Sec Form 4 Filing - BARRY RICHARD M @ People's United Financial, Inc. - 2022-04-01

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 BARRY RICHARD M 2. Issuer Name and Ticker or Trading Symbol People's United Financial, Inc. [ PBCT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP, Chief Credit Officer (Last) (First) (Middle) C/O PEOPLE'S UNITED BANK, N.A., 850 MAIN STREET 3. Date of Earliest Transaction (MM/DD/YY) 04/01/2022 (Street) BRIDGEPORT, CT06604 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 04/01/2022 D( 1 )( 2 ) 104,568( 2 ) D 0 D Common Stock 04/01/2022 A( 1 )( 3 ) 26,299( 3 ) A $ 0 26,299 D Common Stock 04/01/2022 D( 1 )( 3 ) 26,299( 3 ) D 0 D

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 Option to Buy $ 15.285 04/01/2022 D( 4 ) 52,006 ( 5 ) 02/18/2031 Common Stock 52,006 ( 4 ) 0 D Employee Option to Buy $ 20.9325 04/01/2022 D( 4 ) 28,689 ( 6 ) 02/17/2032 Common Stock 28,689 ( 4 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other BARRY RICHARD M C/O PEOPLE'S UNITED BANK, N.A. 850 MAIN STREET BRIDGEPORT, CT06604 EVP, Chief Credit Officer Signatures /s/ Richard M. Barry 04/01/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On April 1, 2022, pursuant to an Agreement and Plan of Merger (the "Merger Agreement"), Bridge Merger Corp. ("Merger Sub"), a direct, wholly owned subsidiary of M&T Bank Corporation ("M&T"), merged with and into People's United Financial, Inc., a Delaware corporation ("People's United") with People's United as the surviving entity (the "Merger") and People's United then merged with and into M&T, with M&T as the surviving entity. Pursuant to the Merger Agreement, each issued and outstanding share of People's United common stock was converted into the right to receive 0.118 of a share of M&T (the "exchange ratio"). ( 2 )Includes 86,802 shares of People's United restricted stock subject to time-based vesting conditions. Pursuant to the Merger Agreement, at the effective time of the Merger, such People's United restricted shares were converted into restricted shares of M&T common stock equal to the number of People's United restricted shares multiplied by the exchange ratio (rounded up or down to the nearest whole share). Except as provided in the Merger Agreement, all shares of M&T common stock received in respect of such shares of People's United restricted stock will remain subject to the same time-based vesting conditions applicable to the original award. ( 3 )The reporting person was previously granted People's United performance share units which provided for delivery of shares of People's United's common stock upon the achievement of specified performance criteria. Pursuant to the Merger Agreement, at the effective time of the Merger, the People's United outstanding performance share units were deemed earned based on the greater of target and actual level of performance through the effective time of the Merger (as reasonably determined by the compensation committee of the People's United board of directors), and each such performance share unit was cancelled and the reporting person became entitled to receive time-vesting restricted share units denominated in shares of M&T common stock, as set forth in the Merger Agreement, in an amount calculated by multiplying the number of earned performance share units (including any applicable dividend equivalents) by the exchange ratio (rounded up or down to the nearest whole number). ( 4 )At the effective time of the Merger, each outstanding option to purchase shares of People's United common stock (a "People's United Option") ceased to represent an option to purchase shares of People's United common stock and was converted into an option to purchase a number of shares of M&T common stock (an "M&T Option") equal to the product (rounded down to the nearest whole number) of (1) the number of shares of People's United common stock subject to such People's United Option immediately prior to the effective time of the Merger and (2) the exchange ratio, at an exercise price per share (rounded up to the nearest whole cent) equal to (a) the exercise price per share of People's United common stock of such People's United Option immediately prior to the effective time of the Merger divided by (b) the exchange ratio. ( 5 )These options vest in annual increments on 3/1/22 (33 1/3%); 3/1/23 (33 1/3%); and 3/1/24 (33 1/3%). ( 6 )These options vest in annual increments on 3/1/23 (33 1/3%); 3/1/24 (33 1/3%); and 3/1/25 (33 1/3%).

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