Who owns American Superconductor (AMSC)
Which tracked institutional funds hold AMSC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMSC company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
93 tracked funds added or opened AMSC while 39 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
AMSC’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes AMSC more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AMSC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 269 tracked filers holding AMSC, 168 increased or opened the position and 118 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in AMSC between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 17
- Ranger Investment Management, L.P.$17M
- JANE STREET GROUP, LLC$7M
- SILVERCREST ASSET MANAGEMENT GROUP LLC$4M
- WELLINGTON MANAGEMENT GROUP LLP$4M
- BROWN CAPITAL MANAGEMENT LLC$3M
- MARSHALL WACE, LLP$2M
Full exits 18
- Hood River Capital Management LLC$13M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$13M
- Point72 Asset Management, L.P.$5M
- AXIOM INVESTORS LLC /DE$3M
- Maxi Investments CY Ltd$3M
- KENNEDY CAPITAL MANAGEMENT LLC$2M
Largest adds
- UBS Group AG$39M
- BlackRock, Inc.$35M
- BARROW HANLEY MEWHINNEY & STRAUSS LLC$32M
- GOLDMAN SACHS GROUP INC$30M
- FIRST TRUST ADVISORS LP$22M
- VANGUARD CAPITAL MANAGEMENT LLC$15M
Largest trims
- BAILLIE GIFFORD & CO$10M
- Portolan Capital Management, LLC$9M
- Nuveen, LLC$8M
- CITADEL ADVISORS LLC$6M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$6M
- FMR LLC$5M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 4,095,371 | $170M | 12.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 2,034,219 | $84M | 6.1% | 2026-Q2 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC added | 1,704,006 | $71M | 5.1% | 2026-Q2 |
| UBS Group AG added | 1,429,090 | $59M | 4.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 1,418,863 | $59M | 4.2% | 2026-Q2 |
| STATE STREET CORP added | 1,358,225 | $56M | 4.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,294,047 | $54M | 3.9% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,243,198 | $52M | 3.7% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 1,168,424 | $49M | 3.5% | 2026-Q2 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 987,500 | $41M | 2.9% | 2026-Q2 |
| AWM Investment Company, Inc. added | 951,604 | $40M | 2.8% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 933,308 | $39M | 2.8% | 2026-Q2 |
| EMERALD ADVISERS, LLC added | 843,956 | $35M | 2.5% | 2026-Q2 |
| Legal & General Group Plc added | 756,863 | $31M | 2.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 645,991 | $27M | 1.9% | 2026-Q2 |
| MORGAN STANLEY added | 635,833 | $26M | 1.9% | 2026-Q2 |
| Nuveen, LLC trimmed | 628,406 | $26M | 1.9% | 2026-Q2 |
| Telemark Asset Management, LLC | 600,000 | $25M | 1.8% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 555,821 | $23M | 1.7% | 2026-Q2 |
| EMERALD MUTUAL FUND ADVISERS TRUST added | 538,955 | $22M | 1.6% | 2026-Q2 |
| NORTHERN TRUST CORP added | 433,792 | $18M | 1.3% | 2026-Q2 |
| Ranger Investment Management, L.P. new | 405,266 | $17M | 1.2% | 2026-Q2 |
| Stephens Investment Management Group LLC added | 402,762 | $17M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 399,125 | $17M | 1.2% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 375,515 | $16M | 1.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 366,845 | $15M | 1.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 366,437 | $15M | 1.1% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 353,832 | $15M | 1.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 343,867 | $14M | 1.0% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 337,929 | $14M | 1.0% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 250,573 | $10M | 0.7% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 235,235 | $10M | 0.7% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 230,903 | $10M | 0.7% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 221,933 | $9M | 0.7% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 194,477 | $8M | 0.6% | 2026-Q2 |
| Invesco Ltd. trimmed | 180,660 | $7M | 0.5% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 171,764 | $7M | 0.5% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 170,319 | $7M | 0.5% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 164,450 | $7M | 0.5% | 2026-Q2 |
