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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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 panelist on a webinar hosted by the ABA’s Antitrust Law Section to discuss the return of merger remedies in recent antitrust enforcement.
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Antitrust Enforcement Under the Trump Administration – The First 100 Days: Reading Between the Headlines & What Lies Ahead
Speaker(s):
Meagan Bellshaw,
Jasmine Rosner and
Mark Seidman
May 8, 2025 — Weil Antitrust partners Meagan Bellshaw, Jasmine Rosner, and Mark Seidman hosted a webcast discussing the antitrust enforcement landscape over the first 100 days of President Trump's second administration and predictions on what to expect in the future.
Latest Thinking
- 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
- Protected: EU Merger Guidelines Review: Responses are in Blog Post — WorthWeil Antitrust Blog — By Niklas Maydell, Jenine Hulsmann, Chris Chapman, Nicholas Barnabo, Lucy Chambers and Alexandra Zaytseva — September 10, 2025
- Weil's 2024 SCOTUS Term in Review Publication — By Zack Tripp, Robert B. Niles-Weed, Josh Wesneski, Sebastian Laguna, Anthony Kakoyannis, Joseph Nelson, Laurel L. Zigerelli and Natalie Komrovsky Trujillo — PDF — September 04, 2025
- The EU Foreign Subsidies Regulation: the first two years under review Blog Post — WorthWeil Antitrust Blog — By Niklas Maydell, Chris Thomas and Chris Chapman — August 21, 2025
Firm News & Announcements
- Weil Advises Dycom Industries in its $1.95B Acquisition of Power Solutions Deal Brief — November 19, 2025
- Weil Advised OMERS in Sale of Epiq’s Global Business Transformation Solutions Division to K2 Services Deal Brief — November 10, 2025
- Weil Earns 2025 NLJ D.C. Litigation Departments of the Year: Antitrust Honors Firm Announcement — November 06, 2025
- Weil Advises Advent International in $800M Sale of Lanteris Space Systems to Intuitive Machines Deal Brief — November 04, 2025
- Weil Advised PSG on PatientNow’s Acquisition of Recura Deal Brief — November 03, 2025
- Weil Advises Convex Insurance and PSP Investments on Convex’s New Long Term Ownership Structure Led by Onex Corporation and American International Group, Inc. Deal Brief — October 30, 2025