$AMSC

$25.40 +$0.28 (1.11%) Close

$AMSC Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 48.4M shares outstanding

Who owns AMSC?

By type of holder

Institutions 73.3% Insiders 3.5% Everyone else 23.2%

Concentration Top 10 holders own 34.4%

BlackRock, Inc. 8.5% · Vanguard Capital Management LLC 4.2%

Institutional ownership

73.3%

+4.0 pts vs last qtr

Institutional holders

277

+31 vs last qtr

Net shares bought

+1.9M

by institutions in Q2 2026

New / sold out

66 / 35

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

UBS Group AG +829.3K
Goldman Sachs Group Inc +584.5K

Biggest sellers in Q2 2026

Baillie Gifford & Co −514.1K
Hood River Capital Management LLC SOLD OUT −398.7K

Who is planning to sell?

Notices of proposed sale, last 12 months

$7.8M

9 notices from 3 people

Shares covered

163.7K

0.34% of the company

Arranged in advance

98%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Daniel Mcgahn Officer 10b5-1 $5.32M
John Kosiba Officer 10b5-1 $2.32M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2017–FY2026

+218.0%

+13.72% a year

Each share's claim on the business

−68.6%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$126K vs $48.8M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years52% 3–5 years4% 1–3 years28% Under 1 year16%

Quarterly turnover

17.1%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting AMSC on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	4.1M	8.45%	+112.7K (+2.8%)	≤2021	0.0%
Shares held by quarter Peak holding4.1M (Q2'26) Change over 8 quarters+1.4M Share of the company8.450% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	2.0M	4.20%	−5.2K (−0.3%)	≤2021	0.0%
Shares held by quarter Peak holding2.0M (Q1'26) Change over 8 quarters+2.0M Share of the company4.200% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

4.1M

% of company

8.45%

Change vs last qtr

+112.7K (+2.8%)

Held since

≤2021

Vanguard Capital Management LLC

2.0M

% of company

4.20%

Change vs last qtr

−5.2K (−0.3%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding American Superconductor Corp, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting AMSC on Form N-PORT; together they hold 31.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$59.8M	1.4M	2.97%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$50.8M	1.2M	2.52%	0.06%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$59.8M

% of company

2.97%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$50.8M

% of company

2.52%

% of the fund

0.06%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding American Superconductor Corp and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MD McGahn Daniel P Insider	1.2M	2.38%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company2.380% McGahn Daniel P's insider activity →
KJ Kosiba John W JR Insider	342.9K	0.71%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.710% Kosiba John W JR's insider activity →

McGahn Daniel P

Insider

1.2M

% of company

2.38%

Change vs last qtr

—

Held since

—

Kosiba John W JR

Insider

342.9K

% of company

0.71%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of American Superconductor Corp.

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