UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 12, 2025

Spirit AeroSystems Holdings, Inc.

(Exact name of registrant as specified in its charter)

3801 South Oliver, Wichita, KS 67210

(Address of principal executive offices) (Zip Code)

(Registrant’s telephone number, including area code): (316) 526-9000

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

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. ¨

Item 8.01 Other Events.

On May 12, 2025, Spirit AeroSystems Holdings, Inc. (“Spirit”) announced that it has received a private letter ruling from the Internal Revenue Service (the “IRS”) relating to the tax treatment of the proposed merger pursuant to the Agreement and Plan of Merger (the “Merger Agreement”) entered into by Spirit, The Boeing Company (“Boeing”) and Sphere Acquisition Corp. on June 30, 2024 (the “Merger”). In the private letter ruling, which was not a condition to the completion of the Merger, the IRS ruled, among other things, that (i) the Merger will qualify as a “reorganization” under Section 368(a)(1)(B) of the Internal Revenue Code of 1986, as amended (the “Code”), and (ii) no gain or loss will be recognized by holders of Spirit common stock upon receipt of Boeing common stock in exchange for their Spirit common stock, except as relates to the receipt of cash in lieu of fractional shares.

Accordingly, Spirit expects that Boeing and Spirit will report the Merger for U.S. federal income tax purposes in a manner consistent with the qualification of the Merger as a “reorganization” under Section 368(a) of the Code.

While generally binding upon the IRS, the private letter ruling is subject to certain caveats, and there are certain limitations in relying upon private letter rulings. These caveats and limitations are described in the definitive proxy statement/prospectus, filed by Spirit with the Securities and Exchange Commission on December 20, 2024, relating to the special meeting of holders of Spirit common stock that was held on January 31, 2025 in connection with the Merger.

In all events, each holder of Spirit common stock should consult such holder’s own tax advisor with respect to the particular tax consequences of the Merger to such holder.

Cautionary Statement Regarding Forward-Looking Statements

This report includes “forward-looking statements” that involve many risks and uncertainties. Forward-looking statements generally can be identified by the use of forward-looking terminology such as “aim,” “anticipate,” “believe,” “could,” “continue,” “designed,” “ensure,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “might,” “model,” “objective,” “outlook,” “plan,” “potential,” “predict,” “project,” “seek,” “should,” “target,” “will,” “would,” and other similar words, or phrases, or the negative thereof, unless the context requires otherwise. These statements reflect management’s current views with respect to future events and are subject to risks and uncertainties, both known and unknown, including, but not limited to, those described in the “Risk Factors” sections of Spirit’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the SEC on February 28, 2025 (the “2024 Form 10-K”), and subsequent Quarterly Reports on Form 10-Q. Our actual results may vary materially from those anticipated in forward-looking statements. We caution investors not to place undue reliance on any forward-looking statements.

Important factors that could cause actual results to differ materially from those reflected in the forward-looking statements include risks and uncertainties relating to the Merger and the transactions contemplated by our stock and asset purchase agreement with Airbus SE (the “Airbus Business Disposition” and, together with the Merger, the “Transactions”), including, among others, the possible inability of the parties to a Transaction to obtain the required regulatory approvals for such Transaction and to satisfy the other conditions to the closing of such Transaction on a timely basis or at all; the possible occurrence of events that may give rise to a right of one or more of the parties to the Merger Agreement or the agreement for the Airbus Business Disposition to terminate such agreement; the risk that we are unable to consummate the Transactions on a timely basis or at all for any reason, including, without limitation, failure to obtain the required regulatory approvals, or failure to satisfy other conditions to the closing of either of the Transactions; the potential for the pendency of the Transactions or any failure to consummate the Transactions to adversely affect the market price of Spirit common stock or our financial performance or business relationships; risks relating to the value of Boeing common stock to be issued in the Merger; the possibility that the anticipated benefits of the Transactions cannot be realized in full or at all or may take longer to realize than expected; the possibility that costs or difficulties related to the integration of our operations with those of Boeing will be greater than expected; risks relating to significant transaction costs; the intended or actual tax treatment of the Transactions; litigation or other legal or regulatory action relating to the Transactions or otherwise relating to us or other parties to the Transactions instituted against us or such other parties or Spirit’s or such other parties’ respective directors and officers and the effect of the outcome of any such litigation or other legal or regulatory action; risks associated with contracts containing provisions that may be triggered by the Transactions; potential difficulties in retaining and hiring key personnel or arising in connection with labor disputes during the pendency of or following the Transactions; the risk of other Transaction-related disruptions to our business, including business plans and operations; the potential for the Transactions to divert the time and attention of management from ongoing business operations; the potential for contractual restrictions under the agreements relating to the Transactions to adversely affect our ability to pursue other business opportunities or strategic transactions; and competitors’ responses to the Transactions.

