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
-
Urge to Merge? CPG M&A Strategy and Risk in Today’s Antitrust Landscape
Speaker(s):
Meagan Bellshaw and
Mark Seidman
January 22, 2026 — Weil Antitrust partners Meagan Bellshaw and Mark Seidman hosted a webcast with Consumer Brands Association discussing how CPG brands can navigate antitrust risk, the mindset of the nations' top competition and consumer protection regulators, litigation strategy, how to structure deals more defensibly, and develop strategy in response to enforcement trends at both federal and state levels.
-
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.
Latest Thinking
- 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
- A Million Reasons to Report: The DOJ’s Antitrust Whistleblower Rewards Program in Action Blog Post — WorthWeil Antitrust Blog — By Adam C. Hemlock, Rachel Williams and Arlinda Shehu — February 11, 2026
- Achy Breaky Heart: The FTC Blocks Edwards-JenaValve Aortic Device Deal Blog Post — WorthWeil Antitrust Blog — By John E. Scribner, Sierra Anderson and Matt Tonglet — February 09, 2026
Firm News & Announcements
- Weil Advises Veris Residential in $3.4B Sale to Investor Consortium Deal Brief — February 23, 2026
- Sixteen Weil Partners Named to 2026 Lawdragon 500 Leading Global Entertainment, Sports & Media Lawyers Firm Announcement — February 20, 2026
- Weil Achieves High Rankings in Chambers France 2026 Firm Announcement — February 20, 2026
- Weil Advises Blackstone in Acquisition of Champions Group Deal Brief — February 17, 2026
- Weil Advises Paradigm, an OMERS Portfolio Company, in its Sale to Patient Square Capital Deal Brief — February 13, 2026
- Weil Earns High Rankings in Chambers Global 2026 Firm Announcement — February 13, 2026