Michael Sonnenfeldt deals with a specific group of clients—a peer-to-peer network of high net worth individuals who pay $30,000 in annual membership fees.
The founder of investment firm Tiger 21 describes his business as a "learning network" in which 200 investors—made up of CEOs, entrepreneurs and hedge-funders, among other professionals—collectively manage more than $20 billion in assets. The firm's investors carry a median net worth of $75 million. So where do Sonnenfeldt's investors see the best opportunity in 2014, at least for super-wealthy investors?
"The big story for our members is private equity," Sonnenfeldt said Tuesday on "Squawk on the Street." "Since 2008, all of the growth in our equity exposures has been private equity."
(Read more: 'Things are not cheap,' says Rubenstein)