Exxon 0
An EXXON service station on March 13, 2012 in Washington, D.C. - 

There's been a change at the top of the 'Which is the biggest company in the world?' chart.

Apple shares, as you may know, have been sliding of late. They're down another 5.5 percent, close to $400 a piece. What that means for you and me? Not much, unless AAPL is in your retirement portfolio.

But in the market capitalization bragging rights contest, it bumps Apple back down below Exxon as the most valuable publicly traded company on the planet.

Follow Kai Ryssdal at @kairyssdal