Antitrust
Notable Representations, Key Contacts
Weil’s global Antitrust team provides clients with the international reach and extensive expertise required to handle complex and rapidly shifting antitrust and foreign investment rules around the world. Our team has a proven track record of achieving successful and innovative outcomes for clients across the full range of transactional and behavioral antitrust and foreign investment matters.
“An exceptional group of attorneys with deep experience representing clients before government agencies.”
Antitrust M&A:
With our deep experience in handling complex cross-border merger review processes and our position at the forefront of shaping antitrust policy, Weil has been trusted to provide effective global strategic counseling, agency representation, and litigation defense for many of the largest, highest-profile transactions in recent years.
Antitrust Litigation:
Weil has a strong reputation for successfully defending clients in their most high-stakes civil and criminal antitrust litigations, achieving the best outcomes at trial and on appeal in respect of the full range of cutting-edge antitrust issues, with particular success in class action litigations.
Cartels & Investigations:
With our deep expertise and global reach, Weil is regularly called upon by clients across the globe to guide them through all phases of criminal and civil cartel investigations. We have consistently obtained favorable results, earning the practice recognition among the top cartel defense firms in the world.
Global Recognition
50
Awards and Recognition, Speaking Engagements, Latest Thinking, Firm News & Announcements
Awards and Recognition
- Weil Named “Litigation Department of the Year, Antitrust” Award Brief — National Law Journal Legal Awards 2025
- Weil Named for “Antitrust Firm of the Year” Award Brief — LMG Life Sciences 2025
- Weil’s Work on Novartis Pharma et al v Regeneron Pharmaceuticals Named “Litigation of the Year – Non-Cartel Prosecution” Award Brief — GCR Awards 2025
- Weil Ranked a Top Firm for Civil Litigation / Class Actions: Defense Award Brief — Legal 500 US 2025
- Weil Ranked a Tier 1 Firm for Merger Control Award Brief — Legal 500 US 2025
Speaking Engagements
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Urge to Merge? CPG M&A Strategy and Risk in Today’s Antitrust Landscape
Speaker(s):
Meagan Bellshaw and
Mark Seidman
January 22, 2026 — Weil Antitrust partners Meagan Bellshaw and Mark Seidman hosted a webcast with Consumer Brands Association discussing how CPG brands can navigate antitrust risk, the mindset of the nations' top competition and consumer protection regulators, litigation strategy, how to structure deals more defensibly, and develop strategy in response to enforcement trends at both federal and state levels.
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Big Tech, Big Enforcement? Impacts of recent enforcement initiatives
Speaker(s):
Meagan Bellshaw
November 18, 2025 — Weil Antitrust Partner Meagan Bellshaw moderated a panel at GCR: Women in Antitrust in DC. The panel discussed takeaways from recent tech enforcement cases, the impact of AI and AI agents on markets and gatekeepers, and the Digital Markets Act and its implementation.
Latest Thinking
- UK government sets out CMA reform agenda: Faster, fairer mergers or opening the door to political interference? Blog Post — WorthWeil Antitrust Blog — By Jenine Hulsmann, Annagiulia Zanazzo and Chris Chapman — January 23, 2026
- Adjustments to the HSR Act Filing Thresholds, Fee Structure, and Interlocking Directorate Thresholds Alert — By Michael C. Naughton, Carla A. R. Hine, Marie-Marie O. de Fays and Dan S. Nobil — PDF — January 16, 2026
- Will It Stick? FTC Breaks From its Administrative Process, Seeks a Permanent Injunction in Federal Court for Liquid Nails Merger Blog Post — WorthWeil Antitrust Blog — By Mark Seidman and Meghana Appalaraju — January 15, 2026
- Lettuce Talk About Price Fixing: White House Targets Price Fixing in the Food Supply Chain Blog Post — WorthWeil Antitrust Blog — By Jasmine Rosner — December 22, 2025
- From Capped Pay to Locked Away: Wage-Fixing Prosecution Leads to Prison Sentence Blog Post — WorthWeil Antitrust Blog — By Lucy Fasano and Ignacia Vasquez — December 18, 2025
Firm News & Announcements
- Weil Shortlisted for Four Honors at GCR Awards 2026 Firm Announcement — February 02, 2026
- Weil Advised OneSource Virtual in Strategic, Majority Growth Investment from TA Associates Management Deal Brief — February 02, 2026
- Eighteen Weil Partners Named to 2026 Lawdragon 500 Leading Global Antitrust & Competition Lawyers Firm Announcement — January 23, 2026
- Weil Advises GHK Capital Partners in the Sale of ITS Logistics Deal Brief — January 21, 2026
- Weil Advised Goldman Sachs Alternatives in $280M Continuation Vehicle for Point72 Fintech Assets Deal Brief — January 15, 2026
- Weil Secures Court Approval of Special Master’s Recommendation for Sale of CITGO to Amber Firm Announcement — January 14, 2026