhydrous, and Nitisinone. T…
2 primary Form 4 filings in the last 90 days, covering 1 company.
Recorded transactions: 0 open-market purchases () and 2 open-market sales ($3.83M) across all tracked filings.
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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