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Sullivan & Cromwell

United States (National)

2027_BM US_Tier 1 Firm.svg
Key practice areas
Intellectual property
Trade mark
Patent
IP transactions
IP transactions
Bankruptcy
Labor and employment
Intellectual property
Dispute resolution
International arbitration
White collar crime
Securities
Competition/antitrust
Commercial
Labor and employment
Firm overview

Sullivan & Cromwell LLP provides the highest quality legal advice and representation to clients around the world. The results the firm achieves have set it apart for more than 140 years and have become a model for the modern practice of law. Today, S&C is a leader in each of its core practice areas and in each of its geographic markets. The firm advises a diverse range of clients on major domestic and cross-border M&A and corporate finance transactions, high-stakes litigation and corporate investigations and complex regulatory, tax and estate planning matters. Headquartered in New York, S&C comprises more than 875 lawyers who serve clients around the world through a network of 13 offices, located in leading financial centers in Asia, Australia, Europe and the United States.


Main Areas of Practice:

Antitrust: Sullivan & Cromwell represents clients across a broad array of industries and in multiple jurisdictions in merger clearances, criminal antitrust investigations and civil litigation. The firm handles merger clearances for some of the largest and most complex M&A transactions in the world. 


Capital Markets:
S&C leads global rankings in both volume and value of offerings and on its ability to structure novel and effective transactions in the representation of issuers, underwriters, selling and controlling shareholders, and other market participants globally.


Corporate Governance:
S&C’s corporate governance practice draws from across the firm’s preeminent practice areas for a thorough understanding of evolving corporate governance requirements and practices. 


Estates & Personal:
S&C provides comprehensive and customized service to individuals, families, trustees and charitable institutions on a range of sensitive business and personal affairs. The practice includes all aspects of non-US and US transactional matters, and cross-border trusts and estates litigation.


Executive Compensation/ERISA:
S&C advises on a full range of corporate, securities, tax and employment law matters. The firm’s lawyers represent many of the largest global companies on employment arrangements, corporate governance, succession matters and incentive compensation plan design, as well as senior executives in negotiations.


Financial Services:
S&C remains the leading global law firm on transactional, regulatory, enforcement and other matters affecting financial institutions. The firm’s expertise extends to clients in the banking; broker-dealer; commodities; futures and derivatives; insurance; and investment management sectors. 


Intellectual Property & Technology:
S&C assists clients globally with the full spectrum of intellectual property and technology issues, including in significant M&A transactions, complex patent and other IP disputes, as well as in licensing matters.


Investment Management:
S&C combines a traditional investment management and an alternative investment management practice to provide expertise in transactional, structuring, trading, advisory and regulatory matters. 


Litigation:
S&C’s litigators take a global, multidisciplinary approach to every aspect of litigation and regulatory matters, making it the go-to firm for cross-border litigation, a practice strengthened by S&C’s stellar reputation as a corporate, financial and transactional firm.


Mergers & Acquisitions:
S&C mobilizes teams of lawyers worldwide for clients
on their largest and most important domestic and cross-border M&A transactions.
A perennial leader in M&A, S&C ranks first by value among law firms over the last 20 years, having acted in over $9 trillion in announced transactions worldwide.


Private Equity:
S&C’s private equity practice draws upon the integrated resources and efforts of S&C offices around the world, taking advantage of the firm’s preeminent global capabilities to advise private equity firms, family offices, sovereign wealth funds and other investors of private capital on their most important and complex acquisitions, strategic investments and exits, across a broad range of industries.


Project Development & Finance; Infrastructure:
S&C is a leader in project and infrastructure development and finance. The firm has advised on many of the most transformative and complex projects and financings in both developed and emerging markets, including advising clients in joint venture arrangements, M&A, restructurings and public-private partnerships.


Real Estate:
S&C’s real estate group combines public/private market expertise and innovative deal-making skills to assist clients in purchasing, selling, developing and financing real estate companies and assets worldwide, and represents clients in restructuring real estate and other assets to facilitate generational transition and/or resolve disputes. 


