Technology licensing agreements potentially can create future appropriabilityproblems. Drawing on the appropriability literature, we argue that the inclusion of a grantback clause in technology licensing agreements is an attempt to balance the gains from and protection of the focal firms’ technologies. We hypothesize that the closer the licensed technology is to the licensor’s core patented technologies, the more likely the licensing agreement will include a grant-back clause, while the closer the licensed technology is to the licensee’s core patent portfolio, the less likely the agreement will include a grant-back clause. We hypothesize also that technological uncertainty is a positive moderator in the decision to include a grant-back clau...