How One Excel Error Cost a Bank $6 Billion

A single spreadsheet formula error. That is all it took for the largest bank in America to erase $6.2 billion overnight.

When JPMorgan Chase announced a staggering multi-billion dollar trading loss in 2012, the media blamed a rogue trader nicknamed "The London Whale." But the real culprit wasn't a criminal mastermind—it was a simple, manual error tucked inside a Microsoft Excel file.

In this episode of Error Margin, we tear apart the boardroom records to look at the exact mathematical blunder that slipped past risk analysts, masked severe market volatility, and proved that a tiny error margin can completely collapse a multi-billion dollar financial empire.

Welcome to Error Margin. We map out the hidden structural flaws, tech glitches, and corporate failures that changed history.

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