S&P Global and CME Group have sold OSTTRA, a post-trade solutions provider, to KKR for $3.1 billion.OSTTRA offers post-trade offerings across interest rates, FX, credit, and equity asset classes.OSTTRA's management team will continue to lead the company, and KKR plans to increase investments in technology and innovation.The transaction is expected to close in the second half of 2025, subject to regulatory approvals.