Ajnad Misr, or Soldiers of Egypt, were a group that emerged in January 2014 and targeted security forces in and around the Egyptian capital.
The group’s leader was killed by security forces in 2015, and many of its remaining members are held in custody.
The court referred its sentencing recommendation to the country’s top religious authority, the Grand Mufti, for a non-binding but legally required opinion.
Once that is received, the court will then formally announce its verdict on December 7, after which the sentence can be carried out.
Egypt is fighting an Islamist insurgency in Sinai that gained momentum in mid-2013 when the military ousted Muslim Brotherhood president Mohamed Mursi after protests against his rule.