Hg completed its acquisition of OneStream for $6.4 billion in an all-cash transaction, the companies announced. OneStream shareholders received $24.00 per share in cash as part of the deal.

OneStream's Class A common stock ceased trading on NASDAQ following completion of the transaction. The enterprise finance management platform company is now privately held, with Tom Shea continuing as CEO and the existing leadership team remaining in place.

The acquisition was backed by minority investors General Atlantic and Tidemark. OneStream shareholders and regulatory authorities had previously approved the transaction.

"Following an exceptional year of growth, including more than doubling our AI customers year over year in 2025, today's news marks an exciting next step for OneStream," said Tom Shea, founder and CEO of OneStream.

Hg partner Joe Jefferies stated the firm sees opportunity in OneStream's position in finance AI solutions. "OneStream's powerful Finance AI differentiation brings AI and Agentic AI solutions to a company's contextualized business logic, making it a key player in the Finance AI sector," Jefferies said.

OneStream operates a cloud-based platform that unifies financial and operational data for enterprise finance teams. The company reports having over 1,800 customers, including 18% of the Fortune 500 companies, and employs approximately 1,600 people.

Hg manages over $110 billion in assets under management and maintains a portfolio of around 60 businesses worth more than $195 billion in aggregate enterprise value. The London-based investment firm focuses on European and transatlantic technology and services businesses.

J.P. Morgan Securities served as financial advisor to OneStream, while Goldman Sachs advised Hg on the transaction.