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

GTT Communications, Inc. Common (symbol: GTT) was one of the worst losers
of the trading day today (2015-08-27), losing -5.57%. The number of shares
that changed hands was 632,955, or about 3 times the average daily volume
in the stock.
The closing price was $21.02, amounting to a market cap of $734,100,000,
about -18.08% off the highest price in the last 12 months. The stock has
been trading at a range between $11.25 and $25.66.
GTT is in the Telecommunications Equipment industry, part of the Public
Utilities sector.