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

West Pharmaceutical Services, I (symbol: WST) was one of the worst losers
of the trading day today (2016-09-21), losing -7.81%. The number of shares
that changed hands was 1,593,434, or about 4 times the average daily volume
in the stock.
The closing price was $74.97, amounting to a market cap of $5,490,000,000,
about -11.1% off the highest price in the last 12 months. The stock has
been trading at a range between $52.79 and $84.33.
WST is in the Specialty Chemicals industry, part of the Basic Industries
sector.
Looking at its valuation, the stock is now trading at 54.6 times earnings.