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

The Advisory Board Company (symbol: ABCO) was one of the worst losers of
the trading day today (2015-08-05), losing -20.84%. The number of shares
that changed hands was 2,544,900, or about 8 times the average daily volume
in the stock.
The closing price was $46.99, amounting to a market cap of $1,990,000,000,
about -22.18% off the highest price in the last 12 months. The stock has
been trading at a range between $37.47 and $60.38.
ABCO is in the Other Consumer Services industry, part of the Consumer
Services sector. It first went public in 2001.
Looking at its valuation, the stock is now trading at 270.06 times earnings.