2409 Silvia Sabotta Planets around M dwarfs: occurrence rates from RV surveys and challenges for core accretion Starting with HARPS almost a decade ago, our community gathered enough data to obtain planet occurrence rates for low-mass stars. In our talk, we will present our updated CARMENES occurrence rates of 239 M dwarfs, as well as a direct comparison with a theoretical planet population obtained from the Bern model of planet formation and evolution. We will discuss the various biases that may impede this comparison and show preliminary results from a homogeneous sample of very low mass stars of less than 0.2 solar masses. We observe an overabundance of giant planets around our lowest mass stars as compared to the synthetic planet population, although the discrepancy is reduced when the modeled planet migration is suppressed. Potentially related to this, we find a surplus of short-period planets in this subsample, hinting at a stellar mass-dependent migration barrier at work. Our results highlight the importance of taking into account stellar host mass when studying planet formation.