UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO SECTION 13A-16 OR 15D-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December 2025

Commission File Number: 001-41169

Vertical Aerospace Ltd.

(Exact Name of Registrant as Specified in Its Charter)

Unit 1 Camwal Court, Chapel Street

Bristol BS2 0UW

United Kingdom

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

Long-Term Supplier Partnership with Syensqo

Vertical Aerospace Ltd. (the “Company”), through its wholly owned subsidiary, Vertical Aerospace Group Limited, and Cytec Engineered Materials Inc. (“Syensqo”), a gobal leader in advanced materials, entered into a long-term supply partnership, pursuant to which Syensqo’s composite and adhesive materials will be integrated across the entire structure of the Company’s electric and hybrid-electric vertical take-off and landing (“eVTOL”) aircraft, the VX4. The Company and Syensqo have entered into a Long-Term Development and Supply Agreement, which will become irrevocable on December 26, 2025.

Under the partnership agreement, Syensqo will supply the composite and adhesive materials for use across the entire VX4 structure including the wing, empennage, pylons and fuselage, of both the pre-production and, subject to certification, certified VX4 that will enter into service. The VX4’s airframe itself will be manfuactured by Aciturri, a leading global aerostructures supplier.

Press Release

On December 8, 2025, the Company issued a press release in relation to the Company’s partnership with Syensqo, a copy of which is furnished as Exhibit 99.1 hereto.

Forward-Looking Statements

This Report of Foreign Private Issuer on Form 6-K (the “Form 6-K”) contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Any express or implied statements contained in this Form 6-K that are not statements of historical fact may be deemed to be forward-looking statements, including, without limitation, statements regarding a partnership with Syensqo for advanced composites and adhesive materials, including Syensqo’s supply and obligations under the partnership agreement, the efficiencies, reliability and expertise expected, the design and manufacture of the VX4 and the hybrid-electric variant, certification and the commercialization of the VX4 and our ability to achieve regulatory certification of our aircraft product on any particular timeline or at all, the features and capabilities of the VX4, business strategy and plans and objectives of management for future operations, including the building and testing of our prototype aircrafts on timelines projected, completion of the piloted test programme phases, selection of suppliers, as well as statements that include the words “expect,” “intend,” “plan,” “believe,” “project,” “forecast,” “estimate,” “may,” “should,” “anticipate,” “will,” “aim,” “potential,” “continue,” “is/are likely to” and similar statements of a future or forward-looking nature. These forward-looking statements reflect our current views with respect to future events and are not a guarantee of future performance. Actual outcomes may differ materially from the information contained in the forward-looking statements as a result of a number of factors, including, without limitation, the important factors discussed under the caption “Risk Factors” in the Company's Annual Report on Form 20-F filed with the U.S. Securities and Exchange Commission (“SEC”) on March 11, 2025, as such factors may be updated from time to time in the Company’s other filings with the SEC. Any forward-looking statements contained in this Form 6-K speak only as of the date hereof and accordingly undue reliance should not be placed on such statements. the Company disclaims any obligation or undertaking to update or revise any forward-looking statements contained in this Form 6-K, whether as a result of new information, future events or otherwise, other than to the extent required by applicable law.

INCORPORATION BY REFERENCE

The information included in this Report on Form 6-K (excluding Exhibit 99.1) is hereby incorporated by reference into the Company’s Registration Statements on Form F-3 (File No. 333-270756, File No. 333-284763 and File No. 333-287207) (including any prospectuses forming a part of such registration statements) and to be a part thereof from the date on which this Report on Form 6-K is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

EXHIBIT INDEX

Exhibit

No.

Description

99.1

Press release of Vertical Aerospace Ltd. dated December 8, 2025

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	Vertical Aerospace Ltd.

Date: December 8, 2025	By:	/s/ Stuart Simpson
		Stuart Simpson
		Chief Executive Officer

Vertical Aerospace Ltd. 6-K