X0306 4 2021-08-24 0 0000353569 QUIDEL CORP /DE/ QDEL 0001067586 STEWARD RANDALL J 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 Chief Financial Officer Common Stock 2021-08-24 4 A 0 292 0.00 A 15461 D Common Stock 2021-08-24 4 F 0 145 121.80 D 15316 D Restricted Stock Units 2021-08-24 4 M 0 292 0.00 D Common Stock 292 584 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. Each restricted stock unit represents the right to receive one (1) share of Quidel Corporation common stock. 292 shares vested on August 24, 2021; 292 shares will vest on August 24, 2022; and 292 shares will vest on August 24, 2023. Robert J. Bujarski, attorney-in-fact for Randall J. Steward 2021-08-26