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NYSE Arca, previously known as ArcaEx, an abbreviation of Archipelago Exchange, is a securities exchange on which both stocks and options are traded. It is owned by NYSE Euronext, which merged (as NYSE Group) with Archipelago Holdings in a reverse merger on 2006-02-27.
Early reports indicate that NYSE Arca may have played an early role in the 2010 Flash Crash
The NYSE Arca exchange is headquartered in Chicago, Illinois. 
As of 1 March 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.
NYSE Arca's liquidity fee/rebate structure resembles that of other electronic communication networks. In late 2006, it was the first one to offer NASDAQ-style fees on New York Stock Exchange-listed securities, a move that was soon copied by NASDAQ and other electronic communication networks. NYSE Arca charges traders that remove liquidity from the Arca-book $3.00 per 1,000 shares. Traders that add liquidity receive a $2.00 rebate per 1,000 shares. Traders that route orders out of the NYSE Arca system are charged $1.00 per 1,000 shares for Tape A securities and $4.00 per 1,000 shares for other securities.
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