Horizon Quantum Holdings Ltd.
HQ- Exchange
- Nasdaq
- Industry
- Services-Computer Programming Services
- SEC CIK
- 0002088256
No open-market purchases or sales by Horizon Quantum Holdings Ltd. insiders were filed in the last 90 days; 34 institutions reported holding it in 13F filings for Q2 2026, worth $533.3M in total; no superinvestor holds it.
Other share classesHQWWW
Holders of 5% or more of HQ
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Horizon Quantum Holdings Ltd., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Fitzsimons Joseph Francis | 13D | 38.30%19.7M shares | New | Mar 31, 20261 filing | Mar 31, 2026 | SEC |
| Peak XV Partners Seed Investment | 13D | 20.30%6.47M shares | New | Jul 9, 20261 filing | Jul 9, 2026 | SEC |
| IonQ, Inc. | 13D | 13.30%4.23M shares | New | Apr 1, 20261 filing | Apr 1, 2026 | SEC |
| You Harry L. | 13D | 11.80%4.10M shares | New | Mar 20, 20261 filing | Mar 20, 2026 | SEC |
| Tencent Holdings Ltd | 13G/A | 11.10%3.80M shares | −2.00 ppfrom 13.10% | Mar 25, 20262 filings | Aug 14, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
7 Schedule 13D and 13G filings on Horizon Quantum Holdings Ltd., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 14, 20266:25 AM ET | Tencent Holdings Ltdand 1 other | 13G/A | 11.10%3.80M shares | −2.00 ppfrom 13.10% | Jun 30, 2026 | SEC |
| Jul 9, 20265:17 PM ET | Peak XV Partners Seed Investmentand 3 others | 13D | 20.30%6.47M shares | New | Mar 19, 2026 | SEC |
| Jun 25, 20267:13 PM ET | Ics Opportunities, Ltd.and 3 others | 13G | 0.10%20.6K shares | NewBelow 5% | Jun 17, 2026 | SEC |
| Apr 1, 20269:34 PM ET | IonQ, Inc. | 13D | 13.30%4.23M shares | New | Mar 19, 2026 | SEC |
| Mar 31, 20268:22 AM ET | Fitzsimons Joseph Francis | 13D | 38.30%19.7M shares | New | Mar 19, 2026 | SEC |
| Mar 25, 20266:19 AM ET | Tencent Holdings Ltdand 1 other | 13G | 13.10%4.18M shares | New | Mar 19, 2026 | SEC |
| Mar 20, 20264:40 PM ET | You Harry L.and 1 other | 13D | 11.80%4.10M shares | New | Mar 19, 2026 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Horizon Quantum Holdings Ltd. shares.
No Form 144 notices for Horizon Quantum Holdings Ltd. are on file.