Gina Francolla is the Senior Producer of Quantitative & Market Data Services at CNBC.
A diverse group of S&P 500 companies have already made it back to or near near their January high.
After Friday's open, 367 S&P 500 companies — or 73 percent — are at or beyond correction level.
There are 339 companies in the S&P at correction levels or better, 82 of those at bear market levels.
Stocks hit a rut this week after coming out of the gates strong in 2018.
Fed Chair Janet Yellen leaves her post after four years, and during that time it was smooth sailing for stocks, with tech shares doubling.
U.S. stocks closed lower Friday, the last trading day of the year, with no S&P 500 sectors ending higher.
The U.S. dollar weakened after the Federal Reserve hiked interest rates, but left its rate outlook for the coming years unchanged.
U.S. government debt yields rose Wednesday after the release of stronger-than-expected economic data.
U.S. government debt yields rose Wednesday, as investors awaited the latest economic releases from the U.S., including the Beige Book.
The Dow Jones industrial average rose on Tuesday, and broke above 23,000 for the first time on an intraday basis.