X0306 4 2019-05-14 0 0000353569 QUIDEL CORP /DE/ QDEL 0001065168 WIDDER KENNETH J 12544 HIGH BLUFF DRIVE SUITE 200 SAN DIEGO CA 92130 1 0 0 0 Common Stock 2019-05-15 4 M 0 1661 0.00 A 12316 D Restricted Stock Units (Converted) 2019-05-14 4 A 0 1050 0.00 A Common Stock 1050 1050 D Restricted Stock Units (Premium) 2019-05-14 4 A 0 315 0.00 A Common Stock 315 315 D Restricted Stock Units (Equity Grant) 2019-05-14 4 A 0 2100 0.00 A Common Stock 2100 2100 D Reflects release of restricted stock units that were previously reported on Form 4. Each restricted stock unit represents the right to receive one share of Quidel Corporation common stock. The restricted stock units were received in lieu of cash payments to the reporting person for certain retainer and Board of Director service-related fees under a deferred compensation program applicable to participating non-employee directors. Vested restricted stock units may be deferred, in which case, payment will occur according to the elected deferral schedule. The restricted stock units vest on the date of the grant, May 14, 2019. The restricted stock units vest on May 14, 2020. Robert J. Bujarski, attorney-in-fact for Kenneth J. Widder 2019-05-16