Almost 16 years after Harry Markopolos initially warned the SEC in vain that Bernie Madoff was operating a massive Ponzi scheme, Markopolos says he has found three more schemes that are multi-billion dollar pyramids of fraud.

One of them, he told ABC News, is even bigger than Madoff’s epic scam, estimated at fraud in the neighborhood of $65 billion.

For now, Markopolos is declining to name names, because he wants the regulatory and enforcement agencies to get the information first. MORE