American Superconductor Corporation (AMSC) Institutional Ownership & Insider Trading

278 institutions reported holding American Superconductor Corporation shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 25 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

AMSCAmerican Superconductor CorporationFollow AMSC — free

Specialty Industrial Machinery · Industrials

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Market cap: 1.2B
P/E TTM: —
Dividend yield: —
52-week: —
Next earnings: 4 Nov, in 11 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

278 institutions held 73.1% of the shares. Across filers that reported both quarters, shares held changed +6.9%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	278	35	+6.9%	104	62	70	26
Mar 26	241	33	-2.0%	91	44	54	40
Dec 25	234	33	-0.5%	100	33	60	66
Sep 25	268	33	+0.6%	81	65	75	23
Jun 25	231	33	+17.9%	89	64	50	22
Mar 25	189	28	+0.4%	54	34	60	34
Dec 24	189	27	+0.5%	56	45	50	28
Sep 24	169	27	-3.6%	46	43	48	26

American Superconductor Corporation — questions

Who owns American Superconductor Corporation stock?: 278 institutions reported American Superconductor Corporation shares in 13F filings for the quarter ended 2026-06-30. The largest: BlackRock, Inc. (8.4%), VANGUARD CAPITAL MANAGEMENT LLC (4.2%), BARROW HANLEY MEWHINNEY & STRAUSS LLC (3.5%).
Are American Superconductor Corporation insiders buying or selling?: 25 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from American Superconductor Corporation's own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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