Counsel registry
Williams & Connolly
14 case appearances — 13 as plaintiff counsel · 1 as defendant counsel.
Firm overview
Williams & Connolly LLP is a premier litigation firm headquartered in Washington, D.C., recognized for handling complex, high-stakes matters with a single office footprint and approximately 400 attorneys. The firm is consistently ranked among the top law firms nationally, including a Vault Law 100 ranking of #17 and strong recognition by Chambers USA across various litigation categories, including Intellectual Property.
The firm's robust intellectual property practice is frequently retained by major global institutions in significant disputes. Williams & Connolly specializes in patent litigation, demonstrating particular strength in life sciences, notably pharmaceutical and biotechnology cases, including extensive Hatch-Waxman litigation. Beyond pharmaceuticals, the firm also handles technology-related patent disputes for clients such as Google, Samsung, and Intel. While the firm's tracked cases primarily reflect plaintiff-side representation (12 plaintiff appearances, 0 defendant appearances), external reports indicate they also vigorously defend clients in patent infringement and related proceedings, including for major technology and pharmaceutical companies.
Williams & Connolly has achieved notable outcomes in significant patent litigation. The firm secured a major victory for Regeneron Pharmaceuticals, Inc. against Amgen Inc. in May 2025, where a jury found Amgen liable for antitrust and tort violations related to a drug bundling scheme, awarding Regeneron over $400 million in damages. In February 2026, the firm successfully defended Motive Technologies, Inc. in an ITC investigation, with the International Trade Commission affirming that Motive did not infringe any valid Samsara patent claims. The firm also represented Genevant Sciences, achieving a $2.25 billion settlement in a COVID-19 patent litigation case in March 2026.
The firm possesses a notable Patent Trial and Appeal Board (PTAB) practice, having handled over 100 inter partes review (IPR) proceedings. Chambers USA recognizes Williams & Connolly in the "Intellectual Property: Patent Trial and Appeal Board" category. In a significant PTAB victory for Pfizer in March 2025, the firm successfully invalidated two of Moderna's mRNA platform patents asserted in infringement litigation. Key partners in the firm's IP litigation practice include David I. Berl, who co-chairs the IP practice and is highly ranked for patent litigation and PTAB expertise, along with Joseph G. Petrosinelli, Andrew V. Trask, and Jessamyn Berniker.
Attorneys
Roles
- Lead Counsel22
- lead counsel16
- Counsel16
- counsel11
- Of Counsel7
- Lead Counsel (Liaison Counsel in MDL)1
- Liaison Counsel (in MDL)1
Cases (14)
- π plaintiffAstellas Pharma Inc. et al. v. Various ANDA FilersDavid M. Krinsky · Lead Counsel
- π plaintiffAstellas Pharma Inc. et al. v. Zydus Pharmaceuticals (USA) Inc. et al.David Berl · Lead Counsel
- π plaintiffAstellas US LLC et al. v. Dr Reddys Laboratories LtdDavid M. Berl · Lead Counsel
- π plaintiffMotive Technologies, Inc. v. Samsara, Inc.Joseph G. Petrosinelli · lead counsel
- π plaintiffMotive Technologies, Inc. v. Samsara, Inc.Joseph G. Petrosinelli · Lead Counsel
- Δ defendantMultifold International Incorporated Pte. Ltd. v. Google LLCAndrew V. Trask · Lead Counsel
- π plaintiffRegeneron Pharmaceuticals Inc. v. Unnamed DefendantDavid I. Berl · Lead Counsel
- π plaintiffRegeneron Pharmaceuticals, Inc. v. Amgen Inc.David I. Berl · Lead Counsel (Liaison Counsel in MDL)
- π plaintiffRegeneron Pharmaceuticals, Inc. v. Celltrion, Inc.David I. Berl · Lead Counsel
- π plaintiffRegeneron Pharmaceuticals, Inc. v. Formycon AGDavid I. Berl · lead counsel
- π plaintiffRegeneron Pharmaceuticals, Inc. v. Mylan Pharmaceuticals Inc. et al.David I. Berl · Lead Counsel
- π plaintiffRegeneron Pharmaceuticals, Inc. v. Sandoz Inc.David I. Berl · lead counsel
- π plaintiffSTARBUCKS CORPORATION et al. v. Pi Design AGLisa S. Blatt · Counsel
- π plaintiffUntitled caseDavid M. Krinsky · lead counsel