You are right... Trading Hours NYSE, NYSE MKT
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Trading Hours
NYSE, NYSE MKT and NYSE Amex Options are open from Monday through Friday 9:30 a.m. to 4:00 p.m. ET. NYSE Arca is also open from 4:00 a.m. to 9:30 a.m. ET and 4:00 p.m. to 8:00 p.m. ET.
Holidays
NYSE, NYSE MKT, NYSE Amex Options, NYSE Arca, NYSE Arca Options, and NYSE Bonds will observe U.S. holidays as listed below. Although NYSE Arca follows the same holiday schedule as the NYSE, on days when the NYSE closes early, NYSE Arca hours may vary due to its extended trading day.
2014
New Years Day January 1
Martin Luther King, Jr. Day January 20
Washington's Birthday February 17
Good Friday April 18
Memorial Day May 26
Independence Day July 4**
Labor Day September 1
Thanksgiving Day November 27*
Christmas December 25***