The Imaging X-ray Polarimetry Explorer (IXPE) mission was launched on December 9, 2021 and has observed a number of galactic and extragalactic X-ray sources. I report here on the IXPE observations of the High Mass X-Ray Binary Cyg X-1. IXPE detected a strong 2-8 keV polarization signal constraining the origin of the X-ray emission and the configuration of matter close to the Cyg X-1 black hole. I will furthermore discuss the IXPE observations of the magnetar 4U 0142+61 and their interpretation.