^vvix
lots of days with null data
69th
ranked

Hello Joe,
Thanks for your post! We see that we are missing historical data on 9/21/18 and have reported that to our Engineers. If you continue to see missing historical data, please report it to our Yahoo Finance specialists here: https://io.help.yahoo.com/contact/index?page=home&locale=en_US&y=PROD_FIN.
Have a great day!
Regards,
Yahoo Finance