X0306 4 2020-09-19 0 0000353569 QUIDEL CORP /DE/ QDEL 0001720077 BORKAR RATAN S 9975 SUMMERS RIDGE ROAD SAN DIEGO CA 92121 0 1 0 0 SVP, Intl Comm Operations Common Stock 2020-09-19 4 A 0 2500 0.00 A 3024 D Common Stock 2020-09-19 4 F 0 2500 189.31 D 524 D Restricted Stock Units 2020-09-19 4 M 0 2500 0.00 D Common Stock 2500 0 D Reflects release of restricted stock units that 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. Restricted stock units convert into common stock on a one-for-one basis. On September 19, 2016, the reporting person was granted 2,500 restricted stock units vesting on the fourth anniversary of the grant date. Robert J. Bujarski, attorney-in-fact for Ratan S. Borkar 2020-09-22