X0306 4 2019-02-04 0 0000353569 QUIDEL CORP /DE/ QDEL 0001609320 Kroll Werner 12544 HIGH BLUFF DRIVE, SUITE 200 SAN DIEGO CA 92130 0 1 0 0 SVP, R&D Common Stock 2019-02-05 4 A 0 1201 0.00 A 17206 D Common Stock 2019-02-05 4 F 0 490 59.00 D 16785 D Non-Qualified Stock Option 59.12 2019-02-04 4 A 0 7850 0.00 A 2029-02-04 Common Stock 7850 7850 D Restricted Stock Units 2019-02-04 4 A 0 3925 0.00 A Common Stock 3925 3925 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. The amount of securities beneficially owned following this transaction include an additional 69 shares due to the Reporting Person's purchase of shares pursuant to the Issuer's Employee Stock Purchase Plan. 3,925 shares will vest on the second anniversary date of the grant date, February 4, 2021. 1,963 shares will vest on the third anniversary date of the grant date, February 4, 2022. 1,962 shares will vest on the fourth anniversary date of the grant date, February 4, 2023. Each restricted stock unit represents the right to receive one share of Quidel Corporation common stock. 3,925 shares will vest on the fourth anniversary date of the grant date, February 4, 2023. Robert J. Bujarski, attorney-in-fact for Werner Kroll 2019-02-06