American Shared Hospital Services
US ˙ NYSEAM ˙ US0295951059

SecurityAMS / American Shared Hospital Services
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership229,954 shares
Ownership 4.29%
Dimensional Fund Advisors Lp ownership in AMS / American Shared Hospital Services

2015-02-05 - Dimensional Fund Advisors Lp has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 229,954 shares of American Shared Hospital Services (US:AMS). This represents 4.29 percent ownership of the company.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2015-02-05 2015-02-05 13G/A 229,954 4.29
2014-02-10 2014-02-10 13G/A 232,397 5.04
2013-02-11 2013-02-11 13G 234,097 5.08
2012-02-14 2012-02-14 13G 234,084 5.08

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 205,120 -1,294 -0.63 297 -31.72 0.0000
2026-02-12 2025-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 206,414 -3,545 -1.69 436 -25.89 0.0001
2025-11-12 2025-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 209,959 0 0.00 588 16.01 0.0001
2025-08-12 2025-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 209,959 0 0.00 506 -13.21 0.0001
2025-05-13 2025-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 209,959 0 0.00 584 -12.86 0.0001
2025-02-13 2024-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 209,959 603 0.29 670 4.86 0.0002
2024-11-07 2024-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 209,356 29,719 16.54 639 11.34 0.0002
2024-08-09 2024-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 179,637 8,436 4.93 574 13.47 0.0001
2024-05-10 2024-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 171,201 5,145 3.10 505 27.85 0.0001
2024-02-07 2023-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 166,056 0 0.00 395 -3.66 0.0001
2023-11-09 2023-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 166,056 0 0.00 410 -3.30 0.0001
2023-08-09 2023-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 166,056 0 0.00 424 -9.01 0.0001
2023-05-12 2023-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 166,056 7,375 4.65 467 0.0002
2023-02-09 2022-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 158,681 5,899 3.86 0 -100.00 0.0001
2022-11-10 2022-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 152,782 1,254 0.83 395 17.21 0.0002
2022-08-12 2022-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 151,528 1,767 1.18 337 -3.71 0.0001
2022-05-13 2022-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 149,761 0 0.00 350 -1.41 0.0001
2022-02-09 2021-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 149,761 -1,701 -1.12 355 -15.07 0.0001
2021-11-12 2021-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 151,462 -69,377 -31.42 418 -35.39 0.0001
2021-08-12 2021-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 220,839 -23,884 -9.76 647 -4.57 0.0002
2021-05-14 2021-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 244,723 63,294 34.89 678 68.24 0.0002
2021-03-08 2020-12-31 13F/A-2 AMERICAN SHARED HOSPITAL SVC COM 029595105 181,429 -24,951 -12.09 403 7.75 0.0001
2021-02-11 2020-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 181,429 -24,951 403 145.5422
2020-11-12 2020-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 206,380 -38,488 -15.72 374 -28.63 0.0002
2020-08-13 2020-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 244,868 -1,121 -0.46 524 37.53 0.0002
2020-05-14 2020-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 245,989 0 0.00 381 -36.50 0.0002
2020-02-14 2019-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 245,989 0 0.00 600 -2.76 0.0002
2019-11-12 2019-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 245,989 1,000 0.41 617 -12.23 0.0002
2019-08-13 2019-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 244,989 0 0.00 703 3.23 0.0003
2019-08-12 2019-03-31 13F/A-2 AMERICAN SHARED HOSPITAL SVC COM 029595105 244,989 0 0.00 681 16.81 0.0003
2019-05-10 2019-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 244,989 0 681
2019-02-26 2018-12-31 13F/A-1 AMERICAN SHARED HOSPITAL SVC COM 029595105 244,989 0 0.00 583 -31.97 0.0003
2019-02-13 2018-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 244,989 0 583
2018-11-13 2018-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 244,989 3,914 1.62 857 29.26 0.0003
2018-08-10 2018-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 241,075 4,864 2.06 663 10.13 0.0003
2018-05-11 2018-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 236,211 0 0.00 602 -1.79 0.0003
2018-02-12 2017-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 236,211 0 0.00 613 -8.92 0.0003
2017-11-13 2017-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 236,211 0 0.00 673 -27.87 0.0003
2017-08-11 2017-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 236,211 0 0.00 933 -9.15 0.0004
2017-05-12 2017-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 236,211 6,257 2.72 1,027 33.38 0.0005
2017-02-09 2016-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 770 7.99 0.0004
2016-11-10 2016-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 713 52.68 0.0004
2016-08-09 2016-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 467 -8.43 0.0003
2016-05-13 2016-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 510 20.57 0.0003
2016-02-10 2015-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 423 -4.30 0.0003
2015-11-13 2015-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 442 -24.32 0.0003
2015-08-14 2015-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 584 0.00 0.0004
2015-05-14 2015-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 0 0.00 584 -10.84 0.0004
2015-02-06 2014-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 229,954 -2,300 -0.99 655 27.68 0.0004
2014-11-13 2014-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 232,254 0 0.00 513 -15.07 0.0004
2014-08-08 2014-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 232,254 -143 -0.06 604 -19.03 0.0004
2014-05-14 2014-03-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 232,397 0 0.00 746 15.84 0.0006
2014-02-12 2013-12-31 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 232,397 -433 -0.19 644 8.05 0.0005
2013-11-13 2013-09-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 232,830 -1,267 -0.54 596 16.18 0.0005
2013-08-15 2013-06-30 13F AMERICAN SHARED HOSPITAL SVC COM 029595105 234,097 234,097 513 0.0005
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.