Usually, most data providers send out the last trade during market hours as the "close" for a stock. However, today I notice several data providers sending out after-hours quotes as the "closing price" which screws up end-of-day calculations. For example...X rth last was 51.07 Many services quote it at 51.30 which was an AH trade! Anybody notice this? Is there some official change I'm not aware of?