$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 (2016-04-28), losing -13.44%. The number of shares
that changed hands was 5,370,919, or about 5 times the average daily volume
in the stock.
The closing price was $11.34, amounting to a market cap of $1,040,000,000,
about -34.94% off the highest price in the last 12 months. The stock has
been trading at a range between $7.18 and $17.43.
LOCK is in the EDP Services industry, part of the Technology sector. It
first went public in 2012.