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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE\nISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2026

Commission File Number: 001-40777

ARQIT QUANTUM INC.

(Exact name of registrant as specified in its\ncharter)

2^nd Floor, 3 Orchard Place

London, SW1H 0BF United Kingdom

(Address of principal executive office)

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

Form 20-F x  Form\n40-F ¨

EXPLANATORY NOTE

On October 8, 2026 Arqit\nQuantum Inc. (the “Company”) issued a press release entitled “Announces Select Preliminary Financial Results\nfor the Second Half and Full Fiscal Year 2026,” in which the Company reported select unaudited preliminary financial results for\nthe six months and year ended September 30, 2026. A copy of that press release is furnished as Exhibit 99.1 hereto.

The\ninformation furnished in this Report of Foreign Private Issuer on Form 6-K, including the information contained in Exhibit 99.1, shall\nnot be deemed to be “filed” for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of\nthat section, and shall not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or\nthe Exchange Act, except as shall be expressly set forth by a specific reference in such filing.

EXHIBIT INDEX

\n \n \n \n \n \n \n \n \n

Exhibit No.		Description
99.1		Press release of Arqit Quantum Inc., dated October 8, 2026.

SIGNATURES

Pursuant to the requirements\nof the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto\nduly authorized.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

ARQIT QUANTUM INC.

By:	/s/ Andrew Leaver
Name:	Andrew Leaver
Title:	Chief Executive Officer

Date: October 8, 2026

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