Failure modes · Sizing
Archegos: Concentration, Total-Return Swaps, and No Stop at Scale
Bill Hwang’s family office built equity exposure through swaps that kept the aggregate position invisible to any single bank. When the names fell, there was no pre-committed limit that forced a reduction before the capital was gone.
In a single week in March 2021, roughly $20 billion of Archegos capital was wiped out. Banks that had extended total-return swaps lost more than $10 billion collectively. Credit Suisse alone took a $5.5 billion hit. The positions were concentrated equity bets, largely hidden from public view and from any single counterparty’s full picture because each bank saw only its own bilateral exposure.
Hwang had a prior SEC settlement. The pattern that mattered for risk was simpler: position size was not constrained by any pre-committed aggregate limit that would have forced selling while equity remained. Continuous addition in rising markets became catastrophic addition in falling ones. FOMO at institutional scale still ends in the same place as FOMO at retail scale when there is no stop.
What the structure concealed
Total-return swaps let the economic exposure grow without the disclosure that would have applied to cash equities of the same size. Each prime broker managed its own risk. None saw the sum. When the underlying names declined, the simultaneous unwind across banks accelerated the fall. The absence of a portfolio-level circuit breaker meant the first large down day was already too late.
This is not a story about derivatives being inherently evil. It is a story about leverage and concentration without an external or pre-written constraint. The same error appears in smaller accounts that keep adding to a winner until the position is large enough to dominate the portfolio, then discover they cannot exit without moving the price or violating their own risk tolerance.
What to do with this
Set a maximum percentage of portfolio equity that any single name, sector or factor can represent, measured on a look-through basis if you use derivatives or structured products. Write the number down. When a position approaches it, the rule is reduction, not a fresh justification for why this time is different. The Archegos outcome is what happens when that rule does not exist.