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

Grana y Montero S.A.A. American (symbol: GRAM) was one of the worst losers
of the trading day today (2017-01-12), losing -12.15%. The number of shares
that changed hands was 794,323, or about 5 times the average daily volume
in the stock.
The closing price was $4.41, amounting to a market cap of $582,160,000,
about -50.78% off the highest price in the last 12 months. The stock has
been trading at a range between $2.18 and $8.96.
GRAM is in the Military/Government/Technical industry, part of the Basic
Industries sector. It first went public in 2013.