$AMSC stock is down 9% today. Here's what we see in our data.

$AMSC stock has now fallen 9% today, according to our price data from Polygon. There has been approximately $105,439,437 of trading volume.

It has been the 888th most-searched ticker on Quiver Quantitative over the last day, out of 12,257 total tickers searched.

Here is what we see in our data on $AMSC (you can track the company live on Quiver's $AMSC stock page):

$AMSC Insider Trading Activity

$AMSC insiders have traded $AMSC stock on the open market 1 times in the past 6 months. Of those trades, 0 have been purchases and 1 have been sales.

Here’s a breakdown of recent trading of $AMSC stock by insiders over the last 6 months:

• DAVID R JR OLIVER sold 200 shares for an estimated $6,820

To track insider transactions, check out Quiver Quantitative's insider trading dashboard. You can access data on insider stock transactions through the Quiver Quantitative API insider transaction endpoint.

$AMSC Hedge Fund Activity

We have seen 157 institutional investors add shares of $AMSC stock to their portfolio, and 153 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

• BARROW HANLEY MEWHINNEY & STRAUSS LLC added 1,139,793 shares (+inf%) to their portfolio in Q1 2026, for an estimated $38,581,993
• ATREIDES MANAGEMENT, LP removed 1,044,193 shares (-100.0%) from their portfolio in Q1 2026, for an estimated $35,345,933
• FULLER & THALER ASSET MANAGEMENT, INC. removed 809,945 shares (-100.0%) from their portfolio in Q4 2025, for an estimated $23,310,217
• VANGUARD GROUP INC added 576,831 shares (+19.6%) to their portfolio in Q4 2025, for an estimated $16,601,196
• DRIEHAUS CAPITAL MANAGEMENT LLC removed 499,984 shares (-100.0%) from their portfolio in Q1 2026, for an estimated $16,924,458
• MACQUARIE GROUP LTD removed 465,221 shares (-100.0%) from their portfolio in Q4 2025, for an estimated $13,389,060
• WELLINGTON MANAGEMENT GROUP LLP removed 399,246 shares (-100.0%) from their portfolio in Q4 2025, for an estimated $11,490,299

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Quiver Quantitative API 13F endpoint.

You can track data on $AMSC on Quiver Quantitative.

This article is not financial advice. See Quiver Quantitative's disclaimers for more information. Note that there may be inaccuracies due to mistakes in ticker-mapping, and other anomalies.