Arnold & Porter

Arnold & Porter is a firm of nearly 1,000 lawyers, providing sophisticated litigation and transactional capabilities, renowned regulatory experience and market-leading multidisciplinary practices in the life sciences and financial services industries. Client-driven and industry focused, our lawyers practice across more than 30 practice areas, including bankruptcy, corporate finance, intellectual property, litigation, real estate and tax, to help clients with complex needs stay ahead of the global market, anticipate opportunities and address issues that impact the very value of their businesses. Our global reach, experience and deep knowledge allow us to work across geographic, cultural, technological and ideological borders, to offer clients forward-looking, results-oriented solutions that resolve their US, international and cross-border legal needs.

Who We Are

  • 100 Years of business acumen with a practical forward-looking, results-driven approach
  • 14 Offices in the US, Europe and Asia
  • 123 Attorneys ranked in Chambers USA, UK, Global, Europe, Latin America, and Asia-Pacific
  • 94 Attorneys who have held senior positions in US and European governments and international organizations
  • 133 Fortune 250 companies have chosen Arnold & Porter as outside counsel

What We Offer

  • Nearly 1,000 lawyers with an unyielding commitment to excellence and professionalism
  • Exceptional depth of talent across the litigation, regulatory, and transactional spectrum
  • Leading multidisciplinary practices in the life sciences and financial services industries
  • Among the broadest and deepest service offerings in the two key US legal markets of New York and Washington, DC
  • Broad reach across geographic, cultural, commercial, and ideological borders
  • One of the world's leading pro bono programs, with our attorneys performing more than 96,714 hours of pro bono work in 2018

Rankings – Recognition Across a Broad Spectrum

  • The National Law Journal's Appellate Hot List (2010, 2013-2018)
  • The American Lawyer's "A-List" recognized the firm eight times since 2003
  • Chambers USA 2019 ranked 95 attorneys as "Leading Individuals"
  • Chambers UK 2019 ranked 15 attorneys as "Leading Individuals"
  • Chambers Global 2019 ranked 29 attorneys
  • JUVE 2016-2019 ranked 6 attorneys in Germany
  • Chambers Latin America 2019 named the firm a leading law firm
  • Chambers Asia-Pacific 2019 ranked 4 attorneys
  • Global Competition Review ranked the firm on its 2017 "GCR Global Elite" list
  • FORTUNE Magazine's "100 Best Companies to Work For" (2003-2010, 2013-2016)
  • VAULT Guide's "Top 100 Law Firms" (2004-2019)
  • Legal 500 US, UK, Europe, Latin America, and Asia ranked 64 practices and recognized 182 attorneys
  • U.S. News Best Law Firms -- 45 national rankings and 103 metropolitan rankings in Chicago, Denver, Houston, Los Angeles, New York, San Francisco, San Jose (Silicon Valley), and Washington, DC

Diversity – A Core Value at Arnold & Porter

  • "Corporate Equality Index" ranking by the Human Rights Campaign (2006, 2008-2019)
  • Minority Corporate Counsel Association's "Thomas L. Sager Award" (1999-2000, 2002-2005, 2008, 2015)
  • Yale Law Women's "Top 10 Family Friendly Law Firms" (2006-2018) and "Top 10 Female Friendly Firms" (2018)
  • Working Mother Magazine's "100 Best Companies" (1996-1997, 2001-2002, 2004-2018) and "Best Law Firms for Women" (2015-2018)
  • The National Law Journal named an Arnold & Porter attorney to its "Minority 40 Under 40" list in 2011, 2014, and 2015

