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While stock options contracts and index options expire on the third Friday of every month, all four asset classes expire simultaneously on the third Friday of March, June, September and December

www.investopedia.com Escreveu:Quadruple Witching

Definition of 'Quadruple Witching'

The expiration date of various stock index futures, stock index options, stock options and single stock futures. All stock options contracts expire on the third Friday of each month and once every quarter - on the third Friday of March, June, September and December - all four asset classes expire on the same day. Because futures and options investors must close out of their positions on those days, they often witness increased trading volume.

Investopedia explains 'Quadruple Witching'

The term "witching" comes from the fact that in the past, the expiration of futures and options contracts occurred not only on the same day, but at the same time. This often resulted in a period of greater-than-normal market volatility, which became known as the "witching hour." Due to this increased volatility and frenzied market activity, many investors approach the markets differently on witching days.

ferreira10 Escreveu:Garfield; falta só mais um post; para passar a ser quadruple= a quatro posts.

Olha! fala por exemplo da PT.

mas nas ocasiões anteriores não observei nada de anormal no mercado.

Garfield Escreveu:Um último exemplo :

GALP nos ultimos 5 minutos salta de 12,75€ para fechar a 12,85€com um ganho de 2,07%

Efeitos dos produtos derivados...

Já há uns tempos atrás lembro me do JAS escrever sobre um movimento na Jeronimo Martins, salvo erro, que foi para investigação e como era de esperar não deu em nada, pelo menos até hoje.

BN
Garfield

What Effects Does Quadruple Witching Have?

Due to the combined effects of exercise, delivery, hedging, arbitrage as well as speculative options trading and futures trading activity during Quadruple Witching days, the most obvious effect is a dramatic increase in trading volume. In fact, it has been documented that in 2007, both stock and options trading volume during Quadruple Witching days rose by about 55% to 60% more than the daily average for the year. Even though there might be increased amount of volatility in certain stocks during Quadruple Witching, the overall stock market action does not look significantly different from a normal non Quadruple Witching day. Extrinsic value of further month options may be slightly higher than usual on the Thursday prior to Quadruple witching and on Quadruple witching Friday itself due to the increased amount of trading. Due to the increased intraday volatility, options traders holding longer term options positions using trailing stop loss or contingent orders may also experience unnecessary stop outs.

Atomez Escreveu:A volatilidade costuma ser mais alta e há por vezes movimentos "imprevistos" em alguns stocks.