https://www.cnbc.com/2018/07/26/facebook-is-on-pace-for-its-worst-day-ever.html > Facebook is on pace for its worst day as a public company after opening 19.6 percent down on a Q2 revenue miss and disappointing daily active user count. > Shares fell as low as $174.48 Thursday morning. The stock ended trading Wednesday at $217.50. You can follow the tick-by-tick changes on CNBC.