How many movies have Rob de Groot and Sylvester Stallone collaborated on?

They have worked on 4 movies together! Their first movie together was Guardians of the Galaxy Vol. 2 (2017) while their highest rated movie together was Guardians of the Galaxy Vol. 3 (2023). They have not worked together since Guardians of the Galaxy Vol. 3 (2023). They are most known for their action films together.