'My biggest mistake'

The folks on Fortune's 40 under 40 list may be rising stars, but they're not perfect. Here are the decisions they most regret in their careers.

40 under 40
Full list: Top 40
Full list: Top 40
Meet these young innovators, value creators, and agents of change. More
20 highest paid
20 highest paid
Which young executives at public companies raked it in - and how much did they earn? More
They're hiring!
They're hiring!
These stars on our list have great jobs to fill. What are they looking for and how can you impress them? More
8 over 80
8 over 80
Youth isn't everything. These aging titans are still cutting deals and calling the shots. More
Can you pass the '40 under 40' test?
Can you pass the '40 under 40' test?
Take our quiz and see how much you know. More
40 under 40
Full list: Top 40
Full list: Top 40
Meet these young innovators, value creators, and agents of change. More
20 highest paid
20 highest paid
Which young executives at public companies raked it in - and how much did they earn? More
They're hiring!
They're hiring!
These stars on our list have great jobs to fill. What are they looking for and how can you impress them? More
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10 multi-million-dollar mega-yachts
10 multi-million-dollar mega-yachts
These folks definitely do not need a bigger boat. Peek inside some of the swankiest vessels on the high seas. More
Meet Facebook's "adult supervision"
Meet Facebook's "adult supervision"
The same seasoned vets Mark Zuckerberg leaned on for wisdom may now be tangled in the company's messy IPO. Here's a look at who's who. More
Thinking of you: Greeting cards for the Fortune 500
A bouquet of wishes for the folks on this year's list More
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