X0306 4 2014-01-18 0 0000353569 QUIDEL CORP /DE/ QDEL 0001472036 Stenzel Timothy Todd 10165 MCKELLAR COURT SAN DIEGO CA 92121 0 1 0 0 Chief Science Officer Common Stock 2014-01-18 4 F 0 1022 31.44 D 11773 D The 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 vesting of a restricted stock award. Robert J. Bujarski, attorney-in-fact for Timothy T. Stenzel 2014-01-21