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We study $\mathcal{N} = 3$ supersymmetric Chern-Simons-matter theory coupledto matter in the fundamental representation of $SU(N)$. In the 't Hooft large$N$ limit, we compute the exact $2 \to 2$ scattering amplitudes of thefundamental scalar superfields to all orders in the 't Hooft coupling$\lambda$. Our computations are presented in $\mathcal{N} = 1$ superspace andmake significant use of the residual $SO(2)_R$ symmetry in order to solve forthe exact four-point correlator of the scalar superfields. By taking theon-shell limit, we are able to extract the exact $2 \to 2$ scatteringamplitudes of bosons/fermions in the symmetric, anti-symmetric and adjointchannels of scattering. We find that the scattering amplitude of the$\mathcal{N} = 3$ theory in the planar limit is tree-level exact to all ordersin the 't Hooft coupling $\lambda$. The result is consistent with theconjectured bosonization duality and is expected to have enhanced symmetrystructures such as dual superconformal symmetry and Yangian symmetry.

Scattering Amplitudes in $\mathcal{N} = 3$ Supersymmetric $SU(N)$ Chern-Simons-Matter Theory at Large $N$