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Kevin Hart has heard warnings about the streaming industry that have rocked Hollywood ever since Netflix revealed last week that it had lost subscribers in recent months.

But Mr. Hart, a prolific actor and comedian, doesn’t buy into that.

“There are too many different entities, too many different platforms, too many different places where the world of content can freeze,” Mr. Hart said in an interview from Belfast, Northern Ireland, where he is filming for Netflix. “Anyway, it’s now reinforced.”

Mr. Hart has a big supporter of his thesis. Hart’s media company, HartBeat, said Tuesday it has raised $100 million from Abry Partners, a private equity firm in Boston. Abry is buying a 15 percent stake in HartBeat, people with knowledge of the deal said, valuing the company at more than $650 million.

The deal makes Mr. Hart the latest entertainment entrepreneur to use private investment money that is being distributed throughout Hollywood. Last year, Reese Witherspoon, LeBron James and Will Smith sold stakes in their media businesses to firms looking to cash in on increased demand for content.

Valuations rose in part due to interest from firms. Hello Sunshine, the company founded by Ms. Witherspoon, has been valued at nearly $1 billion in a deal with Candle Media, a new company backed by private equity firm Blackstone. Moonbug Entertainment, owner of the popular children’s show CoComelon, has been valued at nearly $3 billion in a deal with Candle Media.

Michael Nathanson, an industry analyst, said production contracts with established artists will become more common as streamers focus on profitability. Media companies want shows and movies to have the best chance of attracting new subscribers, he says, and name recognition is a surefire way to achieve that.

“The only way to get rid of the clutter is with quality or famous brands,” Mr. Nathanson said.

HartBeat is a new comedy and cultural content company created from the merger of two firms associated with Mr. Hart: Laugh Out Loud, a digital comedy firm that was conceived in 2016 as a subscription streaming service by Lionsgate and Mr. . Hart and HartBeat Productions, Mr. Hart’s production company.

Hart, who controls HartBeat, steps down as chief executive but remains chairman of the board. He will be replaced by Ty Randolph, who was COO of Laugh Out Loud and HartBeat Productions. Jeff Clanagan, Mr. Hart’s longtime business partner, will be the company’s director of distribution, and Brian Smiley, president of film and television at HartBeat Productions, will be HartBeat’s director of content.

Streaming service Peacock NBCUniversal, which has a deal that gives it its first chance to buy TV shows produced by HartBeat, will continue to be a minority investor in the combined company. HartBeat executives will also own shares.

Abry Partners did not respond to a request for comment.

Ms. Randolph said that both HartBeat Productions and Laugh Out Loud were profitable before the merger, but declined to give details. More than 50 percent of HartBeat’s revenue will come from his studio, which has contracts to make shows for streamers like Peacock and Netflix. (Past productions have included Olympic Moments, a live coverage of the Summer Games, and Fatherhood, a Netflix film in which Mr. Hart plays a grieving father.) Licensing and brand advisory services for companies such as Procter & Gamble, Lyft and Sam’s Club.

Discussions about the merger began in earnest during a July retreat in Los Cabos, Mexico, where about 60 employees from both companies got to know each other after months of working remotely during the Covid-19 pandemic, Ms Randolph said. In a hotel room near the beach, the executives devised a combined company structure that included a reshuffling of senior management.

Mr. Hart predicted that competition between streaming services would result in several big players vying for subscribers in the market, each offering different content. He drew comparisons to the sportswear industry, where established companies like Nike continue to grow. As long as HartBeat provides good shows, he says, he will exist.

“There will never be a time when people don’t want to laugh, they don’t need to drop their shoulders and just have a good time,” Mr. Hart said.