Chad Urdy

“When the Axcom team started testing the approach, they quickly began to see improved results. The firm began incorporating higher dimensional kernel regression approaches, which seemed to work best for trending models, or those predicting how long certain investments would keep moving in a trend.”
― Gregory Zuckerman, The Man Who Solved the Market: How Jim Simons Launched the Quant Revolution

“Elsewhere, statisticians were using similar approaches—called kernel methods—to analyze patterns in data sets. Back on Long Island, Henry Laufer was working on similar machine-learning tactics in his own research and was set to share it with Simons and others. Carmona wasn’t aware of this work. He was simply proposing using sophisticated algorithms to give Ax and Straus the framework to identify patterns in current prices that seemed similar to those in the past.”
― Gregory Zuckerman, The Man Who Solved the Market: How Jim Simons Launched the Quant Revolution

“The strategies were often based on the idea that prices tend to revert after an initial move higher or lower. Laufer would buy futures contracts if they opened at unusually low prices compared with their previous closing price, and sell if prices began the day much higher than their previous close. Simons made his own improvements to the evolving system, while insisting that the team work together and share credit.”
― Gregory Zuckerman, The Man Who Solved the Market: How Jim Simons Launched the Quant Revolution

“The options also were a way of shifting enormous risk from Renaissance to the banks. Because the lenders technically owned the underlying securities in the basket-options transactions, the most Medallion could lose in the event of a sudden collapse was the premium it had paid for the options and the collateral held by the banks. That amounted to several hundred million dollars. By contrast, the banks faced billions of dollars of potential losses if Medallion were to experience deep troubles. In the words of a banker involved in the lending arrangement, the options allowed Medallion to “ring-fence” its stock portfolios, protecting other parts of the firm, including Laufer’s still-thriving futures trading, and ensuring Renaissance’s survival in the event something unforeseen took place. One staffer was so shocked by the terms of the financing that he shifted most of his life savings into Medallion, realizing the most he could lose was about 20 percent of his money.”
― Gregory Zuckerman, The Man Who Solved the Market: How Jim Simons Launched the Quant Revolution