Company: SPR
Filing Date: 2025-01-17
Form Type: 425
Source: 0001104659-25-004487
Chunk: 0

Company: Spirit AeroSystems Holdings, Inc.
Filing Date: 2025-01-17
Form: 425
Chunk 0
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<div align='center'>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):
January 17, 2025

Spirit AeroSystems Holdings, Inc.

(Exact name of registrant as specified in
its charter)</div>

| Delaware                     |     | 001-33160   |     | 20-2436320         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

<div align='center'>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.)</div>

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:

| x | Written communications pursuant to Rule 425 under 
 the Securities Act (17 CFR 230.425)               |

| ¨ | Soliciting material pursuant to Rule 14a-12 under 
 the Exchange Act (17 CFR 240.14a-12)              |

| ¨ | Pre-commencement communications pursuant to Rule 14d-2(b) under 
 the Exchange Act (17 CFR 240.14d-2(b))                          |

| ¨ | Pre-commencement communications pursuant to Rule 13e-4(c) under 
 the Exchange Act (17 CFR 240.13e-4(c))                          |

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

| Title of each                                   
 class:                                          |     | Trading   
 symbol(s) |     | Name of exchange on which registered |
| Class A Common Stock, par value $0.01 per share |     | SPR       |     | New York Stock Exchange              |

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 (§