BWXT · BWX Technologies, Inc.

RSUs vest in three equal annual installments beginning July 1, 2026.

RSUs vest in three equal annual installments beginning July 1, 2026.

The dividend equivalent rights accrued on two 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.

The dividend equivalent rights accrued on eight 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.

The dividend equivalent rights accrued on nine 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.

The dividend equivalent rights accrued on five 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.

The dividend equivalent rights accrued on five 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.

The dividend equivalent rights accrued on nine 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.

The dividend equivalent rights accrued on four 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.

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.

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 $204.3050 to $205.1600 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 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 $205.3500 to $206.2500 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 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 $203.2900 to $204.2700 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 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.

Stock options vest in three equal annual installments beginning February 29, 2025.

Stock Options vest in three equal annual installments beginning February 26, 2026.

Stock Options vest in three equal annual installments beginning February 27, 2024.

Stock Options vest in three equal annual installments beginning February 27, 2024.

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 his deferral election, vested shares will be delivered to the reporting person in one lump sum following termination of service on the Board of Directors.

Grant of restricted stock units pursuant to the BWX Technologies, Inc. 2020 Omnibus Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of BWXT common stock.

RSUs vested immediately.

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 his deferral election, vested shares will be delivered to the reporting person in five annual installments following termination of service on the Board of Directors.

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 his deferral election, vested shares will be delivered to the reporting person in one lump sum, two years following termination of service on the Board of Directors.

RSUs vested immediately.

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 his deferral election, vested shares will be delivered to the reporting person in five annual installments following termination of service on the Board of Directors.

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.

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 his deferral election, vested shares will be delivered to the reporting person in one lump sum following termination of service on the Board of Directors.

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 one lump sum, two years following termination of service on the Board of Directors.

RSUs vested immediately.

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 dividend equivalent rights accrued on four 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.

The dividend equivalent rights accrued on one restricted stock unit grant 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.

The dividend equivalent rights accrued on nine 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.

The dividend equivalent rights accrued on four 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.

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.

The dividend equivalent rights accrued on eight 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.

The dividend equivalent rights accrued on three 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.

The dividend equivalent rights accrued on six 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.

The price in Column 4 is a weighted average price. These shares were sold at prices ranging from $214.36 to $214.82, 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.

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 his deferral election, vested shares will be delivered to the reporting person in one lump sum upon termination of service on the Board of Directors.