Last week, more than 40 of the world's wealthiest people indicated that they are donating at least half of their net worth to charity as part of the Giving Pledge, started by billionaires Bill Gates, Melinda Gates, and Warren Buffett. Yet some of Wall Street's richest have yet to participate.

So Bookmaker.com's chief executive, Mickey Richardson, and his team have calculated the odds of the next Wall Street billionaire most likely put his or her name down. It turns out the highest odds go to John Paulson, a hedge-fund manager, with an 11.8 percent chance.

Here are other top contenders:

• Carl Icahn, American financier and private-equity investor, 11.1 percent
• George Soros, stock investor and philanthropist, 10.5 percent
• Peter Thiel, hedge-fund manager and venture capitalist, 9.10 percent
• Marc Lasry, hedge-fund manager, 9.10 percent
• Steve Mandel Jr., hedge-fund manager, 8.3 percent
• ...