Vince McMahon’s World Wrestling Entertainment has agreed to merge with UFC to form a new publicly traded company controlled by Endeavor Group, the companies announced Monday morning.

Endeavor will own a 51% stake in the new combat sports and entertainment company, while WWE shareholders will have the remaining 49%, according to the terms of the agreement. The deal values WWE at $9.3 billion and UFC, which is owned by Endeavor, at $12.1 billion, the companies said in a news release.

Shares of WWE fell in premarket trading, while Endeavor shares rose.

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Ari Emanuel will be CEO of both Endeavor and the new company, the companies said. McMahon will be executive chairman, while Endeavor President and Chief Operating Officer Mark Shapiro will also work in the same roles at the new company. Dana White will remain as president of UFC, and WWE CEO Nick Khan will stay on as president of the wrestling business.

The board will consist of 11 people, six appointed by Endeavor and five by WWE. The merged company’s name will be announced later.

The announcement confirmed a CNBC report. It also came a day after WWE wrapped up its flagship live event, WrestleMania, in California. The company has spent the past several months looking for a buyer; McMahon returned to the company as chairman in January to oversee the process. Shares of WWE are up by more than 33% this year as of Friday’s closing bell, giving it a market value of more than $6.79 billion.

The agreement would pair two of the biggest sports entertainment brands in the world. Despite notable differences — WWE features scripted matches and soap opera-like storylines, while UFC showcases authentically brutal mixed martial arts fighting — the organizations look like a good fit in terms of content and culture. Several UFC fighters, including Ronda Rousey and Brock Lesnar, have already wrestled for WWE.

UFC champion and superstar Conor McGregor lauded the news Sunday evening. “Incredible. What a powerhouse!” he said in a tweet, following up with another tweet displaying an image of him brandishing UFC and WWE championship belts.

A merger will also conclude WWE’s decades as a family business. McMahon’s father founded WWE in its original incarnation in the middle of the 20th century. McMahon, who bought the company from his father in 1982, is the controlling shareholder. Over the past four decades, WWE has grown into a global phenomenon, spawning breakout stars such as Hulk Hogan, Dwayne “The Rock” Johnson, Dave Bautista and John Cena.

McMahon, 77, retired from the company in July following a string of revelations that he paid several women millions of dollars over the years to keep quiet about alleged affairs and misconduct. His daughter, Stephanie McMahon, became co-CEO alongside Khan. Paul Levesque, who’s both Stephanie McMahon’s husband and the wrestler known as Triple H, took over creative duties from Vince McMahon.

After Vince McMahon came back in January, Stephanie McMahon stepped down and Khan fully assumed the CEO role. The elder McMahon recently locked in a two-year employment contract, according to a securities filing.

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Khan in recent weeks has been making the media rounds to discuss the potential sale. He told CNBC’s Morgan Brennan on Thursday that it has been a robust process and that it has drawn many interested buyers.

WWE offers Endeavor’s shareholders a muscular media and live events business, as well as decades worth of intellectual property. The company generated $1.29 billion in revenue last year, driven mainly by its $1 billion media unit.

UFC, meanwhile, has paid off for Endeavor. Last year, the MMA league helped its parent company’s sports business make $1.3 billion in revenue. Endeavor’s market cap stood at about $10.53 billion as of Friday’s close.

WWE also fits well with the cultures of Endeavor and UFC, which also reflect their leaders’ hard-edged styles. McMahon, Emanuel and White are known for their outsized personalities, and each has their share of devoted allies and and harsh critics.