Horwitz's practice focuses on trademark litigation. During a 30-year career he has acted for clients including JPMorgan, IBM and Kraft.
King & Spalding is focusing on building its New York IP team, hiring patent litigator Richard Pettus from McDermott Will & Emery in January.
Baik specialises in engineering patent litigation and portfolio management.
Gary Weiss, Orrick IP head and managing partner of the Silicon Valley office, said: "The number and scope of patent litigation matters we're handling is increasing… in the US and throughout the world."