Eton Pharmaceuticals, Inc. (ETON) Insider Ownership

Historic Insider Ownership Trends

As of May 14, 2026, Eton Pharmaceuticals's top three insider holders are Sean Brynjelsen (President Ceo, 2.89Mn shares), Management Inc. Opaleye (TenPercentOwner, 2.85Mn shares), David Krempa (Chief Business Officer, 630.24K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Sean Brynjelsen President Ceo 2,889,266 0 14 Jan, 2026
Management Inc. Opaleye - 0 2,855,000 12 Jun, 2025
David Krempa Chief Business Officer 630,238 0 14 Jan, 2026
David Krempa Chief Business Officer 630,238 0 14 Jan, 2026
James R. Gruber Chief Financial Officer 213,420 0 14 Jan, 2026
James R. Gruber Chief Financial Officer 213,420 0 14 Jan, 2026
Management Inc. Opaleye - 0 85,000 17 Nov, 2021
Management Inc. Opaleye - 0 82,070 08 Oct, 2024
Norbert G Riedel - 67,155 0 22 Apr, 2026
Norbert G Riedel - 35,000 0 05 Feb, 2026
William Wilson Troutman Cfo, Treasurer Secretary 23,027 0 20 Aug, 2021
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
21 Apr, 2026 Norbert G Riedel Common Stock A 12,500 $7.31 47,500 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 12,500 $7.31 47,500 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 12,500 $7.31 47,500 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 12,500 $7.31 47,500 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 12,500 $7.31 47,500 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 19,655 $8.61 67,155 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 19,655 $8.61 67,155 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 19,655 $8.61 67,155 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 19,655 $8.61 67,155 D M
21 Apr, 2026 Norbert G Riedel Common Stock A 19,655 $8.61 67,155 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 12,500 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 12,500 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 12,500 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 12,500 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 12,500 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 19,655 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 19,655 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 19,655 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 19,655 $0.00 0 D M
21 Apr, 2026 Norbert G Riedel Employee Stock Option (Right to Buy) D 19,655 $0.00 0 D M