X0306 4 2022-01-31 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 2022-02-01 4 A 0 1706 0.00 A 20613 D Common Stock 2022-02-01 4 F 0 590 102.32 D 20023 D Restricted Stock Units 2022-01-31 4 A 0 14512 0.00 A Common Stock 14512 14512 D Restricted Stock Units (Converted) 2022-01-31 4 A 0 1132 0.00 A Common Stock 1132 1132 D Restricted Stock Units (Premium) 2022-01-31 4 A 0 226 0.00 A Common Stock 226 226 D Restricted Stock Units 2022-02-01 4 M 0 1706 0.00 D Common Stock 1706 3412 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. 4,837 shares vest on the first anniversary date of the grant date, January 31, 2023; 4,837 shares vest on the second anniversary date of the grant date, January 31, 2024; and 4,838 shares vest on the third anniversary date of the grant date, January 31, 2025. The restricted stock units were received in lieu of cash payments to the reporting person under a deferred compensation program applicable to participating employees. Vested restricted stock units may be deferred, in which case, payment will occur according to the elected deferral schedule. The restricted stock units vest on January 31, 2022. The restricted stock units vest on January 31, 2023. One-third of the shares subject to the original grant vest annually over a three-year period, commencing on the first anniversary date of the grant date. Robert J. Bujarski, attorney-in-fact for Randall J. Steward 2022-02-02