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For the transition period from                      to                     .

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Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

The number of shares of the registrant's common stock outstanding at May 1, 2025 was 91,360,726.

We have presented the condensed consolidated financial statements of BWX Technologies, Inc. ("BWXT" or the "Company") in U.S. dollars in accordance with the interim reporting requirements of Form 10-Q, Rule 10-01 of Regulation S-X and accounting principles generally accepted in the United States ("GAAP"). Certain financial information and disclosures normally included in our financial statements prepared annually in accordance with GAAP have been condensed or omitted. Readers of these financial statements should, therefore, refer to the consolidated financial statements and notes in our annual report on Form 10-K for the year ended December 31, 2024 (our "2024 10-K"). We have included all adjustments, in the opinion of management, consisting only of normal recurring adjustments, necessary for a fair presentation.

We use the equity method to account for investments in entities that we do not control, but over which we have the ability to exercise significant influence. We generally refer to these entities as "joint ventures." We have eliminated all intercompany transactions and accounts. We classify assets and liabilities related to long-term contracts as current using the duration of the related contract or program as our operating cycle, which is generally longer than one year. We have recast certain amounts previously reported in our condensed consolidated balance sheets and statements of cash flows to conform to the presentation at March 31, 2025. We present the notes to our condensed consolidated financial statements on the basis of continuing operations, unless otherwise stated.

Unless the context otherwise indicates, "we," "us" and "our" mean BWXT and its consolidated subsidiaries.

We operate in two reportable segments: Government Operations and Commercial Operations. Our reportable segments are further described as follows:

•Our Government Operations segment manufactures naval nuclear reactors, including the related nuclear fuel, for the U.S. Naval Nuclear Propulsion Program for use in submarines and aircraft carriers. Through this segment, we also fabricate fuel-bearing precision components that range in weight from a few grams to hundreds of tons, manufacture electromechanical equipment, perform design, manufacturing, inspection, assembly and testing activities, downblend Cold War-era government stockpiles of high-enriched uranium and develop and manufacture advanced materials and products for commercial, military and space applications. In addition, we supply proprietary and sole-source valves, manifolds and fittings to global naval and commercial shipping customers. In-house capabilities also include wet chemistry uranium processing, advanced heat treatment to optimize component material properties and a controlled, clean-room environment with the capacity to assemble railcar-size components. This segment also provides various other services, primarily through joint ventures, to the U.S. Government including nuclear materials management and operation, environmental management and administrative and operating services for various U.S. Government-owned facilities. These services are primarily provided to the U.S. Department of Energy ("DOE"), including the National Nuclear Security Administration, the Office of Nuclear Energy, the Office of Science and the Office of Environmental Management, the Department of Defense and NASA. In addition, this segment also develops technology for advanced nuclear reactors for a variety of power and propulsion applications in the space and terrestrial domains and offers complete advanced nuclear fuel and reactor design and engineering, licensing and manufacturing services for these programs.

•Our Commercial Operations segment fabricates commercial nuclear steam generators, nuclear fuel, fuel handling systems, pressure vessels, reactor components, heat exchangers, tooling delivery systems and other auxiliary equipment, including containers for the storage of spent nuclear fuel and other high-level waste, and supplies nuclear-grade materials and precisely machined components for nuclear utility customers. We have supplied the nuclear industry with more than 1,300 large, heavy components worldwide and are the only commercial heavy nuclear component manufacturer in North America. This segment also provides specialized engineering services that include structural component design, 3-D thermal-hydraulic engineering analysis, weld and robotic process development, electrical and controls engineering and metallurgy and materials engineering. In addition, this segment offers in-plant inspection, maintenance and modification services for nuclear steam generators, heat exchangers, reactors, fuel handling systems and balance of plant equipment, as well as specialized non-destructive examination and tooling/repair solutions. This segment also manufactures medical radioisotopes, radiopharmaceuticals and medical devices, and partners with life science and pharmaceutical companies developing new drugs.

See Note 8 and Note 3 for financial information about our segments. Operating results for the three months ended March 31, 2025 are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. For further information, refer to the consolidated financial statements and notes included in our 2024 10-K.

There were no accounting standards adopted during the three months ended March 31, 2025 that had a significant impact on our financial position, results of operations, cash flows or disclosures.

