AMS: AMERICAN SHARED HOSPITAL SERVICES insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-07-30 | 13D amendment | Stachowiak Raymond C | 35.30% | SEC |
Institutional ownership (Q2 2026)
20 institutions reported holding $799K of AMERICAN SHARED HOSPITAL SERVICES on Form 13F (21 the quarter before). 4 opened a new position and 5 sold out. Shares held by institutions: -49%.
| Largest holders | Shares | Value |
|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | 102,140 | $161K |
| LPL Financial LLC | 81,386 | $129K |
| RENAISSANCE TECHNOLOGIES LLC | 57,695 | $91K |
| VANGUARD CAPITAL MANAGEMENT LLC | 55,662 | $88K |
| NewEdge Advisors, LLC | 29,725 | $47K |
| JAMES INVESTMENT RESEARCH, INC. | 29,725 | $47K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 29,124 | $46K |
| GEODE CAPITAL MANAGEMENT, LLC | 26,497 | $42K |
| VANGUARD FIDUCIARY TRUST CO | 25,363 | $40K |
| XTX Topco Ltd | 19,107 | $30K |
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