"I've been really, really amazed by Jeff Bezos at Amazon," said Moderna Therapeutics CEO Stephane Bancel, a sentiment echoed by Ted Bailey, CEO of Dataminr, a company that uses algorithms to classify real-time data from Twitter streams.
"Because if you look at where they came from, selling books online, to where they are now, in terms of just launching the phone, having the Kindle as a reading device, the Amazon Cloud, and they are building more and more verticals, this is for me a true example of thinking big, being very long-term, and just making it happen," Bancel said.
And one social network executive's name came up in interviews on the most dynamic executives in business today, but it wasn't Mark Zuckerberg.
"Jeff Weiner at LinkedIn I think has done a superb job at truly building a great customer base and at being pretty conservative and methodical about earning trust from his customers, and that allows LinkedIn now to be more aggressive and releasing more features they probably could not have released if they had not spent that much time building trust and building their reputation," said Renaud Laplanche, CEO of Lending Club, a peer-to-peer lending site.
—By CNBC's Althea Chang