This document summarizes a research study analyzing the evolution of market share and final penetration rates of online travel agencies (OTAs) in Swiss hotel distribution channels. The study finds that except for mid-scale hotels, the final OTA share is below 40% for most hotel segments. Budget hotels currently have the highest OTA share but will reach saturation sooner. Upscale hotels may see a steadily increasing OTA share longer-term. The results suggest OTAs pose a serious threat to the majority of Swiss hotels. The dynamics in the hotel distribution landscape will remain highly complex with ongoing consolidation among OTAs and hotels as well as new players like TripAdvisor entering instant booking.