All of the billionaire donors were contacted for comment and most didn’t respond or declined to comment. Representatives for Geffen, Soros and Dustin Moskovitz confirmed their donation amounts and declined to comment further.

“Mr. Hamm has given more” to Trump than FEC disclosures to date show, Kristin Thomas, a spokeswoman, said in an e-mail. She declined to specify Hamm’s contribution amount.

The survey looks at FEC disclosures through Sept. 20 and includes donations made to the candidates, joint fundraising committees and super-PACs since the start of 2015. The data exclude money given to national parties, PACs not specifically aligned with the candidates, and money given to other down-ticket candidates and causes. The FEC information doesn’t include donations made to the campaigns after the end of August. Some groups file disclosures quarterly, so information is included only through the end of June.

The analysis also excludes billionaire donors who are not on the Bloomberg index, which ranks the world’s 400 richest people. Thomas Barrack, Jay Pritzker and Haim Saban have given millions of dollars to the campaigns. Many of the billionaires included in the analysis could also be giving to nonprofit groups that have no obligation to disclose who funds them. Renaissance Technologies co-founder Robert Mercer has set up a pro-Trump group and seeded it with $2 million, while this month Joseph Ricketts revealed plans to support Trump primarily through similar vehicles.

Facebook billionaire Moskovitz and his wife, Cari Tuna, have pledged $20 million to Democratic groups, including the Hillary Victory Fund and progressive activist group MoveOn.org. New York grocery magnate John Catsimatidis has given to both Trump and Clinton.

This article was provided by Bloomberg News.

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