| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 7.1% | -18% | $52,659,761 | -$11,818,906 | 2,799,562 | -18% | BlackRock, Inc. | 31 Mar 2025 |
| BAILLIE GIFFORD & CO | 4.2% | -22% | $31,032,550 | -$8,588,740 | 1,649,790 | -22% | BAILLIE GIFFORD & CO | 31 Dec 2024 |
As of 30 Sep 2025, 269 institutional investors reported holding 32,699,122 shares of AMERICAN SUPERCONDUCTOR CORP /DE/ - Common Stock (AMSC). This represents 83% of the company’s total 39,430,451 outstanding shares.
The largest institutional shareholders of AMERICAN SUPERCONDUCTOR CORP /DE/ - Common Stock (AMSC) together control 58% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 9.2% | 3,629,296 | +6.1% | 0% | $215,543,880 |
| VANGUARD GROUP INC | 7.5% | 2,949,801 | +21% | 0% | $175,188,681 |
| BAILLIE GIFFORD & CO | 3.6% | 1,427,332 | -1.7% | 0.06% | $84,769,248 |
| Driehaus Capital Management LLC | 3.1% | 1,218,944 | +45% | 0.52% | $72,393,084 |
| GOLDMAN SACHS GROUP INC | 3% | 1,174,107 | +14% | 0.01% | $69,730,214 |
| STATE STREET CORP | 2.9% | 1,135,878 | +11% | 0% | $67,459,794 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.7% | 1,069,855 | +14% | 0% | $63,548,422 |
| Nuveen, LLC | 2.1% | 826,152 | -17% | 0.01% | $49,065,168 |
| FULLER & THALER ASSET MANAGEMENT, INC. | 2.1% | 809,945 | 0.16% | $48,102,610 | |
| Atreides Management, LP | 2% | 771,495 | -30% | 1.2% | $45,819,088 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.9% | 760,457 | +222% | 0.03% | $45,163,541 |
| D. E. Shaw & Co., Inc. | 1.9% | 752,703 | +463% | 0.04% | $44,703,031 |
| AWM Investment Company, Inc. | 1.9% | 745,470 | -52% | 4.2% | $44,273,463 |
| Telemark Asset Management, LLC | 1.7% | 690,000 | 0% | 3.9% | $40,979,100 |
| OBERWEIS ASSET MANAGEMENT INC/ | 1.7% | 665,700 | -0.37% | 1.5% | $39,535,923 |
| EMERALD ADVISERS, LLC | 1.3% | 521,183 | +4.2% | 0.99% | $30,953,058 |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 471,484 | -1.9% | 0.01% | $28,006,294 |
| MACQUARIE GROUP LTD | 1.2% | 465,221 | -43% | 0.03% | $27,629,000 |
| FIRST TRUST ADVISORS LP | 1.2% | 458,391 | +36% | 0.02% | $27,223,841 |
| WELLINGTON MANAGEMENT GROUP LLP | 1% | 399,246 | -7.5% | 0% | $23,711,220 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1% | 396,332 | +1323% | 0% | $23,540,000 |
| NORTHERN TRUST CORP | 0.99% | 392,267 | +15% | 0% | $23,296,737 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.98% | 388,226 | +20% | 0% | $23,056,742 |
| ROYCE & ASSOCIATES LP | 0.91% | 357,580 | -56% | 0.21% | $21,236,676 |
| MORGAN STANLEY | 0.85% | 335,764 | -41% | 0% | $19,941,041 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 506,454 | $15,148,680 | -$1,479,179 | $28.78 | 23 |
| 2025 Q3 | 32,699,122 | $1,940,989,113 | +$34,296,194 | $59.39 | 269 |
