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Horizon Quantum Holdings Ltd.

For the period ended May 4, 2026. Filed May 4, 2026.

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May 4, 2026 · Filed May 4, 2026

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6-K 1 ea0288728-6k_horizon.htm REPORT OF FOREIGN PRIVATE ISSUER

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16

OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of May 2026

Commission File Number: 001-43203

Horizon Quantum Holdings Ltd.

(Exact name of registrant as specified in its charter)

29 Media Cir., #05-22

Singapore, 138565

(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 ☒ Form 40-F ☐

On April 29, 2026, Mr. Peter Oey was appointed to the Board of Directors (the “Board”) of Horizon Quantum Holdings Ltd. (the “Company”). Mr. Oey will serve as chairman of the

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