X0306 4 2021-05-18 0 0001020214 CERUS CORP CERS 0001323113 Swisher Daniel N JR C/O CERUS CORPORATION 1220 CONCORD AVE CONCORD CA 94520 1 0 0 0 Common Stock 2021-05-18 4 M 0 5000 2.90 A 64868 D Common Stock 2021-05-18 4 S 0 5000 5.747 D 59868 D Option (Right to Buy) 2.90 2021-05-18 4 M 0 5000 D 2021-06-26 Common Stock 5000 0 D This transaction was executed pursuant to a 10b5-1 plan. The reported price in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.69 to $5.821 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 option became exercisable in 12 equal monthly installments after the grant date. Not applicable. Daniel N. Swisher Jr. by Chrystal Menard, attorney-in-fact 2021-05-20