The following description of The Boeing Company 401(k) Retirement Plan (the “Plan”) provides only general information. Participants, as defined by the Plan (“Members” or “Participants”), should refer to the plan document for a more complete description of the Plan’s provisions.

General — The Plan is a defined contribution plan intended to qualify under the Internal Revenue Code (“IRC”) as a profit sharing plan with a cash or deferred arrangement and employee stock ownership plan component, and is designed to provide Members with a means of making regular savings for their retirement. An eligible employee of The Boeing Company (the “Company” or “Boeing”) or one of its adopting subsidiaries becomes eligible to participate on the first day of employment.

The Plan includes an auto-enrollment provision for newly-eligible employees unless they affirmatively elect not to participate in the Plan. Automatically enrolled Members have their deferral rate set at a percentage of eligible compensation as defined in the plan document and their contributions are invested in a qualified default investment alternative (“QDIA”) until changed by the Members. The current QDIA for the Plan is the applicable custom target date fund.

The assets of the Plan, excluding notes receivable from participants, are held in The Boeing Company Employee Savings Plans Master Trust (the “Master Trust”). The Northern Trust Company (“NT”) serves as trustee for the Master Trust. The Employee Benefit Plans Committee oversees the operation and administration of the Plan. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended.

Contributions — Members may elect to contribute to the Plan a percentage of their eligible compensation through either pretax, after-tax, or Roth contributions, or a combination of those contribution types, as defined in the plan document and subject to statutory limitations. Members who have attained age 50 before the end of the plan year are eligible to make catch-up contributions, as defined in the plan document and subject to statutory limits. The Plan also accepts certain rollover contributions.

Under the terms of the Plan, Boeing makes employer matching and Company contributions for eligible Members. Catch-up contributions are ineligible for an employer matching contribution for certain Members. During 2025 and 2024, Boeing’s contributions were made in the form of shares of Company common stock and immediately transferred to other investment funds in accordance with Members’ current investment elections.

Members may elect to change their contribution percentages. These changes are effective the next pay period after the request is received, or as soon as administratively possible thereafter. The allocation of both Members’ contributions and employer contributions to the funds may be changed at any time and become effective on the day of the change or the next business day, according to the time of the request for a change in relation to the stock market close of business.

Members’ Accounts — Individual accounts are maintained for each Member. Each Member’s account is credited with the Member’s contributions, Boeing’s contributions, and allocations of Plan earnings (losses) from the funds in which the account is invested. Each Member’s account is charged with an allocation of certain administrative and investment-related expenses, and Member-specific charges, if applicable. Allocations are based on Member earnings or account balances, as defined by the plan document. The benefit to which a Member is entitled is the benefit that can be provided from the Member’s account.

Investment Funds — Upon enrollment in the Plan, Members may direct the investment of their contributions and any employer contributions to the investment funds offered under the Plan. These investment funds consisted of common/collective trusts, separately managed U.S. equity accounts, separately managed non-U.S. equity accounts, a separately managed fixed-income account, custom target date funds, a stable value fund (composed of synthetic-guaranteed investment contracts (“synthetic GICs”)), and Boeing common stock, which is the Boeing Stock Fund, as of December 31, 2025 and 2024. The Boeing Stock Fund consists of Boeing common stock and cash held in the cash sweep fund. Members may elect that dividends received with respect to their investments in the Boeing Stock Fund be distributed to them in cash or reinvested in the Boeing Stock Fund (a dividend payout program). Investment funds are valued daily and Members may elect to change their investment allocations on a daily basis.

Withdrawals — Members may elect to withdraw all or a portion of their accounts, at any time on or after the day the Member attains age 59 1/2. If a Member is under age 59 1/2, withdrawals from his or her accounts are subject to restrictions for certain accounts and certain hardship rules as provided by the Plan. If a Member takes a hardship withdrawal, the Member may continue contributions to the Plan; however, for certain Members, employer matching contributions will be suspended for six months following the hardship withdrawal.

In addition, a Member may elect to withdraw all or part of his or her employer matching contribution account before the Member attains age 59 1/2, but only if the Member has attained his or her fifth anniversary of employment. If such a withdrawal is made, employer matching contributions will generally be suspended for six months following the withdrawal. Company contributions may be fully withdrawn upon termination of employment. Withdrawals of after-tax contributions and rollover contributions can be made at any time. Effective August 1, 2025, employer match or after-tax withdrawals cannot be made if a Member (excluding certain unions) has taken an employer match or after-tax withdrawal, respectively, during the preceding six-month period. Qualified reservist distributions, active military leave distributions, withdrawals upon disability, qualified birth and adoption withdrawals, domestic abuse withdrawals, emergency personal expense withdrawals, and qualified disaster recovery withdrawals are also available to eligible Members.

In the event of illness or injury and if eligible Members have used all of their regular sick leave benefits, the eligible Members may elect to withdraw, subject to Plan requirements, all or a portion of their salary continuation balance, if applicable.

Notes Receivable from Participants — Members may borrow from their fund accounts a minimum of one thousand dollars up to a maximum equal to the lesser of fifty thousand dollars or 50% of their account balance (subject to restrictions for certain accounts and minus any current outstanding loan balance), reduced by the highest outstanding loan balance under all of the Company’s savings plans during the last 12 months. Members may generally have a maximum of two loans outstanding under the Plan at any time. Loans may be additionally limited in accordance with the Plan provisions and/or loan policies and procedures. The interest rate on new loans is set every month and is equal to the prime rate published in the Wall Street Journal as of the last business day of the calendar month immediately preceding the date of the loan. Interest rates on outstanding loans ranged from 3.25% to 9.50% at December 31, 2025, with loans maturing at various dates through December 2045.

Loan repayments are made through regular payroll deductions for a period of up to 60 months for general loans and over a longer period for loans used to finance the purchase of a principal residence. If a Member’s employment terminates for any reason, and the loan balances are not paid in full by the termination date, the

Member may continue to make monthly loan repayments until the loan is scheduled to be paid off. A loan will generally be subject to default if a payment has not been made for 90 days, an outstanding loan balance remains 30 days after the scheduled payoff date, or the Member takes a full distribution of his or her net account balance before the loan is paid off. If the loan defaults, the loan balance will become taxable income to the Member.

Benefit Payments — Upon termination of service, a Member may elect to receive a lump-sum amount equal to the full value of the Member’s vested interest in his or her account; a partial payment amount; or monthly, quarterly, semiannual, or annual installments of a fixed dollar amount or for a specific number of years, up to 10 years. Generally, a Member may also elect to have all or a portion of his or her Boeing Stock Fund balance paid in shares and/or cash. A Member also has the option to elect to apply all or a part of his or her account toward the purchase of an annuity contract with payments for a specified number of years, from a provider made available by the Plan administrator in accordance with the procedures established by the Plan administrator. If a Member makes no election, annual distributions of the required minimum amount will generally begin after age 73, in accordance with applicable Plan provisions. Notwithstanding the foregoing, following a Member’s termination of service, if his or her account balance is one thousand dollars or less, it will automatically be paid out to the Member in accordance with applicable Plan provisions.

Plan Amendments — Effective January 1, 2025, as specified in the Plan provisions, the Plan document was amended to update the list of eligible incentive plans, include a separate catch-up contribution election for all Members who are catch-up eligible, and reflect mandatory Roth catch-up contributions for certain Members who are catch-up eligible.