Is the U.S. stock market open on Thanksgiving and Black Friday? What investors need to know.

Investors can pause to give thanks for a November stock-market rally on Thursday. U.S. markets will be closed for Thanksgiving Day.

But while employees of many non-retail businesses will stretch the holiday into a four-day weekend, taking off Black Friday, markets will see a partial day of trading on the day after Turkey Day.

Major U.S. stock…