Jan 6 (Reuters) - Buyout firm Hg Capital has agreed to acquire financial software maker OneStream in an all-cash deal worth $6.4 billion, the ​company said on Tuesday, less than two years after its Nasdaq ‌debut. Shareholders will receive$24 a share in cash, representing a 31% premium to OneStream's closing price ‌on Monday. The stock jumped more than 28% in afternoon trading. Global mergers and acquisitions activity showed a steady rebound in 2025, extending a gradual recovery despite uncertainty over ...