AMSC
American Superconductor Corporation · Industrials · Electrical Equipment & Parts
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +0.1% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 96 | +4 | 22.82M | $946.45M | +10 | −8 |
| Q1 2026 | 97 | +2 | 21.85M | $738.85M | +12 | −10 |
| Q4 2025 | 95 | -1 | 24.00M | $691.45M | — | −1 |
| Q3 2025 | 19 | +1 | 15.15M | $899.55M | +1 | — |
| Q2 2025 | 15 | +1 | 11.40M | $418.12M | +1 | — |
| Q1 2025 | 11 | 0 | 4.33M | $78.61M | +1 | −1 |
| Q4 2024 | 11 | 0 | 5.01M | $123.30M | +2 | −2 |
| Q3 2024 | 10 | 0 | 4.09M | $96.55M | +2 | −2 |
| Q2 2024 | 10 | — | 4.75M | $111.12M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Baillie Gifford ✦ | 1.65M | -21.7% | $40.63M | 0.0% | ▼ Trim | 3 | SEC ↗ ×4 |
| 2 | State Street Global Advisors ✦ (passive) | 909.29K | — | $22.40M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 856.46K | +1.1% | $21.10M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 4 | Wellington Management ✦ | 461.23K | New | $11.36M | 0.0% | New | 1 | SEC ↗ ×3 |
| 5 | Arrowstreet Capital ✦ | 296.79K | New | $7.31M | 0.0% | New | 1 | SEC ↗ |
| 6 | Citadel Advisors ✦ | 259.84K | -12.2% | $6.40M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 7 | AQR Capital Management ✦ | 256.23K | +143.5% | $6.31M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 8 | D. E. Shaw & Co. ✦ | 252.21K | -0.5% | $6.21M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 9 | Millennium Management ✦ | 23.07K | -91.2% | $568,091 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 10 | T. Rowe Price ✦ | 22.60K | +10.4% | $557,000 | 0.0% | ▲ Add | 3 | SEC ↗ |
| 11 | Two Sigma Investments ✦ | 18.22K | -3.3% | $448,808 | 0.0% | ▼ Trim | 3 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Wellington Management | $11.36M | 0.0% |
| Arrowstreet Capital | $7.31M | 0.0% |
Exited
| Renaissance Technologies | $3.74M | was 0.0% |
| Gotham Asset Management | $533,100 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 240 holders, 33.03M shares, $1.09B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.