Yes. The New York Stock Exchange and Nasdaq will both operate on half-day schedules, closing at 1 p.m., while bond markets will shut down at 2 p.m., and major U.S. financial markets will stay closed until Thursday’s normal trading session.

Wall Street is eager for a so-called Santa Claus rally to propel the S&P 500—up about 25% this year through Monday's close—to new highs. According to Wall Street lore, the stock market consistently rises during the final five trading days of the year and the first two sessions of the next. This year, that stretch starts today.