United States

Editor’s notes

Welcome to The Legal 500 United States.

Current rankings and information online are taken from The Legal 500 United States 2025 edition, which was published on 11 June 2025. Please use the menu to navigate through the practice areas.

The US edition of The Legal 500 is now in its 18th year and, like the other established editions of the guide, is relied upon by millions of buyers of legal services worldwide when they need to instruct outside counsel.

What’s new in the 2025 edition?

In the latest 2025 edition of the Legal 500 United States, we are delighted to have continued the expansion of our coverage of the US legal market, highlighting new trends and developments across the jurisdiction’s top firms.

We are pleased to recognize a total of 343 firms in this year’s edition, including members of the Amlaw 100 – showcasing our commitment to recognizing firms handling high-level, nationally significant work across practice areas.

Individual recognitions have shot up in the new rankings, including a grand total of 2001 attorneys ranked as Leading Partners, an increase of 14%. We are also delighted to rank 257 Leading Associates, and 777 Next Generation Partners.

The basis for inclusion

Our team of experienced researchers – which includes both qualified journalists and lawyers – spend several months each year conducting in-depth research into the market. The primary source of our information is the law firms themselves, and the information they provide is often not for public consumption. This allows us to properly assess them against one another, practice area by practice area. We also gather feedback from peers and clients to assess their overall visibility and reputation. The process culminates in detailed rankings and editorial, providing buyers of legal services with an objective analysis of the US market that is updated annually.

Approach

We organise each practice area into a single national ranking, eschewing a state-by-state approach. We look at firms with the capability and reach to handle sophisticated and complex work. This is not a game of numbers – indeed many of the firms included are small, single-office firms – but simply a question of quality.

Emphasis on teams, not individuals

With the notable exception of our leading trial lawyers list, we do not rank individual lawyers by tier. We do highlight certain key individuals within the editorial paragraphs and in our individual rankings, but our principal aim is to provide a snapshot of the market based on our assessment of the overall strength and depth of a practice group.

As your US editor, I would welcome your feedback and ideas about how we can further develop the rankings and evolve the guide to ensure it appropriately reflects this largest legal market in the world. Please do get in touch.

Barnaby Merrill

Editor, The Legal 500 United States

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Press Releases

Former HHS-OIG Assistant Inspector General for Legal Affairs Lisa Re Joins Arnold & Porter

WASHINGTON, D.C., September 2, 2025 — Arnold & Porter announced today that Lisa Re has joined the firm’s Life Sciences & Healthcare Regulatory practice as a partner, resident in Washington, D.C. Mahnu Davar and Allison Shuren, co-chairs of Arnold & Porter’s Life Sciences & Healthcare Regulatory practice, said: “Lisa’s broad experience garnered over two decades in significant leadership positions within HHS Office of Inspector General will complement and expand the strategic counseling and government investigation work of our existing healthcare and life sciences regulatory and enforcement teams. Her first-hand knowledge of healthcare fraud enforcement, OIG compliance program expectations, and processes governing OIG administrative interactions and advisory opinion requests will be invaluable to life sciences and healthcare clients.” As the former Assistant Inspector General for Legal Affairs and Acting Chief Counsel, Re was HHS’s representative for False Claims Act cases and spent years coordinating with the U.S. Department of Justice on these matters. She led OIG’s administrative litigation and exclusion program, established enforcement priorities, and oversaw OIG’s self-disclosure protocol. Re has deep experience advising on complex issues and laws such as the Anti-Kickback Statute, Civil Monetary Penalties Law, Emergency Medical Treatment and Labor Act (EMTALA), Information Blocking, and the Exclusions Statute. She was responsible for OIG’s compliance policy and Corporate Integrity Agreement enforcement, helping to strengthen the agency’s oversight of the pharmaceutical, biotech, and medical technology industries. In joining the firm, Re said: “Throughout my time at OIG, I became familiar with Arnold & Porter’s reputation of excellence both in healthcare regulation and across the life sciences industry. I’m eager to begin collaborating with my new colleagues and leverage my government experience to help deliver integrated, strategic advice on oversight and enforcement to the firm’s healthcare, life sciences, and technology clients.” Re earned her J.D. from St. Louis University School of Law, her M.A. from Webster University, and her B.S. in Nursing from St. Louis University.   About Arnold & Porter Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues. With over 1,000 lawyers practicing in 16 offices worldwide, we offer deep industry experience and an integrated approach that spans more than 40 practice areas. Through multidisciplinary collaboration and focused industry experience, we provide innovative and effective solutions to mitigate risks, address challenges, and achieve successful outcomes.
Arnold & Porter - September 2 2025
Press Releases

Arnold & Porter Expands Corporate & Finance Practice with Addition of Fund Formation Lawyer Michael Saarinen