Restructuring & Bankruptcy:
S&C is unique in its ability to handle all elements of a corporate restructuring—whether or not an insolvency proceeding is used as a tool.


Tax:
S&C’s tax group has a global reputation for innovative tax planning, the successful resolution of tax controversies and providing pivotal tax advice on corporate transactions.


Updated September 2024

Address:
125 Broad Street
New York, NY 10004
Tel:+1 212 558 4000 Fax:+1 212 558 3588 Web Address:http://www.sullcrom.com
2027 Edition
Bankruptcy
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Commercial
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Competition/antitrust
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International arbitration
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Labor and employment
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Securities
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White collar crime
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Linked Reviews
Dispute Resolution
Sullivan & Cromwell maintains a formidable national disputes practice, with litigators across New York, Washington, D.C. and California handling complex commercial, securities, appellate, intellectual property, antitrust and restructuring matters. The firm recorded a number of significant outcomes during the research period, including major appellate reversals, trial victories and dismissals, while its increasingly prominent bankruptcy practice continued to generate consequential disputes work.

New York’s Robert Giuffra Jr., co-chair of the firm, featured prominently in its appellate work. Giuffra argued on behalf of the Republic of Argentina before the Second Circuit, which in March 2026 vacated an $18 billion judgment arising from litigation over Argentina’s expropriation of shares in YPF. The ruling reversed the large judgment entered in the Southern District of New York. Amanda Flug Davidoff, managing partner of the D.C. office and deputy managing partner of the litigation group, was also part of the team. Davidoff additionally represents BP in climate-related litigation in which the Maryland Supreme Court affirmed the dismissal of tort claims brought by three Maryland municipalities.

Giuffra also argued FirstEnergy’s successful class-certification appeal before the Sixth Circuit. In August 2025, the court vacated certification of the proposed investor class, and in October 2025 the Sixth Circuit separately vacated an order concerning internal investigations, concluding that the investigations were protected by attorney-client privilege and the work-product doctrine. New York’s Sharon Nelles, managing partner of Sullivan & Cromwell’s litigation group, was among the partners representing FirstEnergy. Nelles also represented Citigroup and certain current and former executives in securities litigation in which the Southern District of New York denied the plaintiffs’ attempt to amend their complaint in November 2025, resulting in dismissal with prejudice of all claims.

Intellectual property was another notable source of activity. New York’s Dustin Guzior, co-head of the firm’s intellectual property and technology litigation group, led Sullivan & Cromwell’s work for Masimo Corporation in its patent infringement dispute against Apple. In November 2025, a jury returned a unanimous verdict finding infringement and awarding Masimo $634 million in royalties. Guzior has also acted for Lexeo Therapeutics in trade-secrets litigation that concluded with a settlement in June 2025.

The firm’s restructuring and bankruptcy capabilities remained prominent. New York’s James Bromley, co-head of the global restructuring practice, represented SVB Financial Group, which emerged from Chapter 11 in November 2024. In September 2025, the firm subsequently secured a complete victory for SVB Financial in an adversary proceeding brought by the joint official liquidators of Silicon Valley Bank’s Cayman Islands branch, with the bankruptcy court denying the liquidators standing to assert nearly $1 billion in claims.

On the West Coast, Andrei Iancu, co-head of the firm’s intellectual property and technology litigation group, represented Access Advance, Dolby Laboratories and Sun Patent Trust in patent infringement claims brought by Roku. Iancu helped secure dismissal of all 10 counts. Iancu also represents Arbutus Biopharma and Genevant Sciences in patent litigation against Moderna, which concluded with Moderna agreeing to pay $950 million to resolve the clients’ global patent litigation, with an additional $1.3 billion payment conditioned on the outcome of an appeal.

Together, these matters reflect the breadth of Sullivan & Cromwell’s national disputes platform is self-evident, spanning major trial and appellate litigation, securities disputes, intellectual property and restructuring matters across its New York, Washington, D.C. and California practices.




Updated October 2026
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