BWX Technologies, Inc.

We share in the ownership of a variety of entities with third parties, primarily through corporations, limited liability companies and partnerships, which we refer to as "joint ventures." The majority of our joint venture arrangements are within our Government Operations segment and are primarily used to manage and operate nuclear facilities and associated plant infrastructure, constructs large capital facilities, provides safeguards and security for inventory and assets, supports and conducts research and development for advanced energy technology and manages environmental programs for the DOE, the NNSA and NASA. We generally account for our investments in joint ventures under the equity method of accounting. Certain of our unconsolidated joint ventures are described below.

•Los Alamos Legacy Cleanup Contract. Newport News Nuclear BWXT – Los Alamos, LLC, a limited liability company formed by Stoller Newport News Nuclear, Inc., a subsidiary of Huntington Ingalls Industries, Inc.'s Technical Solutions division, and BWXT Technical Services Group, Inc. ("BWXT TSG"), was awarded a contract to perform environmental monitoring and remediation, waste management and disposition, and decontamination and decommissioning at the Los Alamos National Laboratory site and surrounding private and government-owned lands.

•Lawrence Livermore National Laboratory. Lawrence Livermore National Security, LLC, a limited liability company formed by the University of California, Bechtel National, Inc., Amentum Environment & Energy, Inc. and BWXT Government Group, Inc., manages and operates Lawrence Livermore National Laboratory located in Livermore, California. The laboratory serves as a national resource in science and engineering, focused on national security, energy, the environment and bioscience, with special responsibility for nuclear devices.

•Savannah River Integrated Mission Completion Contract. Savannah River Mission Completion, LLC, a limited liability company formed by BWXT TSG, Amentum Environment & Energy, Inc. and Fluor Federal Services, Inc. was awarded a contract to receive, store, treat and dispose of radioactive liquid waste for the DOE at the Savannah River Site located in Aiken, South Carolina.

•Portsmouth Gaseous Diffusion Plant D&D. Fluor-BWXT Portsmouth LLC is a limited liability company formed by Fluor Federal Services, Inc. and BWXT TSG to provide nuclear operations, decontamination and decommissioning services at the Portsmouth Gaseous Diffusion Plant in Portsmouth, Ohio. A follow-on contract was awarded by the DOE to another contractor and transition was completed in September 2025.

•West Valley Demonstration Project Phase I Decommissioning and Facility Disposition. CH2M Hill-BWXT West Valley, LLC is a limited liability company formed by Amentum Environment & Energy, Inc. (formerly CH2M Hill Constructors, Inc.), BWXT TSG and Environmental Chemical Corporation. Services provided include project management and support services, site operations, maintenance, utilities, high-level waste canister relocation, facility disposition, waste tank farm management, U.S. Nuclear Regulatory Commission ("NRC") licensed disposal area management, waste management and nuclear materials disposition, and safeguards and security. A follow-on contract [Phase 1B] was awarded to a BWXT-led team and the CHBWV Phase 1 contract concluded on June 23, 2025.

•West Valley Demonstration Project Phase 1B. West Valley Cleanup Alliance, LLC is a limited liability company formed by BWXT TSG, Jacobs Technology, Inc. and Geosyntec Consultants, Inc. to achieve significant risk and financial liability reduction and provide the best overall optimal solution for accelerated completion and closure of the site near West Valley, New York. The Phase 1B contract began on June 24, 2025 and will continue the current cleanup mission and will include the demolition of remaining components of the main plant process building, soil remediation and disposition, waste management and disposition, environmental monitoring, surveillance and maintenance and program support activities.

•Synergy Achieving Consolidated Operations & Maintenance (SACOM). Syncom Space Services, LLC is a limited liability company formed by PAE Applied Technologies, LLC (acquired by Amentum in 2022) and BWXT Nuclear Operations Group, Inc. to provide facility operations and maintenance services for institutional and technical facilities, and perform test and manufacturing support services at two NASA facilities – the Stennis Space Center in Hancock County, Mississippi and the Michoud Assembly Facility in New Orleans, Louisiana. A reduced scope, follow-on contract was awarded by NASA to another contractor in 2024 and transition was completed in June 2025.

•Paducah Gaseous Diffusion Plant Deactivation and Remediation Project. Four Rivers Nuclear Partnership, LLC is a limited liability company formed by Amentum Environment & Energy, Inc. (formerly CH2M Hill Constructors, Inc.), BWXT TSG and Fluor Federal Services, Inc. to provide nuclear operations, deactivation and remediation services at the Paducah Gaseous Diffusion Plant in Paducah, Kentucky.

•Pantex Plant. PanTeXas Deterrence, LLC is a limited liability company formed by BWXT TSG, Fluor Federal Services, Inc, SOC LLC and The Texas A&M University System to provide nuclear production operations services, long-term plant modernization and capability enhancement/stewardship along with other required services to support the NNSA and broader national security requirements assigned to the Pantex Plant near Amarillo, Texas.

•Hanford Integrated Tank Disposition Contract. Hanford Tank Waste Operations & Closure, LLC is a limited liability company formed by BWXT TSG, Amentum Environment & Energy, Inc. and Fluor Federal Services, Inc. to achieve significant risk and financial liability reduction through accelerated cleanup of high-risk waste at the DOE-owned Hanford Tank Farms near Richland, Washington.

•Strategic Petroleum Reserve Contract. Strategic Storage Partners, LLC (SSP) is a limited liability company formed by APTIM and BWXT TSG to manage and operate the United States’ strategic crude oil storage facilities, including operations, logistics, maintenance, major maintenance, and life extension activities while still preserving drawdown readiness. The contract began on November 24, 2025.

•Canadian National Laboratory Management and Operations Contract. Nuclear Laboratory Partners of Canada, Inc. (NLPC) is a company formed by BWXT Government Group, Kinectrics, Inc., and Amentum Environment & Energy, Inc. to manage and operate the Canadian National Laboratory. The contract began on December 11, 2025.

•Isogen. Isogen is a joint venture between Framatome and Kinectrics to use CANDU nuclear reactors to provide irradiation services to isotope processors and radiopharmaceutical manufactures to deliver them with a reliable supply of medical isotopes. This joint venture was created prior to BWXT's acquisition of Kinectrics in 2025.