NEW YORK, NY, August 28, 2025 — Arnold & Porter announced today that Michael Saarinen has joined the firm’s Corporate & Finance practice as a partner co-lead of the Investment Management practice group, resident in New York. Ron Levine and Derek Stoldt, co-chairs of Arnold & Porter’s Corporate & Finance practice, added: “Mike’s arrival further strengthens our investment management capabilities, a vital part of the firm’s transactional platform. As private capital raising continues to be a dominant force in global markets, our clients require sophisticated legal counsel across fund formation, regulatory compliance, and ongoing investment activity. Mike’s experience in these areas deepens our ability to deliver seamless support tailored to our clients’ needs.” Mike has over two decades of experience advising U.S. and global fund sponsors on the formation and operation of private investment funds across a range of asset classes and strategies, including buyout, venture capital, real estate, credit, hedge fund, and fund-of-funds. His practice involves advising on separately managed accounts, co-investment vehicles, and other investment structures. His work also includes guidance on regulatory matters, investment management transactions, and internal governance issues such as compensation and succession planning. He has experience working with the full spectrum of private fund investors, including family offices, endowments, and insurance companies. In joining the firm, Mike said: “Arnold & Porter’s integrated Corporate & Finance practice offers clients a seamless platform that combines fund formation, investment management, and sophisticated transactional capabilities. I was excited to join a team so well-positioned to help clients achieve their goals in today’s complex and competitive markets.” Mike earned his J.D. from Harvard Law School, cum laude, and his B.A. from Columbia University, magna cum laude.   About Arnold & Porter Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues. With over 1,000 lawyers practicing in 16 offices worldwide, we offer deep industry experience and an integrated approach that spans more than 40 practice areas. Through multidisciplinary collaboration and focused industry experience, we provide innovative and effective solutions to mitigate risks, address challenges, and achieve successful outcomes.
Arnold & Porter - September 1 2025
Press Releases

Boies Schiller Flexner and Gelmetti advising on the acquisition of Italcol by The Tampieri Group

Milano, 15th April 2025 - Boies Schiller Flexner, with a team led by Partner Luigi M. Macioce (pictured on the right) and composed of Counsel Valentina Susanna Gava and Associate Matteo Freschi, advised Tampieri Financial Group S.p.A.—the holding company of the eponymous Group, active in the agri-food sector with a strong focus on bulk oils and animal feed flours—in the acquisition of 100% of the share capital of Italcol S.p.A. Italcol is a Tuscan-based company engaged in the production of crude oils obtained from the pressing of sunflower seeds, grape seeds, virgin olive pomace, and rapeseed, as well as the production of animal feed flours, biomass fuels, and essential oils. Tampieri Group is a market leader in the sector in which Italcol operates. Through this acquisition, Tampieri strengthens its market position by integrating a company renowned for the high quality of its raw materials and supply chain, as well as its ability to deliver customized solutions tailored to client needs. The Boies Schiller Flexner team supported the Tampieri Group across all legal aspects of the acquisition, from legal due diligence through to the negotiation and execution of the closing documents for the transaction. BE Partner acted as the buyer’s financial advisor, with a team led by Partner Simone Nanni. The sellers were advised on all legal matters by Gelmetti Studio Legale Associato, with a team led by Partner Pierfrancesco Gelmetti (pictured on the left) and composed of Senior Associate Lorenzo Colletti and Associate Carlo Bertazzi. The sellers' financial advisor was Xpertia STP, with Partner Simone Bonacchi.   FOR MORE INFORMATION Paolo Bossi, Of Counsel PBV & Partners Srl Piazza della Repubblica, 10 20121 Milano [email protected] Mob +39 3498648788    
Boies Schiller Flexner LLP - May 17 2025
Press Releases

Burden Walker, Former Deputy Assistant Attorney General of DOJ’s Consumer Protection Branch, Joins Arnold & Porter

WASHINGTON, D.C., March 3, 2025 — Arnold & Porter is pleased to announce that Burden Walker, former Deputy Assistant Attorney General of the Consumer Protection Branch of the U.S. Department of Justice (DOJ), Senior Counselor to the Attorney General, and Deputy Associate Attorney General, will join the firm as a partner in the Complex Litigation practice. Walker will be resident in the Washington, D.C. office. In welcoming Walker, Ken Chernof, co-chair of the firm's Litigation group, said: “Burden is an extraordinarily versatile, widely respected litigator whose breadth of experience at the DOJ will enhance our firm’s litigation capabilities. He is well-positioned to advise clients across a broad spectrum of disputes, particularly government-facing litigation, investigations, and administrative litigation, drawing on his experience in senior government positions.” In his role as Deputy Assistant Attorney General of DOJ’s Consumer Protection Branch, Walker supervised the enforcement of the nation’s consumer welfare laws, including the Federal Trade Commission Act’s protections against unfair, deceptive, or abusive practices and the Food, Drug and Cosmetics Act’s protections against misbranded or adulterated food and drugs. During his tenure at the DOJ, Walker also served as Senior Counselor to the Attorney General, Deputy Associate Attorney General responsible for the Civil, Antitrust, and Environment and Natural Resources Divisions, and Assistant U.S. Attorney for the District of Maryland. Walker has investigated, prosecuted, and tried white collar crime cases and supervised other prosecutors in their appeals before the U.S. Court of Appeals for the Fourth Circuit. In joining the firm, Walker said: “Arnold & Porter has an impressive roster of talented former government officials and seasoned litigators. I am excited to draw on my experiences handling high-stakes cases at the DOJ and collaborate with my colleagues to represent the interests of the firm’s clients.” Walker earned his J.D. from Harvard Law School and his A.B. from Harvard College. He served as a law clerk to Justice Ruth Bader Ginsburg of the U.S. Supreme Court and the Honorable Stephen F. Williams of the U.S. Court of Appeals for the D.C. Circuit. About Arnold & Porter Arnold & Porter combines sophisticated regulatory, litigation, and transactional capabilities to resolve clients’ most complex issues. With over 1,000 lawyers practicing in 15 offices worldwide, we offer deep industry experience and an integrated approach that spans more than 40 practice areas. Through multidisciplinary collaboration and focused industry experience, we provide innovative and effective solutions to mitigate risks, address challenges, and achieve successful outcomes.
Arnold & Porter - March 11 2025