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

Mallinckrodt plc Ordinary Share (symbol: MNK) was one of the worst losers
of the trading day today (2017-01-18), losing -5.85%. The number of shares
that changed hands was 13,553,621, or about 6 times the average daily
volume in the stock.
The closing price was $46.53, amounting to a market cap of $4,930,000,000,
about -45.79% off the highest price in the last 12 months. The stock has
been trading at a range between $42.67 and $85.83.
MNK is in the Major Pharmaceuticals industry, part of the Health Care
sector. It first went public in 2013.
Looking at its valuation, the stock is now trading at 8.05 times earnings.