From the New York Times: New details on how one investor's insight popped the housing bubble

Three and half years ago, a New York hedge fund manager with a bearish view on the housing market was pounding the pavement on Wall Street.

Eager to increase his bets against subprime mortgages, the investor, John A. Paulson, canvassed firm after firm, looking for new ways to profit from home loans that he was sure would go sour.

Only a few investment banks agreed to help him. One was Deutsche Bank. The other was the mighty Goldman Sachs.

Mr. Paulson struck gold. His prescience made him billions and transformed him from a relative nobody into something of a celebrity on Wall Street and in Washington.

But now his brassy bets have thrust Mr. Paulson into an uncomfortable spotlight. On Friday, the Securities and Exchange Commission filed a civil fraud lawsuit against Goldman for neglecting to tell its customers that mortgage investments they were buying consisted of pools of dubious loans that Mr. Paulson had selected because they were highly likely to fail.

By betting against the pool of questionable mortgage bonds, Mr. Paulson made $1 billion when they collapsed just a few months later, the S.E.C. said. Investors, who bought what regulators are essentially calling a pig in a poke, lost the same amount.

Mr. Paulson, 54, was not named as a defendant in the S.E.C. suit, but his role in devising the instrument that caused $1 billion in losses for Goldman’s customers is detailed in the complaint. Robert Khuzami, the director of enforcement at the S.E.C., explained that, unlike Goldman, the manager of the hedge fund, Paulson & Company, had not made misrepresentations to investors buying the security, known as a collateralized debt obligation.

“While it’s unfortunate that people lost money investing in mortgage-backed securities, Paulson has never been involved in the origination, distribution or structuring of such securities,” said Stefan Prelog, a spokesman for Mr. Paulson, in a statement. “We have always been forthright in expressing our opinion as to the quality of the underlying mortgages. Paulson has never misrepresented our positions to any counterparties.

“There’s no question we made money in these transactions. However, all our dealings were through arm’s-length transactions with experienced counterparties who had opposing views based on all available information at the time. We were straightforward in our dislike of these securities, but the vast majority of people in the market thought we were dead wrong and openly and aggressively purchased the securities we were selling.”

Still, the details unearthed by the S.E.C. in its investigation show a deep involvement by Mr. Paulson in the creation of the investment, known as Abacus 2007-AC1. For example, he approached Goldman about constructing and marketing the debt security.

After analyzing risky mortgages made on homes in Arizona, California, Florida and Nevada, where the housing markets had overheated, Mr. Paulson went to Goldman to talk about how he could bet against those loans. He focused his analysis on adjustable-rate loans taken out by borrowers with relatively low credit scores and turned up more than 100 loan pools that he considered vulnerable, the S.E.C. said.

Mr. Paulson then asked Goldman to put together a portfolio of these pools, or others like them that he could wager against. He paid $15 million to Goldman for creating and marketing the Abacus deal, the complaint says.

One of a small cohort of money managers who saw the mortgage market in late 2006 as a bubble waiting to burst, Mr. Paulson capitalized on the opacity of mortgage-related securities that Wall Street cobbled together and sold to its clients. These instruments contained thousands of mortgage loans that few investors bothered to analyze.

Instead, the buyers relied on the opinions of credit ratings agencies like Moody’s, Standard & Poor’s and Fitch Ratings. These turned out to be overly rosy, and investors suffered hundreds of billions in losses when the loans underlying these securities went bad.

Mr. Paulson personally made an estimated $3.7 billion in 2007 as a result of his hedge fund’s performance, and another $2 billion in 2008.