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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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.
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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
- 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
- Protected: 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
- FTC Rebrands Zillow–Redfin Partnership as a “Pay‑to‑Exit” Deal Blog Post — WorthWeil Antitrust Blog — By Jasmine Rosner — October 14, 2025
- FTC Walks Away from Rulemaking— But Not the Fight on Non-Competes Alert — By Kristin Sanford, John P. Barry, Celine Chan, Geneva Torsilieri Hardesty and Mia Smutny — PDF — September 17, 2025
Firm News & Announcements
- Weil Supports Boeing in Securing Antitrust Approvals for the $4.7 Billion Acquisition of Spirit AeroSystems Deal Brief — December 09, 2025
- Weil Serves as Antitrust Counsel to Abbott in its ~$21 Billion Acquisition of Exact Sciences Deal Brief — December 04, 2025
- Bo Pearl Named Among Top Antitrust Lawyers for 2025 by Daily Journal Firm Announcement — December 03, 2025
- Weil Advises Silver Lake and its Portfolio Company, Cegid, on the Acquisition of Shine Deal Brief — December 01, 2025
- Weil Advises Brookfield in $900M Acquisition of Fosber Deal Brief — December 01, 2025
- Weil Elects 17 New Partners and Announces New Counsel Class Press Release — November 25, 2025