Company: BA
Filing Date: 2025-03-07
Form Type: DEFA14A
Source: 0001193125-25-049929
Chunk: 2

Company: BOEING CO
Filing Date: 2025-03-07
Form: DEFA14A
Chunk 2
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P.O. Box 1310, Brentwood, NY 11717

2

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 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 the recorded instructions.        |                  |

Voting Deadline: Wednesday, April 16, 2025 at 11:59 p.m., Eastern Time 1

Annual Meeting

The Boeing Company 2025 Annual Meeting of Shareholders will be held in a virtual format only by webcast on Thursday, April 24, 2025 at 9:00 a.m., Eastern
Time at