This article describes the construction of branched. ROMP-polymer architectures via polycondensation of AB(n)-type macromonomers. For this convergent strategy, a polymer was synthesized that carries several hydroxyl-groups along the polymer chain and one carboxylic acid group at the chain end. An esterification reaction between these functional groups yielded long-chain branched polymers. The polymers were analyzed by NMR and SEC to monitor the condensation reaction. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A. Polym Chem 47 6932-6940, 2009