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
Speaker(s):
Carla A. R. Hine
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
- Piqued My Interest: Insights from the Antitrust Division’s Recent Statements of Interest Blog Post — WorthWeil Antitrust Blog — By Meagan Bellshaw, Charlotte McFaddin and Jordan Fason — April 16, 2026
- Hart Scott Rodino Filing Requirements Change as of March 19, 2026 Alert — Antitrust — By Michael C. Naughton and Carla A. R. Hine — PDF — March 19, 2026
- Expanded HSR Filing Requirements Remain in Effect Until Further Notice Alert — Antitrust — By Michael C. Naughton and Carla A. R. Hine — PDF — February 20, 2026
- Ready, Settle, Go! FTC and DOJ agree to three merger settlements in one week Blog Post — WorthWeil Antitrust Blog — By Megan A. Granger and Drew Cypher — February 17, 2026
- Federal Court Strikes Down Expansive HSR Filing Requirements... For Now Alert — Antitrust — By Michael C. Naughton, Mark Seidman, Carla A. R. Hine and Katya Dajani — PDF — February 13, 2026
Firm News & Announcements
- Weil’s German Expansion Continues with Two More Influential Partner Hires, Fueling Growth of Global Antitrust Platform Press Release — April 21, 2026
- Weil Advises Sumeru Equity Partners in its Strategic Growth Investment in K1x Deal Brief — April 20, 2026
- Sixteen Weil Partners Shortlisted for Euromoney’s 2026 Women in Business Law Americas Awards Firm Announcement — April 03, 2026
- Weil Advises Primoris in $422M Acquisition of PayneCrest Electric Deal Brief — March 31, 2026
- Weil Advises Noteholders on Comprehensive Recapitalization of Maxeda DIY Group Firm Announcement — March 30, 2026
- Weil Awarded 2026 Concurrences Antitrust Writing Award in Europe Business Article Category Firm Announcement — March 25, 2026