American Superconductor AMSC Institutional Ownership

NASDAQ AMSC

$28.66 -0.65 (-2.22%)

At close: Sep 10, 2026 · 4:00 PM EDT

Institutions by Trading Activity

277 Institutions

Increased 174 62.8%

Unchanged 26 9.4%

Reduced 77 27.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

77.91%

▲+5.52 pp QoQ

Shares Held by Institutions

35.74Mn

of 45.87Mn outstanding

▲+12.76% QoQ

Shares Outstanding

45.87Mn

10.13Mn held outside 13F filers

Institutional Investors

277

filed 13F for Jun 2026

▲+34 vs prior quarter

Net Shares Added (QoQ)

+4.04Mn

accumulated since last quarter

Value of Holdings

$1.06Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

American Superconductor Corp /De/ (NASDAQ:AMSC) is held by 277 institutional investors per 13F filings through June 2026.

These investors held 77.9% of outstanding shares in June 2026, up from 72.4% in March 2026.
Their total shares held in AMSC increased 12.76% from the prior quarter, while the number of investors in American Superconductor increased 20.96% year over year.
Activity in AMSC broke down as 174 buyers, 77 sellers, and 26 unchanged among 277 total holders.
Combined, these investors held 35.74Mn shares in AMSC for June 2026, up by 4.04Mn shares quarter on quarter, and up 3.96Mn shares year over year.
BlackRock, Inc. holds the largest position in AMSC at 4.1Mn shares as of June 30, 2026, or 8.93% of shares outstanding.
The biggest buyers of American Superconductor for the quarter ending June 2026 included UBS Group AG (829.27K), Goldman Sachs Group Inc (584.54K), BARROW HANLEY MEWHINNEY & STRAUSS LLC (564.21K), Ranger Investment Management, L.P. (405.27K), Sixth Street Partners Management Company, L.P. (399.12K).
The biggest sellers of American Superconductor for the quarter ending June 2026 included BAILLIE GIFFORD & CO (514.11K), Nuveen, LLC (392.54K), VANGUARD PORTFOLIO MANAGEMENT LLC (292.81K), Portolan Capital Management, LLC (266.32K), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (215.85K).
Per Business Quant, the top 10 investors in AMSC for the quarter ending June 2026 include BlackRock, Inc. (4.1Mn), VANGUARD CAPITAL MANAGEMENT LLC (2.03Mn), BARROW HANLEY MEWHINNEY & STRAUSS LLC (1.7Mn), UBS Group AG (1.43Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.42Mn), State Street Corp (1.36Mn), Goldman Sachs Group Inc (1.29Mn), GEODE CAPITAL MANAGEMENT, LLC (1.24Mn), FIRST TRUST ADVISORS LP (1.17Mn), OBERWEIS ASSET MANAGEMENT INC/ (987.5K).

Form 13F Holdings

277 Institutional Holders

Report period 30 Jun, 2026

Total shares held 35.74Mn

Of outstanding 77.91%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	4,095,371	8.93%	▲112,721	+2.83%	$170.00Mn
2	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	2,034,219	4.43%	▼5,249	-0.26%	$84.44Mn
3	BARROW HANLEY MEWHINNEY & STRAUSS LLC	0000313028	1,704,006	3.71%	▲564,213	+49.50%	$70.73Mn
4	UBS Group AG	0001610520	1,429,090	3.12%	▲829,269	+138.25%	$59.32Mn
5	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	1,418,863	3.09%	▼292,814	-17.11%	$58.90Mn
6	State Street Corp	0000093751	1,358,225	2.96%	▲97,154	+7.70%	$56.38Mn
7	Goldman Sachs Group Inc	0000886982	1,294,047	2.82%	▲584,543	+82.39%	$53.72Mn
8	GEODE CAPITAL MANAGEMENT, LLC	0001214717	1,243,198	2.71%	▲74,046	+6.33%	$51.62Mn
9	FIRST TRUST ADVISORS LP	0001125816	1,168,424	2.55%	▲390,156	+50.13%	$48.50Mn
10	OBERWEIS ASSET MANAGEMENT INC/	0000937886	987,500	2.15%	▲137,600	+16.19%	$40.99Mn
11	AWM Investment Company, Inc.	0001535264	951,604	2.07%	▲150,000	+18.71%	$39.50Mn
12	BAILLIE GIFFORD & CO	0001088875	933,308	2.03%	▼514,111	-35.52%	$38.74Mn
13	EMERALD ADVISERS, LLC	0001015083	843,956	1.84%	▲86,552	+11.43%	$35.03Mn
14	Legal & General Group Plc	0000764068	756,863	1.65%	▲226,732	+42.77%	$31.42Mn
15	DIMENSIONAL FUND ADVISORS LP	0000354204	645,991	1.41%	▼12,306	-1.87%	$26.81Mn
16	Morgan Stanley	0000895421	635,833	1.39%	▲1,992	+0.31%	$26.39Mn
17	Nuveen, LLC	0001871926	628,406	1.37%	▼392,541	-38.45%	$26.09Mn
18	Telemark Asset Management, LLC	0001420816	600,000	1.31%	0	0.00%	$24.91Mn
19	ROYCE & ASSOCIATES LP	0000906304	555,821	1.21%	▲13,043	+2.40%	$23.07Mn
20	EMERALD MUTUAL FUND ADVISERS TRUST	0001352895	538,955	1.17%	▲100,080	+22.80%	$22.37Mn

Showing 1 to 20 of 277 holders