Theory developments beyond the Standard Model at colliders

Collider searches are the primary way to probe new physics at the GeV and TeV scale. While the LHC experiments have already collected an amount of data that is unprecedented at hadron colliders, this represents only a small fraction of the total integrated luminosity that they are expected to reach over their lifetime. New particles which may be discovered in future searches may have escaped detection so far if they are very heavy, very weakly coupled or lead to signals with very large backgrounds. In this talk, I will discuss developments in beyond the Standard Model theory at the LHC and other colliders highlighting each of these possibilities.