X0306 4 2020-12-31 0 0000891024 PATTERSON COMPANIES, INC. PDCO 0001766974 SHIRLEY ERIC R 1031 MENDOTA HEIGHTS ROAD ST. PAUL MN 55120 0 1 0 0 President-Patterson Dental Common Stock 2020-12-31 4 A 0 198 17.3655 A 51643 D Common Stock 248 I By ESOP Employee Stock Options 23.57 2030-07-14 Common Stock 24780 24780 D Employee Stock Options 22.25 2029-07-01 Common Stock 33784 33784 D Shares acquired by Reporting Person pursuant to the Patterson Companies, Inc. Employee Stock Purchase Plan. Includes 26,607 Restricted Stock Units ("RSUs") granted to Reporting Person pursuant to the Patterson Companies, Inc. Amended and Restated 2015 Omnibus Incentive Plan ("Plan") on 2/4/2019 as an inducement award granted pursuant to the Plan. The RSUs will vest, assuming continued employment, 100% on 2/4/2022. Includes 14,410 RSU equivalents attributable to the July 1, 2020 determination by the Compensation Committee that the performance criteria for the period of April 27, 2019 through April 25, 2020 applicable to non-derivative performance units issued on July 1, 2019 had been satisfied. Subject to continued employment of the Reporting Person through July 1, 2022, the RSU equivalents will automatically convert into shares of common stock. Includes 9,829 RSUs awarded to Reporting Person on 7/1/2019 and 7/14/2020 pursuant to the Plan. The RSUs vest contingent upon continued employment as follows: 5,056 units vest on 7/1/2022 and 4,773 units vest on 7/14/2023. Represents shares of common stock indirectly held by the Report Person's Employee Stock Ownership Plan (ESOP) account through April 25, 2020. Stock options granted pursuant to the Plan on 7/14/2020. Options are exercisable as follows: 33.3% on 7/14/2021, 33.3% on 7/14/2022 and 33.4% on 7/14/2023. Stock options granted pursuant to the Plan on 7/1/2019. Options are exercisable as follows: 33.3% on 7/1/2020, 33.3% on 7/1/2021 and 33.4% on 7/1/2022. Les B. Korsh, by Power of Attorney 2021-01-05