X0306 4 2019-05-27 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 2019-05-27 4 A 0 4377 0.00 A 21939 D Common Stock 2019-05-27 4 F 0 2170 54.42 D 19769 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 Werner Kroll 2019-05-29