X0609 4 2026-08-12 0001486957 BWX Technologies, Inc. BWXT 0001408482 Geveden Rex D false 1720 MT. ATHOS ROAD LYNCHBURG VA 24504 1 1 0 0 President and CEO 1 Common Stock 2026-08-12 4 S 0 2407 171.2147 D 200084 D Common Stock 2026-08-12 4 S 0 4730 172.1796 D 195354 D Common Stock 2026-08-12 4 S 0 263 172.9971 D 195091 D Common Stock 2026-08-12 4 S 0 2600 174.2250 D 192491 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 $170.6500 to $171.6300 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 $171.6700 to $172.6000 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 $172.8200 to $173.6900 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 $173.8500 to $174.2400 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 Alexander D. Cobey, attorney-in-fact 2026-08-13