$ROCK is one of biggest winner #stocks today. read more:

Gibraltar Industries, Inc. (symbol: ROCK) was one of the biggest winners of
the trading day today (2015-09-28), gaining 3.28%. The number of shares
that changed hands was 342,160, or about 2.1 times the average daily volume
in the stock.
The closing price was $17.61, amounting to a market cap of $549,590,000,
about -18.05% off the highest price in the last 12 months. The stock has
been trading at a range between $12.65 and $21.49.
ROCK is in the Steel/Iron Ore industry, part of the Capital Goods sector.
It first went public in 1993.