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Flow-like signals including the ridge structure observed in small collisionsystems that are similar to those in large collision systems have led toquestions about the onset of collectivity in nuclear collisions. In this study,we use the string melting version of a multi-phase transport (AMPT) model withor without the sub-nucleon geometry for the proton to study multiparticlecumulants in $p+p$ collisions at 13 TeV. Both versions of the model producenegative $c_{2}\{4 \}$ values at high multiplicities. In addition, thedependence of $c_{2}\{4 \}$ on the parton cross section is non-monotonous,where only a range of parton cross section values leads to negative $c_{2} \{4\}$. Furthermore, the AMPT model with sub-nucleon geometry better describes themultiplicity dependence of $c_{2} \{4 \}$, demonstrating the importance ofincorporating the sub-nucleon geometry in studies of small collision systems.

A transport model study of multiparticle cumulants in $p+p$ collisions at 13 TeV