Institutional Ownership
American Shared Hospital Svc
CUSIP 029595105COMAMSQ1 2026
13D / 13G Filings
10
Schedule 13D/13G on record
Beneficial Filers
5
Distinct reporting persons
Largest Stake
23.7%
Max % of class reported
Institutional Holders
18
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
10 filings · latest Dec 16, 2025
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Dec 16, 2025 | Ruffle John F | 13D/A | — | — | SEC |
| 2 | Dec 9, 2025 | Stachowiak Raymond C | 13D/A | 23.7% | — | SEC |
| 3 | May 9, 2025 | Anita G. Zucker | 13D/A | 9.1% | — | SEC |
| 4 | Mar 7, 2025 | Anita G. Zucker | 13D/A | 7.9% | — | SEC |
| 5 | Jan 3, 2025 | Stachowiak Raymond C | 13D/A | 22.8% | — | SEC |
| 6 | Nov 20, 2024 | Zucker Anita G | 13D | 5.2% | 331.2K | SEC |
| 7 | Apr 3, 2024 | Stachowiak Raymond C | 13D/A | 21.9% | 1.39M | SEC |
| 8 | Dec 18, 2023 | Ruffle John F | 13D/A | 6.5% | 410.7K | SEC |
| 9 | May 3, 2023 | Stachowiak Raymond C | 13D/A | 20.6% | 1.30M | SEC |
| 10 | Jun 14, 2021 | American Shared Hospital Services | 13D/A | 18.4% | 1.07M | SEC |
Top Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Dimensional Fund Advisors LP | 205.1K | $297.4K |
| 2 | Corient Private Wealth LLC | 160.6K | $232.8K |
| 3 | Bridgeway Capital Management, LLC | 90.8K | $131.7K |
| 4 | Lpl Financial LLC | 76.4K | $110.7K |
| 5 | Renaissance Technologies LLC | 49.2K | $71.3K |
| 6 | Susquehanna International Group, LLP | 42.3K | $61.4K |
| 7 | Drw Securities, LLC | 32.9K | $47.7K |
| 8 | Geode Capital Management, LLC | 32.6K | $47.3K |
| 9 | James Investment Research, Inc. | 29.7K | $43.1K |
| 10 | Citadel Advisors LLC | 28.6K | $41.4K |