JPMorgan Chase on Friday flatly denied that its CEO, Jamie Dimon, has endorsed Donald Trump for president, minutes after the Republican nominee claimed on social media that Dimon is now backing him.

“Jamie Dimon has not endorsed anyone. He has not endorsed a candidate,” Dimon spokesman Joe Evangelisti told CNBC in a phone call.

Trump on Truth Social had posted a screenshot falsely claiming, “New: Jamie Dimon, the CEO of JPMorgan Chase, has endorsed Trump for President.”

The claim appears to have originated from a verified account on X earlier Friday. It was quickly amplified on social media by other pro-Trump accounts, and then the former president himself, before the bank issued its denial.

When NBC News asked Trump about the post later Friday, Trump said he did not know about it and that it was not posted by him.

“Somebody put it up,” Trump said, adding, “I don’t know.”

The post, published at 1:56 p.m. ET, was still visible on Trump’s official account more than two hours later.

The Trump campaign did not respond to CNBC’s requests for comment.

In September, Dimon said that he is not backing either Trump or Democratic nominee Kamala Harris.

“I’m not endorsing anyone at this time,” Dimon told CNBCTV-18 at the JPMorgan Investor Summit in Mumbai.

Dimon has at times offered qualified praise for Trump, but the two men have also clashed repeatedly over the years.

During the Republican presidential primary season, Dimon had urged corporate leaders to support former South Carolina Gov. Nikki Haley over Trump.

Trump tore into Dimon for siding with Haley, saying he “had to live with this guy when he came begging to the White House.”

— NBC News’ Jake Traylor contributed reporting.