X0306 4 2021-12-22 0 0001853513 Mister Car Wash, Inc. MCW 0001865166 Lindsay Casey Penn C/O MISTER CAR WASH, INC. 222 E 5TH STREET TUCSON AZ 85705 0 1 0 0 See Remarks Common Stock 2021-12-22 4 M 0 20000 0.66 A 72800 D Common Stock 2021-12-22 4 S 0 47881 17.20 D 24919 D Common Stock 2021-12-22 4 S 0 24919 17.51 D 0 D Common Stock 2021-12-23 4 M 0 10000 0.66 A 10000 D Common Stock 2021-12-23 4 S 0 10000 18.51 D 0 D Stock Option (Right to Buy) 0.66 2021-12-22 4 M 0 20000 0.00 D 2024-09-02 Common Stock 20000 362312 D Stock Option (Right to Buy) 0.66 2021-12-23 4 M 0 10000 0.00 D 2024-09-02 Common Stock 10000 352312 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.50 to $17.49. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $17.50 to $17.63. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information egarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.50 to $18.56. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The option is fully vested and exercisable. /s/ Lisa Funk, as Attorney-in-Fact for Casey Lindsay 2021-12-27