  We report the magnetotransport properties of HoSb, a semimetal with
antiferromagnetic ground state. HoSb shows extremely large magnetoresistance
(XMR) and Shubnikov-de Haas (SdH) oscillation at low temperature and high
magnetic field. Different from previous reports in other rare earth
monopnictides, kinks in $\rho(B)$ and $\rho_{xy}(B)$ curves and the field
dependent resistivity plateau are observed in HoSb, which result from the
magnetic phase transitions. The fast Fourier transform analysis of the SdH
oscillation reveals the split of Fermi surfaces induced by the nonsymmetric
spin-orbit interaction. The Berry phase extracted from SdH oscillation
indicates the possible nontrivial electronic structure of HoSb in the presence
of magnetic field. The Hall measurements suggest that the XMR originates from
the electron-hole compensation and high mobility.
