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
-
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.
-
Merger Remedies: The Fix is In (Again)
Speaker(s):
Kristin Sanford,
Jasmine Rosner,
Annagiulia Zanazzo and
Emma T D'Arpino
October 29, 2025 — Weil Antitrust partners Kristin Sanford and Jasmine Rosner, counsel Annagiulia Zanazzo and associate Emma D’Arpino served as panelists on a webinar hosted by the ABA’s Antitrust Law Section to discuss the return of merger remedies in recent antitrust enforcement.
Latest Thinking
- 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
- FTC Picks a Fight with the Fix—and Loses: What GTCR/Surmodics Means for Merger Remedies Going Forward Blog Post — WorthWeil Antitrust Blog — By Mark Seidman, Melissa Bredbenner and Yousef Ziyadi — December 03, 2025
- FTC Loses Challenge to Meta’s Instagram and WhatsApp Deals: Agency Fails to Prove Monopoly in a Fast-Paced Landscape Alert — By Jasmine Rosner and Rebecca Jacobson — PDF — November 25, 2025
- The CMA’s 4Ps mergers reform: Are promises turning into practice? Blog Post — WorthWeil Antitrust Blog — By Jenine Hulsmann, Annagiulia Zanazzo and Phoebe Murray — November 19, 2025
Firm News & Announcements
- Weil Secures Court Approval of Special Master’s Recommendation for Sale of CITGO to Amber Firm Announcement — January 14, 2026
- Weil Advised TruArc Partners in Acquisition of Schill Grounds Management Deal Brief — January 13, 2026
- Weil Advised Blackstone in $400M Series F Funding for Cyera Firm Announcement — January 09, 2026
- Weil Advises TPG in Long-Term Strategic Partnership with Jackson Financial Deal Brief — January 06, 2026
- Weil Advised Pacific Avenue Capital Partners, Alongside Cameron Ashley Building Products, in Acquisition of Therm-All from Incline Equity Partners Deal Brief — January 06, 2026
- Weil Advises Sanofi in its $2.2 Billion Acquisition of Dynavax Deal Brief — December 24, 2025