Additional important factors that could cause actual results to differ materially from those reflected in the forward-looking statements and that should be considered in evaluating the our outlook include, but are not limited to, the following: our ability to continue as a going concern and satisfy our liquidity needs, the success of our liquidity enhancement plans, operational and efficiency initiatives, our ability to access the capital and credit markets (including as a result of any contractual limitations, including under the Merger Agreement), the outcomes of discussions related to the timing or amounts of repayment for certain customer advances, and the costs and terms of any additional financing; the continued fragility of the global aerospace supply chain including our dependence on our suppliers, as well as the cost and availability of raw materials and purchased components, including increases in energy, freight, and other raw material costs as a result of inflation or continued global inflationary pressures; our ability and our suppliers’ ability and willingness to meet stringent delivery (including quality and timeliness) standards and accommodate changes in the build rates or model mix of aircraft under existing contractual commitments, including the ability or willingness to staff appropriately or expend capital for current production volumes and anticipated production volume increases; our ability to maintain continuing, uninterrupted production at our manufacturing facilities and our suppliers’ facilities; our ability, and our suppliers’ ability, to attract and retain the skilled work force necessary for production and development in an extremely competitive market; the effect of economic conditions, including increases in interest rates and inflation, on the demand for our and our customers’ products and services, on the industries and markets in which we operate in the U.S. and globally, and on the global aerospace supply chain; the general effect of geopolitical conditions, including Russia’s invasion of Ukraine and the resultant sanctions being imposed in response to the conflict, including any trade and transport restrictions; the conflict in the Middle East could impact certain suppliers’ ability to continue production or make timely deliveries of supplies required to produce and timely deliver our products, and may result in sanctions being imposed in response to the conflict, including trade and transport restrictions; our relationships with the unions representing many of our employees, including our ability to successfully negotiate new agreements, and avoid labor disputes and work stoppages with respect to our union-represented employees; the impact of significant health events, such as pandemics, contagions or other public health emergencies (including the COVID-19 pandemic) or fear of such events, on the demand for our and our customers’ products and services, and on the industries and markets in which we operate in the U.S. and globally; the timing and conditions surrounding the full worldwide return to service (including receiving the remaining regulatory approvals) of the B737 MAX, future demand for the aircraft, and any residual impacts of the B737 MAX grounding on production rates for the aircraft; our reliance on Boeing and Airbus SE and its affiliates for a significant portion of our revenues; the business condition and liquidity of our customers and their ability to satisfy their contractual obligations to the Company; the certainty of our backlog, including the ability of customers to cancel or delay orders prior to shipment on short notice, and the potential impact of regulatory approvals of existing and derivative models; our ability to accurately estimate and manage performance, cost, margins, and revenue under our contracts, and the potential for additional forward losses on new and maturing programs; our accounting estimates for revenue and costs for our contracts and potential changes to those estimates; our ability to continue to grow and diversify our business, execute our growth strategy, and secure replacement programs, including our ability to enter into profitable supply arrangements with additional customers; the outcome of product warranty or defective product claims and the impact settlement of such claims may have on our accounting assumptions; competitive conditions in the markets in which we operate, including in-sourcing by commercial aerospace original equipment manufacturers; our ability to successfully negotiate, or re-negotiate, future pricing under our supply agreements with Boeing, Airbus SE and its affiliates and other customers; the possibility that our cash flows may not be adequate for our additional capital needs; any reduction in our credit ratings; our ability to avoid or recover from cyber or other security attacks and other operations disruptions; legislative or regulatory actions, both domestic and foreign, impacting our operations, including the effect of changes in tax laws and rates and our ability to accurately calculate and estimate the effect of such changes; spending by the U.S. and other governments on defense; pension plan assumptions and future contributions; the effectiveness of our internal control over financial reporting; the outcome or impact of ongoing or future litigation, arbitration, claims, and regulatory actions or investigations, including our exposure to potential product liability and warranty claims; adequacy of our insurance coverage; our ability to continue selling certain receivables through our receivables financing programs; our ability to effectively integrate recent acquisitions, along with other acquisitions we pursue, and generate synergies and other cost savings therefrom, while avoiding unexpected costs, charges, expenses, and adverse changes to business relationships and business disruptions; and the risks of doing business internationally, including fluctuations in foreign currency exchange rates, impositions of tariffs or embargoes, trade restrictions, compliance with foreign laws and domestic and foreign government policies, the impact of trade disputes and changes to trade policies, including the imposition of new or increased tariffs, retaliatory tariffs or other trade restrictions.

These factors are not exhaustive, and it is not possible for us to predict all factors that could cause actual results to differ materially from those reflected in our forward-looking statements. These factors speak only as of the date hereof, and new factors may emerge or changes to the foregoing factors may occur that could impact our business. As with any projection or forecast, these statements are inherently susceptible to uncertainty and changes in circumstances. Except to the extent required by law, we undertake no obligation to, and expressly disclaim any obligation to, publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise. You should review carefully the sections captioned “Risk Factors” in the 2024 Form 10-K and Spirit’s subsequent Quarterly Reports on Form 10-Q for a more complete discussion of these and other factors that may affect our business or the Transactions.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.