X0306 4/A 2020-09-14 2020-09-16 0 0000353569 QUIDEL CORP /DE/ QDEL 0001333458 Bujarski Robert Joseph 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 Chief Operating Officer Restricted Stock Units 2020-09-14 4 A 0 1254 0.00 A Common Stock 1254 1254 D Non-Qualified Stock Options 159.39 2020-09-14 4 A 0 2935 0.00 A 2030-09-14 Common Stock 2935 2935 D Each restricted stock unit represents the right to receive one (1) share of Quidel Corporation common stock. 313 shares will vest on the first anniversary date of the grant date, September 14, 2021. 313 shares will vest on the second anniversary date of the grant date, September 14, 2022. 314 shares will vest on the third anniversary date of the grant date, September 14, 2023. 314 shares will vest on the fourth anniversary date of the grant date, September 14, 2024. 1,467 shares will vest on the second anniversary date of the grant date, September 14, 2022. 734 shares will vest on the third anniversary date of the grant date, September 14, 2023. 734 shares will vest on the fourth anniversary date of the grant date, September 14, 2024. This amendment is being filed to correct the exercise price of the non-qualified stock options granted on September 14, 2020. Robert J. Bujarski 2020-09-16