Figures computed from official regulatory filings — .
Ownershipinsiders 34.72% · institutions 7.63% · short 0.1% of float
In USD · as of Oct 5, 2026
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American Shared Hospital Services provides technology solutions for stereotactic radiosurgery and advanced radiation therapy equipment and services. It operates in two segments: Leasing and Direct Patient Service. The company leases nine Gamma Knife systems and one proton beam radiation therapy (PBRT) system; and provides planning, installation, reimbursement, and marketing support services. It also owns and operates two single-unit Gamma Knife facilities that provides radiosurgery services directly to the patient. The company markets its solutions to cancer treatment centers, health systems, and cancer networks worldwide. American Shared Hospital Services was founded in 1980 and is based in San Francisco, California.
Market information source · Oct 5, 2026
SEC company identity · Oct 5, 2026
Open-market timeline · full history
43 buys101 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details |
|---|---|---|---|---|
| Stachowiak Raymond C | AwardD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Buy | $1.3M | conv 79Unusual sizeFirst in 12mo | SEC |
| Stachowiak Raymond C | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Tagawa Craig Kenji | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Frech Raymond Scott | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Delanois Gary | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| HIATT ROBERT L | AwardD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Gaccione Peter M | AwardD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Tagawa Craig Kenji | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Gaccione Peter M | AwardD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | ExerciseD (derivative) | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Exercise | $5.4K | SEC |
| Bates Ernest Robert | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Tagawa Craig Kenji | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Miles Kathleen | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Wilson Vicki L | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |
| Stachowiak Raymond C | Award | $176.4K | Unusual size | SEC |
| Larson David | Other | $5.9K | SEC |
| Larson David | ExerciseD (derivative) | $21.2K | SEC |
| Larson David | Exercise | $6.1K | SEC |
| Larson David | Award | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | SEC |