The most surprising stock market trends of 2017

2017 has been a great year for the U.S. stock market, with the S&P 500 index up more than 16 percent in December. However, a headline number never tells the full story. The year has been full of stocks to buy, stocks to sell and stocks to watch. Here's a look at some of the most eye-opening market events and trends in 2017. More than anything else, the list is a reminder that not even market experts always know what lies ahead. Click through to see the most surprising trends of 2017, and learn what might be a good buy in 2018.

This article originally appeared on GOBankingRates.com: The Most Surprising Stock Market Trends of 2017