Triple witching
Quarterly Friday when stock options, index options and index futures all expire together.
Definitions
Third Friday of March, June, September and December. Three derivative classes — stock options, stock-index futures and stock-index options — expire on the same day. Hedges get unwound en masse, volume explodes, and weird closing prints are a feature, not a bug. (Single-stock futures made it 'quadruple witching' for a while, but those got delisted.)
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