Delisting riskPopularity #4,597
SeaStar Medical (ICU)
Builds extracorporeal immunomodulation cartridges for acute kidney injury care.
$3.47
vs last close−0.06 (−1.70%)
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13F · 13D/G · Form 4
| Institutions | 3.60% | 158.6K shares | |
|---|---|---|---|
| 19 holders · as of Jun 30, 2026 | |||
| Insiders | 13.16% | 579.9K shares | |
| 9 holders · as of Aug 19, 2026 | |||
| Other | 83.24% | 3.67M shares | |
| remainder | |||
4.41M company shares as of Sep 23, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
Two share counts disagree (4.41M in the company's Sep 23, 2026 report, 2.84M elsewhere); stakes use the report.
13F, as of Jun 30, 2026
19 holders · 158.6K shares · 4 new positions · 7 increased · 4 reduced · 2 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Geode Capital Management, LLC | 49.6K | 1.13% | −6.0K | Aug 12, 2026 |
| Vanguard Capital Management LLC | 33.1K | 0.75% | +4.3K | Aug 13, 2026 |
| UBS Group AG | 31.4K | 0.71% | +30.6K | Aug 13, 2026 |
| Vanguard Fiduciary Trust Co | 13.7K | 0.31% | 0 | Aug 13, 2026 |
| Jane Street Group, LLC | 12.6K | 0.29% | −15.3K | Aug 14, 2026 |
| Northern Trust Corp | 10.4K | 0.24% | +10.4Knew | Aug 13, 2026 |
| PNC Financial Services Group, Inc. | 4.9K | 0.11% | +3.2K | Aug 7, 2026 |
| Tower Research Capital LLC (TRC) | 1.4K | 0.03% | −39 | Aug 11, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Mitchell P. Kopin | 9.99% | 443.3K | 13G | May 13, 2026 |
| Opportunity Master Fund, SPC – Segregated Master Portfolio Bincl. Capital LLC, Khatri | 6.60% | 13G | Nov 14, 2024 | |
| Ayrton Capital LLC | 6.52% | 278.4K | 13G | May 11, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 18, 2026 | Michael Messingerofficer: Chief Financial Officer | Purchase | 750 | $3.27 | 2,500 |
| Dec 19, 2025 | Jennifer A. Bairddirector | Purchase | 4,200 | $0.2351 | 36,200 |
| Dec 9, 2025 | Michael Messingerofficer: Chief Financial Officer | Purchase | 14,500 | $0.3516 | 17,500 |
House and Senate disclosures
Not reported.