Witching hour
The last hour of trading on options-expiry days, when prices go feral.
Definitions
The final hour before the close on derivative-expiry days. Traders are unwinding hedges, rolling positions, and chasing strikes all at once. Volume spikes, spreads widen, and the tape does things it doesn't do on a Tuesday.
Outside finance, the folkloric hour around midnight when supernatural stuff is meant to peak.
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