Horizon Quantum Holdings Ltd.

FY: Dec 31 2025

FY: Mar 19 2026

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Notice of Effectiveness

No description available

Registration statement for securities of certain foreign private issuers

Post-effective amendment to a registration statement

Registration of Securities on Exchange

Certification of approval for listing and registration on a national securities exchange

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Chew Qian Yi Amanda

Gould Greg

Fitzsimons Joseph Francis

Tan Si-Hui

Fitzsimons Catherine Michele

Tencent Holdings Ltd

Chew Qian Yi Amanda

Peak XV Partners Seed Investment

ICS OPPORTUNITIES, LTD.

Fitzsimons Catherine Michele

Turner Jill Ann

IonQ, Inc.

Fitzsimons Joseph Francis

Gould Greg

Tencent Holdings Ltd

Tan Si-Hui

Lambert Danielle

Fitzsimons Joseph Francis

You Harry L.

You Harry L.

Correspondence with the SEC

Letter from the SEC

Draft registration statement (confidential submission)