The billionaire behind Equinox and SoulCycle — playgrounds for New York’s liberal elite — is a major President Trump supporter who is throwing him a Hamptons fundraiser this Friday.

News of Stephen Ross’ pro-Trump leanings led to a furious reaction Wednesday from left-leaning lovers of the popular clubs — and caused the company to be inundated with canceled memberships, a source told Page Six.

Ross is the chairman of Related Companies, which is the parent company of both Equinox and Soul Cycle. Tickets for his Trump fundraiser event range from $5,600 to $250,000 according to the Washington Post.

Attendees who pay top dollar will get a lunch, a photo and private roundtable conversation with Trump.

Both Soul Cycle and Equinox, however, have developed a customer base filled with the kind of young urban professionals who are not usually counted among Trump’s base.

Equinox, for instance, has recently been lauded for its support of causes such as the “Life’s a Ball” pride campaign, which in June honored the transgender community.

Activist and actor Wilson Cruz launched a Change.org campaign and wrote, “We joined this gym because we believed it shared our values. We believed it was a safe space for people like us.”

He added: “There is no way that we as a community can continue to support this business if you are actively supporting an administration that puts us in danger and works towards treating us like second class citizens, and worse yet, subhuman.”

In a statement, Ross said he said he has always been an “active participant in the democratic process.”

“I have known Donald Trump for 40 years,” Ross added. “…and while we agree on some issues, we strongly disagree on many others and I have never been bashful about expressing my opinions.”

Equinox just opened a luxury hotel at the flashy new Hudson Yards complex on the West Side.

Equinox and SoulCycle said in a statement, “Neither Equinox nor SoulCycle have anything to do with the event later this week and do not support it. As is consistent with our policies, no company profits are used to fund politicians. We are committed to all our members and communities we live in. We believe in tolerance and equality, and will always stay true to those values. Mr. Ross is a passive investor and is not involved in the management of either business.”

Meanwhile, critics also appeared to have gotten to the Wikipedia page for Ross, who also owns the Miami Dolphins.

His bio on the site briefly read, “Stephen M. Ross (born May 10, 1940) is an American real estate developer, right wing person of very low intelligence, pretend philanthropist (because giving money to right wing causes does not count as charity) and sports team owner.”