X0609 4 2026-04-30 0 0001486957 BWX Technologies, Inc. BWXT 0001183850 PIASECKI NICOLE WEYERHAEUSER false 800 MAIN STREET LYNCHBURG VA 24504 1 0 0 0 0 Restricted Stock Units 0 2026-04-30 4 A 0 762 0 A Common Stock 762 762 D Grant of restricted stock units pursuant to the 2020 Omnibus Incentive Plan of BWX Technologies, Inc. Each restricted stock unit represents a contingent right to receive one share of BWXT common stock. RSUs vested immediately. The reporting person elected to defer receipt of shares underlying the RSUs. In accordance with her deferral election, vested shares will be delivered to the reporting person in five annual installments commencing one year after termination of service on the Board of Directors. /s/ Nicole W. Piasecki, by Theresa B. Taylor, attorney-in-fact 2026-05-04