The Big Short: Who Is the Smartest Guy
If you have seen The Big Short, this post will land differently. If not, watching it or at least reading the plot is worth the twenty minutes.
A quick recap: The Big Short follows three hedge funds — Scion Capital, FrontPoint Partners, and Brownfield Fund — as they short mortgage bonds ahead of the Global Financial Crisis. Each uses credit default swaps (CDS), typically provided by investment banks such as Deutsche Bank and Goldman Sachs.
The movie portrays these investors as unlikely heroes — among the very few who correctly identified the housing boom of 2002–2007 for what it was: an investment mania. And yes, they profited significantly from the collapse.
Or so the story goes.
Allow me to disagree.
I am speaking from experience — I was a hedge fund portfolio manager with a sizeable short position at the time. I expected the housing boom to end badly, but there is a reason I did not use CDS. Watching The Big Short again recently made it clearer to me who the smartest person in the room actually was — and no, it is not who you might expect.
The Hidden Weakness in the CDS Trade
The core issue with CDS is subtle but important.
In theory, CDS acts as insurance on the underlying bonds. However, that protection depends on a formal credit event. If the majority of bondholders voluntarily agree to change the bonds’ terms, a CDS may not trigger — even if bond prices fall significantly.
A relevant example is Greece in 2012. Under pressure from the European Central Bank, most holders of Greek government bonds accepted a restructuring with roughly a 50% haircut. Yet CDS did not compensate investors as many expected — a real-world test of this very weakness. For more on how that episode unfolded, the ISDA documentation on the Greek restructuring remains the most precise account.
To illustrate: imagine buying bonds at 100 with a 5% coupon, while paying 5% annually for CDS protection.
After a voluntary restructuring, the bonds might trade at 50, but CDS may not fully offset that loss. What appears to be a perfect hedge can produce a significant loss.
Back to 2008
At the time, housing was deeply embedded in the American economic and political system. It was not unthinkable that authorities could attempt to stabilize the system in ways that might have complicated CDS payouts.
Was that the most likely outcome? Probably not. But it was a real risk — and one that was largely ignored.
The Smartest Guy in The Big Short
With that in mind, who had the most robust position?
In my view, it was Jared Vennett, Deutsche Bank’s mortgage bond salesman, as depicted in the film. His setup is structurally elegant.
Consider a simplified version:
- Short $1.4 billion of mortgage bonds, paying ~5% borrow cost (~$70 million annually)
- Short $1 billion notional of CDS, receiving ~7% (~$70 million annually)
The result is roughly cash-flow neutral.
From there, the payoff becomes asymmetric:
- If the market collapses: bonds go to zero → large gains; CDS losses offset part of it → net profit of around $400 million
- If authorities intervene: bonds fall (e.g., to 50), CDS may not fully trigger → still substantial profit of around $700 million
- If nothing happens: limited profit, but limited loss
This is what finance calls a highly efficient portfolio — one that balances outcomes rather than simply betting on direction. If you want to understand the mechanics of short selling more broadly, Investopedia’s primer on short positions is a useful starting point.
What The Big Short Missed
Others in the movie were right — and they made money. But they took more risk than they likely realized.
The real edge was not just seeing the problem. It was structuring the position so that multiple outcomes led to profit — including the ones nobody wanted to think about.
That is a different skill entirely. And a rarer one.