Horizon Space Acquisition I Corp.
HSPOF- Exchange
- OTC
- Industry
- Blank Checks
- SEC CIK
- 0001946021
No open-market purchases or sales by Horizon Space Acquisition I Corp. insiders were filed in the last 90 days; no institution reported holding it in 13F filings for Q2 2026; no superinvestor holds it.
Holders of 5% or more of HSPOF
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Horizon Space Acquisition I Corp., largest stake first. The change is against the holder's previous filing.
No holder currently reports owning 5% or more of Horizon Space Acquisition I Corp. on Schedule 13D or 13G.
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
14 Schedule 13D and 13G filings on Horizon Space Acquisition I Corp., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 13, 20264:11 PM ET | Vivaldi Asset Management, LLCand 3 others | 13G/A | 0.00%0 shares | −7.20 ppfrom 7.20%Below 5% | Dec 31, 2025 | SEC |
| Feb 13, 20264:02 PM ET | Westchester Capital Management, LLCand 2 others | 13G/A | 0.00%0 shares | −7.12 ppfrom 7.12%Below 5% | Dec 31, 2025 | SEC |
| Feb 12, 20267:07 AM ET | Mizuho Financial Group Inc | 13G/A | 0.00%0 shares | −9.00 ppfrom 9.00%Below 5% | Dec 31, 2025 | SEC |
| Oct 31, 20256:01 AM ET | Wolverine Asset Management LLCand 4 others | 13G/A | 0.00%0 shares | −9.56 ppfrom 9.56%Below 5% | Oct 29, 2025 | SEC |
| Aug 13, 20256:10 AM ET | Mizuho Financial Group Inc | 13G/A | 9.00%375.2K shares | 0.00 ppfrom 9.00% | Jun 30, 2025 | SEC |
| May 15, 20257:09 PM ET | Vivaldi Asset Management, LLCand 3 others | 13G/A | 7.20%300.0K shares | +3.37 ppfrom 3.83% | Mar 31, 2025 | SEC |
| May 13, 20256:28 AM ET | Mizuho Financial Group Inc | 13G/A | 9.00%375.2K shares | +3.90 ppfrom 5.10% | Mar 31, 2025 | SEC |
| Mar 5, 20254:04 PM ET | TD Securities (USA) LLCand 4 others | 13G/A | 0.00%0 shares | −5.50 ppfrom 5.50%Below 5% | Dec 31, 2024 | SEC |
| Feb 14, 20255:40 PM ET | Vivaldi Asset Management, LLCand 3 others | 13G/A | 3.83%300.0K shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 14, 20253:45 PM ET | TD Securities (USA) LLCand 4 others | 13G | 5.50%433.8K shares | New | Dec 31, 2024 | SEC |
| Feb 14, 20256:01 AM ET | Westchester Capital Management, LLCand 2 others | 13G | 7.12%297.0K shares | New | Dec 31, 2024 | SEC |
| Feb 13, 202511:05 AM ET | Mizuho Financial Group Inc | 13G/A | 5.10%399.5K shares | – | Dec 31, 2024 | SEC |
| Jan 31, 20259:15 AM ET | Wolverine Asset Management LLCand 4 others | 13G/A | 9.56%398.7K shares | – | Dec 31, 2024 | SEC |
| Jan 7, 20254:03 PM ET | Karpus Management, Inc. | 13G/A | 1.28%100.0K shares | –Below 5% | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Horizon Space Acquisition I Corp. shares.
No Form 144 notices for Horizon Space Acquisition I Corp. are on file.