Eton Pharmaceuticals's three largest insider shareholders as of September 09, 2026 are Management Inc. Opaleye (TenPercentOwner, 2.73Mn shares), Sean Brynjelsen (President Ceo, 961.19K shares), James R. Gruber (Chief Financial Officer, 213.42K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Management Inc. Opaleye | TenPercentOwner | 0 | 2,733,315 | 2,733,315 | 67.6% | 07 Jul, 2026 |
| 2 | Sean Brynjelsen | President Ceo | 961,194 | 0 | 961,194 | 23.8% | 20 Aug, 2026 |
| 3 | James R. Gruber | Chief Financial Officer | 213,420 | 0 | 213,420 | 5.3% | 14 Jan, 2026 |
| 4 | Paul V Maier | Director | 72,245 | 0 | 72,245 | 1.8% | 31 Aug, 2026 |
| 5 | David Krempa | Chief Business Officer | 37,025 | 0 | 37,025 | 0.9% | 24 Aug, 2026 |
| 6 | William Wilson Troutman | Cfo, Treasurer Secretary | 23,027 | 0 | 23,027 | 0.6% | 20 Aug, 2021 |
| 7 | Ipek Erdogan-Trinkaus | Chief Commercial Officer | 2,403 | 0 | 2,403 | 0.1% | 12 Dec, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 28 Aug, 2026 | Paul V Maier | Director | Acquired M | 50,000 | $3.78 | $189.00K | 109,745 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed S | 36,387 | $58.64 | $2.13Mn | 73,358 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed S | 13,485 | $60.21 | $811.93K | 59,873 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed S | 128 | $61.77 | $7.91K | 59,745 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Acquired M | 12,500 | $7.31 | $91.38K | 72,245 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed M | 50,000 | $0.00 | $0 | 0 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Acquired M | 12,500 | $0.00 | $0 | 0 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Acquired M | 50,000 | $3.78 | $189.00K | 109,745 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed S | 36,387 | $58.64 | $2.13Mn | 73,358 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed S | 13,485 | $60.21 | $811.93K | 59,873 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed S | 128 | $61.77 | $7.91K | 59,745 | Direct |
| 28 Aug, 2026 | Paul V Maier | Director | Disposed M | 50,000 | $0.00 | $0 | 0 | Direct |
| 24 Aug, 2026 | David Krempa | Chief Business Officer | Acquired M | 25,000 | $7.31 | $182.75K | 62,025 | Direct |
| 24 Aug, 2026 | David Krempa | Chief Business Officer | Disposed S | 25,000 | $65.07 | $1.63Mn | 37,025 | Direct |
| 24 Aug, 2026 | David Krempa | Chief Business Officer | Disposed M | 25,000 | $0.00 | $0 | 70,000 | Direct |
| 19 Aug, 2026 | Sean Brynjelsen | President Ceo | Disposed S | 8,978 | $62.65 | $562.47K | 1,052,216 | Direct |
| 20 Aug, 2026 | Sean Brynjelsen | President Ceo | Disposed S | 47,307 | $60.17 | $2.85Mn | 1,004,909 | Direct |
| 20 Aug, 2026 | Sean Brynjelsen | President Ceo | Disposed S | 36,373 | $61.11 | $2.22Mn | 968,536 | Direct |
| 20 Aug, 2026 | Sean Brynjelsen | President Ceo | Disposed S | 7,342 | $62.12 | $456.09K | 961,194 | Direct |
| 31 Jul, 2026 | Norbert G Riedel | Director | Acquired A | 10,000 | $0.00 | $0 | 10,000 | Direct |