Vanna and the Big Put: unusual suspects in a market mystery
US equity reversal on January 24 has spawned many theories, but no solid answers
The stock market sell-off on January 24 materialised and then vanished like a crime without trace.
That morning, the S&P 500 took a bloodying at the hands of investors, plunging nearly 4%. By the afternoon, the sellers had vanished. The index ended the day up a third of a per cent. The Nasdaq saw an even more extreme version of this turnabout, falling close to 5% by midday, then recovering so
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