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

Nielsen N.V. Ordinary Shares (symbol: NLSN) was one of the worst losers of
the trading day today (2016-10-25), losing -16.89%. The number of shares
that changed hands was 21,051,815, or about 11 times the average daily
volume in the stock.
The closing price was $45.65, amounting to a market cap of $16,310,000,000,
about -18.39% off the highest price in the last 12 months. The stock has
been trading at a range between $42.9 and $55.94.
NLSN is in the Business Services industry, part of the Miscellaneous
sector. It first went public in 2011.
Looking at its valuation, the stock is now trading at 27.6 times earnings.