American Superconductor Corp (AMSC): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in AMSC · Industrials. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
14
13F filers
Aggregate Value
$106.9M
Across holders
Last Price
$28.92
2026-08-24
Sector
Industrials
GICS
Quarterly fund activity5 increased9 reduced2 exited
Full exits: AXIOM INVESTORS LLC /DE, Walleye Capital LLC
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| BAILLIE GIFFORD & CO CIK 0001088875 | Institutional Manager | 933K | $38.7M | 36.2% | 0.0% | Reduced | $-21.8M | Q2 2026 |
| SHAW D E & CO INC CIK 0001009207 | Hedge Fund | 367K | $15.2M | 14.2% | 0.0% | Reduced | +$14.6M | Q2 2026 |
| Qube Research & Technologies Ltd CIK 0001729829 | Hedge Fund | 251K | $10.4M | 9.7% | 0.0% | Reduced | $-3.3M | Q2 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 0001164508 | Hedge Fund | 231K | $9.6M | 9.0% | 0.0% | Reduced | $-9.0M | Q2 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 194K | $8.1M | 7.6% | 0.0% | Added | +$7.6M | Q2 2026 |
| ArrowMark Colorado Holdings LLC CIK 0001483859 | Hedge Fund | 159K | $6.6M | 6.2% | 0.3% | Added | +$996K | Q2 2026 |
| MILLENNIUM MANAGEMENT LLC CIK 0001273087 | Hedge Fund | 101K | $4.2M | 3.9% | 0.0% | Reduced | $-34K | Q2 2026 |
| Holocene Advisors, LP CIK 0001700574 | Hedge Fund | 96K | $4.0M | 3.7% | 0.0% | Added | +$3.5M | Q2 2026 |
| TWO SIGMA INVESTMENTS, LP CIK 0001179392 | Hedge Fund | 90K | $3.8M | 3.5% | 0.0% | Reduced | +$3.3M | Q2 2026 |
| BALYASNY ASSET MANAGEMENT LLC CIK 0001218710 | Hedge Fund | 69K | $2.9M | 2.7% | 0.0% | Reduced | +$2.8M | Q2 2026 |
Reduced
Institutional Manager
$38.7M· 36.2% of total· 0.0% port· 933K sh· $-21.8M QoQ· Q2 2026
Reduced
Hedge Fund
$15.2M· 14.2% of total· 0.0% port· 367K sh· +$14.6M QoQ· Q2 2026
Reduced
Hedge Fund
$10.4M· 9.7% of total· 0.0% port· 251K sh· $-3.3M QoQ· Q2 2026
Reduced
Hedge Fund
$9.6M· 9.0% of total· 0.0% port· 231K sh· $-9.0M QoQ· Q2 2026
Added
Hedge Fund
$8.1M· 7.6% of total· 0.0% port· 194K sh· +$7.6M QoQ· Q2 2026
Added
Hedge Fund
$6.6M· 6.2% of total· 0.3% port· 159K sh· +$996K QoQ· Q2 2026
Reduced
Hedge Fund
$4.2M· 3.9% of total· 0.0% port· 101K sh· $-34K QoQ· Q2 2026
Added
Hedge Fund
$4.0M· 3.7% of total· 0.0% port· 96K sh· +$3.5M QoQ· Q2 2026
Reduced
Hedge Fund
$3.8M· 3.5% of total· 0.0% port· 90K sh· +$3.3M QoQ· Q2 2026
Reduced
Hedge Fund
$2.9M· 2.7% of total· 0.0% port· 69K sh· +$2.8M QoQ· Q2 2026
Added
Hedge Fund
$2.2M· 2.1% of total· 0.0% port· 53K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$852K· 0.8% of total· 0.0% port· 21K sh· $-6.2M QoQ· Q2 2026
Added
Hedge Fund
$346K· 0.3% of total· 0.0% port· 8K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$65K· 0.1% of total· 0.0% port· 2K sh· $-706 QoQ· Q2 2026
1–10 of 14
1 / 2
Loading recent insider activity…