$AMS

$1.25 +$0.00 (0.0%) After hours

$AMS Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 6.7M shares outstanding

Who owns AMS?

By type of holder

Institutions 7.6% Insiders 3.9% Everyone else 88.5%

Concentration Top 10 holders own 43.3%

Stachowiak Raymond C 36.7% · Dimensional Fund Advisors LP 1.5%

Institutional ownership

7.6%

-7.3 pts vs last qtr

Institutional holders

-1 vs last qtr

Net shares bought

−486.6K

by institutions in Q2 2026

New / sold out

4 / 5

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

XTX Topco Ltd NEW +19.1K
UBS Group AG +18.2K

Biggest sellers in Q2 2026

Corient Private Wealth LP SOLD OUT −160.6K
Dimensional Fund Advisors LP −103.0K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for American Shared Hospital Services in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+18.5%

+1.90% a year

Each share's claim on the business

−15.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $3.28M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years55% 3–5 years11% 1–3 years8% Under 1 year26%

Quarterly turnover

29.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting AMS on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
DF Dimensional Fund Advisors LP	102.1K	1.54%	−103.0K (−50.2%)	≤2021	0.0%
Shares held by quarter Peak holding210.0K (Q4'24) Change over 8 quarters−107.2K Share of the company1.540% Dimensional Fund Advisors LP's full portfolio →
CP Corient Private Wealth LP	—	—	SOLD OUT	—	0.0%
Shares held by quarter Peak holding321.1K (Q4'25) Change over 8 quarters−160.6K Corient Private Wealth LP's full portfolio →

Dimensional Fund Advisors LP

102.1K

% of company

1.54%

Change vs last qtr

−103.0K (−50.2%)

Held since

≤2021

Corient Private Wealth LP

—

% of company

—

Change vs last qtr

SOLD OUT

Held since

—

22 more super investors behind a free account

See every manager holding American Shared Hospital Services, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting AMS on Form N-PORT; together they hold 6.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$142K	98.1K	1.47%	0.00%	March 31, 2026
US U.S. Small Cap Value Portfolio Dfa Investment Dimensions Group Inc	$138K	92.1K	1.38%	0.00%	July 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$142K

% of company

1.47%

% of the fund

0.00%

As of

March 31, 2026

U.S. Small Cap Value Portfolio

Dfa Investment Dimensions Group Inc

Position value

$138K

% of company

1.38%

% of the fund

0.00%

As of

July 31, 2026

15 more funds behind a free account

See every fund holding American Shared Hospital Services and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
SR Stachowiak Raymond C 5%+ holder 13D · 35.3%	2.4M	36.69%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company36.690% Disclosed stake13D · 35.3% View the 13D/G filing →
TC Tagawa Craig Kenji Insider	29.9K	0.45%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.450% Tagawa Craig Kenji's insider activity →

Stachowiak Raymond C

5%+ holder13D · 35.3%

2.4M

% of company

36.69%

Change vs last qtr

—

Held since

—

Tagawa Craig Kenji

Insider

29.9K

% of company

0.45%

Change vs last qtr

—

Held since

—

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