AMERICAN SUPERCONDUCTOR CORP (AMSC) Institutional Shareholders
AMERICAN SUPERCONDUCTOR CORP (AMSC) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $1.46B in AMSC holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of AMSC tracked by InsiderSet, reporting ownership valued at approximately $170.00M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $123.64M, representing an estimated loss of -27.27% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 48% of the total disclosed AMSC value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Barrow Hanley Mewhinney & Strauss Llc, and several other long-term asset managers with concentrated positions in AMERICAN SUPERCONDUCTOR CORP (AMSC).
This page ranks the largest institutional AMSC shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
266
Total Reported Value
$1.46B
Largest Holder
Blackrock, Inc.
Largest Position
$170.00M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
70
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 4,095,371 | $169,998,850 | $123,639,250 | -$46,359,600 | -27.27% | |
| Vanguard Capital Management Llc | 0.00% | 2,034,219 | $84,440,431 | $61,413,072 | -$23,027,359 | -27.27% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.21% | 1,704,006 | $70,733,289 | $51,443,941 | -$19,289,348 | -27.27% | |
| Ubs Group Ag | 0.01% | 1,429,090 | $59,321,525 | $43,144,227 | -$16,177,298 | -27.27% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,418,863 | $58,897,003 | $42,835,474 | -$16,061,529 | -27.27% | |
| State Street Corp | 0.00% | 1,358,225 | $56,379,920 | $41,004,813 | -$15,375,107 | -27.27% | |
| Goldman Sachs Group Inc | 0.01% | 1,294,047 | $53,715,891 | $39,067,279 | -$14,648,612 | -27.27% | |
| Geode Capital Management, Llc | 0.00% | 1,243,198 | $51,615,468 | $37,532,148 | -$14,083,320 | -27.29% | |
| First Trust Advisors Lp | 0.03% | 1,168,424 | $48,501,280 | $35,274,721 | -$13,226,559 | -27.27% | |
| Oberweis Asset Management Inc/ | 0.85% | 987,500 | $40,991,125 | $29,812,625 | -$11,178,500 | -27.27% | |
| Awm Investment Company, Inc. | 3.43% | 951,604 | $39,501,082 | $28,728,925 | -$10,772,157 | -27.27% | |
| Baillie Gifford & Co | 0.04% | 933,308 | $38,741,615 | $28,176,569 | -$10,565,046 | -27.27% | |
| Emerald Advisers, Llc | 0.82% | 843,956 | $35,032,614 | $25,479,032 | -$9,553,582 | -27.27% | |
| Legal & General Group Plc | 0.01% | 756,863 | $31,417,382 | $22,849,694 | -$8,567,688 | -27.27% | |
| Dimensional Fund Advisors Lp | 0.00% | 645,991 | $26,809,456 | $19,502,468 | -$7,306,988 | -27.26% | |
| Morgan Stanley | 0.00% | 635,833 | $26,393,466 | $19,195,798 | -$7,197,668 | -27.27% | |
| Nuveen, Llc | 0.01% | 628,406 | $26,085,133 | $18,971,577 | -$7,113,556 | -27.27% | |
| Telemark Asset Management, Llc | 1.80% | 600,000 | $24,906,000 | $18,114,000 | -$6,792,000 | -27.27% | |
| Royce & Associates Lp | 0.19% | 555,821 | $23,072,130 | $16,780,236 | -$6,291,894 | -27.27% | |
| Emerald Mutual Fund Advisers Trust | 0.79% | 538,955 | $22,372,022 | $16,271,051 | -$6,100,971 | -27.27% | |
| Northern Trust Corp | 0.00% | 433,792 | $18,006,706 | $13,096,180 | -$4,910,526 | -27.27% | |
| Ranger Investment Management, L.P. | 1.06% | 405,266 | $16,822,592 | $12,234,981 | -$4,587,611 | -27.27% | |
