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

Macy's Inc Common Stock (symbol: M) was one of the worst losers of the
trading day today (2017-01-05), losing -13.9%. The number of shares that
changed hands was 29,236,608, or about 5 times the average daily volume in
the stock.
The closing price was $30.86, amounting to a market cap of $9,430,000,000,
about -32.18% off the highest price in the last 12 months. The stock has
been trading at a range between $29.94 and $45.5.
M is in the Department/Specialty Retail Stores industry, part of the
Consumer Services sector.
Looking at its valuation, the stock is now trading at 14.05 times earnings.