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William Blair Expands Investment Banking Platform with Acquisition of Armentum Partners

Business Wire

Move deepens firm's focus on the venture capital ecosystem and adds differentiated capital solutions for high-growth companies

CHICAGO, October 19, 2026--William Blair today announced it has acquired Armentum Partners, a premier boutique debt and alternative capital solutions advisory firm serving venture-backed businesses, public companies, and academic institutions.

The transaction marks William Blair's second investment banking acquisition of the year and underscores the firm's continued investment in key growth areas including healthcare, technology, and the venture capital ecosystem. It broadens William Blair's capital markets and debt advisory solutions, adding an enterprise value and asset-based lending and royalty monetization capability.

Founded on expertise in the healthcare and technology sectors, Armentum Partners advises companies with high-growth potential on bespoke capital solutions. Leveraging deep venture capital and public company relationships, and longstanding access to growth-focused and enterprise-value lenders, the firm has a track record of delivering tailored financing and seamless execution for clients. Armentum Partners also advises academic institutions and life sciences companies on royalty monetization, helping them to capitalize on intellectual property.

The firm includes professionals in Boston, Chicago, Menlo Park, New York, Philadelphia, and San Francisco, serving clients in the U.S. as well as Europe. As part of the transaction, William Blair will open an office in Menlo Park, establishing a presence in the heart of Silicon Valley in addition to William Blair's existing strategic footprint.

All Armentum Partners professionals have joined William Blair as part of the transaction, preserving their deep relationships and specialized expertise.

"We continue to invest in capabilities and teammates who can provide differentiated outcomes for our clients across the venture capital, public company, and collegiate communities," said Matt Zimmer, global head of investment banking at William Blair. "The Armentum Partners team has decades of experience earning the trust of their clients, key investors and lenders in their markets, and the institutions and universities that fuel innovation. Together, we can offer these clients a broader set of solutions to finance their continued growth."

"This is a natural synergistic extension of our capital markets strategy," said Steve Maletzky, head of capital markets at William Blair. "Enterprise value lending is a specialized discipline—financing companies against the value of their assets, often before traditional cash flows exist. Armentum Partners has built a leading franchise advising many of the most well-known and innovative public companies, universities and venture-backed businesses."

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