Sec Form 4 Filing - WALCHIRK MARK S @ PATTERSON COMPANIES, INC. - 2022-07-01

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person WALCHIRK MARK S 2. Issuer Name and Ticker or Trading Symbol PATTERSON COMPANIES, INC. [ PDCO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President & CEO (Last) (First) (Middle) 1031 MENDOTA HEIGHTS ROAD 3. Date of Earliest Transaction (MM/DD/YY) 07/01/2022 (Street) ST. PAUL, MN55120 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 07/01/2022 F( 1 ) 48,492 D $ 30.59 279,804( 2 ) D Common Stock 07/01/2022 F( 3 ) 18,938 D $ 30.59 260,866( 4 ) D Common Stock 07/01/2022 A( 5 ) 35,551 A $ 30.59 296,417( 4 ) D Common Stock 1,246( 6 ) I By ESOP

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Employee Stock Options $ 30.59 07/01/2022 A( 7 ) 122,466 ( 8 ) 07/01/2032 Common Stock 122,466 $ 30.59 122,466 D Employee Stock Options( 9 ) $ 30.77 ( 10 ) 07/01/2031 Common Stock 126,103 126,103 D Employee Stock Options( 11 ) $ 23.57 ( 12 ) 07/14/2030 Common Stock 178,965 178,965 D Employee Stock Options( 13 ) $ 22.25 ( 14 ) 07/01/2029 Common Stock 243,994 243,994 D Employee Stock Options( 15 ) $ 22.48 07/01/2021 07/01/2028 Common Stock 99,956 99,956 D Employee Stock Options( 16 ) $ 35.41 12/01/2020 12/01/2027 Common Stock 52,764 52,764 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other WALCHIRK MARK S 1031 MENDOTA HEIGHTS ROAD ST. PAUL, MN55120 X President & CEO Signatures Les B. Korsh, by Power of Attorney 07/06/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On July 1, 2022, the restricted stock unit ("RSU") equivalents vested per the Patterson Companies, Inc. Amended and Restated 2015 Omnibus Incentive Plan ("Plan) and were paid out in common stock. The Company withheld shares to satisfy the tax liability associated with the vesting. ( 2 )Includes an aggregate of 119,566 RSUs awarded on 12/1/2017, 7/1/2018, 7/1/2019, 7/14/2020 and 7/1/2021 to Reporting Person pursuant to the Plan. The RSUs vest contingent upon continued employment as follows: 54,476 units vest 7/1/2022, 1,824 units vest 12/1/2022, 17,959 units vest 7/1/2023, 34,472 units vest 7/14/2023 and 10,835 units vest 7/1/2024. ( 3 )Represents shares of common stock withheld to satisfy a portion of tax liability upon the lapse of restrictions on RSUs issued pursuant to the Plan. ( 4 )Includes an aggregate of 65,091 RSUs awarded on 12/1/2017, 7/1/2018, 7/1/2019, 7/14/2020 and 7/1/2021 to Reporting Person pursuant to the Plan. The RSUs vest contingent upon employment as follows: 1,824 units vest 12/1/2022, 17,958 units vest 7/1/2023, 34,472 units vest 7/14/2023 and 10,837 units vest 7 /1/2024. ( 5 )Represents RSUs awarded on 7/1/2022 to Reporting Person pursuant to the Plan. The RSUs awarded vest, assuming continued employment, 33.3% on 7/1/2023, 33.3% on 7/1/2024 and 33.4% on 7/1/2025. ( 6 )Represents shares of common stock indirectly help by the Reporting Person's Employee Stock Ownership Plan ("ESOP") account through April 29, 2022. ( 7 )Stock options granted pursuant to the Plan on 7/1/2022. ( 8 )Options are exercisable as follows: 33.3% on 7/1/2023, 33.3% on 7/1/2024 and 33.4% on 7/1/2025. ( 9 )Stock options granted pursuant to the Plan on 7/1/2021. ( 10 )Options are exercisable as follows: 33.3% on 7/1/2022, 33.3% on 7/1/2023 and 33.4% on 7/1/2024. ( 11 )Stock options granted pursuant to the Plan on 7/14/2020. ( 12 )Options are exercisable as follows: 33.3% on 7/14/2021, 33.3% on 7/14/2022 and 33.4% on 7/14/2023. ( 13 )Stock options granted pursuant to the Plan on 7/1/2019. ( 14 )Options are exercisable as follows: 33.3% on 7/1/2020, 33.3% on 7/1/2021 and 33.4% on 7/1/2022. ( 15 )Stock options granted pursuant to the Plan on 7/1/2018. ( 16 )Stock options granted pursuant to the Plan on 12/1/2017.

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