Company: BA
Filing Date: 2025-12-08
Form Type: S-8 POS
Source: 0001193125-25-311250
Chunk: 2

Company: BOEING CO
Filing Date: 2025-12-08
Form: S-8 POS
Chunk 2
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 Spirit RSU
were assumed and became an obligation with respect to the applicable Boeing Stock-Based RSU. For Spirit PSUs, the number of shares of Boeing Common Stock subject to each such Boeing Stock-Based RSU was determined by multiplying the total number of
shares of Spirit Common Stock subject to such Spirit PSU immediately prior to the Effective Time based on the attainment of the applicable performance metrics at the actual level of performance, determined as specified in the Merger Agreement,
multiplied by the Per Share Merger Consideration. Each such Boeing Stock-Based RSU is governed by the same terms and conditions (including vesting terms, but excluding performance conditions in the case of Spirit PSUs) as were applicable to such
Spirit RSU or Spirit PSU immediately prior to the Effective Time.

Boeing hereby amends the Form S-4 by filing
this Post-Effective Amendment relating to 158,023 shares of Boeing Common Stock, issuable pursuant to the Spirit AeroSystems Holdings, Inc. Amended and Restated 2014 Omnibus Incentive Plan (the “Plan”), related to the Spirit RSUs and
Spirit PSUs, originally granted under the Plan, that were converted to Boeing Stock-Based RSUs in connection with closing of the Merger. All such shares were previously registered on the Form S-4 but will be
subject to issuance pursuant to this Post-Effective Amendment.

PART I

INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

The documents containing the information specified in Part I will be delivered in accordance with Rule 428(b) under the Securities Act of 1933, as amended
(the “Securities Act”). Such documents are not required to be, and are not, filed with the Commission, either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities
Act.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference.

The following documents, which have been filed by the Company with the Commission, are incorporated in this Registration Statement by reference:

(a) the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024, filed with the Commission on February 3, 2025;

(b) the Company’s Quarterly Reports on Form 10-Q for the fiscal quarters ended March31, 2025, filed with the Commission on April 23, 2025, June30, 2025, filed with the