On 1/20/1997 the Archipelago ECN began trading. In 2005, Archipelago Holdings, the owner of ArcaEx, bought the Pacific Stock Exchange; Archipelago Holdings merged with NYSE Group in April 2006 in a reverse takeover and the business was renamed NYSE Arca. In WRDS, the NYSE Arca daily and monthly data were added in July 2007 for securities with primary listings on that exchange. NYSE Arca coverage begins on March 8, 2006 and appeared in CRSP as a separate index with Equal and value-weighted returns. Sometime after 2013, WRDS stopped providing a separate index for ARCA and those trades are now reflected in the NYSE index. Current exchanges realtime volume is available at https://iextrading.com/apps/market/
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