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

Exponent, Inc. (symbol: EXPO) was one of the worst losers of the trading
day today (2016-07-20), losing -11.15%. The number of shares that changed
hands was 1,228,871, or about 13 times the average daily volume in the
stock.
The closing price was $51.89, amounting to a market cap of $1,350,000,000,
about -13.1% off the highest price in the last 12 months. The stock has
been trading at a range between $40.58 and $59.71.
EXPO is in the Professional Services industry, part of the Consumer
Services sector.
Looking at its valuation, the stock is now trading at 29.15 times earnings.