Company: BA
Filing Date: 2025-03-07
Form Type: DEFA14A
Source: 0001193125-25-049929
Chunk: 0

Company: BOEING CO
Filing Date: 2025-03-07
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material Pursuant to §240.14a-12 |

THE BOEING COMPANY (Name of registrant as specified in its charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check the appropriate box):

| ☒ | No fee required |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

Important Notice Regarding the Availability of Proxy Materials for Boeing’s Annual Meeting of Shareholders to be held on April 24, 2025 This notice has been sent on behalf of The Boeing Company and provides voting instructions and deadlines relating to shares of Boeing stock that are registered in your name as well as interests in Boeing stock held through your participation in The Boeing Company 401(k) Plan. The items of business and the recommendations of the Board of Directors are described in the 2025 Proxy Statement, which we encourage you to read before voting. Your vote is important. Click here to vote now. Your 16-DigitVoting Control Number 0123456789012345 How to Vote

|                                                                                                                                                                                         | VIA THE INTERNET |
| Go to www.proxyvote.com. Enter your unique 16-digit control number and four-digit PIN, which is the last four digits of your Social Security Number (unless you previously changed your 
 PIN). Follow the instructions on the screen.                                                                                                                                            |                  |
|                                                                                                                                                                                         | BY TELEPHONE     |
| Call 1-800-690-6903. Have your unique 16-digit control number and                                                                                                                       
 four-digit PIN, which is the last four digits of your Social Security Number (unless you previously changed your PIN) available when you call. Follow