Free, Basic and Extra members will see charts that are based on data that is at least 15-minutes delayed.  If price data from the BATS exchange is available, those members will see charts that include non-delayed data from the BATS exchange during the first 15- or 20-minutes.  (More details)

ExtraRT and PRO members will see charts that are based on non-delayed data.

In all cases, it is possible that high-speed, dedicated data feeds may have data that is updated slightly ahead of the data on our charts because of the nature of the Internet.