 Shares of Mister Car Wash Inc. MSW, slumped 5.7 in premarket trading Tuesday, extending earlier losses, after the car wash company announced the pricing of its secondary stock offering at 4.9 discount. Selling stockholders of the company raised a total of about 234.8 million as the 12 million share offering priced at 19.57 a share, which is below Mondays closing price of 20.57. 