We generally recognize contract revenues and related costs over time for individual performance obligations based on a cost-to-cost method in accordance with Financial Accounting Standards Board ("FASB") Topic Revenue from Contracts with Customers. We recognize estimated contract revenue and resulting income based on the measurement of the extent of progress toward completion as a percentage of the total project. Certain costs may be excluded from the cost-to-cost method of measuring progress, such as significant costs for uninstalled materials, if such costs do not depict our performance in transferring control of goods or services to the customer. We review contract price and cost estimates periodically as the work progresses and reflect adjustments proportionate to the percentage-of-completion in income in the period when those estimates are revised. We recognize revenue on certain cost plus and time and materials contracts equal to the amount we have the right to invoice the customer when performance obligations are satisfied over time and the invoice amount corresponds directly with the value we are providing the customer. Certain of our contracts recognize revenue at a point in time, and revenue on these contracts is recognized when control transfers to the customer. The majority of our revenue that is recognized at a point in time is related to parts and certain medical radioisotopes and radiopharmaceuticals in our Commercial Operations segment. For all contracts, if a current estimate of total contract cost indicates a loss on a contract, the projected loss is recognized in full when determined.

See Note 3 for a further discussion of revenue recognition.

We are subject to federal income tax in the U.S., Canada and the U.K., as well as income tax within multiple U.S. state jurisdictions. We provide for income taxes based on the enacted tax laws and rates in the jurisdictions in which we conduct our operations. These jurisdictions may have regimes of taxation that vary with respect to nominal rates and with respect to the basis on which these rates are applied. This variation, along with changes in our mix of income within these jurisdictions, can contribute to shifts in our effective tax rate from period to period.

Our effective tax rate for the three months ended March 31, 2025 was 17.7% as compared to 22.5% for the three months ended March 31, 2024. The effective tax rates for the three months ended March 31, 2025 was lower than the U.S. corporate income tax rate of 21% primarily due to excess tax benefits associated with equity compensation. The effective tax rate for the three months ended March 31, 2024 was higher than the U.S. corporate income tax rate of 21% primarily due to state income taxes within the U.S. and the unfavorable rate differential associated with our foreign earnings.

The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents on our condensed consolidated balance sheets to the totals presented on our condensed consolidated statements of cash flows:

At March 31, 2025 and December 31, 2024, we had inventories totaling $49.6 million and $40.3 million, respectively, consisting almost entirely of raw materials and supplies.

Property, plant and equipment is stated at cost and is set forth below:

The components of Accumulated other comprehensive income (loss) included in Stockholders' Equity are as follows:

The amounts reclassified out of Accumulated other comprehensive income (loss) by component and the affected condensed consolidated statements of income line items are as follows:

Our operations give rise to exposure to market risks from changes in foreign currency exchange ("FX") rates. We use derivative financial instruments, primarily FX forward contracts, to reduce the impact of changes in FX rates on our operating results. We use these instruments to hedge our exposure associated with revenues or costs on our long-term contracts and other transactions that are denominated in currencies other than our operating entities' functional currencies. We do not hold or issue derivative financial instruments for trading or other speculative purposes.

We enter into derivative financial instruments primarily as hedges of certain firm purchase and sale commitments and loans between domestic and foreign subsidiaries denominated in foreign currencies. We record these contracts at fair value on our condensed consolidated balance sheets. Based on the hedge designation at the inception of the contract, the related gains and losses on these contracts are deferred in stockholders' equity as a component of Accumulated other comprehensive income (loss) until the hedged item is recognized in earnings. The gain or loss on a derivative instrument not designated as a hedging instrument is immediately recognized in earnings. Gains and losses on derivative financial instruments that require immediate recognition are included as a component of Other – net on our condensed consolidated statements of income and are recorded in our condensed consolidated statements of cash flows based on the nature and use of the instruments.

We have designated the majority of our FX forward contracts that qualify for hedge accounting as cash flow hedges. The hedged risk is the risk of changes in functional-currency-equivalent cash flows attributable to changes in FX spot rates of forecasted transactions primarily related to long-term contracts. We exclude from our assessment of effectiveness the portion of the fair value of the FX forward contracts attributable to the difference between FX spot rates and FX forward rates. At March 31, 2025, we had deferred approximately $1.0 million of net gains on these derivative financial instruments. Assuming market conditions continue, we expect to recognize the majority of this amount in the next 12 months. For the three months ended March 31, 2025 and 2024, we recognized gains of $1.7 million and $9.7 million, respectively, in Other – net on our condensed consolidated statements of income associated with FX forward contracts not designated as hedging instruments.

