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

Alcoa Inc. Common Stock (symbol: AA) was one of the worst losers of the
trading day today (2016-10-11), losing -11.42%. The number of shares that
changed hands was 32,647,929, or about 5 times the average daily volume in
the stock.
The closing price was $27.91, amounting to a market cap of $12,240,000,000,
about -19.1% off the highest price in the last 12 months. The stock has
been trading at a range between $18.42 and $34.5.
AA is in the Metal Fabrications industry, part of the Capital Goods sector.