$AEIS is one of biggest losers #stocks today. read more:

Advanced Energy Industries, Inc (symbol: AEIS) was one of the worst losers
of the trading day today (2016-04-20), losing -5.85%. The number of shares
that changed hands was 630,959, or about 2 times the average daily volume
in the stock.
The closing price was $32.5, amounting to a market cap of $1,300,000,000,
about -9.19% off the highest price in the last 12 months. The stock has
been trading at a range between $21.12 and $35.79.
AEIS is in the Industrial Machinery/Components industry, part of the
Capital Goods sector. It first went public in 1995.