A €3 billion acquisition by ratings agency Moody’s has handed a small UK advisory firm one of its largest M&A mandates yet on a knockout day for dealmaking.

Moody’s Corporation said in a statement on Monday that it would pay €3 billion ($3.3 billion) for Bureau van Dijk, a Dutch company that deals in information about private companies. Bureau van Dijk is being sold by one of private equity firm EQT’s funds.