X0306 4 2018-01-16 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 Non-Qualified Stock Option 46.41 2018-01-16 4 A 0 9212 0.00 A 2028-01-16 Common Stock 9212 9212 D Restricted Stock Units 2018-01-16 4 A 0 4606 0.00 A Common Stock 4606 4606 D 4,606 shares will vest on the second anniversary date of the grant date, January 16, 2020. 2,303 shares will vest on the third anniversary date of the grant date, January 16, 2021. 2,303 shares will vest on the fourth anniversary date of the grant date, January 16, 2022. Each restricted stock unit represents the right to receive one share of Quidel Corporation common stock. 4,606 shares will vest on the fourth anniversary date of the grant date, January 16, 2022. This Form 4 relates to annual management awards and is being filed non-timely due to an administrative error. Robert J. Bujarski 2018-01-23