• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Financespoofing

Former JPMorgan trader reveals how his mentor taught him to place and cancel bogus trades to manipulate markets

By
Eddie Spence
Eddie Spence
and
Bloomberg
Bloomberg
Down Arrow Button Icon
By
Eddie Spence
Eddie Spence
and
Bloomberg
Bloomberg
Down Arrow Button Icon
July 20, 2022, 7:09 AM ET
Gregg Smith, former precious-metals trader for JPMorgan Chase, departs from federal court in Chicago on July 8, 2022.
Gregg Smith, former precious-metals trader for JPMorgan Chase, departs from federal court in Chicago on July 8, 2022. Cheney Orr—Bloomberg/Getty Images

Gregg Smith clicked his computer mouse so rapidly to place and cancel bogus gold and silver orders for Bear Stearns Cos. and later JPMorgan Chase & Co. that his colleagues would joke that he needed to put ice on his fingers to cool them down afterward, or that he must be double-jointed.

That’s how his former protege, Christian Trunz, described for jurors how he watched Smith use so-called “spoof” trades — large orders intended to manipulate prices that were quickly canceled. Trunz, 37, said he learned how to spoof from Smith and others after joining Bear Stearns out of college in 2007, shortly before the bank was acquired by JPMorgan.  

To place and cancel the orders fast required a “rapid succession of clicking on a mouse,” and Smith, the desk’s top trader, was particularly good at it, Trunz told a federal jury in Chicago on Tuesday. That clicking was easy for everyone on the desk to hear, according to Trunz, who sat next to Smith for years and said he often pulled his chair alongside his mentor’s computer screen to watch him trade.

Trunz is the third former trader to testify at the fraud and racketeering trial of Smith and two senior employees at JPMorgan’s precious-metals desk: Managing Director Michael Nowak and hedge-fund salesman Jeffrey Ruffo. They’re accused of systematically cheating to help themselves and their top clients for years.

“This was an open strategy on the desk,” said Trunz, who has pleaded guilty to spoofing charges and is cooperating with prosecutors. “It wasn’t hidden.”

Speed was essential to successfully spoof, especially as a growing share of the precious-metals market was being dominated by firms using computer algorithms to buy and sell futures contracts in fractions of a second, according to Trunz.

“We fully believed this was a battle” between the bank and the so-called algos, Trunz said. “This was the first time when machines were interacting with humans on a trading platform. It was man versus machine.” 

The goal of spoofing was to trick the rival computers into buying or selling to benefit JPMorgan’s position, by using a large volume of bogus orders to create the false market impression, he said.

“Those trades were deceptive,” Trunz said of the thousands of spoof orders the desk placed over the years. “They were used to bring out a reaction from those algorithms to get what we needed done.”

Trunz, whose father worked at JPMorgan for decades and was a senior executive, was trading precious metals for the bank in New York, Singapore and London from 2007 to 2019, when he pleaded guilty. He said he idolized Smith, Nowak and Ruffo and sought to learn as much as he could from them so he could emulate their success. 

Trunz said he sat next to Smith for five years until 2013, and when he moved to London in 2014, worked closely with Nowak, who he got to know well. Ruffo was “the best salesman on the street,” with a long list of big clients, and was the primary reason JPMorgan had kept the Bear Stearns team intact after the acquisition, Trunz said.

Smith spoofed almost every day, Nowak did so about once a week, and Ruffo, while not a trader, would sit next to Smith and encourage him to spoof the market to execute client orders at the best possible prices, Trunz said. It wasn’t unusual to hear Ruffo urge Smith to “keep clicking, keep going,” with a spoof trade, Trunz said. 

“We all traded that way,” Trunz said. “We utilized that strategy on the desk to make money for ourselves and for our clients.”

Smith would sometimes spoof markets one way, then the other when filling orders for Ruffo’s top hedge fund clients to make sure they felt like they were getting a good price, Trunz said.

Prosecutors showed jurors internal chat logs between Ruffo and Moore Capital Management’s Christopher Pia from April 3, 2008, in which the hedge fund trader had directed Ruffo to sell 100,000 ounces of silver for him. Smith filled the order, then rapidly placed a large number of additional sell orders that he quickly canceled as the price of silver dropped.

