The former wife of one of the investment managers accused of defrauding the University of Pittsburgh, Carnegie Mellon University and other investors of more than $500 million received nearly $19 million of the misappropriated funds, according to government regulators.

The Commodity Futures Trading Commission said Janet Schaberg received $18.9 million from an account held by WG Trading Investors, a firm controlled by her former husband, Stephen Walsh, and his partner, Paul Greenwood. The federal regulators made the charge in papers filed in federal court in Manhattan on Wednesday.

The amount is about $16 million more than had been previously disclosed by federal investigators.

Last month, prosecutors charged Mr. Walsh and Mr. Greenwood with using funds invested by universities, pension funds and other investors to cover up investment losses and to buy horses and a horse farm, a $3 million home for Ms. Schaberg, rare books and collectible teddy bears.

Similar allegations were made in civil lawsuits filed by the CFTC and the Securities and Exchange Commission.

Yesterday, Mr. Greenwood, 61, of North Salem, N.Y., filed court papers declining to respond to the agencies' lawsuits, citing his Fifth Amendment right against self-incrimination.

The CFTC said $16.3 million of the $18.9 million was transferred from a WG Trading account to Ms. Schaberg between August 2000 and November 2006, when she signed a separation agreement with Mr. Walsh. The federal agency cited the transfers as another reason to maintain a freeze on the assets of Mr. Greenwood, Mr. Walsh and Ms. Schaberg while a court-appointed receiver unravels what happened to investors' money.

Ms. Schaberg "has never had a legal right to a single penny of investor funds," CFTC attorneys said in court papers.

Mr. Greenwood and Mr. Walsh want U.S. District Court Judge George B. Daniels to modify the asset freeze so that they can pay for living and other expenses, including Mr. Greenwood's horse farm.

In court papers, Ms. Schaberg's attorneys told the judge there is no legal basis for freezing her assets, saying Ms. Schaberg is "an admittedly innocent non-party" who legitimately owns the property.

CFTC attorneys said that their review of Mr. Greenwood's and Mr. Walsh's assets indicates "a strong probability" that they do not have enough money "to remotely cover the losses incurred by their misappropriation of investor funds."

Federal investors became interested in Westridge after Pitt and Carnegie Mellon filed a federal lawsuit in Pittsburgh last month seeking the return of more than $114 million. Pitt claims it had invested more than $65 million with Westridge since 2002. Carnegie Mellon, which began investing with Westridge in April, believed it had a balance of more than $49 million with the firm as of Jan. 31.