The market is having a rough start in 2016, characterized by extreme volatility and giant market swings throughout the month. The S&P 500 Index slumped 5.1% in January.

Friday's positive performance by all three indices gave market participants some relief as it tempered the month's horrific returns. But some stocks just couldn't catch a break.

Plunging oil prices, growth concerns in China, new concerns over the Federal Reserve's timeline for further interest rate hikes and a so-so earnings season so far for U.S. companies are all contributors to the month's volatile market swings.

Here are the 5 worst laggards in the S&P 500 this month. Also check out the 5 Best-Performing Stocks of 2016.