William Blair has agreed to acquire Inner Circle Sports, the New York City‑based boutique focused on sports, media and entertainment. The deal keeps the Inner Circle Sports name in use for the foreseeable future.

Founded in 2002 by Rob Tilliss and Steve Horowitz, the firm has carved a niche as a specialist investment bank for high‑profile sports assets. William Blair’s move signals its intent to deepen its presence in the lucrative sports‑finance sector.

Financial terms were not disclosed, but the acquisition adds a seasoned deal‑maker to William Blair’s roster and expands its service offering to a client base that spans athletes, teams and media companies.

For investors, the transaction underscores a broader trend of consolidation in niche investment banking, as larger firms absorb specialized boutiques to capture growing demand for tailored advisory in the sports and entertainment markets.