At March 31, 2025, our derivative financial instruments consisted of FX forward contracts with a total notional value of $388.3 million with maturities extending to July 2026. These instruments consist primarily of FX forward contracts to purchase or sell Canadian dollars and Euros. We are exposed to credit-related losses in the event of non-performance by counterparties to derivative financial instruments. We attempt to mitigate this risk by using major financial institutions with high credit ratings. Our counterparties to derivative financial instruments have the benefit of the same collateral arrangements and covenants as described under our credit facility.

In December 2023, the FASB issued updates to Topic Income Taxes to provide, on an annual basis, disaggregated disclosures with respect to the reconciliation of our effective tax rate, as well as a disaggregation of income taxes paid, net of

refunds received. The new standard is effective on a prospective basis for annual periods beginning after December 15, 2024. We are currently evaluating the impact of the adoption of this standard and expect that it will only require changes to our disclosures with no impact on our results of operations, financial position or cash flows.

In November 2024, the FASB issued updates to Topic Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures: Disaggregation of Income Statement Expenses. These updates require a public entity to disclose additional information about specific expense categories in the notes to financial statements on an annual and interim basis. The updates are effective for annual periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027, with early adoption permitted. A public entity may apply these amendments on a prospective basis or retrospectively to any or all prior periods presented in the financial statements. We are currently evaluating the impact of the adoption of this standard and expect that it will only require changes to our disclosures with no impact on our results of operations, financial position or cash flows.

NOTE 2 - ACQUISITIONS

On January 3, 2025, we acquired all of the equity interests of Aerojet Ordnance Tennessee, Inc. ("A.O.T."), a subsidiary of L3Harris Technologies, Inc. for approximately $103.3 million, subject to certain working capital adjustments. A.O.T. is a leading provider of advanced special materials which will further enhance our capabilities to develop and manufacture advanced materials and products for commercial, military and space applications. A.O.T. is reported as part of our Government Operations segment. Our preliminary purchase price allocation resulted in the recognition of $61.6 million of Goodwill, $25.1 million of Intangible Assets and $13.0 million of Property, Plant and Equipment. The assets acquired and liabilities assumed have been recorded at preliminary estimates of fair value as determined by management, based on information currently available and on current assumptions of future operations, and are subject to change upon completion of acquisition accounting.

The intangible assets included above consist of the following (dollar amounts in thousands):

On December 27, 2024, we entered into an agreement to acquire Kinectrics Holdings Inc., the parent company of

Kinectrics Inc. ("Kinectrics") for approximately CAD 782.7 million subject to certain working capital adjustments. This

acquisition is targeted to close in the middle of 2025, following necessary regulatory and other approvals. Kinectrics is a leader in providing lifecycle management services for the global nuclear power and transmission and distribution markets and in the production and supply of isotopes for the radiopharmaceutical industry and employs over 1,300 employees located across 20 sites worldwide. Following the close, Kinectrics will be reported as part of our Commercial Operations segment. Due to the pending nature of this transaction, we have not initiated a preliminary purchase price allocation as of the date of this filing.

As described in Note 1, our operations are assessed based on two reportable segments.

Revenues by geographic area and customer type were as follows:

Revenues by timing of transfer of goods or services were as follows:

Revenues by contract type were as follows:

As we progress on our contracts and the underlying performance obligations for which we recognize revenue over time, we refine our estimates of variable consideration and total estimated costs at completion, which impact the overall profitability on our contracts and performance obligations. Changes in these estimates result in the recognition of cumulative catch-up adjustments that impact our revenues and/or costs of contracts. The aggregate impact of changes in estimates decreased our revenues and operating income as follows:

(1)During the three months ended March 31, 2025 and 2024, no adjustments to any one contract had a material impact on our consolidated financial statements.

