X0306 4 2018-03-10 0 0001020214 CERUS CORP CERS 0001459351 Green Kevin Dennis C/O CERUS CORPORATION 2550 STANWELL DRIVE CONCORD CA 94520 0 1 0 0 Chief Financial Officer Common Stock 2018-03-10 4 M 0 6000 A 58062 D Common Stock 2018-03-12 4 S 0 2063 4.8015 D 55999 D Common Stock 2018-03-12 4 M 0 7500 A 63499 D Common Stock 2018-03-13 4 S 0 2674 5.05 D 60825 D Restricted Stock Unit 2018-03-10 4 M 0 6000 D Common Stock 6000 6000 D Restricted Stock Unit 2018-03-12 4 M 0 7500 D Common Stock 7500 15000 D Each restricted stock unit represents a contingent right to receive one (1) share of Cerus Common Stock. 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 reported price in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.80 to $4.9652 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 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. Kevin D. Green by Chrystal Menard, attorney-in-fact 2018-03-13