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How Jane Street’s secret billion-dollar trade unraveled

Punit Paranjpe
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On Wall Street, fortunes are often won and lost with the tiniest advantages. And for the past few years, one trading firm has stood out from the rest for both huge profits and careful secrecy — Jane Street Group.

But last year, one of Jane Street's biggest and most lucrative trading strategies was unexpectedly revealed in a Manhattan courtroom. The news ricocheted around the world. It drew the attention of competitors and regulatory agencies, destabilized billions of dollars worth of trades, and called into question some of the most fundamental strategies in global finance. 

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This episode was hosted by Alexi Horowitz-Ghazi and Mary Childs. It was produced by Eric Mennel, with production help from Sam Yellowhorse Kesler and Cooper Katz-McKim. It was edited by Jess Jiang. Fact-checking by Sierra Juarez. Planet Money's executive producer is Alex Goldmark.

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Alexi Horowitz-Ghazi is a co-host and reporter for Planet Money.
Mary Childs
Mary Childs (she/her) is a co-host and correspondent for NPR's Planet Money podcast. Before joining the team in 2019, she was a senior reporter at Barron's magazine, where she covered the alternatives industry, the bond market and capitalism. Before that, she worked at the Financial Times and Bloomberg News. She's written about the pioneering of new asset classes like time, billionaire's proposals to solve inequality and diversity and discrimination in the finance industry. Before all that, she was also a Watson Fellow, spending a year traveling the world painting portraits. She graduated from Washington & Lee University in Lexington, Virginia, with a degree in business journalism and an honors thesis comparing the use and significance of media sting operations in the U.S. and India.
Jess Jiang is the producer for NPR's international podcast, Rough Translation. Previously, Jess was a producer for Planet Money. In 2014, she won an Emmy for the team's T-shirt project. She followed the start of the t-shirt's journey, from cotton farms in Mississippi to factories in Indonesia. But her biggest prize has been getting to drive a forklift, back hoe, and a 35-ton digger for a story. Jess got her start in public radio at Studio 360—though, if you search hard enough, you can uncover a podcast she made back in college.
Eric Mennel
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