Portolan Capital Management’s American Superconductor AMSC Stock Holding History

Portolan Capital Management’s Portfolio AMSC Stock Details AMSC Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$1.22M	Sell	29,314 -266,322	-90%	-$12M	0.05%	140
2026 Q1	$10M	Buy	+295,636	New	+$9.33M	0.53%	58
2021 Q1	–	Sell	-166,935	Closed	-$3.91M	–	153
2020 Q4	$3.91M	Buy	+166,935	New	+$2.96M	0.36%	102

Other funds holding AMSC

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $33B AUM 40.62% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return

OAM

Oberweis Asset Management Lisle, Illinois $4.84B AUM 160.95% 1-Year Est. Return

Portolan Capital Management's AMSC Position: Q2 2026 in Review

Portolan Capital Management reduced its American Superconductor (AMSC) stake by 90% in Q2 2026, selling an estimated $12M and leaving 29,314 shares worth $1.22M. The position accounts for 0.05% of the portfolio, ranked #140.

Portolan Capital Management first reported a position in AMSC in Q4 2020 and has held it in 3 quarters since. The position peaked at $10M in Q1 2026. 279 funds tracked by Wall St. Rank hold AMSC as of Q2 2026.

Portolan Capital Management held 29,314 shares of American Superconductor worth $1.22M as of Q2 2026.
Portolan Capital Management sold 266,322 American Superconductor shares in Q2 2026, an estimated $12M.
American Superconductor made up 0.05% of Portolan Capital Management's portfolio in Q2 2026, its #140 holding.
Portolan Capital Management first reported a position in American Superconductor in Q4 2020 and has held it in 3 quarters since.
Portolan Capital Management's American Superconductor position peaked at $10M in Q1 2026.
279 funds tracked by Wall St. Rank held American Superconductor as of Q2 2026.

Based on Portolan Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.