What Is Counterparty Risk, and How Did the Fall of Lehman Brothers Almost Collapse the Entire System?
Author: Yan Chan, capital manager at Axone Capital
· 7 min read
When a bank or broker goes bankrupt, your investments can be frozen — even if you did nothing wrong. Counterparty risk is one of the most important concepts in finance, and 95% of beginners have never heard of it.
The Analysis: The Risk You Never See… Until It Hits
When you buy a stock, you naturally think of two types of risk: the risk that the company performs badly (market risk) and the risk that the economy slows down (macro risk). But there is a third risk, far less known, that can ruin you without any analytical mistake on your part: counterparty risk.
Counterparty risk is the risk that the party with whom you have entered into a financial contract cannot honour its obligations. In plain terms: your broker, your bank, or your contract partner goes bankrupt — and you don't get paid.
This risk is everywhere in modern finance. It applies to derivatives (options, swaps, futures), to bonds (the issuer can default), to bank deposits (a bank can become insolvent), and even to online brokers (your account can be frozen if the platform goes bankrupt).
What makes this risk particularly dangerous is its systemic dimension. In global finance, all actors are interconnected: the failure of one major player can trigger a chain reaction, because that player was itself the counterparty of dozens of others. That is exactly what happened in 2008.
The Historical Fact: The Night the World Almost Stopped
On September 14, 2008, Lehman Brothers executives knew their bank was bankrupt. They had 24 hours to find a buyer. The Federal Reserve and the US Treasury had decided — unlike the precedents set by Bear Stearns and Fannie Mae — not to intervene.
On the morning of September 15, 2008, Lehman Brothers filed for bankruptcy with $613 billion in debt. It was the largest bankruptcy in US history. In a single night, thousands of financial contracts around the world suddenly had no solvent counterparty.
The Anecdote: The Day "Risk-Free" Investments Almost Lost Their Value
Among the many victims of the Lehman bankruptcy, there is one that very few people know about: money market funds. These funds are supposed to be the equivalent of an ultra-safe bank account — managers invest in very short-term, very high-quality bonds. The objective is simple: maintain a net asset value of $1 per share, always.
On September 16, 2008, the Reserve Primary Fund — one of the oldest and most respected American money market funds — announced that its net asset value had fallen below $1 per share. The reason? It held $785 million of Lehman Brothers short-term debt, which had suddenly become worthless.
This moment entered history as *"breaking the buck"*. The panic was immediate: within 48 hours, investors withdrew more than $300 billion from US money market funds. The US government had to guarantee the entire sector to prevent a complete collapse of the money market.
This is the perfect illustration of counterparty risk: you thought you had placed your money in something "risk-free", but your fund was itself the counterparty of someone who went bankrupt.
The Concept: How to Manage This Risk in Practice
Counterparty risk cannot be eliminated, but it can be managed and reduced with a few simple principles:
1. Diversify your counterparties — Never put all your money with a single broker or bank. If your broker goes bankrupt, recovery times can be long, even if your assets are technically protected.
2. Understand legal protections — In Europe, bank deposits are guaranteed up to €100,000 by deposit guarantee schemes. Securities accounts at a regulated broker (AMF in France) benefit from client asset protection, generally up to €70,000.
3. Be wary of opaque counterparties — OTC derivatives (*over-the-counter*, traded bilaterally off-exchange) concentrate the greatest counterparty risk. If you don't know exactly who your counterparty is, ask before signing.
4. Monitor the solidity of your intermediaries — Check the credit rating of your bank or broker. An online broker offering extraordinary returns may be taking extraordinary counterparty risks behind the scenes.
The Axone rule: before checking whether an investment returns 8% per year, ask yourself: "what happens if my counterparty goes bankrupt?"
The Axone Capital Macro · Technical · Mindset method integrates this structural vigilance: understand the system in which you invest, not just the numbers on a chart. Counterparty risk is one of the fundamental building blocks of that system — a building block that the 2008 crisis made impossible to ignore for anyone who manages a portfolio seriously.