미국 초전도체 공사
US ˙ NasdaqGS ˙ US0301112076

SecurityAMSC / American Superconductor Corporation
InstitutionGmt Capital Corp
ManagerThomas E. Claugus
Latest Disclosed Ownership108,066 shares
Latest Disclosed Value $ 3,658,034
Gmt Capital Corp ownership in AMSC / American Superconductor Corporation

On May 15, 2026 - Gmt Capital Corp filed a 13F-HR form disclosing ownership of 108,066 shares of American Superconductor Corporation (US:AMSC) valued at $3,658,034 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 0 shares of American Superconductor Corporation. The current value of the position is $5,014,262 USD.

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)
2026-05-15 2026-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 108,066 3,658 0.1669
2026-02-13 2025-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -108,066 -100.00 0 -100.00
2025-11-14 2025-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 6,418 61.91 0.2909
2025-08-14 2025-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 3,965 102.24 0.1659
2025-05-15 2025-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 1,960 -26.34 0.1041
2025-02-14 2024-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 2,662 4.35 0.1297
2024-11-14 2024-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 2,550 0.91 0.1018
2024-08-14 2024-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 2,528 73.20 0.0934
2024-05-13 2024-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 108,066 1,460 0.0575
2024-02-12 2023-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -108,066 -100.00 0 -100.00
2023-11-13 2023-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 816 20.56 0.0307
2023-08-10 2023-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 676 27.55 0.0256
2023-05-09 2023-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 108,066 531 0.0208
2023-02-03 2022-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -108,066 -100.00 0 -100.00
2022-11-10 2022-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 473 -15.54 0.0294
2022-08-10 2022-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 560 -31.87 0.0356
2022-05-11 2022-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 108,066 822 0.0516
2022-02-11 2021-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -108,066 -100.00 0 -100.00
2021-11-09 2021-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 1,576 -16.13 0.1391
2021-08-13 2021-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 0 0.00 1,879 -8.30 0.1403
2021-05-13 2021-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 108,066 108,066 2,049 0.1505
2021-02-09 2020-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -511,945 -100.00 0 -100.00
2020-11-13 2020-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 511,945 0 0.00 7,413 78.11 0.5393
2020-08-14 2020-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 511,945 213,025 71.26 4,162 154.09 0.2342
2020-05-13 2020-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 298,920 260,539 678.82 1,638 444.19 0.0919
2020-02-14 2019-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 38,381 -480,364 -92.60 301 -92.60 0.0116
2019-11-13 2019-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 518,745 0 0.00 4,067 -15.52 0.1501
2019-08-14 2019-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 518,745 0 0.00 4,814 -27.84 0.1682
2019-05-13 2019-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 518,745 518,745 6,671 0.2207
2019-02-13 2018-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -31,100 -100.00 0 -100.00
2019-08-02 2018-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 0 0.00 216 -0.92 0.0056
2018-11-14 2018-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 0 216
2018-11-13 2018-06-30 13F/A-2 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 31,100 0.00 218 0.00 0.0052
2018-08-15 2018-06-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 31,100 218 0.0053
2018-08-14 2018-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 31,100 218
2018-02-13 2017-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 0 -31,100 -100.00 0 -100.00
2017-11-13 2017-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 31,100 141 0.0028
2017-11-09 2017-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 31,100 31,100 141 0.0030
2017-08-14 2017-06-30 13F American Superconductor COM 030111207 0 -31,100 -100.00 0 -100.00
2017-05-25 2017-03-31 13F/A-1 American Superconductor COM 030111207 31,100 31,100 213 0.0045
2017-05-12 2017-03-31 13F American Superconductor COM 030111207 31,100 31,100 213 0.0049
2016-11-10 2016-09-30 13F American Superconductor COM 030111207 0 -109,406 -100.00 0 -100.00
2016-08-06 2016-06-30 13F American Superconductor COM 030111207 109,406 -650 -0.59 923 10.41 0.0223
2016-05-11 2016-03-31 13F American Superconductor COM 030111207 110,056 110,056 0.00 836 0.0205
2016-02-16 2015-12-31 13F American Superconductor COM 030111207 0 -41,465 -100.00 0 -100.00
2015-11-13 2015-09-30 13F American Superconductor COM 030111207 41,465 0 0.00 205 -5.53 0.0052
2015-07-31 2015-06-30 13F American Superconductor COM 030111207 41,465 41,465 217 0.0057
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.