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Dow −22.61% in one session
Black Monday
The Dow Jones Industrial Average fell 508.32 points — a 22.61% single-day decline that remains the largest one-day percentage drop in the index's history. The S&P 500 fell 20.4% the same day. It happened in hours, not months, with no comparable modern precedent at the time.
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S&P 500 −57% peak-to-trough
The Global Financial Crisis
The S&P 500 peaked near 1,565 on October 9, 2007, then fell to roughly 676 by March 9, 2009 — a 57% peak-to-trough decline over about seventeen months. It was slower than 1987 or 2020, but far deeper, and it unfolded alongside a real banking and credit crisis, not just an equity sell-off.
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S&P 500 −34% in ~5 weeks
The COVID-19 Crash
The S&P 500 fell from about 3,386 on February 19, 2020 to about 2,237 by March 23 — roughly 34% in a little over a month, the fastest 30% drawdown on record at around 22 trading days, versus roughly seventeen months for 2008. The CBOE Volatility Index (VIX) spiked to a closing high of 82.69 on March 16, 2020 — its highest level since the 2008 crisis.
The intellectual history
The modern vocabulary for this kind of risk traces largely to one collaboration. Nassim Nicholas Taleb and Mark Spitznagel ran the hedge fund Empirica Capital together from 1999 to 2004, built explicitly around protecting against rare, extreme events. In 2007 — the same year Taleb published The Black Swan — Spitznagel founded Universa Investments, a firm built specifically around tail-risk hedging, with Taleb serving as its scientific adviser. The timing wasn't an accident: Universa launched just before the crisis its thesis was built to survive.
None of this is an endorsement of any particular fund or manager — it's simply the most well-documented origin of the terminology and the strategy family this site describes.