We include revenues and related costs incurred, plus accumulated contract costs that exceed amounts invoiced to customers under the terms of the contracts, in Contracts in progress. Costs specific to certain contracts for which we recognize revenue at a point in time are also included in Contracts in progress. We include in Advance billings on contracts billings that exceed accumulated contract costs and revenues recognized over time. Amounts that are withheld on our fixed-price incentive fee contracts are classified within Retainages. Certain of these amounts require conditions other than the passage of time to be achieved, with the remaining amounts only requiring the passage of time. Most long-term contracts contain provisions for progress payments. Our unbilled receivables do not contain an allowance for credit losses as we expect to invoice customers and collect all amounts for unbilled receivables. Changes in Contracts in progress and Advance billings on contracts are primarily driven by differences in the timing of revenue recognition and billings to our customers. Our fixed-price incentive fee contracts for our Government Operations segment include provisions that result in an increase in retainages on contracts during the first and third quarters of the year, with larger payments received during the second and fourth quarters. Retainages also vary as a result of timing differences between incurring costs and achieving milestones that allow us to recover these amounts.

During the three months ended March 31, 2025 and 2024, we recognized $69.5 million and $42.8 million, respectively, of revenues that were in Advance billings on contracts at the beginning of each year.

Remaining performance obligations represent the dollar amount of revenue we expect to recognize in the future from performance obligations on contracts previously awarded and in progress. At March 31, 2025, our remaining performance obligations were $4,878.7 million. We expect to recognize approximately 61% of the revenue associated with our remaining performance obligations by the end of 2026, with the remainder to be recognized thereafter.

We record the service cost component of net periodic benefit cost within Operating income on our condensed consolidated statements of income. For the three months ended March 31, 2025 and 2024, these amounts were $1.8 million and $2.1 million, respectively. All other components of net periodic benefit cost are included in Other – net within the condensed consolidated statements of income. For the three months ended March 31, 2025 and 2024, these amounts were $(1.7) million and $(3.0) million, respectively. Components of net periodic benefit cost included in net income were as follows:

There were no material contingencies during the period covered by this Form 10-Q.

The following is a summary of our investments measured at fair value at March 31, 2025:

The following is a summary of our investments measured at fair value at December 31, 2024:

We estimate the fair value of investments based on quoted market prices. For investments for which there are no quoted market prices, we derive fair values from available yield curves for investments of similar quality and terms.

Level 2 derivative assets and liabilities currently consist of FX forward contracts. Where applicable, the value of these derivative assets and liabilities is computed by discounting the projected future cash flow amounts to present value using market-based observable inputs, including FX forward and spot rates, interest rates and counterparty performance risk adjustments. At March 31, 2025 and December 31, 2024, we had FX forward contracts outstanding to purchase or sell foreign currencies, primarily Canadian dollars and Euros, with a total fair value of $2.1 million and $8.2 million, respectively. Derivative assets and liabilities are included in Accounts receivable – other and Accounts payable, respectively, on our condensed consolidated balance sheets.

We used the following methods and assumptions in estimating our fair value disclosures for our other financial instruments, as follows:

Cash and cash equivalents and restricted cash and cash equivalents. The carrying amounts that we have reported in the accompanying condensed consolidated balance sheets for Cash and cash equivalents and Restricted cash and cash equivalents approximate their fair values due to their highly liquid nature.

Long-term and short-term debt. We base the fair values of debt instruments, including our 4.125% senior notes due 2028 (the "Senior Notes due 2028") and our 4.125% senior notes due 2029 (the "Senior Notes due 2029"), on quoted market prices. Where quoted prices are not available, we base the fair values on the present value of future cash flows discounted at estimated borrowing rates for similar debt instruments or on estimated prices based on current yields for debt issues of similar quality and terms. At March 31, 2025 and December 31, 2024, the fair value of the Senior Notes due 2028 was $377.7 million and $374.6 million, respectively, and the fair value of the Senior Notes due 2029 was $372.8 million and $371.9 million, respectively. The fair value of our remaining debt instruments approximated their carrying values at March 31, 2025 and December 31, 2024.

Note receivable. Included in Other current assets is a note receivable related to a third-party loan. We base the fair value of this level 2 note receivable instrument on the present value of future cash flows discounted at market interest rates for financial instruments with similar quality and terms. At March 31, 2025 and December 31, 2024, the carrying value of our note receivable was $6.4 million and $$6.5 million, respectively, and approximated its fair value.

Stock-based compensation recognized for all of our plans for the three months ended March 31, 2025 and 2024 totaled $5.0 million and $4.4 million, respectively, with associated tax benefit totaling $1.0 million and $0.7 million, respectively.

As described in Note 1, our operations are assessed based on two reportable segments. An analysis of our operations by reportable segment is as follows: