$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 (2016-02-24), losing -26.98%. The number of shares
that changed hands was 8,398,231, or about 33 times the average daily
volume in the stock.
The closing price was $26.5, amounting to a market cap of $1,110,000,000,
about -56.11% off the highest price in the last 12 months. The stock has
been trading at a range between $18.87 and $60.38.
ABCO is in the Other Consumer Services industry, part of the Consumer
Services sector. It first went public in 2001.