AMS — AMERICAN SHARED HOSPITAL SERVICES
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2016-01-04.
Performance
Technicals
Others in Healthcare
Measured signals that fired on AMS
| date | signal | measured base rate |
|---|---|---|
| 2026-07-20 | Short volume far above its own normal short | -0.76% over 21 days · t = -2.79 · n = 5,897 statistically distinguishable from its control group |
| 2026-06-24 | Conviction buy by an officer insider | -1.03% over 21 days · t = -2.24 · n = 1,083 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-06-22 | Stachowiak Raymond C Executive Chairman | Open-market purchase | 586.5K | 2.28 | 1.3M |
| 2026-03-26 | Stachowiak Raymond C Executive Chairman | Grant or award | 100.0K | 0.00 | 0 |
| 2025-06-26 | Stachowiak Raymond C Executive Chairman | Grant or award | 110.0K | 0.00 | 0 |
| 2025-04-30 | Tagawa Craig Kenji President | Grant or award | 5.6K | 0.00 | 0 |
| 2024-12-19 | Frech Raymond Scott Chief Financial Officer | Grant or award | 50.0K | 0.00 | 0 |
| 2024-10-14 | Delanois Gary Chief Operating Officer | Grant or award | 120.0K | 0.00 | 0 |
| 2024-03-22 | Stachowiak Raymond C Executive Chairman | Grant or award | 120.0K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | 297.4K | 205.1K |
| Corient Private Wealth LLC | 232.8K | 160.6K |
| VANGUARD CAPITAL MANAGEMENT LLC | 222.9K | 153.7K |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 131.7K | 90.8K |
| LPL Financial LLC | 110.7K | 76.4K |
| RENAISSANCE TECHNOLOGIES LLC | 71.3K | 49.2K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 61.4K | 42.3K |
| DRW Securities, LLC | 47.7K | 32.9K |
| GEODE CAPITAL MANAGEMENT, LLC | 47.3K | 32.6K |
| JAMES INVESTMENT RESEARCH, INC. | 43.1K | 29.7K |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
Recent headlines
- American Shared Hospital Services (AMS) filed form 8-K · 2026-08-13 · SEC EDGAR
Ask the AI about AMS
The assistant reads every block on this page — price history, filings, insider transactions, institutional positions, short volume, macro and the measured base rates — and says what it implies, quoting the number behind each claim and declaring what it does not have.
Everything on this page is live in the terminal.
Charts, filings, insider flow and the AI — open without an account.
Free plan for good. Pro is $69.99/mo, or $4.99 for a 7-day trial. See the plans →