William Blair Acquires Armentum Partners, Adding Debt Advisory and Royalty Monetization

William Blair has acquired Armentum Partners, a boutique advisory firm specializing in debt financing, alternative capital solutions and royalty monetization, the company said. Financial terms of the transaction were not disclosed. The acquisition marks William Blair's second investment banking transaction of 2026, according to citybiz.

William Blair is an independent, employee-owned global financial services firm founded in 1935 that offers investment banking, investment management, private wealth management, equities and equity research across more than 30 offices, according to akta.pro company records. Armentum Partners advises venture-backed companies, publicly traded businesses and academic institutions on specialized financing arrangements, including enterprise value lending, asset-based financing and royalty monetization.

William Blair's Second Investment Banking Deal of 2026

All Armentum Partners professionals have joined William Blair as part of the transaction, maintaining their client relationships and specialized expertise. William Blair will also establish a new office in Menlo Park, California, expanding its presence in Silicon Valley. Armentum has professionals in Boston, Chicago, Menlo Park, New York, Philadelphia and San Francisco, serving clients across the United States and Europe.

Matt Zimmer, Global Head of Investment Banking at William Blair, said the acquisition supports the firm's strategy of expanding its services for innovative companies and institutions. "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," Zimmer said. "Together, we can offer these clients a broader set of solutions to finance their continued growth."

Steve Maletzky, Head of Capital Markets at William Blair, described the acquisition as an extension of the firm's existing financing strategy. "This is a natural synergistic extension of our capital markets strategy," Maletzky said. "Enterprise value lending is a specialized discipline—financing companies against the value of their assets, often before traditional cash flows exist."

Hutch Corbett of Armentum Partners said joining William Blair will provide clients with access to a broader range of financial advisory and capital raising services. "Joining William Blair unlocks opportunities for our clients, providing the increased scale, reach, and sector depth of a premier global platform along with relationship and execution continuity," Corbett said.

Armentum Partners will continue operating under its existing name for a period following the transaction's closing. The companies did not specify when the Armentum brand will be fully integrated into William Blair or provide details regarding future organizational changes. Clearsight Advisors served as financial advisor to Armentum Partners in connection with the acquisition.

Armentum's Transaction Record and William Blair's Scale

Armentum has raised more than $22 billion since its inception across more than 390 transactions, according to the company. Its senior bankers collectively bring more than 200 years of experience across investment banking, commercial lending, venture financing, private and public equity investing, and business development. William Blair's investment banking group operates across more than 20 cities on four continents, and from July 2021 through June 2026 it advised on more than $880 billion in completed transaction volume.

William Blair's Recent Life Sciences and ETF Moves

William Blair added Emanuela Branchetti as managing director and head of scientific affairs for its biopharma investment banking team, FinancialContent Business Page reported in October 2026. She joined from Truist Securities, bringing over 20 years of biopharma experience. William Blair Investment Management launched its first two actively managed ETFs, WBEM and WBIE, trading on the NYSE, Business Wire Blog reported in October 2026. The firm managed $19.8 billion in emerging markets equities and $18.5 billion in international equities as of June 30, 2026.