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

Federal Signal Corporation Comm (symbol: FSS) was one of the worst losers
of the trading day today (2016-05-03), losing -11.67%. The number of shares
that changed hands was 891,168, or about 3 times the average daily volume
in the stock.
The closing price was $12.26, amounting to a market cap of $762,570,000,
about -28.85% off the highest price in the last 12 months. The stock has
been trading at a range between $11.16 and $17.23.
FSS is in the Auto Manufacturing industry, part of the Capital Goods sector.
Looking at its valuation, the stock is now trading at 12.21 times earnings.