Comparable stake leader
Raymond C. Stachowiak
SEC ownership of AMERICAN SHARED HOSPITAL SERVICES
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000744825.
Disclosed value leader
Raymond C. Stachowiak
Comparable rows
22/33
Latest evidence
22 Jul 2026
- Public ticker
- AMS on NYSE
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Raymond C. Stachowiak
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
22 of 33
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Raymond C. Stachowiak
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
22 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000744825
- Issuer location
- San Francisco, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of AMERICAN SHARED HOSPITAL SERVICES (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
Raymond C. Stachowiak
Disclosed value leader
Raymond C. Stachowiak
Comparable rows
22/33
Latest evidence
22 Jul 2026
3/4/5
13D/G
13F
Lead comparable stake: 35%
11 rows are not safely comparable across share classes.
13D/G row: Raymond C. Stachowiak
Showing 1-8 of 33 holder rows.
Quick read
Raymond C. Stachowiak leads the comparable SEC ownership view at 35%.
22 of 33 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 Raymond C. Stachowiak's linked filing trail.
Comparable ownership
Top 5
Raymond C. Stachowiak
35%
Craig K. Tagawa
0.51%
Alexis Tirrito
0.14%
DIMENSIONAL FUND ADVISORS LP
3%
Corient Private Wealth LLC
2.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 33 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Raymond C. Stachowiak |
3/4/5
13D/G
Executive Chairman, Director, 10%+ Owner · Stachowiak Raymond C
|
35%
from 13D/G
|
$5,397,844
3,260,764 shares
mixed-class rows
|
+$1,337,147 | 22 Jul 2026 |
| Craig K. Tagawa |
3/4/5
President
|
0.51%
|
$94,077
35,501 shares
|
— | 30 Apr 2025 |
| Alexis Tirrito |
3/4/5
Interim CFO, CAO and Secretary
|
0.14%
|
$13,969
9,634 shares
|
— | 07 Jul 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
3%
|
$297,424
205,120 shares
|
— | 31 Mar 2026 |
| Corient Private Wealth LLC |
13F
Company
|
2.3%
|
$232,811
160,559 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
2.2%
|
$222,919
153,737 shares
|
— | 31 Mar 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC |
13F
Company
|
1.3%
|
$131,689
90,820 shares
|
— | 31 Mar 2026 |
| LPL Financial LLC |
13F
Company
|
1.1%
|
$110,731
76,366 shares
|
— | 31 Mar 2026 |
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.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$1,337,147.
Buys
$1,337,147
Insiders: 1
Sells
$0
Insiders: 0
Net
+$1,337,147
Shares: +586,468
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 586,468
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 586,468 | 0 | $1,337,147 | $0 | +$1,337,147 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-14 of 14 reporting-owner rows connected to AMERICAN SHARED HOSPITAL SERVICES. Open a relationship link for the CIK-to-CIK filing trail.
Rows
14
Largest Forms 3/4/5 holder
Raymond C. Stachowiak
Net 12M change
+$1,337,147
Latest report
22 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Raymond C. Stachowiak | Executive Chairman, Director, 10%+ Owner | $5,397,844 | +$1,337,147 | +33% | Mixed | 22 Jul 2026 |
| Gary Delanois | Chief Operating Officer | $324,000 | Mixed | 14 Oct 2024 | ||
| David A. Larson | Director | $242,503 | Mixed | 25 Jun 2021 | ||
| Saim Mert Ozyurek | Director | $172,940 | Mixed | 25 Jun 2021 | ||
| Raymond Scott Frech | Chief Financial Officer | $135,000 | Mixed | 19 Dec 2024 | ||
| Daniel G. Kelly Jr. | Director | $134,093 | Mixed | 25 Jun 2021 | ||
| Peter M. Gaccione | Chief Executive Officer | $121,500 | Mixed | 28 Mar 2023 | ||
| Sandra Aj Lawrence | Director | $103,607 | Mixed | 25 Jun 2021 | ||
| Craig K. Tagawa | President | $94,077 | Mixed | 30 Apr 2025 | ||
| Ernest R. Bates | Sr.VP Sales and Business Devel | $71,669 | Mixed | 01 Apr 2022 | ||
| Robert L. Hiatt | Chief Financial Officer | $48,600 | Mixed | 17 Apr 2023 | ||
| Alexis Tirrito | Interim CFO, CAO and Secretary | $13,969 | Mixed | 07 Jul 2026 | ||
| Kathleen Miles | Director | $8,100 | Mixed | 28 Dec 2021 | ||
| Vicki L. Wilson | Director | $8,100 | Mixed | 28 Dec 2021 |
Recent insider transactions for AMERICAN SHARED HOSPITAL SERVICES
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Raymond C. Stachowiak | AMS | Warrant (right to buy) | Award | 220,000 | 220,000 | 22 Jul 2026 | By RCS/TIG Holdings LLC | |||
| Raymond C. Stachowiak | AMS | Common Stock No Par Value | Purchase | $1,337,147 | $2.28 | 586,468 | 586,468 | 22 Jun 2026 | By RCS/TIG Holdings LLC | |
| Raymond C. Stachowiak | AMS | Common Stock, No Par Value | Award | 14.8% | 100,000 | 774,678 | 26 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.