X0306 4 2020-05-22 0 0000353569 QUIDEL CORP /DE/ QDEL 0001609320 Kroll Werner 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 SVP, R&D Common Stock 2020-05-22 4 M 0 17596 23.41 A 22195 D Common Stock 2020-05-22 4 M 0 35192 15.40 A 57387 D Common Stock 2020-05-22 4 M 0 10758 21.08 A 68145 D Common Stock 2020-05-22 4 M 0 4606 46.41 A 72751 D Common Stock 2020-05-22 4 S 0 68152 174.4358 D 4599 D Common Stock 2020-05-27 4 M 0 4376 0.00 A 8975 D Common Stock 2020-05-27 4 F 0 2304 0.00 D 6671 D Non-Qualified Stock Options 23.41 2020-05-22 4 M 0 17596 0.00 D 2025-02-05 Common Stock 17596 0 D Non-Qualified Stock Options 15.40 2020-05-22 4 M 0 35192 0.00 D 2026-02-10 Common Stock 35192 0 D Non-Qualified Stock Options 21.08 2020-05-22 4 M 0 10758 0.00 D 2027-02-15 Common Stock 10758 3585 D Non-Qualified Stock Options 46.41 2020-05-22 4 M 0 4606 0.00 D 2028-01-16 Common Stock 4606 4606 D Restricted Stock Units 2020-05-27 4 M 0 4376 0.00 D Common Stock 4376 8752 D The amount of securities beneficially owned following this transaction include an additional 272 shares due to the Reporting Person's purchase of shares pursuant to the Issuer's Employee Stock Purchase Plan. The weighted average sale price for these transactions was $174.4358 per share, with a range of $171.69 to $180.50. Upon request, the Reporting Person hereby undertakes to provide to staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder, the full information regarding the number of shares sold at each separate price. Reflects release of restricted stock units that were previously reported on Form 4. The 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 vesting of restricted stock units. 17,596 shares vested on 02/05/2017; 8,798 shares vested on 02/05/2018; and 8,798 shares vested on 02/05/2019. 17,596 shares vested on 02/10/2018; 8,798 shares vested on 02/10/2019; and 8,798 shares vested on 02/10/2020. 7,172 shares vested on 02/15/2019; 3,586 shares vested on 02/15/2020; and 3,585 shares will vest on 02/15/2021. 4,606 shares vested on 01/16/2020; 2,303 shares will vest on 01/16/2021; and 2,303 shares will vest on 01/16/2022. Restricted stock units convert into common stock on a one-for-one basis. On 05/27/2014, the Reporting Person was granted 17,505 restricted stock units vesting as follows: 4,377 shares vested on 05/27/2019; 4,376 shares vested on 05/27/2020; 4,376 shares will vest on 05/27/2021; and 4,376 shares will vest on 05/27/2022. All transactions occurring on May 22, 2020 were effected pursuant to a pre-established 10b5-1 trading plan Robert J. Bujarski, attorney-in-fact for Werner Kroll 2020-05-27