| 2025 Q2 | 32,674,941 | $1,198,935,937 | +$198,037,468 | $36.69 | 229 |
| 2025 Q1 | 27,561,821 | $500,035,199 | -$3,058,035 | $18.14 | 189 |
| 2024 Q4 | 27,510,991 | $677,838,545 | +$7,039,568 | $24.63 | 189 |
| 2024 Q3 | 27,198,756 | $641,943,924 | -$3,178,923 | $23.60 | 176 |
| 2024 Q2 | 27,070,985 | $633,219,738 | +$100,746,659 | $23.39 | 158 |
| 2024 Q1 | 23,096,328 | $312,019,714 | +$91,138,469 | $13.51 | 131 |
| 2023 Q4 | 55,409 | $617,256 | -$332,986 | $11.14 | 1 |
| 2023 Q3 | 13,211,092 | $99,743,161 | +$1,953,441 | $7.55 | 70 |
| 2023 Q2 | 13,089,728 | $81,939,104 | -$222,130 | $6.26 | 73 |
| 2023 Q1 | 13,147,412 | $64,554,884 | +$437,546 | $4.91 | 71 |
| 2022 Q4 | 13,098,179 | $48,195,729 | -$3,093,822 | $3.68 | 71 |
| 2022 Q3 | 13,485,021 | $59,066,617 | +$2,285,180 | $4.38 | 68 |
| 2022 Q2 | 13,204,833 | $68,073,175 | -$12,839,524 | $5.18 | 79 |
| 2022 Q1 | 15,204,290 | $115,824,677 | -$11,657,575 | $7.61 | 92 |
| 2021 Q4 | 15,832,041 | $172,210,014 | -$7,375,535 | $10.88 | 94 |
| 2021 Q3 | 16,264,568 | $237,076,919 | +$2,770,926 | $14.58 | 91 |
| 2021 Q2 | 15,970,046 | $277,864,400 | +$769,851 | $17.39 | 94 |
| 2021 Q1 | 15,784,208 | $299,277,209 | -$30,744,405 | $18.96 | 98 |
| 2020 Q4 | 16,761,448 | $392,547,072 | +$90,547,355 | $23.42 | 97 |
| 2020 Q3 | 13,459,797 | $194,925,440 | +$34,713,804 | $14.48 | 79 |
| 2020 Q2 | 11,198,524 | $91,036,333 | +$4,918,863 | $8.13 | 65 |
| 2020 Q1 | 10,655,307 | $58,278,894 | +$776,517 | $5.48 | 64 |
| 2019 Q4 | 10,490,251 | $81,966,184 | +$2,834,774 | $7.85 | 64 |
| 2019 Q3 | 10,080,170 | $79,023,800 | +$1,531,458 | $7.84 | 66 |
| 2019 Q2 | 9,788,545 | $90,834,016 | +$2,649,054 | $9.28 | 67 |
| 2019 Q1 | 9,153,671 | $117,711,039 | +$37,920,429 | $12.86 | 70 |
| 2018 Q4 | 6,254,039 | $69,724,033 | +$13,309,646 | $11.15 | 60 |
| 2018 Q3 | 5,048,295 | $35,081,021 | +$2,870,109 | $6.95 | 51 |
| 2018 Q2 | 4,596,718 | $32,175,021 | -$2,856,767 | $7.00 | 44 |
| 2018 Q1 | 5,057,951 | $29,430,017 | -$397,635 | $5.82 | 47 |
| 2017 Q4 | 5,307,581 | $19,265,011 | -$2,642,949 | $3.63 | 45 |
| 2017 Q3 | 5,962,544 | $27,066,014 | -$3,627,193 | $4.54 | 44 |
| 2017 Q2 | 6,725,031 | $31,079,707 | +$9,611,055 | $4.62 | 48 |
| 2017 Q1 | 4,410,318 | $30,253,304 | +$6,319,919 | $6.86 | 55 |
| 2016 Q4 | 4,177,830 | $30,789,449 | +$1,719,117 | $7.37 | 50 |
| 2016 Q3 | 3,933,971 | $27,574,062 | -$2,584,690 | $7.01 | 54 |
| 2016 Q2 | 4,207,301 | $35,508,186 | +$8,723,972 | $8.44 | 61 |
| 2016 Q1 | 3,201,749 | $24,325,140 | +$2,363,040 | $7.60 | 46 |
| 2015 Q4 | 2,866,858 | $18,260,000 | +$1,235,870 | $6.37 | 33 |
| 2015 Q3 | 2,774,057 | $12,032,009 | -$205,293 | $4.33 | 36 |
| 2015 Q2 | 2,752,933 | $14,395,384 | +$8,972,131 | $5.23 | 40 |
| 2015 Q1 | 865,420 | $5,568,911 | +$5,568,908 | $6.43 | 33 |