Latest Period
Q1 2026
Security Snapshot
AMERICAN SUPERCONDUCTOR CORP /DE/ - Common Stock (AMSC) Institutional Ownership
CUSIP: 030111207
13F Institutional Holders and Ownership History from Q1 2015 to Q1 2026
Institutions Reporting
241
Shares (Excl. Options)
33,163,406
Price
$33.85
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- Security type / class
- Equity / Common Stock
- Symbol
- AMSC on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 33,163,406
- Total 13F value
- $1,121,919,052
- Portfolio coverage rank
- 0%
- Share change
- -851,897
- Value change
- -$11,999,965
- Number of holders
- 241
- Shares outstanding
- 47,694,720
- SEC-reported price per share
- $55.73
- Insider filing price
- $55.73
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- AMSC - AMERICAN SUPERCONDUCTOR CORP /DE/ - Common Stock is tracked under CUSIP 030111207.
- 241 institutions reported positions in Q1 2026.
- 3 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 238 to 241 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $951,775,692 to $1,121,919,052.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 241 institutions filings for Q1 2026.
Security key
030111207
Latest holder period
Q1 2026
13F holders
241
13D/G owners
3
CIK / CUSIP context first
Open Q1 2026 holders
AMSC full holder history
AMERICAN SUPERCONDUCTOR CORP /DE/ SEC filings
AMERICAN SUPERCONDUCTOR CORP /DE/ company facts
AMERICAN SUPERCONDUCTOR CORP /DE/ insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 030111207:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
3
Security
AMSC
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 7.1% | -18% | $56,355,183 | -$12,648,303 | 2,799,562 | -18% | BlackRock, Inc. | 31 Mar 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC | 5% | $80,723,314 | 2,384,736 | Vanguard Capital Management | 31 Mar 2026 | |||
| BAILLIE GIFFORD & CO | 4.2% | -22% | $33,210,273 | -$9,191,459 | 1,649,790 | -22% | BAILLIE GIFFORD & CO | 31 Dec 2024 |
As of 31 Mar 2026, 241 institutional investors reported holding 33,163,406 shares of AMERICAN SUPERCONDUCTOR CORP /DE/ - Common Stock (AMSC). This represents 70% of the company’s total 47,694,720 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
50%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 8.4% | 3,982,650 | +6.2% | 0% | $134,812,704 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.3% | 2,039,468 | 0% | 0% | $69,035,992 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.6% | 1,711,677 | 0% | 0% | $57,940,266 |
| BAILLIE GIFFORD & CO | 3% | 1,447,419 | -3.9% | 0.05% | $48,995,134 |
| STATE STREET CORP | 2.6% | 1,261,071 | +5.8% | 0% | $42,687,253 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.5% | 1,169,152 | +7.2% | 0% | $39,583,990 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | 2.4% | 1,139,793 | 0.13% | $38,581,993 | |
| Nuveen, LLC | 2.1% | 1,020,947 | +6.2% | 0.01% | $34,559,056 |
| OBERWEIS ASSET MANAGEMENT INC/ | 1.8% | 849,900 | +1.7% | 0.85% | $28,769,115 |
