Plaintiffs in a 2-year-old Houston state court lawsuit against Philadelphia’s Duane Morris filed an amended petition on Aug. 8 that ups potential damages in the case to about $764 million, according to Tony Buzbee, who represents the investor group behind the suit.

“A case like this could bankrupt that firm,” Buzbee said of Duane Morris, which ranks 71st among the Am Law 100 with $454 million in gross revenues last year.