X0306 4 2020-02-10 0 0000353569 QUIDEL CORP /DE/ QDEL 0001609320 Kroll Werner 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 SVP, R&D Common Stock 2020-02-10 4 A 0 1201 0.00 A 4996 D Common Stock 2020-02-10 4 F 0 669 77.52 D 4327 D Restricted Stock Units (Converted) 2020-02-10 4 A 0 1050 0.00 A Common Stock 1050 1050 D Restricted Stock Units (Premium) 2020-02-10 4 A 0 210 0.00 A Common Stock 210 210 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 share of Quidel Corporation common stock. The restricted stock units vest on the date of grant, February 10, 2020. The restricted stock units were received in lieu of a percentage of the reporting person's 2019 cash bonus pursuant to the Quidel Corporation Deferred Bonus Compensation Plan. The restricted stock units vest on the first anniversary date of the grant date, February 10, 2021. Robert J. Bujarski, attorney-in-fact for Werner Kroll 2020-02-12