FSG was founded in 2001 as New England Sports Ventures (NESV) when John W. Henry joined forces with Tom Werner, Les Otten, The New York Times Company and other investors to successfully bid for the Red Sox.

[3] In 2021, FSG was embroiled in a controversy over its attempts, together with the ownership groups of eleven other soccer clubs, to create a European Super League.

In doing so, FSG sought to emulate elements of the North American sports model, creating a competition with strictly limited entry beyond a proposed 15 founding member clubs and appearing to largely eliminate the European system of meritocratic promotion and relegation.

Principal owner John W. Henry later issued an apology in which he took sole responsibility for the club's involvement in the venture, which subsequently collapsed.

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 21st century.

[13] Fenway South is the spring training base of the Boston Red Sox in Fort Myers, Florida.

[22] When the Intellectual Property Office refused the application because of the "geographical significance" of the name, a spokesman for SOS underlined that the name "belongs to the city of Liverpool and its people.

The proposed league would take the place of UEFA competitions in the soccer calendar following a similar format of midweek fixtures followed by knockout rounds, albeit with a selective membership.

[26] On November 29, 2021, FSG announced its intent to purchase a controlling stake in the Pittsburgh Penguins of the National Hockey League.

[31] In December 2007, Fenway Sports Group agreed to purchase the Salem Avalanche of the Carolina League, Single A Advanced affiliate of the Houston Astros with the anticipation of converting the team to a Boston-affiliated club.

In 2009, the Salem, Virginia-based team adopted the Red Sox moniker, including a logo and color scheme to match their parent club.

It styles itself as a "new kind of sports marketing agency", created by FSG to expand its footprint beyond its most famous holdings, the Boston Red Sox of Major League Baseball and Fenway Park.

[38] 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.

[41] Partners in Fenway Sports Group LLC as of April 2, 2024 include:[41][42] Ed Weiss is listed as executive vice president/corporate strategy and general counsel[42] and Julie Swinehart as chief financial officer.