New potential victims emerged of Wall Street veteran Bernard Madoff's alleged giant Ponzi scheme, with international banks, hedge funds and wealthy private investors among those sorting out what could amount to tens of billions of dollars in losses.

New York Mets owner Fred Wilpon, GMAC LLC Chairman J. Ezra Merkin and former Philadelphia Eagles owner Norman Braman were among the dozens of seemingly sophisticated investors who placed money on what could prove to be history's largest financial scam.

Giant French bank BNP Paribas, Tokyo-based Nomura Holdings Inc. and Neue Privat Bank in Zurich are also exposed, according to people familiar with the matter.

And at least three funds of hedge funds -- which raise money from investors and farm it out to hedge funds -- may have significant losses. Fairfield Greenwich Group and Tremont Capital Management of New York placed hundreds of millions of their investors' dollars into funds overseen by Mr. Madoff. On Friday, Maxam Capital Management LLC reported a combined loss of $280 million on funds they had invested with Mr. Madoff.

"I'm wiped out," said Sandra Manzke, Maxam's founder and chairman. The Darien, Conn., fund of hedge funds will have to close as a result of the losses, she said.