Breaking: As the markets continue to tank [at this writing the dow is down 719 points] CNBC and Fox Business are blowing out their regular programming and staying live until 11pmET tonight.

• Tonight's Programming Changes

FNC —
5pm - Alexis Glick co-anchors with Heather Nauert.

FBN —
Until 6 - Liz Claman and David Asman.
6pm - Neil Cavuto.
7pm - Asman and Dagen MCDowell.
8pm - Dave Ramsey
9pm - Cavuto anchors "Your Money, Your Questions," with viewer phone calls and emails.
4am Tuesday - FBN begins one hour earlier

CNBC —
8pm - Maria Bartiromo.
9pm - Mark Haines and Erin Burnett.
1am Tuesday - Squawk Box Europe
4am Tuesday - Worldwide Exchange
5am Tuesday - Squawk Box (beginning one hour earlier)

(all times ET)