AMSC — American Superconductor com

Ownership history in OBERWEIS ASSET MANAGEMENT INC/  ·  17 quarters on record

This page tracks every 13F SEC filing in which OBERWEIS ASSET MANAGEMENT INC/ 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
2.36% (2009 Q4)
Avg. % of fund
1.03%
First filed
2009 Q2
Last filed
2025 Q4
Quarters held
17
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 ADDED 835,900 +170,200 +25.6% 0.88% $24.1M $28.78
2025 Q3 REDUCED 665,700 -2,500 -0.4% 1.51% $39.5M $59.39
2025 Q2 UNCHANGED 668,200 — 0% 1.07% $24.5M $36.69
2025 Q1 ADDED 668,200 +3,800 +0.6% 0.60% $12.1M $18.14
13 older quarters hidden  —  Sign in free or upgrade to Premium to see full history
% 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% 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% OXFORD ASSET MANAGEMENT LLP 3Y 7Y 0.25%
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