Embodiments of the present invention provide methods, systems, apparatuses, and computer program products for extending an action vector. In one embodiment, an apparatus is configured to scan each client action vector cell of the client action vector to identify an empty client action vector cell, the client action vector associated with a client profile; upon identifying an empty client action vector cell, extract an empty client action vector cell device rendered object category; retrieve, from a similarity table, a similarity measure for each of the other device rendered object categories of the plurality of device rendered object categories, the similarity measure being in comparison to the empty client action vector cell device rendered object category; for each of the other device rendered object categories of the plurality of device rendered object categories having a similarity measure above a similarity threshold, extract an action count from the client action vector cell associated with the device rendered object category; compute a similarity action measure for the device rendered object category based at least on the action count and the similarity measure; and compute an action measure for the empty client action vector cell using at least one of the similarity action measures; and increment an action count in the empty client action vector cell based on the action measure.