Mergers & Acquisitions

Weil has helped advise clients on some of the largest and most innovative transactions in the marketplace. In the last year alone, Weil has advised on more than 100 transactions larger than $1 billion for clients in a range of sectors and geographies.

Download

Related:

Notable Representations, Key Contacts

Strategic Business Partners in Global M&A

At Weil, we partner with our clients and make it a priority to understand and appreciate their corporate organization and business strategy. We understand that any M&A transaction is part of this overarching strategy and can be the most significant business event in the history of an organization and in the lives of its executives. Our clients include the largest and most sophisticated public and private companies, boards of directors and special committees as parties on any side, and in any context, of the deal. Our decades of experience across industries and throughout geographies allow us to guide our clients through these transformative, and often complex, corporate events.
Our pragmatic, business-focused approach allows us to get the deal done. We offer clients solutions rather than simply pinpoint and analyze legal issues. Our record of success in volume, scope and size of deals speaks to the value we bring to a range of clients throughout the world daily.

Thinking Outside the Box

Clients come to Weil for M&A advice when the stakes are high and the typical game plan won’t do. Weil M&A lawyers know the playbook but also have the creativity, confidence and experience to know when to rewrite it. Our M&A team has done and seen it all – whether it’s navigating the turnover of a board mid-transaction; helping to bridge the valuation gap between buyer and seller; helping to turn a hostile deal into a friendly transaction; assessing and proactively addressing the complex regulatory schemes across jurisdictions; crafting a sophisticated cross-border joint venture structure to get a deal done in an inhospitable regime or jurisdiction; or juggling multiple contingent transactions for the same client simultaneously.

Boards of Directors, Special Board Committees and Governance

We represent Boards of Directors and Special Board Committees of companies ranging from the Fortune 100 companies to mid and smaller cap companies, including representations involving complex M&A transactions, takeover defense, actual or potential conflicts of interest, accounting issues, Sarbanes-Oxley compliance and other matters.

We have substantial experience assisting Boards of Directors and Special Board Committees with internal investigations, governmental investigations and litigation (including securities, class action and derivative litigations arising out of M&A transactions involving affiliated entities).

Nuanced Understanding of Activism and Takeover Defense

Weil has vast experience advising on sensitive matters involving hostile M&A, takeover defense, issues of shareholder activism and other efforts for corporate control. We take a multidisciplinary approach – which involves cross-disciplinary team efforts among our M&A, Public Company Advisory Group and Securities Litigation lawyers – and work successfully and proactively in situations involving all manner of active shareholders. We do not engage adversarially with active shareholders but rather seek to understand their objectives and help our clients work to achieve resolution that is successful to all parties.
Hostile M&A diagram

Significant Recent Global M&A Matters

Bell Canada

Brookfield Asset Management Inc.

The Campbell's Company

Cedar Fair

ChampionX

Dun & Bradstreet

DIRECTV

Dow

Eli Lilly and Company

Foundation Building Materials

The Home Depot, Inc.

The Kroger Company

NEOGEN Corporation

Sanofi

Vonage Holdings Corp.

Sunoco LP

Willis Towers Watson PLC

Key Contacts

Michael Aiello

Michael J. Aiello

Partner

New York

Matthew J. Gilroy

Matthew J. Gilroy

Partner

New York

Michael E. Lubowitz

Michael E. Lubowitz

Partner

New York

See list of lawyers globally

Shortcut Links

VIDEO: Barry Wolf speaks with David Avery-Gee, Co-Managing Partner of our London office. Among a range of topics, David shares insights about his compelling path to Weil, the growth and future of the London office, an outlook for transactions in the year ahead, and a Leader outside of the legal industry he admires.

Named a “Leading” Firm for Corporate/M&A

Chambers USA 2026; Chambers Global 2026; Chambers Europe 2026

M&A Partner Michael J. Aiello Ranked Band 1 for Corporate/M&A

Chambers Global 2026 and Chambers USA 2026

Ranked Tier 1 for M&A: Large Deals ($1bn+)

Legal 500 US 2026

Michael J. Aiello and Eoghan Keenan Named 2025 “Dealmakers of the Year”

The American Lawyer

Weil Named M&A “Practice Group of the Year”

Law360 2024

Michael J. Aiello Named a 2025 “Notable M&A Dealmaker”

Crain’s New York Business

Ranked Tier 1 in M&A Category in the United States for the 13th Year Running

IFLR1000 2025

It is an extremely capable team, with relevant experience far and wide.”

Chambers USA

They give practical advice and have fantastic problem-solving skills.”

Chambers USA

Awards and Recognition, Latest Thinking, Recent Announcements, Firm News & Announcements

Awards and Recognition

  • Weil Named a “Leading” Firm for Corporate/M&A, Global-wide and in the U.S., France and China Award Brief — Chambers Global 2026
  • Weil Named a “Leading” Firm for Corporate/M&A in the U.K. Award Brief — Chambers Europe 2026
  • Weil Named a "Leading" Firm for Corporate/M&A: The Elite in New York, Texas, California (San Francisco, Silicon Valley & Surrounding Areas) and the U.S. Award Brief — Chambers USA 2026
  • Weil Named a “Leading” Firm for Corporate/M&A in Massachusetts Award Brief — Chambers USA 2026
  • Weil Named “Leading” Firm for Corporate/M&A: £800 million and above in London Award Brief — Chambers UK 2026
  • Weil Ranked Tier 1 for M&A: Large Deals ($1bn+) Award Brief — Legal 500 2026
  • Weil Ranked Tier 1 for M&A in the U.S. for the 13th Year Running Award Brief — IFLR1000 2025
  • Weil Named a “Leading” Firm for M&A in New York, California, Massachusetts, and Texas Award Brief — IFLR1000 2025
  • Michael J. Aiello and Eoghan Keenan Named 2025 “Dealmakers of the Year” Award Brief — The American Lawyer — PDF
  • Michael J. Aiello Named a 2025 “Notable M&A Dealmaker” Award Brief — Crain's New York Business
  • Weil Named “France M&A Legal Adviser of the Year” Award Brief — Mergermarket European M&A Awards 2022

View all

Latest Thinking

View all

Firm News & Announcements

View all

▻
◅