X0609 4 2026-06-05 0001486957 BWX Technologies, Inc. BWXT 0001307313 Burbach Gerhard F false 800 MAIN STREET 4TH FLOOR LYNCHBURG VA 24504 1 0 0 0 0 Dividend Equivalent Rights 2026-06-05 4 A 0 19.62 0 A Common Stock 19.62 777.92 D The dividend equivalent rights accrued on seven restricted stock unit grants of which the reporting person has elected to defer receipt of the shares underlying the RSUs. Each RSU and DER represent a contingent right to receive one share of BWXT common stock. In accordance with the deferral election, the DERs will be delivered to the reporting person proportionately with the RSUs to which they relate. /s/ Gerhard F. Burbach, by Alexander D. Cobey, attorney-in-fact 2026-06-09