Sec Form 4/A Filing - Lai John Lo-minn @ Mister Car Wash, Inc. - 2024-03-15

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 Lai John Lo-minn 2. Issuer Name and Ticker or Trading Symbol Mister Car Wash, Inc. [ MCW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Executive Officer (Last) (First) (Middle) C/O MISTER CAR WASH, INC., 222 E. 5TH STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/15/2024 (Street) TUCSON, AZ85705 4. If Amendment, Date Original Filed (MM/DD/YY) 05/13/2024 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 Stock Option (Right to Buy) $ 0.46 03/15/2024 M 2,180,066 ( 1 ) 09/02/2024 Common Stock 2,180,066 $ 0 2,180,067 D Stock Option (Right to Buy) $ 0.66 03/15/2024 M 855,000 ( 1 ) 09/02/2024 Common Stock 855,000 $ 0 855,000 I by The JLKL 2020 Irrevocable Family Trust

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Lai John Lo-minn C/O MISTER CAR WASH, INC. 222 E. 5TH STREET TUCSON, AZ85705 X Chief Executive Officer Signatures /s/ Markus Hartmann, as Attorney-in-Fact for John Lai 05/13/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The option is fully vested and exercisable.

Remarks: This amendment is being filed to reflect in Column 5 of Table II the diposition of 2,180,066 Stock Options and 855,000 Stock Options on 3/15/2024 which were previously inadvertently reported incorectly in this column as an "A" for acquisitions. The information relating to these transactions were reported accurately in all other aspects including the correct use of code M identifying the transaction as an exercise of a derivative security exempted pursuant to Rule 16b-3, and the number of derivative securities reported in column 9 reflects the reduction of 2,180,066 and 855,000 options from the previously reported balances in column 9 of 4,360,133 and 1,710,000 respectively filed on Form 4 on 09/18/2023.

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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