X0306 4 2018-02-24 0 0000353569 QUIDEL CORP /DE/ QDEL 0001720077 BORKAR RATAN S 12544 HIGH BLUFF DRIVE SUITE 200 SAN DIEGO CA 92130 0 1 0 0 SVP, Intl Comm Operations Common Stock 2018-02-24 4 A 0 240 0.00 A 11919 D Common Stock 2018-02-24 4 F 0 118 43.95 D 11801 D Reflects vesting of prior restricted stock units, which 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. Robert J. Bujarski, attorney-in-fact for Ratan S. Borkar 2018-02-27