Will the US markets be open on December 24th?

The NYSE Trading Floor will close early on Tuesday, July 3rd, 2007; Friday, November 23rd, 2007 (the day after Thanksgiving); and Monday, December 24, 2007. The Trading Floor will close at 1:00 p.m. Crossing Session I order entry will begin at 1:15 p.m. with order executions at 1:30 p.m., and Crossing Sessions II, III and IV orders will be accepted beginning at 1:00 p.m. for continuous executions until 1:30 p.m. on these dates.

On Monday, December 24, 2007, NASDAQ® will close at 1:00 p.m., ET, and will conduct a modified extended-hours session until 5:00 p.m., ET. Most NASDAQ systems will close three hours early.