The Vanguard Group 13D and 13G filings for American Superconductor Corporation:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2026-01-30 1:29 pm Purchase | 2025-12-31 | 13G | American Superconductor Corporation AMSC | The Vanguard Group | 3,526,632 7.400% | 1,100,354 (+45.35%) | Filing |
| 2024-11-12 1:35 pm Unchanged | 2024-09-30 | 13G | American Superconductor Corporation AMSC | The Vanguard Group | 2,426,278 6.330% | 0 (Unchanged) | Filing |
| 2024-11-04 11:00 am Purchase | 2024-09-30 | 13G | American Superconductor Corporation AMSC | The Vanguard Group | 2,426,278 6.330% | 2,426,278 (New Position) | Filing |