X0306 4 2022-08-12 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 2022-08-12 4 F 0 16006 16.64 D 884466 D Restricted Stock Units Common Stock 34297 34297 D The reporting person has elected to satisfy his tax withholding obligation in connection with the vesting of prior restricted stock grants by directing the Company to withhold shares otherwise issuable upon vesting of the previously reported grants. 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. 2022-08-16