Quartzsea Acquisition Corp
QSEA- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002047455
No open-market purchases or sales by Quartzsea Acquisition Corp insiders were filed in the last 90 days; 21 institutions reported holding it in 13F filings for Q2 2026, worth $70.9M in total; no superinvestor holds it.
Holders of 5% or more of QSEA
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Quartzsea Acquisition Corp, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Blue Jay Investment LLC | 13D | 27.43%3.13M shares | New | Apr 3, 20251 filing | Apr 3, 2025 | SEC |
| Karpus Management, Inc. | 13G/A | 8.54%974.8K shares | −12.22 ppfrom 20.76% | Jun 6, 20252 filings | Jun 5, 2026 | SEC |
| Feis Equities LLC | 13G/A | 5.26%600.1K shares | +1.01 ppfrom 4.25% | Mar 25, 20253 filings | Jun 8, 2026 | SEC |
| Wolverine Asset Management LLC | 13G | 5.12%584.5K shares | New | Oct 10, 20251 filing | Oct 10, 2025 | 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
6 Schedule 13D and 13G filings on Quartzsea Acquisition Corp, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jun 8, 202611:50 AM ET | Feis Equities LLCand 1 other | 13G/A | 5.26%600.1K shares | +1.01 ppfrom 4.25% | Jun 1, 2026 | SEC |
| Jun 5, 20264:03 PM ET | Karpus Management, Inc. | 13G/A | 8.54%974.8K shares | −12.22 ppfrom 20.76% | May 29, 2026 | SEC |
| Oct 10, 20251:46 PM ET | Wolverine Asset Management LLCand 4 others | 13G | 5.12%584.5K shares | New | Sep 30, 2025 | SEC |
| Jun 6, 20254:07 PM ET | Karpus Management, Inc. | 13G | 20.76%2.37M shares | New | May 30, 2025 | SEC |
| May 27, 20259:59 PM ET | Feis Equities LLCand 1 other | 13G/A | 4.25%485.0K shares | −5.59 ppfrom 9.84%Below 5% | May 22, 2025 | SEC |
| Apr 3, 20256:02 PM ET | Blue Jay Investment LLC | 13D | 27.43%3.13M shares | New | Mar 19, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Quartzsea Acquisition Corp shares.
No Form 144 notices for Quartzsea Acquisition Corp are on file.