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 $1.11B 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 $134.81M in its March 31, 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 $123.42M, representing an estimated loss of -8.45% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 47% of the total disclosed AMSC value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Vanguard Portfolio Management 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
246
Total Reported Value
$1.11B
Largest Holder
Blackrock, Inc.
Largest Position
$134.81M
Insider Transactions (90d)
26
Latest Filing Quarter
Q2 2026
New Institutional Positions
96
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% | 3,982,650 | $134,812,704 | $123,422,324 | -$11,390,381 | -8.45% | |
| Vanguard Capital Management Llc | 0.00% | 2,039,468 | $69,035,992 | $63,203,113 | -$5,832,879 | -8.45% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,711,677 | $57,940,266 | $53,044,870 | -$4,895,396 | -8.45% | |
| Baillie Gifford & Co | 0.05% | 1,447,419 | $48,995,134 | $44,855,515 | -$4,139,619 | -8.45% | |
| State Street Corp | 0.00% | 1,261,071 | $42,687,253 | $39,080,590 | -$3,606,663 | -8.45% | |
| Geode Capital Management, Llc | 0.00% | 1,169,152 | $39,583,990 | $36,232,020 | -$3,351,970 | -8.47% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.13% | 1,139,793 | $38,581,993 | $35,322,185 | -$3,259,808 | -8.45% | |
| Nuveen, Llc | 0.01% | 1,020,947 | $34,559,056 | $31,639,148 | -$2,919,908 | -8.45% | |
| Oberweis Asset Management Inc/ | 0.85% | 849,900 | $28,769,115 | $26,338,401 | -$2,430,714 | -8.45% | |
| Awm Investment Company, Inc. | 3.00% | 801,604 | $27,134,295 | $24,841,708 | -$2,292,587 | -8.45% | |
| First Trust Advisors Lp | 0.02% | 778,268 | $26,344,371 | $24,118,525 | -$2,225,846 | -8.45% | |
| Emerald Advisers, Llc | 0.81% | 757,404 | $25,638,125 | $23,471,950 | -$2,166,175 | -8.45% | |
| Goldman Sachs Group Inc | 0.00% | 709,504 | $24,016,711 | $21,987,529 | -$2,029,182 | -8.45% | |
| Dimensional Fund Advisors Lp | 0.00% | 658,297 | $22,277,858 | $20,400,624 | -$1,877,234 | -8.43% | |
| Morgan Stanley | 0.00% | 633,841 | $21,455,567 | $19,642,733 | -$1,812,834 | -8.45% | |
| Telemark Asset Management, Llc | 1.88% | 600,000 | $20,310,000 | $18,594,000 | -$1,716,000 | -8.45% | |
| Ubs Group Ag | 0.00% | 599,821 | $20,303,941 | $18,588,453 | -$1,715,488 | -8.45% | |
| D. E. Shaw & Co., Inc. | 0.02% | 567,574 | $19,212,380 | $17,589,118 | -$1,623,262 | -8.45% | |
| Royce & Associates Lp | 0.18% | 542,778 | $18,373,035 | $16,820,690 | -$1,552,345 | -8.45% | |
| Legal & General Group Plc | 0.00% | 530,131 | $17,944,934 | $16,428,760 | -$1,516,174 | -8.45% | |
| Stephens Investment Management Group Llc | 0.18% | 402,762 | $16,718,651 | $12,481,594 | -$4,237,057 | -25.34% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 446,752 | $15,122,555 | $13,844,844 | -$1,277,711 | -8.45% | |
| Emerald Mutual Fund Advisers Trust | 0.72% | 438,875 | $14,855,919 | $13,600,736 | -$1,255,183 | -8.45% | |
| Bnp Paribas Financial Markets | 0.01% | 436,687 | $14,781,855 | $13,532,930 | -$1,248,925 | -8.45% | |
| Hood River Capital Management Llc | 0.14% | 398,711 | $13,496,367 | $12,356,054 | -$1,140,313 | -8.45% | |
| Northern Trust Corp | 0.00% | 393,224 | $13,310,632 | $12,186,012 | -$1,124,620 | -8.45% | |
| Charles Schwab Investment Management Inc | 0.00% | 385,414 | $13,046,264 | $11,943,980 | -$1,102,284 | -8.45% | |
| Nomura Asset Management International Inc. | 0.02% | 379,483 | $12,845,000 | $11,760,178 | -$1,084,822 | -8.45% | |
| Qube Research & Technologies Ltd | 0.02% | 329,413 | $11,150,630 | $10,208,509 | -$942,121 | -8.45% | |
| Vanguard Fiduciary Trust Co | 0.00% | 326,042 | $11,036,522 | $10,104,042 | -$932,480 | -8.45% | |
| Portolan Capital Management, Llc | 0.53% | 295,636 | $10,007,279 | $9,161,760 | -$845,519 | -8.45% | |
| Panagora Asset Management Inc | 0.03% | 256,392 | $8,678,869 | $7,945,588 | -$733,281 | -8.45% | |
| Invesco Ltd. | 0.00% | 240,792 | $8,150,810 | $7,462,144 | -$688,666 | -8.45% | |
| Essex Investment Management Co Llc | 1.22% | 227,558 | $7,702,838 | $7,052,022 | -$650,816 | -8.45% | |
| Sei Investments Co | 0.01% | 224,436 | $7,597,027 | $6,955,272 | -$641,755 | -8.45% | |
| Citadel Advisors Llc | 0.01% | 216,713 | $7,335,735 | $6,715,936 | -$619,799 | -8.45% | |
| Bank Of America Corp | 0.00% | 209,451 | $7,089,916 | $6,490,886 | -$599,030 | -8.45% | |
| Palisades Investment Partners, Llc | 1.85% | 156,720 | $6,505,611 | $4,856,753 | -$1,648,858 | -25.35% | |
| Aqr Capital Management Llc | 0.00% | 184,755 | $6,253,957 | $5,725,557 | -$528,400 | -8.45% | |
| Two Sigma Investments, Lp | 0.00% | 169,016 | $5,721,192 | $5,237,806 | -$483,386 | -8.45% | |
| Baird Financial Group, Inc. | 0.01% | 163,258 | $5,526,283 | $5,059,365 | -$466,918 | -8.45% | |
| Fmr Llc | 0.00% | 147,293 | $4,985,856 | $4,564,610 | -$421,246 | -8.45% | |
| Allspring Global Investments Holdings, Llc | 0.01% | 149,601 | $4,884,473 | $4,636,135 | -$248,338 | -5.08% | |
| Balyasny Asset Management L.P. | 0.01% | 144,144 | $4,879,275 | $4,467,023 | -$412,252 | -8.45% | |
| Arrowmark Colorado Holdings Llc | 0.12% | 135,432 | $4,584,373 | $4,197,038 | -$387,335 | -8.45% | |
| Bank Of New York Mellon Corp | 0.00% | 134,790 | $4,562,653 | $4,177,142 | -$385,511 | -8.45% | |
| Raymond James Financial Inc | 0.00% | 123,954 | $4,195,842 | $3,841,334 | -$354,508 | -8.45% | |
| Gmt Capital Corp | 0.17% | 108,066 | $3,658,034 | $3,348,965 | -$309,069 | -8.45% | |
| Alps Advisors Inc | 0.02% | 86,387 | $3,585,924 | $2,677,133 | -$908,791 | -25.34% | |
| Millennium Management Llc | 0.00% | 101,576 | $3,438,348 | $3,147,840 | -$290,508 | -8.45% |
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.