SAN FRANCISCO — Venable’s new San Francisco office is adding a commercial litigation partner from Arnold & Porter.

Angel Garganta represents financial institutions, manufacturers and service companies in unfair business practice, consumer class action and commercial disputes. At Venable, he’ll be joining commercial litigator Thomas Wallerstein, who came aboard when the office opened in October, office chairman James Nelson and corporate partners Arthur Cirulnick and Michelle Ontiveros Gross. Garganta’s move marks a split from his longtime colleague Trenton Norris. The duo joined McCutchen Doyle Brown & Enersen about a decade before it merged with Boston’s Bingham Dana in 2002. Then, in 2008, they moved with IP litigator Monty Agarwal to Arnold & Porter’s San Francisco office, which had opened three years prior. The three helped build out the NorCal post for the D.C.-based firm, Garganta said. Norris and Garganta have recently defended food companies sued over allegedly deceptive labels in so-called food court cases.