  We analyze and compare the satellite halo populations at $z\sim2$ in the
high-resolution cosmological zoom-in simulations of a $10^{12}\,{\rm
M}_{\odot}$ target halo ($z=0$ mass) carried out on eight widely-used
astrophysical simulation codes ({\sc Art-I}, {\sc Enzo}, {\sc Ramses}, {\sc
Changa}, {\sc Gadget-3}, {\sc Gear}, {\sc Arepo-t}, and {\sc Gizmo}) for the
{\it AGORA} High-resolution Galaxy Simulations Comparison Project. We use
slightly different redshift epochs near $z=2$ for each code (hereafter
``$z\sim2$') at which the eight simulations are in the same stage in the target
halo's merger history. After identifying the matched pairs of halos between the
{\it CosmoRun} simulations and the DMO simulations, we discover that each {\it
CosmoRun} halo tends to be less massive than its DMO counterpart. When we
consider only the halos containing stellar particles at $z\sim2$, the number of
satellite {\it galaxies} is significantly fewer than that of dark matter halos
in all participating {\it AGORA} simulations, and is comparable to the number
of present-day satellites near the Milky Way or M31. The so-called ``missing
satellite problem' is fully resolved across all participating codes simply by
implementing the common baryonic physics adopted in {\it AGORA} and the stellar
feedback prescription commonly used in each code, with sufficient numerical
resolution ($\lesssim100$ proper pc at $z=2$). We also compare other properties
such as the stellar mass$-$halo mass relation and the mass$-$metallicity
relation. Our work highlights the value of comparison studies such as {\it
AGORA}, where outstanding problems in galaxy formation theory are studied
simultaneously on multiple numerical platforms.
