BWXT

SEC source: 0001628280-25-056804 · wk-form4_1765576294.xml · derivative · entry 1

Melvin Leland D · CIK 0001780421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 204.39

Underlying: Common Stock · 11.42 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-056807 · wk-form4_1765576422.xml · derivative · entry 1

Richardson John M · CIK 0001786800 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 312.23

Underlying: Common Stock · 12.23 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-056806 · wk-form4_1765576361.xml · derivative · entry 1

PIASECKI NICOLE WEYERHAEUSER · CIK 0001183850 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41.78

Underlying: Common Stock · 5.25 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-056803 · wk-form4_1765576211.xml · derivative · entry 1

Krieg Kenneth J · CIK 0001477490 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,392.2

Underlying: Common Stock · 29.22 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-056801 · wk-form4_1765576144.xml · derivative · entry 1

JASKA JAMES M · CIK 0001187147 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,065.53

Underlying: Common Stock · 21.82 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-056800 · wk-form4_1765576081.xml · derivative · entry 1

Burbach Gerhard F · CIK 0001307313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 741.34

Underlying: Common Stock · 17.69 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-056799 · wk-form4_1765576003.xml · derivative · entry 1

Bertsch Jan · CIK 0001477291 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,175.51

Underlying: Common Stock · 32.84 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-055158 · wk-form4_1764802593.xml · derivative · entry 3

Smith Toby W. · CIK 0002096777 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,337

Underlying: Common Stock · 2,337 shares

Expires not disclosed

F3 · derivative.exercise_date: Stock Options vest in three equal annual installments beginning December 1, 2026. Stock Options expire December 1, 2035.

F3 · derivative.expiration_date: Stock Options vest in three equal annual installments beginning December 1, 2026. Stock Options expire December 1, 2035.

SEC source: 0001628280-25-055158 · wk-form4_1764802593.xml · derivative · entry 2

Smith Toby W. · CIK 0002096777 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,714

Underlying: Common Stock · 1,714 shares

Expires not disclosed

F2 · derivative.exercise_date: RSUs vest in two equal annual installments beginning December 1, 2026.

F2 · derivative.expiration_date: RSUs vest in two equal annual installments beginning December 1, 2026.

SEC source: 0001628280-25-055158 · wk-form4_1764802593.xml · derivative · entry 1

Smith Toby W. · CIK 0002096777 · SVP and General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 801

Underlying: Common Stock · 801 shares

Expires not disclosed

F1 · derivative.exercise_date: RSUs vest in three equal annual installments beginning December 1, 2026.

F1 · derivative.expiration_date: RSUs vest in three equal annual installments beginning December 1, 2026.

SEC source: 0001123292-25-000643 · form4.xml · nonDerivative · entry 5

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 187,594

F1 · kind: 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.

F6 · price: 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.

SEC source: 0001123292-25-000643 · form4.xml · nonDerivative · entry 4

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 189,646

F1 · kind: 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.

F5 · price: 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.

SEC source: 0001123292-25-000643 · form4.xml · nonDerivative · entry 3

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 192,060

F1 · kind: 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.

F4 · price: 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.

SEC source: 0001123292-25-000643 · form4.xml · nonDerivative · entry 2

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 194,923

F1 · kind: 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.

F3 · price: 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.

SEC source: 0001123292-25-000643 · form4.xml · nonDerivative · entry 1

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 196,885

F1 · kind: 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.

F2 · price: 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.

SEC source: 0001628280-25-046468 · wk-form4_1761598635.xml · derivative · entry 3

Fitzgerald Michael Thomas · CIK 0001953099 · VP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,795 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: RSUs vest in three equal annual installments beginning October 24, 2023.

F1 · derivative.expiration_date: RSUs vest in three equal annual installments beginning October 24, 2023.

