Mariner
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Mariner’s American Superconductor AMSC Stock Holding History

Mariner’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 		$778K Sell
18,751
-6,399
-25% -$289K ﹤0.01% 2146
2026
Q1 		$851K Buy
25,150
+4,587
+22% +$145K ﹤0.01% 2084
2025
Q4 		$592K Buy
20,563
+7,336
+55% +$317K ﹤0.01% 2338
2025
Q3 		$786K Buy
13,227
+932
+8% +$46.6K ﹤0.01% 2087
2025
Q2 		$451K Buy
+12,295
New +$302K ﹤0.01% 2409
2025
Q1 		– Sell
-8,207
Closed -$202K – 3437
2024
Q4 		$202K Buy
+8,207
New +$226K ﹤0.01% 2994

Other funds holding AMSC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Barrow, Hanley, Mewhinney & Strauss
Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $33B AUM 40.62% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
First Trust Advisors
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

Mariner's AMSC Position: Q2 2026 in Review

Mariner reduced its American Superconductor (AMSC) stake by 25% in Q2 2026, selling an estimated $289K and leaving 18,751 shares worth $778K. The position accounts for ﹤0.01% of the portfolio, ranked #2146.

Mariner first reported a position in AMSC in Q4 2024 and has held it in 6 quarters since. The position peaked at $851K in Q1 2026. 279 funds tracked by Wall St. Rank hold AMSC as of Q2 2026.

  • Mariner held 18,751 shares of American Superconductor worth $778K as of Q2 2026.
  • Mariner sold 6,399 American Superconductor shares in Q2 2026, an estimated $289K.
  • American Superconductor made up ﹤0.01% of Mariner's portfolio in Q2 2026, its #2146 holding.
  • Mariner first reported a position in American Superconductor in Q4 2024 and has held it in 6 quarters since.
  • Mariner's American Superconductor position peaked at $851K in Q1 2026.
  • 279 funds tracked by Wall St. Rank held American Superconductor as of Q2 2026.

Based on Mariner's 13F filing for Q2 2026, filed 13 Aug 2026.