The rogue trader is a control failure first

Graduate · enrolled learners

This lesson opens with Societe Generale and Jerome Kerviel, 2008.

What happened

Jerome Kerviel, a trader at the French bank Societe Generale, built enormous unauthorized directional positions, tens of billions of euros in notional, far beyond anything he was permitted to hold, and he hid them by entering fictitious offsetting trades into the bank's systems that made his book appear balanced and within its limits. The bank's General Inspection found the fraud began in 2005 and grew from March 2007: short index-futures positions of 28 billion euros by June 2007 and 30 billion by October, then a long position of 49 billion euros built between January 2 and 18, 2008. Because the fake trades made the real risk invisible, the position grew unnoticed until it was discovered on January 20, 2008, and when the bank unwound it into a falling market between January 21 and 23 it lost 6.4 billion euros, which after the 1.5 billion euros of hidden 2007 profit left a net loss of about 4.9 billion euros, roughly 7.2 billion dollars, one of the largest trading losses in history. Kerviel had come up from a support job in the office that monitors trades and knew its controls from the inside, so he knew which trades were never independently confirmed, which alerts were not chased, and how to make a book look hedged when it was not. Nothing about the loss required a genius; it required a set of controls that could be evaded, and they were. The individual was dishonest, but the money was lost because the controls that should have surfaced the position did not.

The decision point

A large rogue-trading loss is, first and most importantly, a failure of controls, and only second a story about one dishonest individual, because the individual can only build a catastrophic hidden position if the controls that should have surfaced it do not, so the enduring lesson is always about the gaps that let the position grow rather than the character of the person who exploited them. Societe Generale and Kerviel are the case: a trader built tens of billions in unauthorized positions and hid them behind fictitious offsetting trades, and the bank lost about 7.2 billion dollars, not because one man was uniquely brilliant but because he knew, from his earlier job monitoring trades, exactly which controls could be evaded, and they were. This reframing matters because the instinct after a rogue-trading loss is to focus on the rogue, to treat the loss as the act of a bad actor and the fix as catching bad actors, when the actual cause is structural: trades that were never confirmed with counterparties, limits that could be gamed with fake hedges, alerts that fired and were not pursued. Every one of those is a control that failed, and every one would have caught the position regardless of the trader's intent or cleverness. So the discipline for anyone running or relying on a trading operation is to read a rogue-trading loss as a diagnosis of the controls, to ask what specific check would have surfaced the position and why it did not, and to fix the gap rather than merely punish the person, because the next dishonest trader will find the same gap, and the money is lost through the gap, not the person. Societe Generale is the reminder that behind every rogue trader is a control that let them, and it is the control, not the rogue, that a serious operation must fix.

Recorded loss

$7,200,000,000

Orientation and Year One are open: anyone can read them without an account. From Year Two onward the lessons are for enrolled learners, because progress through the later years only means anything if it is tracked against a record.

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