Bill Gates privately said he had donated about $50 million to a nonprofit organization supporting Kamala Harris, the New York Times reported, citing three people briefed on the matter.
The Microsoft co-founder's donation to Future Forward, the main outside fundraising group for Harris, was meant to stay under-wraps, the outlet reported.
Gates has not publicly endorsed a presidential candidate in the past, but had previously praised Harris when she became the Democratic nominee, saying that it was "great" there was somebody younger running.
The NYT, citing a private phone call, said that Gates has expressed reservations about a Trump presidency, but shared that he would work with either candidate.
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The outlet reported that Gates had talked about his pro-Harris donation with Mike Bloomberg, a former New York City mayor, who had considered a similarly sized gift.
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The donation from Gates comes after a Forbes analysis found 81 billionaires are backing Harris, compared to the 50 billionaires supporting Trump.
Harris boasts supporters include LinkedIn co-founder Reid Hoffman and Atlanta Falcons owner Arthur Blank.
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Trump's backers include Tesla CEO Elon Musk and hedge fund manager Bill Ackman.
FOX Business has reached out to the Gates Foundation and Future Forward for comment.