The Securities and Exchange Commission put faces to its lawsuit against individuals accused of insider trading in the sale of TXU, the largest ever buyout, by charging a British couple with trading on non-public information.

On Wednesday, a federal court in Chicago froze the assets of husband and wife Seema and Sunil Sehgal. The couple is alleged to have bought 700 TXU call options ahead of the February 26 announcement of TXU's buyout by Kohlberg Kravis Roberts and Texas Pacific Group.