Carl Icahn is one of the most influential activist investors in American history, credited with helping turn shareholder activism into a mainstream strategy. After founding Icahn & Co. in 1968, he built a reputation in the 1980s as a 'corporate raider' through hostile takeovers, most notoriously his 1985 acquisition of TWA, and went on to wage high-profile campaigns at companies including RJR Nabisco, Texaco, Apple, Dell, eBay, and Herbalife.
His power is channeled through Icahn Enterprises LP (IEP), a publicly traded diversified holding company he controls, which houses both his activist investment funds and operating businesses spanning energy, automotive, food packaging, real estate, and pharmaceuticals. IEP owns a controlling stake in the oil refiner CVR Energy, giving Icahn a direct interest in fuel and energy policy alongside his equity-market activism.
Icahn's fortune has swung sharply. Once estimated above $24 billion, his net worth fell to roughly $5 billion by early 2026 as IEP units dropped from a peak above $100 to around $8, a slide that accelerated after a 2023 short-seller report and a 2024 SEC settlement. Now in his late 80s, he has continued to add to positions and to designate his son Brett as his eventual successor.
What they control
- Icahn Enterprises LP (IEP), as founder, chairman, and controlling shareholder
- Icahn Capital, the activist investment funds that take large stakes in public companies
- A controlling majority stake in the oil refiner CVR Energy
- Operating subsidiaries across energy, automotive parts, food packaging, real estate, and pharma
- A standing ability to pressure corporate boards into buybacks, spin-offs, and management changes
Key institutions & holdings
Publicly traded holding company (IEP) based in Sunny Isles Beach, Florida.
The activist investment arm that runs Icahn's equity campaigns.
Oil refining and nitrogen-fertilizer company.
Key facts
- Born February 16, 1936; founded Icahn & Co. in 1968 and pioneered modern shareholder activism.
- Took control of TWA in a 1985 hostile takeover that became a defining 'corporate raider' episode.
- Controls Icahn Enterprises LP, whose units fell from a peak above $100 to roughly $8 by early 2026.
- His net worth, once estimated above $24 billion, was around $5 billion by early 2026.
- In August 2024 the SEC settled charges that Icahn and IEP failed to disclose that he had pledged IEP units as collateral for personal margin loans; Icahn paid $500,000 and IEP $1.5 million, with no admission of wrongdoing.
- Controls a majority stake in oil refiner CVR Energy through Icahn Enterprises.
Timeline
- 1968Founds Icahn & Co., launching his investing career.
- 1985Takes control of TWA in a hostile takeover that cements his 'corporate raider' reputation.
- 2013Wages a high-profile activist battle over Herbalife opposite Bill Ackman.
- 2017Serves briefly as a special adviser on regulatory reform to President Trump, then resigns amid conflict-of-interest criticism.
- 2023-05A Hindenburg Research short-seller report alleging a 'ponzi-like' structure sends IEP units tumbling.
- 2024-08Icahn and IEP settle with the SEC over undisclosed pledges of IEP units as loan collateral.
Controversies
SEC settlement over undisclosed margin-loan collateral · 2024
In August 2024 Icahn paid $500,000 and Icahn Enterprises paid $1.5 million to settle SEC charges that they failed to disclose, in IEP filings, that Icahn had pledged a majority of his units as collateral for personal loans. Neither admitted wrongdoing, and the SEC found no fraud or inflation of net asset value.
Hindenburg short-seller report · 2023
A May 2023 report by Hindenburg Research accused IEP of overvaluation and a 'ponzi-like' dividend structure, triggering a sharp drop in IEP units and an SEC inquiry; a related class action was later dismissed and Hindenburg disbanded in 2025.
Corporate-raider legacy · 1985-1990
Icahn's 1980s takeovers, especially the debt-laden breakup of TWA, made him a symbol of an era in which financiers extracted value from companies at the expense of workers and long-term operations.
Network
- Brett IcahnSon and designated successorRuns Icahn investment funds under a succession agreement at Icahn Enterprises.
- Bill AckmanActivist rivalFamously clashed with Icahn over opposing Herbalife positions.
- Donald TrumpFormer associateIcahn briefly advised Trump on regulatory reform in 2017 before resigning.
- Hindenburg ResearchAdversaryShort seller whose 2023 report targeted IEP; the firm disbanded in 2025.
Why this matters
Activist investors like Icahn can compel publicly traded companies that employ thousands of people to restructure, cut costs, spin off divisions, or take on debt to lift the share price. Icahn pioneered using concentrated capital to override management and capture value, a model that reshaped corporate America and still influences how companies weigh workers, long-term investment, and shareholder payouts. His control of an oil refiner also ties his personal fortune to energy and fuel policy.