X0306 4 2021-09-14 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 2021-09-14 4 A 0 313 0.00 A 25480 D Common Stock 2021-09-14 4 F 0 156 146.35 D 25324 D Restricted Stock Units 2021-09-14 4 M 0 313 0.00 D Common Stock 313 941 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. 313 shares vested on September 14, 2021; 313 shares will will vest on the second anniversary date of the grant date, September 14, 2022; 314 shares will vest on the third anniversary date of the grant date, September 14, 2023; and 314 shares will vest on the fourth anniversary date of the grant date, September 14, 2024. Robert J. Bujarski 2021-09-16