As of March 23, 2026, the three largest insider holders of ETON are Sean Brynjelsen (President Ceo, 2.89Mn shares), Health, Inc. Harrow (TenPercentOwner, 1.98Mn shares), David Krempa (Chief Business Officer, 630.24K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Sean Brynjelsen | President Ceo | 2,889,266 | 0 | 14 Jan, 2026 |
| Health, Inc. Harrow | 1,982,000 | 0 | 12 Apr, 2021 | |
| David Krempa | Chief Business Officer | 630,238 | 0 | 14 Jan, 2026 |
| James R. Gruber | Chief Financial Officer | 213,420 | 0 | 14 Jan, 2026 |
| Management Inc. Opaleye | 0 | 85,000 | 12 Jun, 2025 | |
| Norbert G Riedel | 35,000 | 0 | 05 Feb, 2026 | |
| William Wilson Troutman | Cfo, Treasurer Secretary | 23,027 | 0 | 20 Aug, 2021 |
| Ipek Erdogan-Trinkaus | Chief Commercial Officer | 2,403 | 0 | 12 Dec, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 03 Feb, 2026 | Norbert G Riedel | Common Stock | A | 30,000 | $4.42 | 35,000 | D | X |
| 03 Feb, 2026 | Norbert G Riedel | Employee Stock Option (Right to Buy) | D | 30,000 | $0.00 | 0 | D | X |
| 14 Jan, 2026 | James R. Gruber | Common Stock | D | 2,293 | $15.47 | 213,420 | D | F |
| 01 Jan, 2026 | Sean Brynjelsen | Common Stock | D | 5,015 | $15.39 | 2,889,266 | D | F |
| 14 Jan, 2026 | David Krempa | Common Stock | D | 1,942 | $15.62 | 630,238 | D | F |
| 12 Jan, 2026 | Ipek Erdogan-Trinkaus | Employee Stock Option (Right to Buy) | A | 40,655 | $0.00 | 123,878 | D | A |
| 12 Jan, 2026 | Paul V Maier | Employee Stock Option (Right to Buy) | A | 12,196 | $0.00 | 286,496 | D | A |
| 12 Jan, 2026 | Jennifer Mckie Adams | Employee Stock Option (Right to Buy) | A | 12,196 | $0.00 | 170,329 | D | A |
| 12 Jan, 2026 | Jennifer Mckie Adams | Restricted Stock Units | A | 7,757 | $0.00 | 178,086 | D | A |
| 12 Jan, 2026 | Paul V Maier | Restricted Stock Units | A | 7,757 | $0.00 | 294,253 | D | A |
| 12 Jan, 2026 | Sean Brynjelsen | Employee Stock Option (Right to Buy) | A | 158,046 | $0.00 | 3,047,312 | D | A |
| 12 Jan, 2026 | Ipek Erdogan-Trinkaus | Restricted Stock Units | A | 25,856 | $0.00 | 149,734 | D | A |
| 12 Jan, 2026 | James R. Gruber | Employee Stock Option (Right to Buy) | A | 40,655 | $0.00 | 254,075 | D | A |
| 12 Jan, 2026 | David Krempa | Employee Stock Option (Right to Buy) | A | 40,655 | $0.00 | 670,893 | D | A |
| 12 Jan, 2026 | Sean Brynjelsen | Restricted Stock Units | A | 100,517 | $0.00 | 3,147,829 | D | A |
| 12 Jan, 2026 | James R. Gruber | Restricted Stock Units | A | 25,856 | $0.00 | 279,931 | D | A |
| 12 Jan, 2026 | David Krempa | Restricted Stock Units | A | 25,856 | $0.00 | 696,749 | D | A |
| 12 Jan, 2026 | Norbert G Riedel | Employee Stock Option (Right to Buy) | A | 12,196 | $0.00 | 286,496 | D | A |
| 12 Jan, 2026 | Norbert G Riedel | Restricted Stock Units | A | 7,757 | $0.00 | 294,253 | D | A |
| 12 Dec, 2025 | David Krempa | Common Stock | D | 6,264 | $17.00 | 632,180 | D | F |