$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 (2016-06-28), losing -18.963%. The number of shares that changed
hands was 4,301,582, or about 10 times the average daily volume in the
stock.
The closing price was $23.825, amounting to a market cap of $928,290,000,
about -63.346% off the highest price in the last 12 months. The stock has
been trading at a range between $21.74 and $65.0.
SCOR is in the Business Services industry, part of the Miscellaneous
sector. It first went public in 2007.