After a trio of new settlements, investors have now inked deals worth $475.5 million with private equity firms accused of scheming to drive down the value of major leveraged buyout deals. But one defendant remains—Carlyle Group LP—and its lawyers at Latham & Watkins have shown no signs of surrender ahead of a looming trial this fall.

In a motion filed Thursday, plaintiffs lawyers at Robins Kaplan Miller & Ciresi, Scott & Scott and Robbins Geller Rudman & Dowd urged a federal judge in Boston to approve a combined $325 million in fresh settlements with Blackstone Group LP, Kohlberg Kravis Roberts & Co. and TPG Capital LP. Those deals follow earlier settlements with Bain Capital Partners LLC ($54 million), Goldman Sachs Group Inc. ($67 million) and Silver Lake Technology Management LLC ($29.5 million).