X0508 4 2025-11-12 0001486957 BWX Technologies, Inc. BWXT 0001408482 Geveden Rex D 800 MAIN STREET 4TH FLOOR LYNCHBURG VA 24504 1 1 0 0 President and CEO 1 Common Stock 2025-11-12 4 S 0 709 195.0825 D 196885 D Common Stock 2025-11-12 4 S 0 1962 196.7407 D 194923 D Common Stock 2025-11-12 4 S 0 2863 197.6916 D 192060 D Common Stock 2025-11-12 4 S 0 2414 198.6728 D 189646 D Common Stock 2025-11-12 4 S 0 2052 199.3662 D 187594 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 8/11/2025. The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $194.7200 to $195.6100 inclusive. Upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $196.0200 to $197.0100 inclusive. Upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $197.1350 to $198.1300 inclusive. Upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $198.1700 to $199.1250 inclusive. Upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $199.1900 to $199.8500 inclusive. Upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. /s/ Rex D. Geveden, by Theresa B. Taylor, attorney-in-fact 2025-11-13