Brian Nichols is the co-founder of Angel Squad, a community where you’ll learn how to angel invest and get a chance to invest as little as $1k into Hustle Fund's top performing early-stage startups

Carl Icahn started his career in arbitrage trading in 1961 at a Wall Street firm. He founded Icahn & Co in 1968, initially focused on options trading and arbitrage. By the late 1970s, he had discovered something more interesting: buying large stakes in underperforming companies, demanding strategic or management changes, and realizing the gap between stock price and intrinsic value.

He did not invent activist investing. He industrialized it.

The Icahn Playbook

Carl Icahn investments follow a specific, repeatable logic. He identifies companies he believes are undervalued due to management inefficiency, misallocated capital, or strategic drift. He buys a significant stake, large enough to demand board representation or force management response. He then advocates publicly and loudly for change: sell the company, return capital to shareholders, change leadership, restructure operations.

He has applied this to TWA, which he took over in 1985 and effectively dismantled while generating personal profits. He pushed Apple to accelerate buybacks in 2013, generating massive shareholder returns. He went after Herbalife in a public battle with Bill Ackman that became one of the most-watched hedge fund confrontations in a decade. He forced changes at companies including eBay, PayPal, and Dell.

His investment vehicles include Icahn Capital Management LP, which he uses for public equity activism. The publicly traded Icahn Enterprises LP (IEP) is his primary holding vehicle, representing approximately 50% of his reported portfolio. IEP operates across energy through CVR Energy, utilities through Southwest Gas, chemicals, automotive, food packaging, real estate, and pharmaceuticals.

The Hindenburg Attack and Its Aftermath

In 2023, short seller Hindenburg Research published a report alleging that Icahn Enterprises was overstating asset values and sustaining its high dividend through an unsustainable financial structure that Hindenburg described as "ponzi-like." IEP shares fell nearly 37% intraday. Icahn's personal net worth declined by more than $10 billion in a single session. The company subsequently cut its quarterly dividend from $2 to $1, triggering another 25% decline.

Icahn conceded in subsequent interviews that he had maintained too large a leveraged short position betting against markets, a bet that had cost the fund significantly. He later acknowledged the broader lesson: even experienced investors can violate their own principles when conviction becomes overconfidence.

The Securities and Exchange Commission subsequently investigated IEP over disclosure of up to $5 billion in margin loans backed by Icahn's IEP stake. Icahn settled the charges without admitting or denying wrongdoing, paying $2 million in civil penalties.

Shiyan Koh of Hustle Fund has noted that the most important thing any investor can learn from watching experienced investors fail is what they ignored from their own stated philosophy. Icahn's stated philosophy has always been to buy beaten-down assets, not to make directional macroeconomic bets. When he departed from that, the losses came. Angel Squad members who develop clear investment theses and then violate them have a name for that: expensive lessons. The community at Hustle Fund helps early-stage investors develop and maintain their frameworks. Join at hustlefund.vc/squad.

The Portfolio Today

As of late 2025, Icahn's disclosed portfolio is concentrated heavily in his own conglomerate. IEP represents approximately 50% of reported holdings. CVR Energy, his refining and chemicals play, represents around 17%. Southwest Gas accounts for around 9%. The remainder is spread across CVR Partners, International Flavors & Fragrances, Bausch Health, and a handful of other positions.

His portfolio has shrunk from peak values but remains significant at $9 billion in reported holdings. His net worth, once estimated at $24 billion, has been revised significantly downward to around $7 to $8 billion by major financial publications following the 2023 Hindenburg event and subsequent market movements.

The Legacy

Icahn is 88 years old and still actively managing his portfolio. He is one of the few people to have practiced activist investing at scale across five decades, through multiple market cycles and regulatory environments. His influence on corporate governance, shareholder rights, and the expectation that management is accountable to capital is real. Many of the proxy fights, board representation demands, and shareholder letter campaigns that are now commonplace in public markets trace their modern form to Icahn's career.

Elizabeth Yin of Hustle Fund has written that the most lasting contribution any investor makes is not their returns but the framework they prove works. Icahn proved that concentrated ownership plus operational pressure can unlock value in public companies. That framework is now standard across activist investing globally. 

Angel Squad members who study the full arc of activist investing, from Icahn's earliest hostile takeovers to the modern proxy fight playbook, develop a much sharper lens for evaluating how management quality and capital allocation affect early-stage returns as well as public company returns. The community explores these frameworks at hustlefund.vc/squad.