Astronomical and cosmological observations support the existence of invisible matter that can only be detected through its gravitational effects, thus making it very difficult to study. Dark matter (DM) makes up about 27% of the known universe. Experiments like the Large Hadron Collider (LHC) of the CERN laboratory searches new particles that can explain dark matter. DM production consists of an excess of events with a single final-state object X recoiling against large amounts of missing momentum of energy (MET) called mono-X signal (X=jet,Z,W,H, top). Recent results of mono-X searches employed by the ATLAS and CMS collaborations are presented. Showing that the SM predictions are consistent with the observed data in all search channels.