Sec Form 4 Filing - Hanigan Kevin J @ PROSPERITY BANCSHARES INC - 2019-12-02

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 Hanigan Kevin J 2. Issuer Name and Ticker or Trading Symbol PROSPERITY BANCSHARES INC [ PB] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President & COO (Last) (First) (Middle) 80 SUGAR CREEK CENTER BLVD. 3. Date of Earliest Transaction (MM/DD/YY) 12/02/2019 (Street) SUGAR LAND, TX77478 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 12/02/2019 P 3,000 A $ 69.24 160,841 ( 1 ) D Common Stock 3,033 I Through LegacyTexas 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

Reporting Owners Report ing Owner Name / Address Relationships Director 10% Owner Officer Other Hanigan Kevin J 80 SUGAR CREEK CENTER BLVD. SUGAR LAND, TX77478 X President & COO Signatures /s/ Charlotte M. Rasche, Attorney in fact 12/04/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On November 1, 2019, pursuant to the Agreement and Plan of Reorganization, dated as of June 16, 2019, by and between Prosperity Bancshares, Inc. ("Prosperity") and LegacyTexas Financial Group, Inc. ("Legacy"), Legacy merged with and into Prosperity (the "Merger"). In connection therewith, each outstanding share of Legacy common stock (including restricted stock awards and options, all of which were deemed vested immediately prior to the Merger), subject to certain limited exceptions, was converted into the right to receive 0.5280 of a share of Prosperity common stock, with cash payable in lieu of any fractional share, and $6.28 in cash. This total includes 681 shares of Prosperity common stock that were received in the Merger but inadvertently omitted from the reporting person's Form 4 filed on November 5, 2019.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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