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

CEB Inc. Common Stock (symbol: CEB) was one of the worst losers of the
trading day today (2015-07-29), losing -11.21%. The number of shares that
changed hands was 985,136, or about 6 times the average daily volume in the
stock.
The closing price was $76.98, amounting to a market cap of $2,580,000,000,
about -15.93% off the highest price in the last 12 months. The stock has
been trading at a range between $57.58 and $91.57.
CEB is in the Professional Services industry, part of the Consumer Services
sector.
Looking at its valuation, the stock is now trading at 41.84 times earnings.