KKR will buy a joint venture of S&P Global and CME Group in a $3.1 billion deal, marking the U.S. private equity firm's second acquisition in less than a week despite the tariff turmoil slowing the pace of dealmaking activity.

The proceeds from the deal to sell London-based OSTTRA, which provides post-trade services across interest rate, foreign exchange, equity and credit asset classes, will be divided evenly between financial data provider S&P Global and derivatives marketplace CME, they said on Monday.

"Clearly KKR is playing the long game here buying OSTTRA and not letting the current volatile environment stop them from acquiring a high-quality asset at a reasonable price from their perspective," Huber Research Partners analyst Craig Huber said.

With KKR's support, "we will further accelerate our strategic initiatives" to enhance post-trade offerings and "expand our global footprint", OSTTRA co-CEOs Guy Rowcliffe and John Stewart said.

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