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

ADT Corporation Common Stock (symbol: ADT) was one of the worst losers of
the trading day today (2016-02-02), losing -15.66%. The number of shares
that changed hands was 11,638,192, or about 6 times the average daily
volume in the stock.
The closing price was $24.94, amounting to a market cap of $4,110,000,000,
about -41.84% off the highest price in the last 12 months. The stock has
been trading at a range between $24.22 and $42.88.
ADT is in the Diversified Commercial Services industry, part of the
Consumer Services sector.
Looking at its valuation, the stock is now trading at 14.5 times earnings.