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

Stamps.com Inc. (symbol: STMP) was one of the worst losers of the trading
day today (2016-04-01), losing -6.61%. The number of shares that changed
hands was 1,258,329, or about 3 times the average daily volume in the stock.
The closing price was $99.26, amounting to a market cap of $1,650,000,000,
about -19.79% off the highest price in the last 12 months. The stock has
been trading at a range between $60.16 and $123.75.
STMP is in the Business Services industry, part of the Miscellaneous
sector. It first went public in 1999.