This study investigates the finite element analysis of steel–concrete composite beams with web openings using ATENA Science. Ten beams were modeled and analyzed, with nine containing web openings and one serving as a reference beam without openings. All specimens were fully shear-connected via shear studs. The main parameters studied include concrete flange thickness, reinforcement ratio, and opening height and length. Results indicate that web openings significantly reduce both load-bearing capacity and ultimate stiffness. The concrete slab above the opening carries most of the shear force across the section, contributing considerably to the section's shear capacity. Increasing the concrete flange thickness enhances load-bearing ability, while a higher reinforcement ratio improves deformation capacity. Wider openings substantially increase slip at the interface above the holes, and increasing the height of the openings results in greater shear load transfer to the concrete flange. It was observed that the CB4 concrete slabs carried between 60% and 69% of the total shear force; CB8 resisted about 60%, while CB10 showed a 54% increase in bearing capacity.