X0306 4/A 2019-03-10 2014-03-13 0 0001020214 CERUS CORP CERS 0001564252 Menard Chrystal C/O CERUS CORPORATION 2550 STANWELL DRIVE CONCORD CA 94520 0 1 0 0 Chief Legal Officer Common Stock 2019-03-10 4 M 0 5700 A 35411 D Common Stock 2019-03-12 4 S 0 1972 6.48 D 33439 D Common Stock 2019-03-12 4 M 0 7500 A 40939 D Common Stock 2019-03-13 4 S 0 2832 5.8996 D 38107 D Common Stock 2019-03-12 4 M 0 15834 A 53941 D Common Stock 2019-03-13 4 S 0 5979 5.90 D 47962 D Restricted Stock Unit 2019-03-10 4 M 0 5700 D Common Stock 5700 0 D Restricted Stock Unit 2019-03-12 4 M 0 7500 D Common Stock 7500 7500 D Restricted Stock Unit 2019-03-12 4 M 0 15834 D Common Stock 15834 31666 D Each restricted stock unit represents a contingent right to receive one (1) share of Cerus Common Stock. Includes 2,999 and 1,084 shares purchased under Issuer's Employee Stock Purchase Plan on 08/31/18 and 02/28/19, respectively. Represents the number of shares required to be sold to cover the statutory tax withholding obligations and corresponding brokerage fee in connection with the vesting of the restricted stock units listed in Table II. This sale is mandated by the election to satisfy the minimum statutory tax withholding obligations through a "sell to cover" transaction and does not represent a discretionary sale by the reporting person. The restricted stock unit vests in three equal annual installments beginning on March 10, 2017. Not applicable. The restricted stock unit vests in three equal annual installments beginning on March 12, 2018. The restricted stock unit vests in three equal annual installments beginning on March 12, 2019. Amended to correct Table I, Column 5 to include 3/10/19 release of 5,700 shares. Chrystal Menard 2019-03-14