X0306 4 2022-03-12 0 0001020214 CERUS CORP CERS 0001193209 CORASH LAURENCE M C/O CERUS CORPORATION 1220 CONCORD AVE SUITE 600 CONCORD CA 94520 0 1 0 0 Chief Scientific Officer Common Stock 2022-03-12 4 M 0 45000 A 2117586 D Common Stock 2022-03-14 4 S 0 16152 5.0396 D 2101434 D Common Stock 2022-03-12 4 M 0 22770 A 2124204 D Common Stock 2022-03-14 4 S 0 8173 5.0396 D 2116031 D Common Stock 2022-03-12 4 M 0 16667 A 2132698 D Common Stock 2022-03-14 4 S 0 5982 5.0396 D 2126716 D Restricted Stock Unit 2022-03-12 4 M 0 45000 D Common Stock 45000 0 D Restricted Stock Unit 2022-03-12 4 M 0 22770 D Common Stock 22770 23460 D Restricted Stock Unit 2022-03-12 4 M 0 16667 D Common Stock 16667 33333 D Each restricted stock unit represents a contingent right to receive one (1) share of Cerus Common Stock. Represents shares sold pursuant to an instruction intended to comply with the requirements of Rule 10b5-1 that was elected by the Reporting Person on the date of grant to cover statutory tax withholding obligations and corresponding brokerage fee in connection with the vesting of the restricted stock units listed in Table II and does not represent a discretionary sale by the reporting person. The reported price in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.871 to $5.22 per share, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the aforementioned range set forth. The restricted stock unit vests 33% on March 12, 2020, 33% on March 12, 2021 and 34% on March 12, 2022. Not applicable. The restricted stock unit vests 33% on March 12, 2021, 33% on March 12, 2022 and 34% on March 12, 2023. The restricted stock unit vests in three equal annual installments beginning on March 12, 2022. Laurence M. Corash, by Chrystal Menard, attorney-in-fact 2022-03-15