美國超導公司
MX ˙ BMV ˙ US0301112076
SecurityMX:AMSC / American Superconductor Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership393,224 shares
Latest Disclosed Value $ 13,310,632
Northern Trust Corp reports 8.98% increase in ownership of AMSC / American Superconductor Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 393,224 shares of American Superconductor Corporation (MX:AMSC) valued at $13,310,632 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 360,806 shares of American Superconductor Corporation. This represents a change in shares of 8.98% during the quarter.

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)
2026-05-14 2026-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 393,224 32,418 8.98 13,311 28.19 0.0004
2026-02-17 2025-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 360,806 -31,461 -8.02 10,384 -55.43 0.0013
2025-11-14 2025-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 392,267 50,718 14.85 23,297 85.91 0.0030
2025-08-13 2025-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 341,549 11,036 3.34 12,531 109.02 0.0017
2025-05-13 2025-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 330,513 2,708 0.83 5,996 -25.74 0.0009
2025-02-14 2024-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 327,805 26,819 8.91 8,074 13.66 0.0011
2024-11-13 2024-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 300,986 213,235 243.00 7,103 246.15 0.0012
2024-08-14 2024-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 87,751 16,038 22.36 2,052 111.98 0.0003
2024-05-14 2024-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 71,713 12,620 21.36 969 47.11 0.0002
2024-02-13 2023-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 59,093 5,363 9.98 658 62.47 0.0001
2023-11-13 2023-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 53,730 -216 -0.40 406 20.18 0.0001
2023-08-11 2023-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 53,946 1,203 2.28 338 30.62 0.0001
2023-05-15 2023-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 52,743 2,430 4.83 259 39.46 0.0001
2023-02-13 2022-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 50,313 2,825 5.95 185 -11.06 0.0000
2022-11-14 2022-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 47,488 0 0.00 208 -15.45 0.0000
2022-08-12 2022-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 47,488 -182,187 -79.32 246 -85.93 0.0001
2022-05-13 2022-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 229,675 -10,581 -4.40 1,748 -33.13 0.0003
2022-02-08 2021-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 240,256 -6,471 -2.62 2,614 -27.35 0.0004
2021-11-15 2021-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 246,727 2,563 1.05 3,598 -15.26 0.0006
2021-08-13 2021-06-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 244,164 -10,522 -4.13 4,246 -12.07 0.0007
2021-05-12 2021-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 254,686 -21,679 -7.84 4,829 -25.39 0.0009
2021-02-11 2020-12-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 276,365 39,032 16.45 6,472 88.30 0.0013
2020-11-16 2020-09-30 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 237,333 -6,688 -2.74 3,437 73.24 0.0008
2020-08-14 2020-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 244,021 5,209 2.18 1,984 51.68 0.0005
2020-05-14 2020-03-31 13F AMERICAN SUPERCONDUCTOR SHS NEW 030111207 238,812 6,195 2.66 1,308 -28.37 0.0004
2020-02-14 2019-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 232,617 4,853 2.13 1,826 2.24 0.0004
2019-11-13 2019-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 227,764 170,884 300.43 1,786 238.26 0.0004
2019-08-13 2019-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 56,880 17,655 45.01 528 4.76 0.0001
2019-05-13 2019-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 39,225 201 0.52 504 15.86 0.0001
2019-02-12 2018-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 39,024 -4,977 -11.31 435 42.16 0.0001
2018-11-14 2018-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 44,001 0 0.00 306 -0.65 0.0001
2018-09-18 2018-06-30 13F/A-1 AMERICAN SUPERCONDUCTOR COM 030111207 44,001 150 0.34 308 20.78 0.0001
2018-08-14 2018-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 44,001 150 308
2018-05-09 2018-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 43,851 1,182 2.77 255 64.52 0.0001
2018-02-14 2017-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 42,669 327 0.77 155 -19.69 0.0000
2017-11-13 2017-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 42,342 15,438 57.38 193 54.40 0.0001
2017-08-11 2017-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 26,904 -91,015 -77.18 125 -84.55 0.0000
2017-05-12 2017-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 117,919 -753 -0.63 809 -7.44 0.0002
2017-02-13 2016-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 118,672 -474 -0.40 874 4.55 0.0003
2016-11-09 2016-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 119,146 76,741 180.97 836 133.52 0.0003
2016-08-12 2016-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 42,405 21,012 98.22 358 119.63 0.0001
2016-08-19 2016-03-31 13F/A-1 AMERICAN SUPERCONDUCTOR COM 030111207 21,393 1,359 6.78 163 27.34 0.0001
2016-05-13 2016-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 21,393 163
2016-02-12 2015-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 20,034 0 0.00 128 48.84 0.0000
2015-11-12 2015-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 20,034 7,248 56.69 86 28.36 0.0000
2015-08-13 2015-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111207 12,786 -2,094 -14.07 67 -30.21 0.0000
2015-05-14 2015-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111207 14,880 -137,845 -90.26 96 -15.04 0.0000
2015-02-12 2014-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 152,725 -1,942 -1.26 113 -48.40 0.0000
2014-11-13 2014-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 154,667 -376,594 -70.89 219 -74.71 0.0001
2014-08-14 2014-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 531,261 -82,506 -13.44 866 -12.35 0.0003
2014-05-14 2014-03-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 613,767 -49,512 -7.46 988 -9.19 0.0003
2014-02-21 2013-12-31 13F/A-1 AMERICAN SUPERCONDUCTOR COM 030111108 663,279 44,755 7.24 1,088 -24.86 0.0003
2014-02-12 2013-12-31 13F AMERICAN SUPERCONDUCTOR COM 030111108 663,279 1,088
2013-11-13 2013-09-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 618,524 45,575 7.95 1,448 -4.30 0.0005
2013-08-09 2013-06-30 13F AMERICAN SUPERCONDUCTOR COM 030111108 572,949 572,949 1,513 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.