X0306 4 2017-02-15 0 0000353569 QUIDEL CORP /DE/ QDEL 0001333458 Bujarski Robert Joseph 12544 HIGH BLUFF DRIVE, SUITE 200 SAN DIEGO CA 92130 0 1 0 0 SVP, Bus Dev & Gen Counsel Common Stock 2018-02-15 4 A 0 7171 0.00 A 47203 D Common Stock 2018-02-15 4 F 0 2479 45.10 D 44724 D Reporting Person acquired these shares in connection with full achievement of performance metrics associated with performance-based restricted stock units awarded on 2/15/2017. 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 performance-based restricted stock units. Robert J. Bujarski 2018-02-20