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 a "Leading" Firm for Competition/Antitrust (international & cross-border) - USA Award Brief — Chambers Global 2026
- Weil Named a "Leading" Firm for Antitrust: Cartels - USA Award Brief — Chambers Global 2026
- Weil Named a "Leading" Firm for Competition/Antitrust - USA Award Brief — Chambers Global 2026
- Weil Named a "Leading" Firm for Competition/Antitrust - Global: Multi-Jurisdictional Award Brief — Chambers Global 2026
- Weil Named “Litigation Department of the Year, Antitrust” Award Brief — National Law Journal Legal Awards 2025
Speaking Engagements
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Mergernomics: How Tariffs Redefine Product Markets
April 6, 2026 — Weil Antitrust counsel Carla Hine spoke on the ABA Antitrust Law Section podcast, Trust and Trade, with economist Dr. Craig Malam joining host Anant Raut to discuss the effect of the Trump Administration's tariff-centric trade policy on how we determine the edges of a product market and what constitutes a substitutable product.
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Hybrid Relationships: Cartel or Collaboration?
Speaker(s):
Adam C. Hemlock
March 25, 2026 — Weil Antitrust partner Adam Hemlock moderated a panel at the ABA Antitrust Spring Meeting discussing recent cases, enforcement trends, and tips for counseling clients in this complex area.
Latest Thinking
- Mind the Threshold: FTC Sets a New Record for HSR Enforcement Blog Post — WorthWeil Antitrust Blog — By Mark Seidman, Jasmine Rosner and Nya Gavin — July 27, 2026
- Same as the Old Boss? Trump v. Slaughter and the End of FTC Independence Blog Post — WorthWeil Antitrust Blog — By Mark Seidman and John McDaniel — July 09, 2026
- What Consent Decree Trends Mean For Deal Clearances Publication — Law360 — By Kristin Sanford, Christina Swiatowy, Mia Smutny and Yousef Ziyadi — July 09, 2026
- A Merger Plot Twist: DOJ Credits Paramount/Warner Bros. With Boosting Competition Blog Post — WorthWeil Antitrust Blog — By Megan Granger, Mark Seidman and Caren N Andrango Espin — June 15, 2026
- Tighter Borders, Higher Stakes: The EU’s Revamped FDI Regulation and the Draft Industrial Accelerator Act Blog Post — WorthWeil Antitrust Blog — By Niklas Maydell, Álvaro Salgado and Matthew Fader — June 09, 2026
Firm News & Announcements
- Weil Advises Paprec Group on the Acquisition of a Majority Stake in Brantner Green Solutions Deal Brief — August 11, 2026
- Weil Secures Dismissal for Duke Energy in Proposed Nuclear Industry Wage-Fixing Class Action Litigation Win — August 06, 2026
- Weil Advises Antin on the Sale of a Minority Stake in Sølvtrans to GLIL Deal Brief — August 05, 2026
- Weil Advises Brookfield in the Completion of Its Acquisition of Oaktree Deal Brief — August 03, 2026
- Weil Advises MarketAxess in its $6B Acquisition by Intercontinental Exchange Deal Brief — July 30, 2026
- Weil Advises CBIZ, Inc. in its $5B Sale to Grant Thornton Advisors LLC Deal Brief — July 30, 2026