SeaStar Medical Holding Corp
ICU- Exchange
- Nasdaq
- Industry
- Surgical & Medical Instruments & Apparatus
- SEC CIK
- 0001831868
In the last 90 days, SeaStar Medical Holding Corp insiders filed 1 open-market purchase and 0 sales; 18 institutions reported holding it in 13F filings for Q2 2026, worth $582.1K in total; no superinvestor holds it.
Other share classesICUCW
Holders of 5% or more of ICU
Holders whose latest Schedule 13D or 13G filing reports 5% or more of SeaStar Medical Holding Corp, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Intracoastal Capital, LLC | 13G/A | 9.99%3.98M shares | 0.00 ppfrom 9.99% | Jun 27, 20253 filings | Feb 13, 2026 | SEC |
| Intracoastal Capital, LLC | 13G/A | 9.99%443.3K shares | – | May 13, 20261 filing | May 13, 2026 | SEC |
| Ayrton Capital LLC | 13G | 6.52%278.4K shares | +3.92 ppfrom 2.60% | Feb 13, 20253 filings | May 11, 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
23 Schedule 13D and 13G filings on SeaStar Medical Holding Corp, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| May 13, 20264:21 PM ET | Intracoastal Capital, LLCand 2 others | 13G/A | 9.99%443.3K shares | – | Mar 31, 2026 | SEC |
| May 11, 20265:52 PM ET | Ayrton Capital LLCand 2 others | 13G | 6.52%278.4K shares | +3.92 ppfrom 2.60% | Mar 31, 2026 | SEC |
| Feb 13, 20264:43 PM ET | Intracoastal Capital, LLCand 2 others | 13G/A | 9.99%3.98M shares | 0.00 ppfrom 9.99% | Dec 31, 2025 | SEC |
| Nov 7, 20255:25 PM ET | Intracoastal Capital, LLCand 2 others | 13G/A | 9.99%3.10M shares | 0.00 ppfrom 9.99% | Sep 30, 2025 | SEC |
| Aug 14, 20259:09 PM ET | Armistice Capital, LLCand 1 other | 13G/A | 4.99%1.47M shares | −5.00 ppfrom 9.99%Below 5% | Jun 30, 2025 | SEC |
| Aug 13, 20256:39 AM ET | Ayrton Capital LLCand 2 others | 13G/A | 2.60%294.4K shares | −3.60 ppfrom 6.20%Below 5% | Jun 30, 2025 | SEC |
| Jun 27, 20255:08 PM ET | Intracoastal Capital, LLCand 2 others | 13G | 9.99%1.80M shares | New | Jun 20, 2025 | SEC |
| May 15, 20253:16 PM ET | Armistice Capital, LLCand 1 other | 13G | 9.99%1.02M shares | New | Mar 31, 2025 | SEC |
| Feb 13, 20251:33 PM ET | Ayrton Capital LLCand 2 others | 13G/A | 6.20%294.4K shares | – | Dec 31, 2024 | SEC |
| Feb 14, 2023 | Vellar Opportunities Fund Master, Ltd. | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2023 | Hudson Bay Capital Management LP | 13G/AOld format | – | – | – | SEC |
| Nov 10, 2022 | Karpus Management, Inc. | 13G/AOld format | – | – | – | SEC |
| Nov 7, 2022 | LMFAO Sponsor, LLC | 13DOld format | – | New | – | SEC |
| Nov 4, 2022 | Union Carbide Employees' Pension Plan Trust | 13GOld format | – | New | – | SEC |
| Nov 4, 2022 | Dow Employees' Pension Plan Trust | 13GOld format | – | New | – | SEC |
| Nov 3, 2022 | Vellar Opportunities Fund Master, Ltd. | 13GOld format | – | New | – | SEC |
| Feb 14, 2022 | Karpus Management, Inc. | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2022 | Saba Capital Management, L.P. | 13G/AOld format | – | – | – | SEC |
| Feb 8, 2022 | Hudson Bay Capital Management LP | 13GOld format | – | New | – | SEC |
| Feb 2, 2022 | Space Summit Capital LLC | 13G/AOld format | – | – | – | SEC |
| Jun 10, 2021 | Karpus Management, Inc. | 13GOld format | – | New | – | SEC |
| Apr 1, 2021 | Saba Capital Management, L.P. | 13GOld format | – | New | – | SEC |
| Mar 8, 2021 | Space Summit Capital LLC | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell SeaStar Medical Holding Corp shares.
No Form 144 notices for SeaStar Medical Holding Corp are on file.