SEC source: 0001628280-25-046468 · wk-form4_1761598635.xml · nonDerivative · entry 2

Fitzgerald Michael Thomas · CIK 0001953099 · VP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,618

SEC source: 0001628280-25-046468 · wk-form4_1761598635.xml · nonDerivative · entry 1

Fitzgerald Michael Thomas · CIK 0001953099 · VP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,337

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001780421-25-000005 · wk-form4_1757369538.xml · derivative · entry 1

Melvin Leland D · CIK 0001780421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 192.97

Underlying: Common Stock · 12.51 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001183850-25-000005 · wk-form4_1757371064.xml · derivative · entry 1

PIASECKI NICOLE WEYERHAEUSER · CIK 0001183850 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36.53

Underlying: Common Stock · 5.74 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001477291-25-000003 · wk-form4_1757370963.xml · derivative · entry 1

Bertsch Jan · CIK 0001477291 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,142.67

Underlying: Common Stock · 36 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001307313-25-000004 · wk-form4_1757370901.xml · derivative · entry 1

Burbach Gerhard F · CIK 0001307313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 723.65

Underlying: Common Stock · 19.4 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001786800-25-000003 · wk-form4_1757370804.xml · derivative · entry 1

Richardson John M · CIK 0001786800 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300

Underlying: Common Stock · 13.41 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001187147-25-000006 · wk-form4_1757369458.xml · derivative · entry 1

JASKA JAMES M · CIK 0001187147 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,043.71

Underlying: Common Stock · 23.91 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001477490-25-000005 · wk-form4_1757369301.xml · derivative · entry 1

Krieg Kenneth J · CIK 0001477490 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,362.98

Underlying: Common Stock · 32.04 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001062993-25-014169 · form4.xml · nonDerivative · entry 1

Melvin Leland D · CIK 0001780421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,579

SEC source: 0001062993-25-014168 · form4.xml · derivative · entry 3

Whitford Ronald Owen Jr · CIK 0001961247 · SVP, General Counsel and Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,184

Underlying: Common Stock · 2,092 shares

Expires 2033-02-27

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: Stock option vests in three equal annual installments beginning February 27, 2024.

SEC source: 0001062993-25-014168 · form4.xml · nonDerivative · entry 2

Whitford Ronald Owen Jr · CIK 0001961247 · SVP, General Counsel and Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,149

F1 · price: The price in Column 4 is a weighted average price. The shares sold at prices ranging from $177.2700 to $177.5950 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.

SEC source: 0001062993-25-014168 · form4.xml · nonDerivative · entry 1

Whitford Ronald Owen Jr · CIK 0001961247 · SVP, General Counsel and Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,241

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001062993-25-013971 · form4.xml · nonDerivative · entry 1

Meguid Omar Fathi · CIK 0001961051 · SVP and Chief Digital Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,361

SEC source: 0001062993-25-013970 · form4.xml · nonDerivative · entry 2

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 197,594

F2 · price: The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $179.5500 to $179.7500 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.

SEC source: 0001062993-25-013970 · form4.xml · nonDerivative · entry 1

Geveden Rex D · CIK 0001408482 · Director · President and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 198,126

F1 · price: The price in Column 4 is a weighted average price. The shares were sold at prices ranging from $178.5450 to $179.5400 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.

SEC source: 0001062993-25-012633 · form4.xml · derivative · entry 2

Miller Joseph Kirwan · CIK 0002076159 · Pres., Government Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 711

Underlying: Common Stock · 711 shares

Expires not disclosed

F2 · derivative.exercise_date: RSUs vest in three equal annual installments beginning July 1, 2026.

F2 · derivative.expiration_date: RSUs vest in three equal annual installments beginning July 1, 2026.

SEC source: 0001062993-25-012633 · form4.xml · derivative · entry 1

Miller Joseph Kirwan · CIK 0002076159 · Pres., Government Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,406

Underlying: Common Stock · 2,406 shares

Expires not disclosed

F1 · derivative.exercise_date: Stock Options vest in three equal annual installments beginning July 1, 2026. Stock Options expire July 1, 2035.

