As of November 6, 2026, American Superconductor Corp is a publicly traded company (Nasdaq: AMSC). The largest insider holding is Daniel P. McGahn, the chairman and chief executive, with 1,145,273 shares (2.4% of shares outstanding), per Form 4 of June 11, 2026. No bankruptcy or receivership appears in its SEC Form 8-K filings (Schedule 13G, April 29, 2026).
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Is American Superconductor Corp a real, registered company?
- American Superconductor Corp files with the SEC under CIK 880807 (its SEC filings).
- Its shares are listed under the ticker AMSC on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in Devens, Massachusetts, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under American Superconductor Corp in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Vanguard (filed 2026-04-29).
Who are American Superconductor Corp's owners and officers?
American Superconductor Corp: incorporated in Delaware; business address in Devens, Massachusetts; industry Motors & Generators (Schedule 13G/A, 2026-07-31).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-07-31 | Vanguard Capital Management | 4.93% |
| Schedule 13G, 2026-04-29 | Vanguard Capital Management | 5% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13G/A, 2026-01-30 | The Vanguard Group | 7.4% |
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The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
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Which insiders own American Superconductor Corp shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chairman and chief executive: 1,145,273 shares (2.4% of shares outstanding), 1,131,929 held directly and 13,344 indirectly (Form 4, 2026-06-11).
- , the chief financial officer and senior vice president: 334,748 shares (0.69% of shares outstanding), 334,377 held directly and 371 indirectly (Form 4, 2026-06-11).
- , a director: 63,823 shares (0.13% of shares outstanding) (Form 4, 2026-04-07).
- , a director: 51,779 shares (0.11% of shares outstanding) (Form 4, 2026-04-07).
- , a director: 37,034 shares (0.08% of shares outstanding) (Form 4, 2026-09-21).
Shares outstanding: 48,455,057 as of 2026-10-30, from the company's latest SEC cover page.
How much has American Superconductor Corp raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2025-12-10).
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Companies that share a holder
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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