| ArrowMark Colorado Holdings LLC added | 159,432 | $7M | 0.5% | 2026-Q2 |
| Baird Financial Group, Inc. trimmed | 157,203 | $7M | 0.5% | 2026-Q2 |
| Palisades Investment Partners, LLC added | 156,720 | $7M | 0.5% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 149,502 | $6M | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 143,968 | $6M | 0.4% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC trimmed | 130,622 | $5M | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 118,801 | $5M | 0.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 111,856 | $5M | 0.3% | 2026-Q2 |
| GMT Capital Corp | 108,066 | $4M | 0.3% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 106,216 | $4M | 0.3% | 2026-Q2 |
| Tidal Investments LLC added | 101,341 | $4M | 0.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 100,762 | $4M | 0.3% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC new | 100,026 | $4M | 0.3% | 2026-Q2 |
| Defiance ETFs, LLC added | 99,395 | $4M | 0.3% | 2026-Q2 |
| Holocene Advisors, LP added | 95,716 | $4M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 91,267 | $4M | 0.3% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 90,340 | $4M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 88,600 | $4M | 0.3% | 2026-Q2 |
| ALPS ADVISORS INC trimmed | 86,387 | $4M | 0.3% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 85,244 | $4M | 0.3% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 85,215 | $4M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 83,306 | $3M | 0.2% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 78,620 | $3M | 0.2% | 2026-Q2 |
| Lumbard & Kellner, LLC added | 74,139 | $3M | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 72,900 | $3M | 0.2% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 68,847 | $3M | 0.2% | 2026-Q2 |
| BROWN CAPITAL MANAGEMENT LLC new | 68,156 | $3M | 0.2% | 2026-Q2 |
| CAMPBELL NEWMAN ASSET MANAGEMENT INC added | 67,337 | $3M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 63,572 | $3M | 0.2% | 2026-Q2 |
| LPL Financial LLC trimmed | 57,385 | $2M | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 54,720 | $2M | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP new | 53,261 | $2M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 51,992 | $2M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 50,888 | $2M | 0.2% | 2026-Q2 |
| Hennion & Walsh Asset Management, Inc. added | 46,020 | $2M | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 42,728 | $2M | 0.1% | 2026-Q2 |
| Legato Capital Management LLC added | 41,369 | $2M | 0.1% | 2026-Q2 |
| NISSAY ASSET MANAGEMENT CORP /JAPAN added | 37,914 | $2M | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd trimmed | 37,682 | $2M | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 35,656 | $1M | 0.1% | 2026-Q2 |
| Merit Financial Group, LLC trimmed | 35,471 | $1M | 0.1% | 2026-Q2 |
| Polymer Capital Management (US) LLC new | 34,521 | $1M | 0.1% | 2026-Q2 |
| Quantum Private Wealth, LLC added | 33,823 | $1M | 0.1% | 2026-Q2 |
| Focus Partners Wealth added | 33,671 | $1M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 33,360 | $1M | 0.1% | 2026-Q2 |
| TRUIST FINANCIAL CORP | 32,700 | $1M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 32,598 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 32,589 | $1M | 0.1% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 32,145 | $1M | 0.1% | 2026-Q2 |
| Aquatic Capital Management LLC trimmed | 32,081 | $1M | 0.1% | 2026-Q2 |
| KORNITZER CAPITAL MANAGEMENT INC /KS trimmed | 31,669 | $1M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 30,848 | $1M | 0.1% | 2026-Q2 |
| OPPENHEIMER & CO INC added | 30,060 | $1M | 0.1% | 2026-Q2 |
| Portolan Capital Management, LLC trimmed | 29,314 | $1M | 0.1% | 2026-Q2 |
| VIRTUS ADVISERS, LLC added | 28,501 | $1M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 27,526 | $1M | 0.1% | 2026-Q2 |
| Round Rock Advisors LLC added | 26,431 | $1M | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 24,343 | $1M | 0.1% | 2026-Q2 |
| DIVERSIFIED TRUST CO added | 23,878 | $991K | 0.1% | 2026-Q2 |
| State of New Jersey Common Pension Fund D new | 21,666 | $899K | 0.1% | 2026-Q2 |
| Dorsey & Whitney Trust CO LLC | 21,611 | $897K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.