TWTR July 31, 37 Calls: Previous close 2.00, Today's open 2.04. Today's low 1.86. Today's high 2.23. Today's last trade 2.15. TWTR July 31, 34 Puts: Previous close 1.33, Today's open (and LOD) 1.26. Today's HOD 2.47. Today's last trade 1.87.