A law firm is asking a federal judge to approve nearly $700 million in attorney fees for its efforts to help Enron Corp. shareholders and investors recoup billions they lost after the once-mighty energy company collapsed.

San Diego, Calif.-based Coughlin Stoia Geller Rudman & Robbins said that it has helped plaintiffs recover almost $7.3 billion so far, mostly from financial institutions that investors claim played roles in the accounting fraud that led to Enron’s 2001 unraveling. If approved, the attorney fees would be the largest in a securities fraud case.