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

United Natural Foods, Inc. (symbol: UNFI) was one of the worst losers of
the trading day today (2015-07-21), losing -16.77%. The number of shares
that changed hands was 5,352,441, or about 9 times the average daily volume
in the stock.
The closing price was $52.05, amounting to a market cap of $2,610,000,000,
about -37.97% off the highest price in the last 12 months. The stock has
been trading at a range between $51.92 and $83.91.
UNFI is in the Food Distributors industry, part of the Consumer
Non-Durables sector. It first went public in 1996.
Looking at its valuation, the stock is now trading at 19.21 times earnings.