American Superconductor Corporation AMSC

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23.39 USD -0.59 (-2.46%)

At closeNov 6, 2026, 5:20 PM EST

23.45 +0.06 +0.26%

After hours · Nov 6, 5:20 PM ET

22.18 Day range 25.38

23.39 52-week range 58.72

Held by insiders 3.45%

Held by institutions 75.12%

Float held by institutions 77.80%

Institutions 380

Top institutional holders
Holder	% held	Shares	Value	Reported
Blackrock Inc.	8.45%	4,095,371	95.79M	Jun 29, 2026
Vanguard Capital Management LLC	4.20%	2,034,219	47.58M	Jun 29, 2026
Barrow, Hanley Mewhinney & Strauss, LLC	3.52%	1,704,006	39.86M	Jun 29, 2026
UBS Group AG	2.95%	1,429,090	33.43M	Jun 29, 2026
Vanguard Portfolio Management LLC	2.93%	1,418,863	33.19M	Jun 29, 2026
State Street Corporation	2.80%	1,358,225	31.77M	Jun 29, 2026

Top mutual fund holders
Holder	% held	Shares	Value	Reported
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund	2.97%	1,441,062	33.71M	Jun 29, 2026
iShares Trust-iShares Russell 2000 ETF	2.54%	1,228,883	28.74M	Sep 29, 2026
OBERWEIS FUNDS-Oberweis Micro-Cap Fund	1.91%	925,300	21.64M	Jun 29, 2026
First TRT Exch-Trd Fd. II-First TRT NASDAQ Clean Edge Smart Grid Infra	1.37%	662,230	15.49M	Sep 29, 2026
VANGUARD INDEX FUNDS-Vanguard Extended Market Index Fund	1.13%	546,978	12.79M	Jun 29, 2026
Fidelity Salem Street Trust-Fidelity Small Cap Index Fund	1.08%	523,874	12.25M	Aug 30, 2026

AMSC insiders
Insider	Relation	Latest transaction	Date	Shares held
DAMBIER LAURA A.	Director	Sale	Jun 10, 2026	14,992
DONNELLY TERENCE ROBERT	Director	Stock Award(Grant)	Apr 1, 2026	2,665
HOUSE ARTHUR H	Director	Stock Award(Grant)	Apr 1, 2026	51,779
KLEIN MARGARET D.	Director	Stock Award(Grant)	Apr 1, 2026	19,492
KOSIBA JOHN W. JR.	Chief Financial Officer	Sale	Jun 10, 2026	334,748
LITTLEFIELD BARBARA G.	Director	Stock Award(Grant)	Sep 17, 2026	37,034

Held by funds