X0306 4 2021-11-18 0 0000353569 QUIDEL CORP /DE/ QDEL 0001333458 Bujarski Robert Joseph 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 Chief Operating Officer Common Stock 2021-11-18 4 A 0 1033 0.00 A 26357 D Common Stock 2021-11-18 4 F 0 513 144.71 D 25844 D Restricted Stock Units 2021-11-18 4 M 0 1033 0.00 D Common Stock 1033 1033 D Reflects release of restricted stock units that were previously reported on a Form 4. Disposition of shares, as set forth above, was in connection with the Issuer's withholding of common shares to satisfy tax withholding obligations related to the issuance of common shares upon release of restricted stock units. Restricted stock units convert into common stock on a one-for-one basis. 1,034 shares vested on the first anniversary date of the grant date, November 18, 2020. 1,033 shares vested on the second anniversary date of the grant date, November 18, 2021. 1,033 shares will vest on the third anniversary date of the grant date, November 18, 2022. Robert J. Bujarski 2021-11-22