X0306 4 2021-02-18 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 2021-02-18 4 A 0 4798 0.00 A 15113 D Common Stock 2021-02-18 4 F 0 2379 210.10 D 12734 D Common Stock 2021-02-18 4 A 0 4831 0.00 A 17565 D Common Stock 2021-02-18 4 F 0 2396 210.10 D 15169 D Reporting Person acquired these shares in connection with full achievement of performance metrics associated with performance-based restricted stock units awarded on 01/16/2018. 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 performance-based restricted stock units. Reporting Person acquired these shares in connection with full achievement of performance metrics associated with performance-based restricted stock units awarded on 02/04/2019. Robert J. Bujarski, attorney-in-fact for Randall J. Steward 2021-04-01