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

Pearson, Plc Common Stock (symbol: PSO) was one of the worst losers of the
trading day today (2015-10-21), losing -16.69%. The number of shares that
changed hands was 3,935,944, or about 4 times the average daily volume in
the stock.
The closing price was $15.32, amounting to a market cap of $12,460,000,000,
about -31.82% off the highest price in the last 12 months. The stock has
been trading at a range between $15.29 and $22.47.
PSO is in the Books industry, part of the Consumer Services sector.
Looking at its valuation, the stock is now trading at 48.95 times earnings.