The Boston Red Sox are a professional baseball team based in Boston, Massachusetts and a member of the Major League Baseball’s American League Eastern Division. Founded in 1901 as one of the American League's eight charter franchises, the Red Sox's home ballpark has been Fenway Park since 1912. The "Red Sox" name was chosen by the team owner, John I. Taylor, around 1908, following previous Boston teams that had been known as the "Red Stockings." Boston was a dominant team in the new league, defeating the Pittsburgh Pirates in the first World Series in 1903 and winning four more championships by 1918.

In 2002, the Red Sox were sold by the Yawkey Trust to Fenway Sports Group. They had endured one of the longest championship droughts in baseball history, called by some the "Curse of the Bambino" after its alleged beginning with the Red Sox's sale of Babe Ruth to the rival Yankees in 1919, an 86-year wait before the team's sixth World Championship in 2004. Red Sox history has also been marked by the team's intense rivalry with the New York Yankees, arguably the fiercest and most historic in North American professional sports. Since 2003, the Red Sox have been perennial playoff contenders and have won four World Series, emerging as one of the most successful major league baseball teams of the last decade. Ownership has recently taken more interest in outside ventures as the Red Sox payroll is now among the middle of the league.
Fenway Park is a baseball park near Kenmore Square in Boston, Massachusetts. Located at 4 Jersey Street, it has served as the home ballpark of the Boston Red Sox baseball club since it opened in 1912 and is the oldest Major League Baseball stadium currently in use. It is, along with Chicago's Wrigley Field, one of the pair of the original "jewel box" standard ballparks that are still in use. Considered to be one of the best-known sports venues in the U.S., Fenway Park became the oldest venue used by a professional sports team in the United States in 1999 when the Detroit Tigers moved out of Tiger Stadium which opened the same day as Fenway Park.
Fenway South is the spring training base of the Boston Red Sox in Fort Myers, Florida. The purpose-built training and player development complex is used year-round by the Red Sox and its minor league farm teams—Worcester Red Sox, Portland Sea Dogs, Greenville Drive, and Salem Red Sox—and includes an 11,000-seat stadium and an additional six baseball fields together with training and medical facilities. As the spring training home of Red Sox, it replaced the nearby City of Palms Park. The stadium within Fenway South is called JetBlue Park, through sponsorship by JetBlue, which has maintained major operations at Boston's Logan International Airport since 2004.
Having previously partnered with the English club Fulham, on October 6, 2010, FSG agreed to buy Liverpool from owners George N. Gillett, Jr. and Tom Hicks, after the board voted 3–2 to oust them from the club. It purchased through a subsidiary, "N.E.S.V. I, LLC" (incorporated in Delaware) and UK based holding company "UKSV Holdings Company Limited." Liverpool won the 2018–19 UEFA Champions League, having finished runners-up in the previous year's competition. They also won the 2019–20 Premier League.

In 2019, FSG was criticized for a failed attempt by Liverpool to trademark the name "Liverpool". The supporters' group Spirit of Shankly (SOS) campaigned against the move. When the Intellectual Property Office refused the application because of the "geographical significance" of the name, a spokesman for SO…

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John W. Henry is the principal owner, holding an estimated 40 percent of the stock in FSG. Chairman Tom Werner controls the second-largest block of shares. The Boston Globe (owned by Henry) reported in March 2021 that RedBird Capital Partners, a New York private investment firm, had acquired a $750 million stake in Fenway Sports Group to become its third-largest partner, with Boston-based asset manager Michael S. Gordon, president of FSG, holding the fourth-largest share. On March 31, 2021, FSG officially announced that NBA superstar LeBron James and his longtime business partners, Maverick Carter and Paul Wachter – along with Boston Red Sox CEO Sam Kennedy — had also acquired partnerships in FSG.

Partners in Fenway Sports Group LLC as of April 2, 2024 include:
• Theodore Alfond
• William Alfond
• Arctos Partners
• Maverick Carter
• Thomas R. DiBenedetto
• Michael J. Egan (Director, Liverpool)
• Patrick Egan
• Theo Epstein
• Chris Fillo
• David Ginsberg (Vice chairman)
• Michael S. Gordon (President, FSG; director, Liverpool)
• John W. Henry (Principal owner)
• Linda P. Henry
• Jimmy Iovine
• Mitchell Jacobson
• LeBron James
• Gary Kaneb
• Sam Kennedy (CEO, FSG; president/CEO, Boston Red Sox)
• Seth Klarman
• Larry Lucchino (Deceased, April 2, 2024)
• Henry F. McCance
• Phillip H. Morse (Vice chairman)
• Michael Pucker
• Bruce Rauner
• RedBird Capital Partners
• Frank M. Resnek

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• Official website
• Boston Red Sox website
• Liverpool F.C. website
• Pittsburgh Penguins website
• RFK Racing website
• NESN website