Archegos: How Hidden Leverage Blindsided the Banks

In March 2021, a little-known family office called Archegos Capital Management collapsed within days. Its failure caused more than $10 billion in losses for some of the world's largest banks, including about $5.5 billion at Credit Suisse and nearly $3 billion at Nomura.

Archegos, run by Bill Hwang, had built enormous, concentrated positions in a handful of stocks using borrowed money, largely through derivatives that kept its positions hidden from the market and from its own lenders. In 2024, Hwang was convicted of fraud and sentenced to 18 years in prison. This post-mortem explains how hidden leverage built up and what it teaches about risk.

1. How Archegos Built Its Positions

• Total return swaps. Instead of buying shares directly, Archegos entered swaps with banks. The banks bought the shares, while Archegos received the gains and bore the losses.
• High leverage. Banks provided financing that allowed Archegos to control positions several times larger than its own capital.
• Multiple prime brokers. Archegos spread its positions across several banks, so no single bank saw the full picture.
• Concentration. Positions were concentrated in a small number of stocks, including ViacomCBS, Discovery and several Chinese technology companies.
• Limited disclosure. Because swaps did not require the same public disclosure as direct shareholdings, and family offices face lighter regulation than many funds, the scale of its exposure was largely invisible.

2. The Collapse

• In late March 2021, ViacomCBS announced a share offering, and its stock price fell sharply.
• As prices fell, Archegos faced margin calls it could not meet.
• Banks began selling the underlying shares to cover their exposure. Those that sold first and fastest generally limited their losses; others suffered heavily.
• Large blocks of stock were sold in a matter of days, pushing prices down further.

3. Why the Banks Were Blindsided

• Fragmented information. Each bank saw only its own exposure, not Archegos's total leverage.
• Weak risk management at some banks, as later investigations found, particularly at Credit Suisse.
• Competition for business encouraged generous terms for a large client.
• Misleading information. Prosecutors said Archegos misled banks about the size and concentration of its positions.

4. The Aftermath

• Credit Suisse's losses contributed to the problems that led to its emergency takeover by UBS in 2023.
• Regulators strengthened reporting requirements for security-based swaps and large positions.
• Banks reviewed prime brokerage risk management and client disclosure.
• Bill Hwang was convicted in 2024 of fraud and market manipulation charges and sentenced to 18 years in prison.

5. Lessons for Investors and Family Offices

• Hidden leverage is dangerous. Derivatives can create exposure far larger than it appears.
• Concentration magnifies risk. A few large positions can wipe out an entire portfolio.
• Counterparties need the full picture. Lenders and partners should demand transparency about total exposure.
• Governance matters even for private wealth. Family offices benefit from independent risk oversight and clear limits. See single vs. multi-family offices.
• Liquidity can disappear in forced selling, turning paper losses into real ones. See the 2010 Flash Crash.

For other lessons on leverage and positions, see the Volkswagen short squeeze.

Frequently Asked Questions

What was Archegos?

A family office managing the personal fortune of Bill Hwang, which used large amounts of leverage through derivatives.

How much did banks lose?

More than $10 billion combined, including about $5.5 billion at Credit Suisse and nearly $3 billion at Nomura.

Why were Archegos's positions hidden?

It used total return swaps across multiple banks, which did not require the same public disclosure as direct share ownership.

What happened to Bill Hwang?

He was convicted in 2024 of fraud and related charges and sentenced to 18 years in prison.

The Bottom Line

Archegos showed how leverage hidden in derivatives and spread across multiple lenders can build into a catastrophic loss. For investors, lenders and family offices, the lessons are to insist on transparency about total exposure, limit concentration and treat leverage with respect.

Global Capital Network connects family offices and investors across markets through our events and investor network. Get in touch to learn more.

This article is general information, not investment or legal advice. Figures are approximate.