The last trading hour on the third Friday of the quarters (Mar/Jun/Sep/Dec) when options and futures on stock indexes expire concurrently.
The four times a year that the S&P futures contract expires at the same time as the S&P 100 index option contract and option contracts on individual stocks.
The final hour of the stock market trading session on the third Friday of March, June, September, and December, when option contracts and futures contracts expire on market indexes used by program traders. The simultaneous expirations often set off heavy trading of options, futures and the underlying stocks. see also double witching hour.
The hour before the market closing when options and futures on stock indices expire on the same day, thereby setting off frenzied trading in futures, options, and underlying securities. Traders and arbitrageurs unwind investment positions and produce large price movements in securities. The triple witching hour occurs on the third Fridays of March, June, September, and December.--See also Expiration Effect.
Last hour of trading on the third Friday of March, June, September and December when stock options, futures on stock indexes, and options on these futures expire.
The last trading hour on the third Friday of March, June, September and December when options and futures on stock indexes expire concurrently. (see Options and Futures)
The last hour of stock market trading on days when options and futures contracts expire on market indexes employed by program traders to hedge their positions in stocks.
The last trading hour on the third Friday on which stock options, stock index options, and stock index futures all expire simultaneously. This occurs in the months of March, June, September and December. There may be a large amount of trading as traders and investors attempt to close their positions in the option and/or the underlying stock. This may create a volatile market.
A slang market term for the last hour of a Friday on which quarterly contracts expire in stock futures, stock options and index options. The big volume on these contracts is on a quarterly basis with March, June, September and December expiry dates. Program traders adjust their positions on those dates and this process can cause volatility in underlying cash markets for equities. Those distortions can have a ripple effect on currency and fixed income markets.
Please see Triple witching day