X0306 4 2022-08-05 0001180145 Cardiovascular Systems Inc CSII 0001791906 Stenbeck Stephen 1225 OLD HIGHWAY 8 NW ST. PAUL MN 55112 1 Common Stock 3153 D Restricted Stock Units Common Stock 10636 10636 D Restricted Stock Units 2022-08-05 4 A 0 9064 0 A Common Stock 9064 9064 D Each restricted stock unit represents the right to receive a payment from the Company equal in value to the market price per share of Company 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. Each restricted stock unit represents the right to receive a payment from the Company equal in value to the market price per share of Company 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; provided, however, that the restricted stock units vest in quarterly amounts of 2,266 shares on each of September 30, 2022, December 31, 2022, March 31, 2023 and June 30, 2023. /s/ Andrew Nick as Attorney-in-Fact for Stephen Stenbeck pursuant to Power of Attorney previously filed. 2022-08-09