X0306 4 2021-03-09 0 0001551693 Sientra, Inc. SIEN 0001810524 Bennett Oliver Christian 420 S. FAIRVIEW AVENUE, SUITE 200 SANTA BARBARA CA 93117 0 1 0 0 GC & Chief Compliance Officer Common Stock 2021-03-09 4 A 0 20000 0.00 A 242425 D Common Stock 2022-04-04 4 F 0 1807 2.17 D 240618 D Common Stock 2022-04-04 4 A 0 10000 0.00 A 250618 D Common Stock 2022-04-04 4 F 0 3615 2.17 D 247003 D Common Stock 2022-04-04 4 A 0 5000 0.00 A 252003 D Common Stock 2022-04-04 4 F 0 1807 2.17 D 250196 D Subject to the reporting person's continued employment, these shares will vest annually in four (4) equal installments, with the first vesting date being April 1, 2021. Withholding of shares to satisfy the Reporting Person's tax withholding obligation upon the vesting of Restricted Stock Units. Each restricted stock unit represents a contingent right to receive one (1) share of Common Stock of Sientra, Inc. Withholding of shares to satisfy the Reporting Person's tax withholding obligation upon the vesting of Performance Stock Units. /s/ Oliver Bennett 2022-04-06