Pro Bono – One of the World's Leading Law Firm Programs

  • National Law Journal 2018 Pro Bono Hot List
  • The American Lawyer's 2018 Pro Bono Report ranked the firm No. 8 internationally and No. 18 in the US
  • Law360's "Pro Bono Firms of 2016"
  • New York Immigration Coalition's 2017 Outstanding Service Award
  • Protect Our Defenders 2017 Justice Award
  • Washington Lawyer's Committee's 2017 Outstanding Achievement Award
  • Handled numerous death penalty cases, most recently obtaining the release of a client who had been on death row for 17 years for a murder he did not commit
  • In the largest pro bono case in our history (more than 150 timekeepers and 31,000 hours), reached a landmark settlement with Federal Bureau of Prisons requiring appropriate medical treatment for mentally ill prisoners at the famous "Supermax" prison in Colorado
  • Represented dozens of transgender clients on a variety of issues
  • Brought litigation that forced a New Jersey township to allow construction of a mosque it had blocked in response to post 9/11 concerns
  • Kids in Need of Defense (KIND) 2016 Vision Award
  • Brought successful challenge to Pennsylvania's voter ID statute

Arnold & Porter: Our Firm


We provide the full breadth of legal resources to represent all of our clients' interests. Through interdisciplinary collaboration and specialized experience in our clients' industries, we offer truly innovative and effective solutions that align with both clients' short- and long-term business objectives.

For those clients who cannot afford legal counsel, we maintain a broad and meaningful pro bono practice. Arnold & Porter is one of a small number of firms whose attorneys consistently average more than 100 hours per year of pro bono work. With a lengthy record of excellence, we remain committed to the community at large. In all of our work, we stay true to our core values. We maintain a diverse workplace, a collegial work environment, and an unyielding commitment to inclusiveness.


We set our standards high, expect the best from our attorneys, and return top-tier work on behalf of our clients. Our tradition of excellence is distinguished, and our attorneys are widely respected in the US and abroad. Our attorneys are leaders in their fields, speak frequently throughout the world on the firm's core practice areas, and are published widely in legal journals, industry and mass media, and "hot topic" books.

Our attorneys’ accomplishments are grounded in their training—often at the most noted legal institutions around the globe—and further enhanced by the experiences many of them had as doctors, biologists, chemists, public policy professionals, and former high-ranking officials from key US regulatory agencies and the executive and legislative branches of the federal government. Their insider perspectives are integral to understanding the legal and policy frameworks in which complex business and legal issues arise, and how best to structure transactions and overcome litigation and regulatory challenges.

Recent Firm News & Legal Updates

Legal Update
The Committee on Foreign Investment in the United States (CFIUS) issued its first-ever Enforcement and Penalty Guidelines for entities that violate mitigation agreements with CFIUS or otherwise run afoul of Section 721 of the Defense Production Act of 1950 and the regulations promulgated thereunder.
Legal Update

On September 30, 2022, the Office of Foreign Assets Control (OFAC) of the US Department of the Treasury published its "Sanctions Compliance Guidance for Instant Payment Systems" designed to help financial institutions allocate their compliance resources consistent with their sanctions risks.

Legal Update

The Biden Administration has prioritized addressing the environmental and health issues posed by the use of perfluoroalkyl or polyfluoroalkyl substances (PFAS), including use by federal agencies and the military.

Firm Offices in Member Jurisdiction

U.S.A. - Washington, DC


Firm Offices in Other Jurisdictions

North America

United States 
U.S.A. - California,
Los Angeles Palo Alto San Francisco
U.S.A. - Colorado, Denver
U.S.A. - Illinois, Chicago
U.S.A. - New Jersey, Newark
U.S.A. - New York, New York
U.S.A. - Texas, Houston


Belgium, Brussels
England, London


China, Shanghai
South Korea, Seoul

* Indicates affiliated firm

All Firm Contacts Committees
Marketing & Business Development Professionals Forum
Marketing & Business Development Professionals Forum
Women of WLG (WOW)
Women of WLG (WOW)
Practice Groups
Banking & Finance
Banking & Finance
International Corporate Transactions
International Corporate Transactions
Compliance & Investigations
Compliance & Investigations
Dispute Resolution
Dispute Resolution
Antitrust, Competition & Foreign Direct Investment
Antitrust, Competition & Foreign Direct Investment
Other Firm Members