F1 · derivative.expiration_date: Stock Options vest in three equal annual installments beginning July 1, 2026. Stock Options expire July 1, 2035.

SEC source: 0001628280-25-030270 · wk-form4_1749503410.xml · derivative · entry 1

Melvin Leland D · CIK 0001780421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 180.46

Underlying: Common Stock · 15.86 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-030277 · wk-form4_1749504010.xml · derivative · entry 1

Bertsch Jan · CIK 0001477291 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,106.67

Underlying: Common Stock · 45.6 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-030274 · wk-form4_1749503851.xml · derivative · entry 1

Burbach Gerhard F · CIK 0001307313 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 704.25

Underlying: Common Stock · 24.57 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-030272 · wk-form4_1749503714.xml · derivative · entry 1

Richardson John M · CIK 0001786800 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 286.59

Underlying: Common Stock · 16.99 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-030271 · wk-form4_1749503596.xml · derivative · entry 1

PIASECKI NICOLE WEYERHAEUSER · CIK 0001183850 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30.79

Underlying: Common Stock · 7.29 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-030268 · wk-form4_1749503276.xml · derivative · entry 1

Krieg Kenneth J · CIK 0001477490 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,330.94

Underlying: Common Stock · 40.58 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001628280-25-030266 · wk-form4_1749503066.xml · derivative · entry 1

JASKA JAMES M · CIK 0001187147 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,019.8

Underlying: Common Stock · 30.29 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001062993-25-008657 · form4.xml · derivative · entry 1

Melvin Leland D · CIK 0001780421 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Underlying: Common Stock · 1,465 shares

Expires not disclosed

F1 · kind: 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.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

SEC source: 0001062993-25-008662 · form4.xml · derivative · entry 1

PIASECKI NICOLE WEYERHAEUSER · CIK 0001183850 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Underlying: Common Stock · 1,465 shares

Expires not disclosed

F1 · kind: 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.

F2 · derivative.exercise_date: 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 two years following termination of service on the Board of Directors.

F2 · derivative.expiration_date: 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 two years following termination of service on the Board of Directors.

SEC source: 0001062993-25-008661 · form4.xml · derivative · entry 3

NILAND BARBARA A · CIK 0001515130 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,465 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: RSUs vested immediately.

F2 · derivative.expiration_date: RSUs vested immediately.

SEC source: 0001062993-25-008661 · form4.xml · derivative · entry 2

NILAND BARBARA A · CIK 0001515130 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Underlying: Common Stock · 1,465 shares

Expires not disclosed

F1 · kind: 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.

F2 · derivative.exercise_date: RSUs vested immediately.

F2 · derivative.expiration_date: RSUs vested immediately.

SEC source: 0001062993-25-008661 · form4.xml · nonDerivative · entry 1

NILAND BARBARA A · CIK 0001515130 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,096

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001062993-25-008653 · form4.xml · derivative · entry 3

Krieg Kenneth J · CIK 0001477490 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,465 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: RSUs vested immediately.

F2 · derivative.expiration_date: RSUs vested immediately.

SEC source: 0001062993-25-008653 · form4.xml · derivative · entry 2

Krieg Kenneth J · CIK 0001477490 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Underlying: Common Stock · 1,465 shares

Expires not disclosed

F1 · kind: 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.

F2 · derivative.exercise_date: RSUs vested immediately.

F2 · derivative.expiration_date: RSUs vested immediately.

SEC source: 0001062993-25-008653 · form4.xml · nonDerivative · entry 1

Krieg Kenneth J · CIK 0001477490 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001062993-25-008649 · form4.xml · derivative · entry 1

JASKA JAMES M · CIK 0001187147 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,465

Underlying: Common Stock · 1,465 shares

Expires not disclosed

F1 · kind: 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.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.