Ruffo then congratulated Pia on his decision to sell. “Did well with that, lower already,” he said in a message. 

Asked to explain why Smith made the spoof trades, Trunz said, “Gregg looks like he was able to execute at a great level. Chris Pia looks like he made a great decision to sell 100,000 ounces when he did.” Trunz added, “Everybody has an ego.”

The case is US v. Smith et al, 19-cr-00669, US District Court, Northern District of Illinois (Chicago)

Sign up for the Fortune Features email list so you don’t miss our biggest features, exclusive interviews, and investigations.

About the Authors
By Eddie Spence
See full bioRight Arrow Button Icon
By Bloomberg
See full bioRight Arrow Button Icon

Latest in Finance

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • World's Most Admired Companies
  • See All Rankings
  • Lists Calendar
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Lists Calendar
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • About Us
  • Lists Calendar
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Finance

Current refi mortgage rates report for April 27, 2026
Personal FinanceReal Estate
Current refi mortgage rates report for April 27, 2026
By Glen Luke FlanaganApril 27, 2026
43 minutes ago
Current ARM mortgage rates report for April 27, 2026
Personal FinanceReal Estate
Current ARM mortgage rates report for April 27, 2026
By Glen Luke FlanaganApril 27, 2026
43 minutes ago
Mortgage rates today, April 27, 2026
Personal Financemortgages
Mortgage rates today, April 27, 2026
By Glen Luke FlanaganApril 27, 2026
43 minutes ago
The ‘obscene economics’ of modern warfare show how the race to military supremacy is transforming, while U.S. rearmament relies on China 
Economyarms, weapons, and defense
The ‘obscene economics’ of modern warfare show how the race to military supremacy is transforming, while U.S. rearmament relies on China 
By Jason MaApril 26, 2026
9 hours ago
Chevron CEO says Venezuela must do more for oil industry revival
EnergyVenezuela
Chevron CEO says Venezuela must do more for oil industry revival
By Maria Paula Mijares Torres and BloombergApril 26, 2026
11 hours ago
Sergey Brin confronted Gavin Newsom at a treehouse party — then launched a political war
PoliticsElections
Sergey Brin confronted Gavin Newsom at a treehouse party — then launched a political war
By Eliyahu Kamisher, Biz Carson and BloombergApril 26, 2026
11 hours ago

Most Popular

'You feel radicalized': A Meta AI exec watched agents beat her top workers. Now she's built a nonprofit to help Gen Z find jobs before they disappear
Future of Work
'You feel radicalized': A Meta AI exec watched agents beat her top workers. Now she's built a nonprofit to help Gen Z find jobs before they disappear
By Jake AngeloApril 26, 2026
24 hours ago
The U.S. military may have already used up half of its most expensive missiles, and it could take up to 4 years to rebuild its stockpiles
Politics
The U.S. military may have already used up half of its most expensive missiles, and it could take up to 4 years to rebuild its stockpiles
By Sasha RogelbergApril 24, 2026
3 days ago
More than 90,000 tech workers have been laid off this year. But here’s why companies like Microsoft are offering voluntary buyouts instead
Big Tech
More than 90,000 tech workers have been laid off this year. But here’s why companies like Microsoft are offering voluntary buyouts instead
By Jacqueline MunisApril 26, 2026
19 hours ago
Tim Cook built Apple into a $4 trillion company. Then his greatest strength became his biggest liability
Commentary
Tim Cook built Apple into a $4 trillion company. Then his greatest strength became his biggest liability
By Andrea PetroneApril 25, 2026
2 days ago
This CEO lived on canned soup and took just two days off for his daughter’s birth. Now he admits he lost sight of proper work-life balance
Success
This CEO lived on canned soup and took just two days off for his daughter’s birth. Now he admits he lost sight of proper work-life balance
By Preston ForeApril 25, 2026
2 days ago
Elon Musk says saving for retirement is irrelevant because AI is going to create a world of abundance: 'It won't matter'
Future of Work
Elon Musk says saving for retirement is irrelevant because AI is going to create a world of abundance: 'It won't matter'
By Marco Quiroz-GutierrezApril 26, 2026
14 hours ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.