AMSC — AMERICAN SUPERCONDUCTOR COM

Ownership history in CASTLEARK MANAGEMENT LLC  ·  3 quarters on record

This page tracks every 13F SEC filing in which CASTLEARK MANAGEMENT LLC reported a position in AMERICAN SUPERCONDUCTOR COM (AMSC). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
0.23% (2025 Q3)
Avg. % of fund
0.13%
First filed
2008 Q2
Last filed
2025 Q3
Quarters held
3
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q3 ADDED 135,617 +26,447 +24.2% 0.23% $8.1M $59.39
2025 Q2 ADDED 109,170 +83,670 +328.1% 0.12% $4.0M $36.69
2008 Q2 INITIATED 25,500 — — 0.05% $914K $358.50
% of Fund (quarterly)    AMSC price (monthly, adj. close)

Other funds also holding AMSC

As of 2025 Q4 — sorted by position size

AWM Investment Company, Inc. 3Y 7Y 2.1% Telemark Asset Management, LLC 3Y 7Y 1.78% ESSEX INVESTMENT MANAGEMENT CO LLC 3Y 7Y 0.94% OBERWEIS ASSET MANAGEMENT INC/ 3Y 7Y 0.88% Lumbard & Kellner, LLC 3Y 7Y 0.72% EMERALD ADVISERS, LLC 3Y 7Y 0.67% Dynamic Technology Lab Private Ltd 3Y 7Y 0.45% Atreides Management, LP 3Y 0.37% VIRTUS ADVISERS, LLC 3Y 7Y 0.35% Fund Advisors of America Inc/FL 0.29%
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