American Superconductor Corporation
US ˙ NasdaqGS ˙ US0301112076

SecurityAMSC / American Superconductor Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership658,297 shares
Latest Disclosed Value $ 22,277,858
Dimensional Fund Advisors Lp reports 21.85% increase in ownership of AMSC / American Superconductor Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 658,297 shares of American Superconductor Corporation (US:AMSC) valued at $22,283,353 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 540,253 shares of American Superconductor Corporation. This represents a change in shares of 21.85% during the quarter. The current value of the position is $27,872,295 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.

Upgrade to unlock premium data and export to Excel .

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 SUPERCONDUCTOR SHS NEW 030111207 658,297 118,044 21.85 22,278 43.27 0.0046
2026-02-12 2025-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 540,253 68,769 14.59 15,549 -44.48 0.0033
2025-11-12 2025-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 471,484 -9,269 -1.93 28,006 58.79 0.0060
2025-08-12 2025-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 480,753 -187,399 -28.05 17,638 45.50 0.0041
2025-05-13 2025-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 668,152 13,853 2.12 12,122 -24.79 0.0030
2025-02-13 2024-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 654,299 46,354 7.62 16,117 12.35 0.0039
2024-11-07 2024-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 607,945 75,729 14.23 14,345 15.21 0.0035
2024-08-09 2024-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 532,216 -48,331 -8.33 12,451 58.75 0.0033
2024-05-10 2024-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 580,547 -103,151 -15.09 7,843 2.98 0.0021
2024-02-07 2023-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 683,698 -8,395 -1.21 7,617 45.76 0.0022
2023-11-09 2023-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 692,093 97,472 16.39 5,225 40.42 0.0017
2023-08-09 2023-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 594,621 89,230 17.66 3,721 49.98 0.0012
2023-05-12 2023-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 505,391 44,139 9.57 2,481 248,000.00 0.0008
2023-02-09 2022-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 461,252 108,929 30.92 2 -99.94 0.0005
2022-11-10 2022-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 352,323 10,657 3.12 1,544 -12.77 0.0006
2022-08-12 2022-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 341,666 22,781 7.14 1,770 -27.07 0.0006
2022-05-13 2022-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 318,885 83,984 35.75 2,427 -5.05 0.0007
2022-02-09 2021-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 234,901 12,520 5.63 2,556 -21.16 0.0008
2021-11-12 2021-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 222,381 -13,105 -5.57 3,242 -20.85 0.0010
2021-08-12 2021-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 235,486 -7,914 -3.25 4,096 -11.23 0.0013
2021-05-14 2021-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 243,400 12,672 5.49 4,614 -14.60 0.0015
2021-03-08 2020-12-31 13F/A-2 AMERICAN SUPERCONDUCTOR CLA 030111207 230,728 30,465 15.21 5,403 86.18 0.0020
2021-02-11 2020-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 230,728 30,465 5,403 1,951.2764
2020-11-12 2020-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 200,263 3,848 1.96 2,902 81.72 0.0012
2020-08-13 2020-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 196,415 -34,985 -15.12 1,597 26.05 0.0007
2020-05-14 2020-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 231,400 33,077 16.68 1,267 -18.63 0.0007
2020-02-14 2019-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 198,323 117,599 145.68 1,557 145.97 0.0006
2019-11-12 2019-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 80,724 13,219 19.58 633 1.12 0.0002
2019-08-13 2019-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 67,505 -1 -0.00 626 -27.88 0.0002
2019-08-12 2019-03-31 13F/A-2 AMERICAN SUPERCONDUCTOR CLA 030111207 67,506 -431 -0.63 868 14.66 0.0003
2019-05-10 2019-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 67,506 -431 868
2019-02-26 2018-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR CLA 030111207 67,937 -1,238 -1.79 757 57.38 0.0003
2019-02-13 2018-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 67,937 -1,238 757
2018-11-13 2018-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 69,175 0 0.00 481 -0.62 0.0002
2018-08-10 2018-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 69,175 0 0.00 484 20.10 0.0002
2018-05-11 2018-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 69,175 0 0.00 403 60.56 0.0002
2018-02-12 2017-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 69,175 0 0.00 251 -20.06 0.0001
2017-11-13 2017-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 69,175 31,679 84.49 314 81.50 0.0001
2017-08-11 2017-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 37,496 2,600 7.45 173 -27.62 0.0001
2017-05-12 2017-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 34,896 -123 -0.35 239 -7.36 0.0001
2017-02-09 2016-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 35,019 0 0.00 258 5.31 0.0001
2016-11-10 2016-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 35,019 6,238 21.67 245 0.82 0.0001
2016-08-09 2016-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 28,781 0 0.00 243 10.96 0.0001
2016-05-13 2016-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 28,781 0 0.00 219 19.67 0.0001
2016-02-10 2015-12-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 28,781 -43 -0.15 183 46.40 0.0001
2015-11-13 2015-09-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 28,824 0 0.00 125 -17.22 0.0001
2015-08-14 2015-06-30 13F AMERICAN SUPERCONDUCTOR CLA 030111207 28,824 -2,599 -8.27 151 -25.25 0.0001
2015-05-14 2015-03-31 13F AMERICAN SUPERCONDUCTOR CLA 030111207 31,423 -350,621 -91.78 202 -28.62 0.0001
2015-02-06 2014-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 382,044 -30,485 -7.39 283 -51.37 0.0002
2014-11-13 2014-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 412,529 -35,183 -7.86 582 -20.27 0.0004
2014-08-08 2014-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 447,712 0 0.00 730 1.25 0.0005
2014-05-14 2014-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 447,712 -3,978 -0.88 721 -2.70 0.0005
2014-02-12 2013-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 451,690 36,480 8.79 741 -23.77 0.0006
2013-11-13 2013-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 415,210 -4,076 -0.97 972 -12.20 0.0008
2013-08-15 2013-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 419,286 419,286 1,107 0.0010
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.