Companies / American Superconductor Corp /De/
American Superconductor Corp /De/
Nasdaq: AMSCCIK 880807DEVENS, MA
Financials · FY2017
Ownership
48.4M shares outstanding · as of Jul 31, 2026
Ownership
| Insiders | 0.13% | 63,823 |
| 10%+ / strategic | 7.28% | 3,526,632 |
| Institutions | 64.27% | 31,135,624 |
| Public float | 28.31% | 13,716,064 |
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 1
View all →| Insider | % of shares | Shares |
|---|---|---|
Oliver David R JrDirector | 0.13% | 63,823 |
Institutional holders 253
View all →| Holder | Value | % of shares |
|---|---|---|
| $170.00M | 8.45% | |
| $101.50M | 7.28% | |
| $56.38M | 2.80% | |
| $49.00M | 2.99% | |
| $39.58M | 2.41% | |
| $30.05M | 2.16% | |
| $27.66M | 1.98% | |
| $26.34M | 1.61% | |
| $25.64M | 1.56% | |
| $24.06M | 1.73% |
Activity
Jun 30, 2026View all →
InsidersInstitutions
Who's accumulating and trimming this stock (13F).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q2 2026 as of | BlackRock, Inc. 13F manager | Add | Common stock | $14.32M | +345K +9.20% | 4,095,371 8.45% of shares | medium |
| Q1 2026 as of | BNP Paribas Financial Markets 13F manager | Add | Common stock | $11.99M | +354K +429.30% | 436,687 0.90% of shares | medium |
| Q1 2026 as of | Portolan Capital Management, LLC 13F manager | New | Common stock | $10.01M | +296K | 295,636 0.61% of shares | medium |
| Q1 2026 as of | Arrowstreet Capital, Limited Partnership 13F manager | Trim | Common stock | $-8.00M | -236K -34.61% | 446,752 0.92% of shares | medium |
| Q2 2026 as of | State Street Corporation 13F manager | Add | Common stock | $6.90M | +166K +13.94% | 1,358,225 2.80% of shares | medium |
| Q1 2026 as of | Two Sigma Investments, LP 13F manager | Trim | Common stock | $-5.16M | -153K -47.44% | 169,016 0.35% of shares | medium |
| Q1 2026 as of | Stephens Investment Management Group LLC 13F manager | Add | Common stock | $4.55M | +134K +77.08% | 308,515 0.64% of shares | low |
| Q1 2026 as of | D. E. Shaw & Co., Inc. 13F manager | Add | Common stock | $4.21M | +124K +28.08% | 567,574 1.17% of shares | low |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Vanguard Group Inc | Passive13G/A | — |
| Vanguard Group Inc | Passive13G/A | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| AMSC | — | 030111207 |