Sec Form 4/A Filing - SEIFFER JONATHAN A @ Mister Car Wash, Inc. - 2026-05-19

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 SEIFFER JONATHAN A 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 X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 11111 SANTA MONICA BLVD., SUITE 2000 3. Date of Earliest Transaction (MM/DD/YY) 05/19/2026 (Street) LOS ANGELES, CA90025 4. If Amendment, Date Original Filed (MM/DD/YY) 05/19/2026 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 05/19/2026 J( 1 )( 2 ) 219,213,079 ( 3 ) D $ 7 0 ( 4 ) I See footnote. ( 5 ) ( 6 )

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 Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SEIFFER JONATHAN A 11111 SANTA MONICA BLVD. SUITE 2000 LOS ANGELES, CA90025 X X Signatures /s/ Andrew C. Goldberg, attorney-in-fact 05/19/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In connection with the terms of an Agreement and Plan of Merger, dated February 17, 2026 (the "Merger Agreement"), by and among the Issuer, MCW Parent, LP ("Parent"), Boson Merger Sub, Inc., a wholly owned subsidiary of Parent ("Merger Sub"), and, solely for purposes of certain provisions in the Merger Agreement, Mister Car Wash Holdings, Inc., a wholly owned subsidiary of the Issuer, Merger Sub merged with and into the Issuer, with the Issuer continuing as the surviving corporation (the "Merger"). ( 2 )Immediately prior to the effective time of the Merger, pursuant to the Contribution Agreement, dated February 17, 2026, by and among Parent, Green Equity Investors VI, L.P. ("GEI VI"), Green Equity Investors Side VI, L.P. ("GEI Side VI"), LGP Associates VI-A LLC ("Associates VI-A") and LGP Associates VI-B LLC ("Associates VI-B"), the shares of the Issuer's Common Stock ("Common Stock"), par value $0.01 (the "Shares"), owned by the Reporting Persons were contributed and assigned to Parent in exchange for equity interests in Parent (together with the Merger, the "Transaction"). In accordance with the terms of the Merger Agreement, at the effective time of the Merger, the Shares were automatically cancelled and extinguished without any conversion thereof or consideration paid therefor. ( 3 )Represents shares of Common Stock previously owned by GEI VI, GEI Side VI, Associates VI-A and Associates VI-B that were cancelled as part of the Transaction. Of the shares of Common Stock reported, 134,812,845 were held by GEI VI, 80,348,253 were held by GEI Side VI, 315,683 were held by Associates VI-A, and 3,736,298 were held by Associates VI-B. ( 4 )Represents shares owned by GEI VI, GEI Side VI, Associates VI-A and Associates VI-B. ( 5 )Mr. Seiffer, directly (whether through ownership or position), or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), to be the indirect beneficial owner of some or all of the shares of Common Stock held by GEI VI, GEI Side VI, Associates VI-A, or Associates VI-B and, therefore, a "ten percent holder" hereunder. ( 6 )Mr. Seiffer disclaims beneficial ownership of the shares of Common Stock reported herein, except to the extent of his pecuniary interest therein. This report shall not otherwise be deemed an admission that he is the beneficial owner of such securities for purposes of Section 16 of the Exchange Act or for any other purpose.

Remarks: This amendment is being filed to check the box indicating that the Reporting Person is no longer subject to Section 16.

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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