Forbes has released their list of the 20 most powerful American CEO's 40 and under. Spencer Rascoff the CEO of Zillow stays on the list while Peter Flint, the CEO of Trulia, has dropped off the list.
The definition of powerful is rather simple - power is defined as market cap. As Forbes says "The individuals who meet the criteria for this list are from the 20 publicly-traded companies with the highest market caps (as of market close March 5, 2014) who have CEOs ages 40 and younger. All data is taken from S&P Capital IQ."
Others on the list are Google's Larry Page, Mark Zuckerberg from Facebook, and Marissa Mayer from Yahoo!.
Check out the article hear at Forbes.