Security key
029595105
AMERICAN SHARED HOSPITAL SERVICES - Common Stock, no par value (AMS)
CUSIP: 029595105
Q1 2021 13F Holders as of 31 Mar 2021
- Security type / class
- Equity / Common Stock, no par value
- Total 13F shares
- 670,401
- Total 13F value
- $1,856,620
- Share change
- +129,085
- SEC-reported price per share
- $2.77
- Number of holders
- 15
- Value change
- +$359,179
- Number of buys
- 9
- Number of sells
- 1
- Shares outstanding
- 6,585,388
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2021
Institutions
15
Top holders
10
AMS full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2021
Previous quarter: Q4 2020
AMERICAN SHARED HOSPITAL SERVICES SEC filings
AMERICAN SHARED HOSPITAL SERVICES company facts
Broader feeds
Reporting periods
Holder history for CUSIP 029595105
Recent filing periods:
Ownership snapshot
Top reported holders of AMS - AMERICAN SHARED HOSPITAL SERVICES - Common Stock, no par value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
DIMENSIONAL FUND ADVISORS LP
Disclosed value leader
DIMENSIONAL FUND ADVISORS LP
Comparable rows
14/14
Latest evidence
31 Dec 2020
13F
Lead comparable stake: 2.8%
Showing 1-6 of 14 holder rows.
Quick read
DIMENSIONAL FUND ADVISORS LP leads the comparable SEC ownership view at 2.8%.
14 of 14 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens DIMENSIONAL FUND ADVISORS LP's linked filing trail.
Comparable ownership
Top 5
DIMENSIONAL FUND ADVISORS LP
2.8%
BRIDGEWAY CAPITAL MANAGEMENT, LLC
1.9%
RENAISSANCE TECHNOLOGIES LLC
0.73%
VANGUARD GROUP INC
0.64%
Canton Hathaway, LLC
0.61%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 14 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
2.8%
|
$403,000
181,429 shares
|
— | 31 Dec 2020 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC |
13F
Company
|
1.9%
|
$278,000
125,200 shares
|
— | 31 Dec 2020 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
0.73%
|
$107,000
48,300 shares
|
— | 31 Dec 2020 |
| VANGUARD GROUP INC |
13F
Company
|
0.64%
|
$93,000
42,019 shares
|
— | 31 Dec 2020 |
| Canton Hathaway, LLC |
13F
Company
|
0.61%
|
$89,000
40,100 shares
|
— | 31 Dec 2020 |
| ACADIAN ASSET MANAGEMENT LLC |
13F
Company
|
0.53%
|
$76,000
34,680 shares
|
— | 31 Dec 2020 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2021
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
15
Shares
670,401
Rows available
15
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2021 vs Q4 2020 Across Filers
Q4 2020 holders
13
Q1 2021 holders
15
Holder diff
2
| Investor | Q4 2020 Shares | Q1 2021 Shares | Share Diff | Share Chg % | Q4 2020 value | Q1 2021 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend