X0306 4 2022-05-25 0 0000353569 QUIDEL CORP /DE/ QDEL 0001833942 Hodges Michelle A. 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 SVP, General Counsel Common Stock 2022-05-25 4 A 0 420 0.00 A 854 D Common Stock 2022-05-25 4 F 0 146 98.99 D 708 D Restricted Stock Units 2022-05-25 4 M 0 420 0.00 D Common Stock 420 1260 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. One-quarter of the shares subject to the original grant vest annually over a four-year period, commencing on the first anniversary date of the grant date. /s/ Phillip S. Askim, attorney-in-fact for Michelle A. Hodges 2022-05-26