Apttus, Booker, Lattice Engines, Segment and Tubular Labs are the five hottest cloud-based marketing startups of 2015. 13 of the hottest 34 cloud-based marketing startups are from the Bay Area, followed by Los Angeles with 3, and Bangalore and New York, both with 2. 14 are in Pre Series A, 7 in A-Stage, 5 in B-Stage and 3 in C-Stage funding rounds.