Nasdaq provides premarket quotes and activity data. Go to the Nasdaq website, and click on the Markets tab at the top. A drop-down menu appears with Pre-Market Activity or After Hours Activity near the top.
Clicking on Pre-Market Activity takes you to a separate webpage with a search box where you can type in the ticker symbol of the particular stock or index that you want information on. Doing so takes you to another page with information on the premarket volume, the premarket high and the premarket low. Note that premarket information is only available from 4:15 a.m. to 9:30 a.m. Eastern Standard Time, states Nasdaq.