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

Mentor Graphics Corporation (symbol: MENT) was one of the worst losers of
the trading day today (2015-11-20), losing -35.75%. The number of shares
that changed hands was 19,903,692, or about 26 times the average daily
volume in the stock.
The closing price was $17.85, amounting to a market cap of $2,090,000,000,
about -36.45% off the highest price in the last 12 months. The stock has
been trading at a range between $17.78 and $28.09.
MENT is in the EDP Services industry, part of the Technology sector. It
first went public in 1984.
Looking at its valuation, the stock is now trading at 13.5 times earnings.