X0206 3 2018-11-09 0 0001710340 Eton Pharmaceuticals, Inc. ETON 0001161662 RIEDEL NORBERT G 21925 W FIELD PARKWAY, SUITE 235 DEER PARK IL 60010 1 0 0 0 Common Stock 54745 D Restricted Stock Units 0.00 Common Stock 25000 D Each restricted stock unit represents a contingent right to receive one share of ETON common stock. The restricted stock units vested in four equal quarterly installments at the end of each quarter and were fully vested on June 30, 2018. Per the terms of the RSU award agreement, the shares will be delivered to the reporting person 30 days after retiring from service as a director. /s/ W. Wilson Troutman, Attorney-in-fact 2018-11-09