Magnetoresistance and Hall effect measurements in the narrow band gap semiconductor platinum antimonide, were made in pulsed magnetic fields from 10 to 200 kG at temperatures 2, 4.2, 77, and 300 °K. Quantum oscillations of magnetoresistance were observed at 2 and 4.2 °K. The experimental results compared with theory show that the valence band of PtSb2 is not spherical. As the Hall coefficient of PtSb2 is magnetic field‐independent it is possible to use PtSb2 samples in measurements of high magnetic fields at different temperatures.