144 0001669976 XXXXXXXX LIVE 0001710340 Eton Pharmaceuticals, Inc. 001-38738 21925 W. FIELD PARKWAY SUITE 235 DEER PARK IL 60010-7278 (847) 787-7361 BRYNJELSEN SEAN Director Common The Charles Schwab Corporation

3000 Schwab Way Westlake TX 76262

120000 3888000.00 27392358 05/28/2026 NASDAQ Common 05/17/2017 Founder Shares Issuer N 200000 05/17/2017 Grant Common 08/13/2019 Open Market Purchase Issuer N 5000 08/13/2019 Cash Common 06/03/2021 Open Market Purchase Issuer N 5000 06/03/2021 Cash Common 08/21/2021 Open Market Purchase Issuer N 10000 08/21/2021 Cash Y 05/28/2026 Sean Brynjelsen