triple witching en · NOUN
Etymology
The idea of witching for these days is from the unusual patterns of trading that can occur ahead of the contract expiries.
Meanings
- (uncountable) Simultaneous expiry on US markets of stock index futures, stock index options, and stock options, which took place on the third Friday of March, June, September, and December. (With the introduction of single stock futures those days are now quadruple witching.)