| AWM Investment Company, Inc. | 1.7% | 801,604 | +6.3% | 3% | $27,134,295 |
| FIRST TRUST ADVISORS LP | 1.6% | 778,268 | +14% | 0.02% | $26,344,371 |
| EMERALD ADVISERS, LLC | 1.6% | 757,404 | -0.02% | 0.81% | $25,638,125 |
| GOLDMAN SACHS GROUP INC | 1.5% | 709,504 | -9.3% | 0% | $24,016,711 |
| DIMENSIONAL FUND ADVISORS LP | 1.4% | 658,297 | +22% | 0% | $22,277,858 |
| MORGAN STANLEY | 1.3% | 633,840 | -10% | 0% | $21,455,504 |
| Telemark Asset Management, LLC | 1.3% | 600,000 | -3.2% | 1.9% | $20,310,000 |
| UBS Group AG | 1.3% | 599,821 | -19% | 0% | $20,303,941 |
| D. E. Shaw & Co., Inc. | 1.2% | 567,574 | +28% | 0.02% | $19,212,380 |
| ROYCE & ASSOCIATES LP | 1.1% | 542,778 | +40% | 0.18% | $18,373,035 |
| Legal & General Group Plc | 1.1% | 530,131 | +91% | 0% | $17,944,934 |
| ALGERT GLOBAL LLC | 1% | 489,971 | +6.3% | 0.25% | $16,586,000 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 0.94% | 446,752 | -35% | 0.01% | $15,122,555 |
| EMERALD MUTUAL FUND ADVISERS TRUST | 0.92% | 438,875 | +0.83% | 0.72% | $14,855,919 |
| BNP PARIBAS FINANCIAL MARKETS | 0.92% | 436,687 | 0% | 0.01% | $14,781,855 |
| Hood River Capital Management LLC | 0.84% | 398,711 | 0.14% | $13,496,367 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
45
Latest
Q1 2026
Rows shown
1-25 of 45
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 33,163,406 | $1,121,919,052 | -$11,999,965 | $33.85 | 241 |
| 2025 Q4 | 33,048,995 | $951,775,692 | -$100,425,515 | $28.78 | 238 |
| 2025 Q3 | 32,698,988 | $1,940,981,155 | +$32,935,326 | $59.39 | 270 |
| 2025 Q2 | 32,674,926 | $1,198,934,947 | +$198,037,144 | $36.69 | 228 |
| 2025 Q1 | 27,561,821 | $500,035,162 | -$3,552,043 | $18.14 | 189 |
| 2024 Q4 | 27,521,153 | $678,105,741 | +$7,292,176 | $24.63 | 190 |
| 2024 Q3 | 27,198,756 | $641,943,684 | -$3,178,845 | $23.60 | 170 |
| 2024 Q2 | 27,193,223 | $636,078,474 | +$100,747,508 | $23.39 | 154 |
| 2024 Q1 | 23,096,288 | $312,018,202 | +$95,933,897 | $13.51 | 127 |
| 2023 Q4 | 16,047,561 | $178,757,920 | +$32,158,997 | $11.14 | 98 |
| 2023 Q3 | 13,211,392 | $99,745,426 | +$1,953,457 | $7.55 | 71 |
| 2023 Q2 | 13,090,639 | $81,943,982 | -$222,130 | $6.26 | 75 |
| 2023 Q1 | 13,147,722 | $64,556,424 | +$440,557 | $4.91 | 73 |
| 2022 Q4 | 13,144,355 | $48,365,833 | -$3,622,597 | $3.68 | 74 |
| 2022 Q3 | 13,931,654 | $61,023,588 | +$2,317,476 | $4.38 | 74 |
| 2022 Q2 | 13,250,274 | $68,637,400 | -$15,464,888 | $5.18 | 81 |
| 2022 Q1 | 15,674,969 | $119,452,725 | -$11,388,520 | $7.61 | 96 |
| 2021 Q4 | 16,381,893 | $178,146,496 | -$7,328,930 | $10.88 | 99 |
| 2021 Q3 | 16,697,055 | $242,925,738 | +$3,477,984 | $14.58 | 93 |
| 2021 Q2 | 16,351,935 | $284,837,911 | +$433,500 | $17.39 | 96 |
| 2021 Q1 | 16,184,271 | $306,573,897 | -$32,714,323 | $18.96 | 99 |
| 2020 Q4 | 17,342,165 | $405,527,098 | +$91,556,015 | $23.42 | 101 |
| 2020 Q3 | 13,877,546 | $201,594,232 | +$35,621,311 | $14.48 | 83 |
| 2020 Q2 | 11,598,459 | $94,116,585 | +$5,240,209 | $8.13 | 71 |
| 2020 Q1 | 10,971,893 | $59,960,136 | +$1,361,714 | $5.48 | 68 |