Sec Form 4/A Filing - Singh Rajinder P @ BankUnited, Inc. - 2025-03-12

FORM 4/A 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 Singh Rajinder P 2. Issuer Name and Ticker or Trading Symbol BankUnited, Inc. [ BKU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) X __ Other (specify below) President and CEO/Chairman of the Board (Last) (First) (Middle) C/O BANKUNITED, INC, 14817 OAK LANE 3. Date of Earliest Transaction (MM/DD/YY) 03/12/2025 (Street) MIAMI LAKES, FL33016 4. If Amendment, Date Original Filed (MM/DD/YY) 03/14/2025 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

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 Restricted Stock Unit ( 1 ) 03/12/2025 M 58,099 ( 2 ) ( 3 ) ( 3 ) Common Stock, par value $0.01 per share 58,099 ( 2 ) $ 0 67,890 ( 2 ) D

Reporting Owners Repo rting Owner Name / Address Relationships Director 10% Owner Officer Other Singh Rajinder P C/O BANKUNITED, INC 14817 OAK LANE MIAMI LAKES, FL33016 X President and CEO Chairman of the Board Signatures /s/ Jacqueline Bravo, as Attorney-in-Fact 03/18/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each restricted share unit represents the right to receive, at settlement, one share of common stock or cash in an amount equal to the fair market value of one share of common stock. ( 2 )This amended Form 4 is being filed to correct an entry error in Table II on the reporting person's Form 4 filed on March 14, 2025. As reported in this amendment, the correct number of units vested was 58,099 instead of 58,009 units that was originally reported. The total number of units beneficially owned following the reported transaction is 67,890, instead of 67,980 units that was originally reported. ( 3 )40,130 units that vested on December 31, 2024 and 31,952 units that will vest on December 31, 2025 were granted under the BankUnited, Inc. 2014 Omnibus Equity Incentive Plan. The units granted under the BankUnited, Inc. 2023 Omnibus Equity Incentive Plan include 17,969 units that vested on December 31, 2024; 17,969 units that will vest on December 31, 2025; and 17,969 that will vest December 31, 2026.

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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