Sec Form 4/A Filing - Lindsay Casey Penn @ Mister Car Wash, Inc. - 2021-08-24

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 Lindsay Casey Penn 2. Issuer Name and Ticker or Trading Symbol Mister Car Wash, Inc. [ MCW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) C/O MISTER CAR WASH, INC., 222 E 5TH STREET 3. Date of Earliest Transaction (MM/DD/YY) 08/24/2021 (Street) TUCSON, AZ85705 4. If Amendment, Date Original Filed (MM/DD/YY) 08/26/2021 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) $ 0.67 08/24/2021 M( 1 ) 63,512 ( 2 ) 05/31/2027 Common Stock 63,512 $ 0 10,792 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Lindsay Casey Penn C/O MISTER CAR WASH, INC. 222 E 5TH STREET TUCSON, AZ85705 See Remarks Signatures /s/ Lisa Funk, as Attorney-in-Fact for Casey Lindsay 06/23/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On August 26, 2021, the Reporting Person filed a Form 4 which inadvertently misidentified the tranche of options that was exercised on August 24, 2021. The tranche of options that was actually exercised on August 24, 2021 has an exercise price of $0.67 per share and an expiration date of May 31, 2027, as reported in this amendment. Due to the foregoing error in the Form 4 filed on August 26, 2021, the Form 4s filed by the Reporting Person on December 27, 2021, January 3, 2022, January 27, 2022 and February 3, 2022, respectively, to report subsequent exercises of the tranche of options with an exercise price of $0.66 per share and an expiration date of September 2, 2024 reported incorrect remaining balances in Table II, Column 9. Those incorrect balances were ultimately corrected in the Form 4 filed by the Reporting Person on March 22, 2022. ( 2 )The option is fully vested and exercisable.

Remarks: Vice President, Corporate Development

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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