American Superconductor Corporation
US ˙ NasdaqGS ˙ US0301112076

SecurityAMSC / American Superconductor Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership633,841 shares
Latest Disclosed Value $ 21,455,567
Morgan Stanley reports 10.15% decrease in ownership of AMSC / American Superconductor Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 633,841 shares of American Superconductor Corporation (US:AMSC) valued at $21,455,518 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 705,442 shares of American Superconductor Corporation. This represents a change in shares of -10.15% during the quarter. The current value of the position is $29,410,222 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 633,841 -71,601 -10.15 21,456 5.68 0.0013
2026-05-27 2025-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 705,442 369,677 110.10 20,303 1.81 0.0012
2026-02-13 2025-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 705,442 369,677 20,303 0.0012
2026-05-27 2025-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 335,765 -234,591 -41.13 19,941 -4.71 0.0012
2025-11-14 2025-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 335,765 -234,591 19,941 0.0012
2025-08-15 2025-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 570,356 60,459 11.86 20,926 126.25 0.0014
2025-05-15 2025-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 509,897 71,726 16.37 9,250 -14.30 0.0007
2025-05-15 2024-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 438,171 60,766 16.10 10,792 21.18 0.0008
2025-02-14 2024-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 438,171 60,766 10,792 0.0008
2025-05-14 2024-09-30 13F/A-2 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 377,405 -429,011 -53.20 8,907 -52.78 0.0006
2025-02-14 2024-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 377,405 -429,011 8,907 0.0006
2024-11-14 2024-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 377,405 -429,011 8,907 0.0006
2025-05-14 2024-06-30 13F/A-2 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 806,416 290,000 56.16 18,862 170.38 0.0015
2024-10-17 2024-06-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 806,416 290,000 18,862 0.0015
2024-08-14 2024-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 806,416 290,000 18,862 0.0015
2024-10-17 2024-03-31 13F/A-2 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 516,416 355,031 219.99 6,977 288.20 0.0006
2024-08-16 2024-03-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 516,416 355,031 6,977 0.0001
2024-05-15 2024-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 516,416 355,031 6,977 0.0006
2024-08-16 2023-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 161,385 75,069 86.97 1,798 176.04 0.0002
2024-02-13 2023-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 161,385 75,069 1,798 0.0002
2023-11-15 2023-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 86,316 42,817 98.43 652 139.34 0.0001
2023-08-14 2023-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 43,499 -11,415 -20.79 272 1.12 0.0000
2023-05-15 2023-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 54,914 -3,403 -5.84 270 25.70 0.0000
2023-02-14 2022-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 58,317 -17,884 -23.47 215 -35.93 0.0000
2022-11-14 2022-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 76,201 -65,143 -46.09 334 -54.37 0.0000
2022-10-27 2022-06-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 141,344 54,687 63.11 732 10.74 0.0001
2022-08-15 2022-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 141,344 54,687 732 0.0000
2022-10-27 2022-03-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 86,657 10,993 14.53 661 -19.68 0.0001
2022-05-13 2022-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 86,657 10,993 661 0.0001
2022-02-14 2021-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 75,664 53,583 242.67 823 155.59 0.0001
2021-11-15 2021-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 22,081 9,231 71.84 322 44.39 0.0000
2021-08-23 2021-06-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 12,850 -88,968 -87.38 223 -88.45 0.0000
2021-08-16 2021-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 12,850 -88,968 223 0.0000
2021-05-17 2021-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 101,818 36,498 55.88 1,931 26.29 0.0003
2021-02-16 2020-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 65,320 40,381 161.92 1,529 323.55 0.0002
2020-11-13 2020-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 24,939 7,657 44.31 361 156.03 0.0001
2020-08-14 2020-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 17,282 6,215 56.16 141 131.15 0.0000
2020-05-26 2020-03-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 11,067 -31,586 -74.05 61 -81.79 0.0000
2020-05-15 2020-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 11,067 -31,586 61 4.6861
2020-02-14 2019-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 42,653 31,050 267.60 335 264.13 0.0001
2019-11-14 2019-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 11,603 -2,750 -19.16 92 -30.83 0.0000
2019-08-14 2019-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 14,353 -7,564 -34.51 133 -52.84 0.0000
2019-05-15 2019-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 21,917 9,808 81.00 282 108.89 0.0001
2019-02-14 2018-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 12,109 8,232 212.33 135 400.00 0.0000
2019-04-23 2018-09-30 13F/A-2 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 3,877 2,123 121.04 27 107.69 0.0000
2018-11-20 2018-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 3,877 0 27 0.0000
2018-11-14 2018-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 3,877 2,123 27
2019-04-23 2018-06-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 1,754 -5,239 -74.92 13 -68.29 0.0000
2018-08-14 2018-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 1,754 -5,239 13
2019-04-23 2018-03-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 6,993 -7,594 -52.06 41 -21.15 0.0000
2018-05-14 2018-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 6,993 -7,594 41
2019-04-23 2017-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 14,587 3,508 31.66 52 1.96 0.0000
2018-02-14 2017-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 14,587 3,508 52
2017-11-14 2017-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 11,079 -2,082 -15.82 51 -16.39 0.0000
2017-08-11 2017-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 13,161 -8,817 -40.12 61 -59.60 0.0000
2017-05-22 2017-03-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 21,978 -16,539 -42.94 151 -46.64 0.0000
2017-05-12 2017-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 21,978 151
2017-02-22 2016-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 38,517 28,397 280.60 283 298.59 0.0001
2017-02-13 2016-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 38,517 283
2016-11-10 2016-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 10,120 -20,646 -67.11 71 -72.59 0.0000
2016-08-12 2016-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 30,766 21,649 237.46 259 270.00 0.0001
2016-05-12 2016-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 9,117 -7,684 -45.74 70 -34.58 0.0000
2016-02-09 2015-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 16,801 13,581 421.77 107 664.29 0.0000
2016-02-08 2015-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR SHS NEW 030111207 3,220 -800 -19.90 14 -33.33 0.0000
2015-11-09 2015-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 3,220 14
2015-08-12 2015-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 4,020 -1,161 -22.41 21 -36.36 0.0000
2015-05-14 2015-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 5,181 -37,231 -87.78 33 3.13 0.0000
2015-02-13 2014-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 42,412 -65,626 -60.74 32 -79.08 0.0000
2014-12-16 2014-09-30 13F/A-1 AMERICAN SUPERCONDUCTOR COM 030111108 108,038 -41,288 -27.65 153 -37.30 0.0001
2014-11-14 2014-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 108,038 153
2014-08-12 2014-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 149,326 -13,584 -8.34 244 -6.87 0.0004
2014-05-13 2014-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 162,910 -97,895 -37.54 262 -38.79 0.0001
2014-02-13 2013-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 260,805 160,899 161.05 428 82.91 0.0002
2013-11-13 2013-09-30 13F AMERICAN SUPERCONDUCTOR COR COM 030111108 99,906 -31 -0.03 234 -11.03 0.0001
2013-08-08 2013-06-30 13F AMERICAN SUPERCONDUCTOR COR COM 030111108 99,937 99,937 263 0.0001
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.