ICU SeaStar Medical Holding Corporation
SeaStar Medical Holding Corporation (ICU) Institutional Ownership
What the institutions did with ICU last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BOOTHBAY FUND MANAGEMENT, LLC | 245.2K | 18.8% |
| Linden Advisors LP | 218.1K | 16.8% |
| GOLDMAN SACHS GROUP INC | 211.4K | 16.2% |
| LMR Partners LLP | 125.0K | 9.6% |
| SkyView Investment Advisors, LLC | 64.7K | 5.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 49.6K | 3.8% |
| Clear Street Group Inc. | 46.7K | 3.6% |
| Virtu Financial LLC | 40.3K | 3.1% |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 40.0K | 3.1% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 36.2K | 2.8% |
| EQUITEC PROPRIETARY MARKETS, LLC | 35.7K | 2.7% |
| VANGUARD CAPITAL MANAGEMENT LLC | 33.1K | 2.5% |
| Cruiser Capital Advisors, LLC | 32.5K | 2.5% |
| UBS Group AG | 32.2K | 2.5% |
| TWO SIGMA SECURITIES, LLC | 24.3K | 1.9% |
| VANGUARD FIDUCIARY TRUST CO | 13.7K | 1.1% |
| JANE STREET GROUP, LLC | 12.6K | 1.0% |
| StoneX Group Inc. | 11.1K | 0.9% |
| WOLVERINE ASSET MANAGEMENT LLC | 11.1K | 0.9% |
| NORTHERN TRUST CORP | 10.4K | 0.8% |
| PNC FINANCIAL SERVICES GROUP, INC. | 4.9K | 0.4% |
| Tower Research Capital LLC (TRC) | 1.4K | 0.1% |
| BlackRock, Inc. | 913 | 0.1% |
| OSAIC HOLDINGS, INC. | 195 | 0.0% |
| NewEdge Advisors, LLC | 176 | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| BOOTHBAY FUND MANAGEMENT, LLC | New | 0 | 245.2K | +245.2K |
| Linden Advisors LP | New | 0 | 218.1K | +218.1K |
| GOLDMAN SACHS GROUP INC | New | 0 | 211.4K | +211.4K |
| LMR Partners LLP | New | 0 | 125.0K | +125.0K |
| SkyView Investment Advisors, LLC | New | 0 | 64.7K | +64.7K |
| Clear Street Group Inc. | New | 0 | 46.7K | +46.7K |
| Virtu Financial LLC | New | 0 | 40.3K | +40.3K |
| TENOR CAPITAL MANAGEMENT Co., L.P. | New | 0 | 40.0K | +40.0K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | 0 | 36.2K | +36.2K |
| EQUITEC PROPRIETARY MARKETS, LLC | New | 0 | 35.7K | +35.7K |
| Cruiser Capital Advisors, LLC | New | 0 | 32.5K | +32.5K |
| UBS Group AG | Increased | 793 | 32.2K | +31.4K |
| TWO SIGMA SECURITIES, LLC | New | 0 | 24.3K | +24.3K |
| JANE STREET GROUP, LLC | Reduced | 28.0K | 12.6K | -15.3K |
| StoneX Group Inc. | New | 0 | 11.1K | +11.1K |
| WOLVERINE ASSET MANAGEMENT LLC | New | 0 | 11.1K | +11.1K |
| NORTHERN TRUST CORP | New | 0 | 10.4K | +10.4K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 55.6K | 49.6K | -6.0K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 28.8K | 33.1K | +4.3K |
| PNC FINANCIAL SERVICES GROUP, INC. | Increased | 1.7K | 4.9K | +3.2K |
| Tower Research Capital LLC (TRC) | Reduced | 1.4K | 1.4K | -39 |
| OSAIC HOLDINGS, INC. | Reduced | 230 | 195 | -35 |
| MORGAN STANLEY | Sold Out | 20 | 0 | -20 |
| BARCLAYS PLC | New | 0 | 4 | +4 |
| Caitong International Asset Management Co., Ltd | New | 0 | 2 | +2 |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.