AMS
American Shared Hospital Services
$1.49
-0.02 (-1.32%)
At close · Jul 2
Market Cap
$9.87M
Shares
6,625,000
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 21
Total Value: $1,438,498
Total Shares: 992,073
Institutional Ownership Trend
25 quarters
Holder Concentration
Across 21 13F filers · Δ vs Dec 31, 2025Top Holder
20.7%
−2.7 pts
Top 5
69.2%
−9.3 pts
Top 10
88.0%
−9.6 pts
HHI
1,174
Broadly held−352
Quarterly Activity
vs Dec 31, 2025
New
6
Increased
3
Decreased
6
Sold Out
3
Unchanged
6
Holder count:
+3
Institutional value:
-22.7%
Shares held:
+12.4%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | +14,943 | 42,314 | |
| Mid Tower Research Capital LLC (TRC) | +876 | 2,814 | |
| Mega ROYAL BANK OF CANADA | +8 | 69 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid DRW Securities, LLC | −17,592 | 32,889 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | −3,300 | 90,820 | |
| Mega DIMENSIONAL FUND ADVISORS LP | −1,294 | 205,120 | |
| Mega MORGAN STANLEY | −450 | 5,858 | |
| Large RENAISSANCE TECHNOLOGIES LLC | −200 | 49,200 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 153,737 | $222,918 | |
| Mega LPL Financial LLC | 76,366 | $110,730 | |
| Mega CITADEL ADVISORS LLC | 28,558 | $41,409 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 27,406 | $39,738 | |
| Large Empowered Funds, LLC | 11,924 | $17,289 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 181,143 | $382,211 | |
| Mega CITIGROUP INC | 142 | $299 | |
| Mega BANK OF AMERICA CORP /DE/ | 60 | $126 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega DIMENSIONAL FUND ADVISORS LP | $297,423 | 20.68% | 205,120 | Shares | Sole | 2026-05-07 | ||||
| Large Corient Private Wealth LLC | $232,810 | 16.18% | 160,559 | Shares | Sole | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $222,918 | 15.50% | 153,737 | Shares | Defined | 2026-05-15 | ||||
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $131,689 | 9.15% | 90,820 | Shares | Sole | 2026-05-15 | ||||
| Mega LPL Financial LLC | $110,730 | 7.70% | 76,366 | Shares | Sole | 2026-05-06 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $71,340 | 4.96% | 49,200 | Shares | Sole | 2026-05-14 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $61,355 | 4.27% | 42,314 | Shares | Other | 2026-05-15 | ||||
| Mid DRW Securities, LLC Broker-Dealer | $47,689 | 3.32% | 32,889 | Shares | Other | 2026-05-13 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $47,251 | 3.28% | 32,588 | Shares | Defined | 2026-05-15 | ||||
| Small JAMES INVESTMENT RESEARCH, INC. | $43,101 | 3.00% | 29,725 | Shares | Sole | 2026-04-24 | ||||
| Large NewEdge Advisors, LLC | $43,101 | 3.00% | 29,725 | Shares | Sole | 2026-05-18 | ||||
| Mega CITADEL ADVISORS LLC | $41,409 | 2.88% | 28,558 | Shares | Defined | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $39,738 | 2.76% | 27,406 | Shares | Defined | 2026-05-08 | ||||
| Mega STATE STREET CORP | $17,546 | 1.22% | 12,101 | Shares | Defined | 2026-05-15 | ||||
| Large Empowered Funds, LLC | $17,289 | 1.20% | 11,924 | Shares | Other | 2026-05-15 | ||||
| Mega MORGAN STANLEY | $8,494 | 0.59% | 5,858 | Shares | Defined | 2026-05-15 | ||||
| Mid Tower Research Capital LLC (TRC) | $4,080 | 0.28% | 2,814 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $290 | 0.02% | 200 | Shares | Defined | 2026-05-05 | ||||
| Large JONES FINANCIAL COMPANIES LLLP | $145 | 0.01% | 100 | Shares | Sole | 2026-05-15 | ||||
| Mega ROYAL BANK OF CANADA Bank | $100 | 0.01% | 69 | Shares | Defined | 2026-05-15 | ||||
| Mega WELLS FARGO & COMPANY/MN | $0 | 0.00% | 0 | Shares | Defined | 2026-05-11 | ||||
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