Arnold & Porter

Arnold & Porter is a multinational law firm with its headquarters in Washington, D.C.. The firm maintains a significant global footprint with 16 offices worldwide, including key U.S. locations such as New York, Los Angeles, San Francisco, Chicago, Houston, Boston, Seattle, and Silicon Valley, alongside international offices in Amsterdam, Brussels, London, Seoul, and Shanghai. Recognized as a prominent BigLaw firm, Arnold & Porter ranked 51st on The American Lawyer's Am Law 200 for 2025, reporting over $1.19 billion in gross revenue for 2024 with approximately 959 attorneys. The firm was also recognized on The American Lawyer's A-List, ranking 6th in 2025. Chambers Global 2026 describes Arnold & Porter as an "impressive transatlantic firm" with "global coverage".

The firm's intellectual property litigation practice specializes in high-stakes patent cases across diverse technology and life sciences sectors. Their expertise spans pharmaceuticals, biotechnology, medical devices, consumer electronics, wireless technologies, telecommunications, IT, computers, software, semiconductors, and business methods. Notably, the firm handles Hatch-Waxman litigations in the life sciences sector. The firm’s tracked cases demonstrate its involvement in software, telecommunications, and consumer electronics, including representing clients in disputes concerning Wi-Fi standards, social media platforms, feature recognition technology, video streaming, and fleet management systems.

Arnold & Porter demonstrates a balanced approach in its patent litigation practice, representing both plaintiffs and defendants. The firm is well-equipped to defend market-leading companies, such as Samsung, Google, Nike, and Pfizer, against competitors or smaller plaintiffs. This is supported by an even distribution in its recent tracked cases, with two appearances on the plaintiff side and three on the defendant side. The firm emphasizes its capability in both enforcing and defending clients' IP rights across various subject matters.

The firm has achieved significant outcomes in prominent patent litigation matters. In 2025, Arnold & Porter secured a verdict of non-infringement for Charter Communications in the Eastern District of Texas, successfully defending against a claim seeking over $1 billion in damages related to video streaming patents. In a closely watched biotechnology case, the firm achieved a unanimous 9-0 victory for Sanofi-Aventis US and Regeneron Pharmaceuticals Inc. at the U.S. Supreme Court in May 2023, concerning the scope and validity of antibody patents and the enablement test. Additionally, in June 2024, an Arnold & Porter team secured a precedential win for BetMGM at the Federal Circuit, resolving a three-year patent infringement litigation involving GPS technology in online gaming. Other notable results include a $158 million verdict for Boston Scientific in 2023 for patent infringement related to endoscopic clips, and another case securing a $35 million jury verdict and a $180 million global settlement for Boston Scientific in transcatheter aortic valve litigation. The firm also successfully upheld a design patent for Crocs before the Federal Circuit.

Arnold & Porter possesses a robust PTAB and IPR practice, integrating these proceedings with district court litigation as part of its overall defense strategy. The firm is well-versed in America Invents Act (AIA) contested proceedings, including inter partes reviews (IPRs) and post-grant reviews (PGRs). Its attorneys have filed or defended over 280 IPRs, PGRs, and Covered Business Method (CBM) reviews, representing both petitioners and patent owners before the PTAB. The firm's patent prosecution team also has extensive experience across a wide range of technical fields and works collaboratively with its litigators to develop patents that withstand challenges.

Key partners in Arnold & Porter's IP litigation practice include Dina Hayes and Douglas Winthrop, who serve as co-chairs of the department. Other prominent practitioners are Matthew Wolf, recognized for his track record in IP trials, particularly in life sciences and technology; Deborah Fishman, who focuses on biopharma and medical device patent litigation; and Daniel L. Reisner, who served as lead counsel in the Charter Communications victory and was part of the team that secured the Supreme Court win for Sanofi and Regeneron. Michael A. Berta and Sean M. Callagy are also recognized for their roles in significant patent disputes.