After-Hours Buzz: Cintas, Marathon Petroleum, Brown & Brown & More
Check out which companies are making headlines after the bell Monday:

Cintas - The uniforms maker posted earnings of 69 cents a share, missing expectations by a penny a share, while revenue matched expectations at $1.13 billion. In addition, the company handed in 2014 earnings guidance that disappointed analysts, sending shares lower in extended-hours trading.

"While the U.S. economy has shown some signs of improvement in the past several months, much uncertainty remains," CEO Scott Farmer wrote in a press release. "This uncertainty, due to a number of factors including the effect of the Affordable Care Act, continues to cause many of our customers to delay hiring and investment decisions. We have developed our fiscal 2014 expectations with this uncertain economic landscape in mind."

(Read more: Stocks finish at fresh highs; S&P 500 posts 8-day winning streak)

Marathon Petroleum - The company said it expects to post earnings of between $1.87 a share and $1.97 a share, sharply below current expectations for $2.62 a share, citing lower crude oil price differentials and product realizations compared with spot market values. Shares declined in extended-hours trading. The company is slated to post earnings Aug. 1.