| Stephens Investment Management Group Llc | 0.18% | 402,762 | $16,718,651 | $12,159,385 | -$4,559,266 | -27.27% | |
| Charles Schwab Investment Management Inc | 0.00% | 399,125 | $16,567,679 | $12,049,584 | -$4,518,095 | -27.27% | |
| Panagora Asset Management Inc | 0.05% | 375,515 | $15,587,628 | $11,336,798 | -$4,250,830 | -27.27% | |
| D. E. Shaw & Co., Inc. | 0.01% | 366,845 | $15,227,736 | $11,075,051 | -$4,152,685 | -27.27% | |
| Bnp Paribas Financial Markets | 0.01% | 366,437 | $15,210,800 | $11,062,733 | -$4,148,067 | -27.27% | |
| Algert Global Llc | 0.17% | 353,832 | $14,687,566 | $10,682,188 | -$4,005,378 | -27.27% | |
| Price T Rowe Associates Inc | 0.00% | 343,867 | $14,274,000 | $10,381,345 | -$3,892,655 | -27.27% | |
| Vanguard Fiduciary Trust Co | 0.00% | 337,929 | $14,027,433 | $10,202,077 | -$3,825,356 | -27.27% | |
| T. Rowe Price Investment Management, Inc. | 0.01% | 306,182 | $12,710,000 | $9,243,635 | -$3,466,365 | -27.27% | |
| Hrt Financial Lp | 0.02% | 298,420 | $12,387,000 | $9,009,300 | -$3,377,700 | -27.27% | |
| Qube Research & Technologies Ltd | 0.01% | 250,573 | $10,401,285 | $7,564,799 | -$2,836,486 | -27.27% | |
| Susquehanna International Group, Llp | 0.01% | 235,235 | $9,764,605 | $7,101,745 | -$2,662,860 | -27.27% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 230,903 | $9,584,784 | $6,970,962 | -$2,613,822 | -27.27% | |
| Essex Investment Management Co Llc | 1.21% | 221,933 | $9,212,439 | $6,700,157 | -$2,512,282 | -27.27% | |
| Aqr Capital Management Llc | 0.00% | 194,477 | $8,072,740 | $5,871,261 | -$2,201,479 | -27.27% | |
| Invesco Ltd. | 0.00% | 180,660 | $7,499,197 | $5,454,125 | -$2,045,072 | -27.27% | |
| Russell Investments Group, Ltd. | 0.01% | 171,764 | $7,129,984 | $5,185,555 | -$1,944,429 | -27.27% | |
| Jane Street Group, Llc | 0.00% | 170,319 | $7,069,942 | $5,141,931 | -$1,928,011 | -27.27% | |
| Mackenzie Financial Corp | 0.01% | 164,450 | $6,826,319 | $4,964,746 | -$1,861,574 | -27.27% | |
| Arrowmark Colorado Holdings Llc | 0.28% | 159,432 | $6,618,022 | $4,813,252 | -$1,804,770 | -27.27% | |
| Baird Financial Group, Inc. | 0.01% | 157,203 | $6,525,497 | $4,745,959 | -$1,779,538 | -27.27% | |
| Palisades Investment Partners, Llc | 1.85% | 156,720 | $6,505,611 | $4,731,377 | -$1,774,234 | -27.27% | |
| Jpmorgan Chase & Co | 0.00% | 149,502 | $6,040,140 | $4,513,465 | -$1,526,675 | -25.28% | |
| Bank Of New York Mellon Corp | 0.00% | 143,968 | $5,976,092 | $4,346,394 | -$1,629,698 | -27.27% | |
| Allspring Global Investments Holdings, Llc | 0.01% | 130,622 | $5,214,430 | $3,943,478 | -$1,270,952 | -24.37% | |
| Raymond James Financial Inc | 0.00% | 118,801 | $4,931,429 | $3,586,602 | -$1,344,827 | -27.27% | |
| Ameriprise Financial Inc | 0.00% | 111,856 | $4,643,143 | $3,376,933 | -$1,266,210 | -27.27% | |
| Gmt Capital Corp | 0.23% | 108,066 | $4,485,820 | $3,262,513 | -$1,223,307 | -27.27% |
Frequently asked questions about AMSC
Who owns the most AMSC stock?
The largest holders of AMSC are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for AMERICAN SUPERCONDUCTOR CORP (AMSC).
Is AMSC widely held by superinvestors?
Many widely followed stocks like AMSC appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly AMSC is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.