AMS American Shared Hospital Services
American Shared Hospital Services (AMS) Institutional Ownership
What the institutions did with AMS 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 |
|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | 102.1K | 20.2% |
| LPL Financial LLC | 81.4K | 16.1% |
| RENAISSANCE TECHNOLOGIES LLC | 57.7K | 11.4% |
| VANGUARD CAPITAL MANAGEMENT LLC | 55.7K | 11.0% |
| JAMES INVESTMENT RESEARCH, INC. | 29.7K | 5.9% |
| NewEdge Advisors, LLC | 29.7K | 5.9% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 29.1K | 5.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 26.5K | 5.2% |
| VANGUARD FIDUCIARY TRUST CO | 25.4K | 5.0% |
| XTX Topco Ltd | 19.1K | 3.8% |
| UBS Group AG | 18.4K | 3.6% |
| STATE STREET CORP | 12.1K | 2.4% |
| Empowered Funds, LLC | 11.9K | 2.4% |
| MORGAN STANLEY | 5.9K | 1.2% |
| CITIGROUP INC | 454 | 0.1% |
| Caitong International Asset Management Co., Ltd | 107 | 0.0% |
| JONES FINANCIAL COMPANIES LLLP | 100 | 0.0% |
| BARCLAYS PLC | 82 | 0.0% |
| ROYAL BANK OF CANADA | 69 | 0.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Corient Private Wealth LP | Sold Out | 160.6K | 0 | -160.6K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 205.1K | 102.1K | -103.0K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 153.7K | 55.7K | -98.1K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | Reduced | 90.8K | 29.1K | -61.7K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Sold Out | 42.3K | 0 | -42.3K |
| DRW Securities, LLC | Sold Out | 32.9K | 0 | -32.9K |
| CITADEL ADVISORS LLC | Sold Out | 28.6K | 0 | -28.6K |
| XTX Topco Ltd | New | 0 | 19.1K | +19.1K |
| UBS Group AG | Increased | 200 | 18.4K | +18.2K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 49.2K | 57.7K | +8.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 32.6K | 26.5K | -6.1K |
| LPL Financial LLC | Increased | 76.4K | 81.4K | +5.0K |
| Tower Research Capital LLC (TRC) | Sold Out | 2.8K | 0 | -2.8K |
| VANGUARD FIDUCIARY TRUST CO | Reduced | 27.4K | 25.4K | -2.0K |
| CITIGROUP INC | New | 0 | 454 | +454 |
| Caitong International Asset Management Co., Ltd | New | 0 | 107 | +107 |
| BARCLAYS PLC | New | 0 | 82 | +82 |
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.