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

LifeLock, Inc. Common Stock (symbol: LOCK) was one of the worst losers of
the trading day today (2015-07-23), losing -9.78%. The number of shares
that changed hands was 11,622,626, or about 5 times the average daily
volume in the stock.
The closing price was $8.03, amounting to a market cap of $757,790,000,
about -58.07% off the highest price in the last 12 months. The stock has
been trading at a range between $7.7 and $19.15.
LOCK is in the EDP Services industry, part of the Technology sector. It
first went public in 2012.