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

This Stock Lost $1.4 Billion on Trump’s Inauguration Day

Lucinda Shen
By
Lucinda Shen
Lucinda Shen
Down Arrow Button Icon
Lucinda Shen
By
Lucinda Shen
Lucinda Shen
Down Arrow Button Icon
January 20, 2017, 4:38 PM ET
President Donald Trump.
Photograph by J. Scott Applewhite—Pool/Getty Images

Andrew Left of Citron Research, the short seller that helped bring Valeant Pharmaceuticals down to its knees, has chosen to make a very specific Trump trade public on the day of the president’s inauguration: Bet against airplane parts manufacturer TransDigm Group.

After Left published a paper Friday predicting that President Donald Trump will crack down on the prices of aerospace industry goods, shares of $13 billion TransDigm plunged as much as 13%. That made the stock the worst performing on the S&P 500 around noon that day. It also caused the company to shed $1.4 billion in market cap by the market’s close.

“President Trump has become to aerospace what Hillary was to pharmaceuticals,” Left wrote. “He has already made lowering prices for military aircraft a pillar of his transition into office.”

Left pointed to two of Trump’s tweets as a sign that the president won’t be soft on aerospace and defense. On Dec. 6, Trump wrote that the cost of a Boeing Air Force One is “out of control.” Roughly a week later, he called out the cost of Lockheed and Martin’s F-35, writing that “billions of dollars can and will be saved on military (and other) purchases after January 20.”

 

The short seller argues that Trump should target TransDigm in the future because the company appears to have arbitrarily hiked the price of its goods.

TransDigm is also highly susceptible to Trump’s influence because the Department of Defense is TransDigm’s single largest customer.

Later on Friday, Credit Suisse analyst Robert Spingarn defended the company. While he conceded that TransDigm’s goods are expensive, he added that the company has a higher growth rate and profitability than its peers. Additionally, if Trump tried to lower the prices, investors would see the warning signs.

“If the government were to pursue lower prices from TransDigm, we would expect this to be a lengthy process,” Spingarn wrote. “One thing we can’t account for is ‘tweet risk,’ but we think the likelihood of this making it to Trump’s tweet desk is low, and the likelihood of singling out a single aerospace parts supplier is even lower.”

On the same day, the S&P 500 rose 0.34%.

About the Author
Lucinda Shen
By Lucinda Shen
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
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
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
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
Fortune Secondary Logo
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Finance

EnergyOil
The Strait of Hormuz is a critical choke point for global energy markets, but there are ways to get around it
By Jason MaMarch 2, 2026
6 hours ago
trump
Economynational debt
Interest on the $38.8 trillion national debt has tripled since 2020, and it already costs taxpayers more than defense and Medicaid
By Nick LichtenbergMarch 2, 2026
6 hours ago
trump
Middle EastMiddle East
Trump’s strikes on Iran could cost American economy as much as $210 billion, top budget expert says
By Nick LichtenbergMarch 2, 2026
7 hours ago
OpenAI logo is seen in this photo illustration with the South Korean flag in the background
AIOpenAI
‘Could it kill someone?’ A Seoul woman allegedly used ChatGPT to help carry out two murders in South Korean motels
By Catherina GioinoMarch 2, 2026
7 hours ago
Commercial vessels in the Persian Gulf
EnergyIran
Energy markets offer ‘relatively small reaction’ to Iran war, but prices could spike if oil and gas aren’t flowing by the end of the week
By Jordan BlumMarch 2, 2026
7 hours ago
A woman stands with her hand on her hip as she pumps gas into her car.
EnergyOil
Oil markets are bracing for $100 barrels and a redux of a 1970s-era crisis but ‘three times the scale,’ analyst warns
By Sasha RogelbergMarch 2, 2026
7 hours ago

Most Popular

placeholder alt text
Middle East
U.S. military gives Iran a taste of its own medicine with cheap copycat Shahed drones, while concern shifts to munitions supply in extended conflict
By Jason MaMarch 1, 2026
1 day ago
placeholder alt text
Success
MacKenzie Scott's close relationship with Toni Morrison long before Amazon put Scott on the path to give more than $1 billion to HBCUs
By Sasha RogelbergMarch 1, 2026
1 day ago
placeholder alt text
Economy
Your grandparents are the reason the U.S. isn't in a recession right now. That won't last forever
By Eleanor PringleMarch 1, 2026
2 days ago
placeholder alt text
AI
American schools weren’t broken until Silicon Valley used a lie to convince them they were—now reading and math scores are plummeting
By Sasha RogelbergMarch 1, 2026
1 day ago
placeholder alt text
Success
Slack cofounder says workers and CEOs can get stuck doing 'fake' work like pre-meetings and slideshows
By Emma BurleighMarch 1, 2026
2 days ago
placeholder alt text
Health
Gen Z men are eating ‘boy kibble,’ the human equivalent to dog food, to load up on protein cheaply
By Jake AngeloMarch 1, 2026
2 days 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.