Castellanos & Co is an active intellectual property practice group in Colombia that is known to provide counsel on patent and trade mark registrations, as well as opposition, nullity proceedings and infringement cases. Castellanos & Co is frequently retained by players from the fashion, biotechnology and pharmaceutical industries.

Margarita Castellanos is praised by interviewees, and one of them comments: "Margarita Castellanos is a very experienced IP lawyer that provides clients with innovative approaches to their problems in Colombia." Another market commentator adds: "She is diligent, competent, knowledgeable, and friendly."

Ximena Castellanos comes highly commended by interviewees for her well-established intellectual property practice in Colombia. One observer notes: "We have had a great experience working with Ximena Castellanos." Another commentator affirms: "She is a very devoted lawyer."