When on expiration Friday are the Index (SPX, NDX , RUT) and ETFs (SPY, QQQQ, IWM) settlement prices finalized?
The settlement prices for the Index’s are determined by CBOE once all stocks in the index are opened for trading. This is usually by 9:45 ET, but CBOE doesn’t publish the prices until around noon. You can check settlement prices at the CBOE website. The ETFs final prices are set at the end of trading on expiration Friday.