X0306 4 2017-02-05 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 2017-02-05 4 A 0 2403 0.00 A 3748 D Common Stock 2017-02-05 4 F 0 1052 19.15 D 2696 D Reflects release of restricted stock units that were previously reported on Form 4. The amount of securities beneficially owned following this transaction include an additional 1,345 shares due to the Reporting Person's purchase of shares pursuant to the Issuer's Employee Stock Purchase Plan. 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. Robert J. Bujarski, attorney-in-fact for Werner Kroll 2017-02-08