Employee-owned William Blair, with roughly 2,000 staff and $850 billion in completed transaction volume since 2021, is buying 16-person Inner Circle Sports — whose 24-year track record spans more than 70 team sports transactions — while allowing it to retain its name, co-founders, and day-to-day independence.
Investment bank William Blair (Chicago) has entered into a definitive agreement to acquire Inner Circle Sports (ICS; New York), a boutique investment bank with a specialty in sports and staff of 16. The deal is subject to customary closing conditions and regulatory approval, and its terms are undisclosed.
According to Sportico, the deal should close by Q2, Blair will be placing the ICS staff under its umbrella, co-founders Rob Tilliss and Steve Horowitz will retain day-to-day control of ICS, and ICS will continue to operate under its own name.
The ICS acquisition appears to be Blair’s entry into the market for sports. Employee-owned and staffed by about 2,000 people, Blair splits its business between investment banking, investment management and private-wealth management. The first of these divisions employs a staff of about 650 and closed about 200 M&A deals last year. It says its completed transaction volume from January 2021 to December 2025 amounted to $850 billion.
Sports M&A is Inner Circle’s bread and butter. Over its 24-year history the firm has advised on more than 70 transactions relating to team sports and such “adjacent sectors” as “software, data, content, and media services,” as its website reads. Its services cover “the full lifecycle of sports investment – from buy-side and sell-side M&A to private equity fundraising, minority ownership transactions, and independent franchise valuations.” Its clients “include a global network of institutional investors, private equity firms, lenders, family offices, team owners, and operating companies across the sports, media, technology, and entertainment sectors.”
The ICS maintains on its website a list of the deals it has advised on. They have involved: Fenway Sports Group, the Milwaukee Bucks, the San Francisco 49ers, the Tampa Bay Lightning, Orlando City SC, Orlando Pride, Wrexham A.F.C., the Minnesota Timberwolves, the Co-op Live arena (Manchester), Nashville’s domed NFL stadium and Huntington Bank Field (Cleveland).
