The New York Stock Exchange (NYSE), also known as the 'Big Board', is one of the primary equity markets in the United States. Founded in 1817, it has long been an icon of capitalism. Over the years, NYSE has merged with other exchanges globally and is now a flagship exchange in the NYSEEuronext group.
The NASDAQ OMX Group owns and operates 26 markets, making them the largest exchange company in the world
NYSE Arca, previously known as ArcaEx, is a securities exchange on which both stocks and options are traded. On February 27, 2006, ArcaEx merged with NYSE Group in a reverse merger and the business was renamed NYSE Arca. The fully electronic NYSE Arca trades more than 8,000 exchange-listed equity securities, including on NASDAQ.
As of 2007, NYSE Arca is the second-largest electronic communication network in terms of shares traded. Approximately one out of every six shares traded on the American financial markets is traded on the system. For New York Stock Exchange–listed securities or Tape A, it accounts for just over 10% of the shares traded. For NASDAQ-listed securities, NYSE Arca accounts for approximately 20% of the trading volume. For exchange-traded funds, NYSE Arca accounts for 30–40% of the traded volume
o A) 10% or more with respect to securities included in the S&P 500 Index, Russell 1000 Index, and the Invesco Power Shares QQQ exchange traded fund;
o B) 30% or more with respect to all Tier 2 NMS Stocks with a price equal to or greater than 4; and
o C) 50% or more with respect to all Tier 2 NMS Stocks with a price less than $1. The determination that the price of a stock is equal to or greater than $1 in b) or less than $1 in c) shall be based on the closing price on the previous trading day, or, if no closing price exists, the last sale reported to the Consolidated Tape on the previous trading day. See NYSE Arca Rule 7.11.