Aditya Mittal in line to become alternate governor of Celtics as part of Bill Chisholm’s ownership group

Aditya Mittal, CEO of global steel giant ArcelorMittal, is in line to become the alternate governor of the Celtics following a $1 billion investment as part of Bill Chisholm’s ownership group, according to a source familiar with the transaction.

Mittal is expected to eventually become the second-largest stakeholder after Chisholm, with private equity firm Sixth Street, which will be a silent partner, holding the third-largest stake, the source said.

When Chisholm’s $6.1 billion bid was accepted by the Grousbeck family in March, the offer was not fully financed. But the source said that Mittal was recruited by Chisholm and current lead governor Wyc Grousbeck as the sale process unfolded.

“Aditya has long been a huge supporter of the Boston Celtics, and when Wyc and Bill approached Aditya he saw it as a tremendous opportunity to get involved with this incredible team,” a spokesperson for Mittal said in an emailed statement. “Obviously, he remains super focused on ArcelorMittal and also very much looks forward to supporting the team further.”

Last week, Chisholm obtained sufficient commitments to purchase the Celtics and his ownership group was finalized, according to a letter sent to existing shareholders.

The deal will become official after it is approved by the NBA’s board of governors, a formality likely to occur in June or July. Chisholm’s group will purchase 51 percent of the team at that time, with Grousbeck remaining lead governor until the balance closes after the 2027-28 season.

Mittal is a member of one of India’s richest families and the son of Lakshmi Mittal, who founded ArcelorMittal and remains executive chairman.

Aditya Mittal graduated from the University of Pennsylvania’s Wharton School and lives in London. According to the ArcelorMittal website, Aditya Mittal also is a member of Harvard’s Global Advisory Council.

The new ownership group also is expected to include real estate executive Bruce Beal Jr., as well as telecommunications executive Robert Hale, a member of the previous group whose stake is increasing.