X0306 4/A 2020-02-16 2020-02-19 0 0000353569 QUIDEL CORP /DE/ QDEL 0001406652 BRYANT DOUGLAS C 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 1 1 0 0 President & CEO Common Stock 2020-02-16 4 F 0 8198 80.40 D 440823 D On February 19, 2020, the Reporting Person filed a Form 4 which reported the disposition of 8,606 shares in connection with the Issuer's withholding of common shares to satisfy tax withholding obligations related to the issuance of common shares upon the release of restricted stock units. Due to a clerical error, the number of shares reported as withheld was incorrectly calculated and reported. The correct amount of shares withheld was 8,198. Robert J. Bujarski, attorney-in-fact for Douglas C. Bryant 2020-02-24