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

comScore, Inc. (symbol: SCOR) was one of the worst losers of the trading
day today (2016-03-07), losing -33.58%. The number of shares that changed
hands was 9,488,812, or about 12 times the average daily volume in the
stock.
The closing price was $27.04, amounting to a market cap of $1,050,000,000,
about -58.4% off the highest price in the last 12 months. The stock has
been trading at a range between $26.21 and $65.0.
SCOR is in the Business Services industry, part of the Miscellaneous
sector. It first went public in 2007.