X0306 4 2022-02-07 0001180145 Cardiovascular Systems Inc CSII 0001174531 Ward Scott R. 1225 OLD HIGHWAY 8 NW ST. PAUL MN 55112 1 1 Chairman and CEO Common Stock 2022-02-07 4 P 0 2500 18.5172 A 572236 D Common Stock 2022-02-08 4 A 0 5477 0 A 577713 D Restricted Stock Units Common Stock 34297 34297 D The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $18.50 to $18.58 inclusive. The reporting person undertakes to provide Cardiovascular Systems, Inc., any security holder of Cardiovascular Systems, Inc., or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. Restrictions lapse as to 2,739 shares on 2/12/23 and as to 2,738 shares on 2/12/24. Each restricted stock unit represents the right to receive a payment from the Company equal in value to the market price per share of the Company's common stock on the date of payment and shall be payable in cash or shares of Company common stock beginning six months following the termination of the reporting person's board membership. /s/ Andrew Nick as Attorney-in-Fact for Scott R. Ward pursuant to Power of Attorney previously filed. 2022-02-09