Linda Pizzuti Henry owns a piece of the Red Sox.

In a transaction made late last summer, Pizzuti Henry, the wife of principal owner John W. Henry, acquired a portion of the shares held by former Fenway Sports Group limited partner Arthur Nicholas.

Pizzuti Henry becomes the first woman to own at least a share of the Sox since the death of Jean Yawkey in 1992. Yawkey took control of the team in 1976, when her husband, Tom, died.

Since her marriage to John Henry in 2009, Pizzuti Henry has played an active role with the Red Sox and at Fenway Park. She was the creative force behind Fenway Farms, Tessie the Green Monster and shows for NESN, plus she is the managing director at the Boston Globe, which is also owned by her husband. She works with several foundations, including the Red Sox and Boston Globe foundations, and she is active behind the scenes with the Liverpool Football Club of soccer’s English Premier League.

A creator of HUBweek in Boston, Pizzuti Henry has also been an advocate for women entering and thriving in the business world.

“It’s an important moment for the Red Sox,” team CEO and president Sam Kennedy said yesterday. “It’s a great thing, one, for the Red Sox to have a woman owner, and two, she has become an absolute force in the city of Boston. She’s passionate about the city of Boston, she’s passionate about connecting with the next generation in terms of technology and content, and she’s a force. Many of our senior level women executives have worked with her, she’s gathered women executives from different industries to speak about leadership and technology. It’s a very important moment for the Red Sox.”

Kennedy classified her portion shares as a “small interest.”

Fenway Sports Group is the holding company for not only the Red Sox, but also Liverpool FC, NESN, Fenway Park, Fenway Sports Management and Roush Racing.

Including John Henry and Tom Werner, who are the day-to-day managers and hold decision-making authority at FSG, there are 19 investors in all. John Henry holds the largest share, estimated at 40 percent, with Werner and Michael Gordon the next largest shareholders.

Kennedy explained, in broad strokes, how the ownership group works.

“John Henry and Tom Werner are the owners and managers of the entity, and, along with FSG president Michael Gordon, they run the owners’ meetings and have decision-making authority over all of the businesses,” Kennedy said. “I report to John and Tom. They’re the managing, day-to-day owners. The other investors, people like Frank Resnek, Marty Trust, Phillip Morse and now Linda Henry, they are investors. So, they don’t have an active role in the day-to-day operations.”

Considering Pizzuti Henry became an owner nearly half a year ago, without any notice or fanfare from the company, her active role with the ballclub is not expected to change after gaining a seat at the owners’ table.

“Linda is obviously family and she, for many years, has had a big impact on Fenway Sports Group and specifically the Red Sox,” Kennedy said. “She’s very passionate about connecting kids and children to baseball and sports in general. I’m not as familiar with it, but she’s had a very similar impact over at Liverpool with respect to kids and youth marketing initiatives. So she has been active and involved with the Red Sox for many years. She’s been a part of the Red Sox family, literally and spiritually, for a long time.”

Pizzuti Henry is a native of Lynnfield and holds a bachelor’s degree from Babson and a master’s degree from MIT.

Female ownership in baseball is not a new phenomenon, although among the 30 current teams it is rare. The Yankees have three female members of the Steinbrenner family in an ownership capacity while Laura Ricketts is a co-owner of the Chicago Cubs.