"We were stunned by the attack, but there was never any question that we would reopen," said one of the managers of the Hyper Cacher store, Laurent Mimoun.
"It's very important to be here to show that we don't give up. It's a symbol," said Eric Cohen, father of supermarket worker Yohan Cohen, 20, who was murdered by the gunman Amedy Coulibaly on January 9.
Coulibaly was already believed to have shot dead a policewoman in another part of the capital before storming into the supermarket to show support for the Kouachi brothers, who by then were surrounded in a printing business outside Paris.
All three gunmen were killed later that day in near simultaneous operations by special forces.
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French Interior Minister Bernard Cazeneuve attended the reopening of the shop, which has been repaired after suffering heavy damage during the assault to kill Coulibaly and free the staff and shoppers he had taken hostage.
Cazeneuve bought wine and praised the "courageous" reopening of the shop, which "sends a signal that life is stronger."
A new team of staff is working at the kosher supermarket, while employees who survived the bloody attack are free to decide "their new posting in one of the group's stores," the management of the chain said.