Holder evidence
33
SEC ownership of AMERICAN SHARED HOSPITAL SERVICES
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000744825.
Lead holder
Raymond C. Stachowiak
13D/G signal
Raymond C. Stachowiak
Latest evidence
31 Mar 2026
- CIK
- 0000744825
- Symbol
- AMS on NYSE
- Location
- San Francisco, CA
- SEC evidence mix
- 3/4/5, 13D/G, and 13F
- Lead holder
- Raymond C. Stachowiak
- Latest large-stake holder
- Raymond C. Stachowiak
- Latest evidence date
- 31 Mar 2026
Issuer identity
Ownership snapshot
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.
Lead holder
Raymond C. Stachowiak
13D/G signal
Raymond C. Stachowiak
Evidence rows
33
Latest as of
31 Mar 2026
3/4/5
13D/G
13F
Lead comparable stake: 24%
13D/G row: Raymond C. Stachowiak
Showing 1-8 of 33 holder rows.
Rank 1 holder
Raymond C. Stachowiak
3/4/5
13D/G
- Ownership
- 24%
- Position
- $5.84M
Rank 2 holder
Anita G. Zucker
13D/G
- Ownership
- 9.1%
- Position
- $1.6M
Rank 3 holder
Craig K. Tagawa
3/4/5
- Ownership
- 0.54%
- Position
- $94.1K
| 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
|
24%
from 13D/G
|
$5,840,249
2,454,296 shares
|
— | 26 Mar 2026 |
| Anita G. Zucker |
13D/G
|
9.1%
|
$1,595,193
586,468 shares
|
+$213,115 | 08 May 2025 |
| Craig K. Tagawa |
3/4/5
President
|
0.54%
|
$94,077
35,501 shares
|
— | 30 Apr 2025 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
3.1%
|
$297,424
205,120 shares
|
— | 31 Mar 2026 |
| Corient Private Wealth LLC |
13F
Company
|
2.4%
|
$232,811
160,559 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
2.3%
|
$222,919
153,737 shares
|
— | 31 Mar 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC |
13F
Company
|
1.4%
|
$131,689
90,820 shares
|
— | 31 Mar 2026 |
| LPL Financial LLC |
13F
Company
|
1.2%
|
$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
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 31 May 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 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 1-13 of 13 reporting-owner rows connected to AMERICAN SHARED HOSPITAL SERVICES. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Lead holder
Raymond C. Stachowiak
Net 12M change
$0
Latest report
26 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Raymond C. Stachowiak | Executive Chairman, Director, 10%+ Owner | $5,840,249 | Mixed | 26 Mar 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 | ||
| Vicki L. Wilson | Director | $8,100 | Mixed | 28 Dec 2021 | ||
| Kathleen Miles | Director | $8,100 | Mixed | 28 Dec 2021 |
Recent insider transactions for AMERICAN SHARED HOSPITAL SERVICES
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Reported value | Reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Raymond C. Stachowiak | AMS | Common Stock, No Par Value | Award | 14.8% | 100,000 | 774,678 | 26 Mar 2026 | Direct | ||
| Raymond C. Stachowiak | AMS | Common Stock, No Par Value | Award | 19.8% | 110,000 | 664,678 | 26 Jun 2025 | Direct |
* indicates a reported price that failed the local validity check.