Most of Clinton's CEO supporters gave to her campaign committee, with an average donation of $2,300, a little less than the $2,700 maximum. Republican candidates tend to receive much larger donations to their super PACs from smaller groups of CEOs, and Bush's Right to Rise USA super PAC has received the largest amount this year from CEOs, nearly $15 million.



CEOs showed little interest in real-life CEOs Carly Fiorina and Donald Trump. And while Cruz and Mike Huckabee have received respectable amounts from fewer than 150 CEOs donating large amounts to their super PACs, more than 60 percent of CEOs identified in filings are pulling for either Bush or Clinton.

Among her supporters, Clinton counts Bob Iger of Disney, Drew Houston of Dropbox and Ursula Burns of Xerox. None of her CEO supporters have given to Republicans this year. Bush's approximately 550 supporters — about equally split between his campaign committee and super PAC — are CEOs like Steve Schwarzman of Blackstone, Roger Penske of Penske and Bob McNair of the Houston Texans.

Of course, those numbers don't include CEOs who don't identify themselves as such when donating — including huge donors such as hedge fund management firm CEO Robert Mercer, who tends to say he's a "financial advisor" or "financial consultant" in filings. We also excluded donations to candidates who have already dropped out — like the millions Rick Perry received but had to give back.