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What Happened

In March 2021, Archegos Capital Management, a family office run by Bill Hwang, collapsed after suffering massive losses on leveraged equity positions. The event led to over $10 billion in losses across multiple major banks.

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Market Context

Archegos built large positions in a small group of equities, including:
  • ViacomCBS
  • Discovery
  • Baidu
  • Tencent Music
These positions were established using total return swaps, allowing Archegos to gain exposure without directly owning the shares.

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The Core Mechanism

The strategy relied on:
  • concentrated bets on a few stocks
  • significant leverage through derivatives
  • continued price stability or upward movement
Because of the structure, actual exposure was much larger than visible capital.

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What Changed

Several of the core positions began to decline:
  • negative price movement triggered losses
  • margin requirements increased
  • counterparties demanded additional collateral
As positions moved against Archegos, pressure intensified rapidly.

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Why It Failed

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1. Extreme Concentration

The portfolio was heavily concentrated in a small number of equities. → losses were not diversified

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2. Correlated Exposure

Many positions were driven by similar market dynamics. → multiple assets declined simultaneously

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3. High Leverage

Use of swaps allowed Archegos to take positions far larger than its capital base. → small price changes had amplified effects

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4. Lack of Transparency

Positions were spread across multiple prime brokers. → no single counterparty had full visibility of total exposure

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Outcome

As prices declined:
  • margin calls increased
  • positions were liquidated
  • forced selling accelerated the decline
This created a feedback loop: → falling prices → forced selling → further price declines The portfolio collapsed within days.

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Key Insight

Leverage and concentration can transform moderate market moves into systemic failures.

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Structural Lesson

The failure was not caused by a single trade. It resulted from:
  • excessive leverage
  • concentrated positions
  • correlated exposure
  • lack of risk visibility

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Connection to Risk Management

This case illustrates that:
  • apparent diversification can be misleading
  • leverage amplifies both gains and losses
  • correlation increases under stress
  • hidden exposure can accumulate across positions

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Final Insight

The relevant question is not:
“How large is each position?”
But:
“How large is total exposure under stress?”
→ Accounting for Correlated Risk in Trading
→ Blowing an Account with 5% Risk
→ Kelly vs Fixed Risk