BWX Technologies, Inc.

Rule 10b5-1 Trading Arrangements

During the three months ended September 30, 2025, no director or officer of the Company adopted orterminated a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) of Regulation S-K, except (i) on August 11, 2025, Rex Geveden, President and Chief Executive Officer and a director, entered into a trading plan (the "Geveden Plan") intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) and (ii) on August 28, 2025, Kevin McCoy, Chief Nuclear Officer, entered into a trading plan (the "McCoy Plan") intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). The Geveden Plan provides for the sale of an aggregate of up to 40,000 shares of common stock of the Company and terminates on August 14, 2026, unless terminated sooner in accordance with its terms. The McCoy Plan provides for the sale of an aggregate of up to 9,986 shares of common stock of the Company and terminates on August 31, 2026, unless terminated sooner in accordance with its terms.

Chief Accounting Officer Appointment

On October 29, 2025, the Company appointed Kevin J. Gorman as Vice President & Chief Accounting Officer of the Company, effective as of November 6, 2025. In connection with Mr. Gorman's appointment, Michael T. Fitzgerald, who currently serves as Chief Accounting Officer, will step down from this role as of November 6, 2025 but will remain employed as Senior Vice President and Chief Financial Officer of the Company.

Mr. Gorman has served as Corporate Controller of the Company since 2022. Prior to that, he served as Assistant Corporate Controller of the Company from 2015 to 2022 and in various controller roles within the Company's commercial nuclear energy business from 2011 to 2015. Prior to joining the Company, he worked for two years at The Shaw Group, Inc. in various accounting roles and 13 years at Deloitte & Touche LLP, most recently as Audit Senior Manager.