Sidley Austin

Sidley Austin
Name	Sidley Austin LLP
Founded	1866
Headquarters	Chicago, Illinois
Offices	Multiple global offices
Num attorneys	Thousands
Practice areas	Litigation; Transactions; Regulatory; Finance
Company type	Limited liability partnership

Sidley Austin is a multinational law firm founded in Chicago with a long history of corporate, litigation, and transactional practice. The firm serves clients across finance, healthcare, energy, technology, and government sectors and operates a global platform connecting North America, Europe, Asia, and Australia. Sidley Austin is known for high‑profile regulatory work, complex securities matters, and major mergers and acquisitions, and it competes with other prominent firms in the AmLaw 100 and international markets.

History

Sidley Austin traces roots to the post‑Civil War era in Chicago, emerging into prominence during the Gilded Age and Progressive Era through relationships with banks, railroads, and industrialists. Over the 20th century it expanded alongside milestones such as the rise of the Securities and Exchange Commission, the New Deal regulatory framework, and postwar corporate consolidation, aligning with clients in finance and manufacturing. The firm grew transnationally in the late 20th and early 21st centuries, opening offices in London, Brussels, Hong Kong, and Beijing, and adapting to M&A waves, the deregulation era of the 1980s, and the global financial crisis. Sidley Austin has produced alumni who served in the judiciary, executive branch, and regulatory agencies, contributing to the legal landscape alongside peers at firms like Sullivan & Cromwell, Cravath, Skadden, and Cleary Gottlieb.

Practice areas and services

Sidley Austin offers litigation and disputes, transactional counsel, regulatory and compliance advice, banking and finance, capital markets, mergers and acquisitions, antitrust, intellectual property, tax, real estate, and employment counseling. The firm advises on cross‑border financings, sovereign debt restructurings, derivatives and structured products, initial public offerings, private equity buyouts, and multijurisdictional investigations by agencies such as the Securities and Exchange Commission, the Department of Justice, the European Commission, and the Financial Conduct Authority. Sidley operates industry teams serving banking, insurance, asset management, healthcare providers, pharmaceutical companies, energy producers, technology platforms, and telecommunications carriers, often coordinating with outside counsel at firms like Latham & Watkins, Mayer Brown, DLA Piper, and Hogan Lovells on global matters.

Corporate structure and offices

Organized as a limited liability partnership, Sidley Austin maintains a partner‑managed governance model with executive committees and practice group leadership. The firm’s headquarters remain in Chicago, with major offices in New York, Washington, D.C., Los Angeles, London, Brussels, Hong Kong, Singapore, Beijing, and Sydney, enabling coordination of cross‑border deals and disputes involving institutions such as the International Monetary Fund, World Bank, European Central Bank, and Asian Development Bank. Sidley’s global platform integrates practice groups across time zones to serve multinational corporations, investment banks, private equity sponsors, sovereign clients, and nonprofit institutions, maintaining alliances and recruiting from leading law schools including Harvard, Yale, Columbia, Stanford, University of Chicago, and NYU.

Notable cases and clients

Sidley Austin has represented major financial institutions, corporations, and public entities in precedent‑setting matters. The firm has advised on large bank mergers, cross‑border M&A transactions, and transformative IPOs for companies listed on the New York Stock Exchange and NASDAQ, working with issuers, underwriters, and regulatory bodies. Sidley has defended clients in securities class actions, antitrust litigation, and white‑collar criminal investigations involving enforcement by the Department of Justice, the Securities and Exchange Commission, the Commodity Futures Trading Commission, and state attorneys general. The firm’s litigation practice has handled complex commercial disputes before federal and state courts and arbitral tribunals such as the International Chamber of Commerce and ICSID. Clients have included major banks, insurance groups, multinational energy companies, global pharmaceutical firms, technology enterprises, and sovereign wealth funds.

Rankings, awards, and financials

Sidley Austin appears regularly in rankings published by The American Lawyer, Chambers and Partners, Legal 500, and Vault, and it is a consistent member of the AmLaw 100 by gross revenue. The firm has received recognition for practices in securities, banking, capital markets, white‑collar defense, and pro bono work, and individual lawyers have been honored by organizations such as the National Law Journal and Euromoney. Financially, Sidley reports multibillion‑dollar gross revenues and revenue per lawyer figures that place it among the leading global firms, competing with constituents of the Global 100 and the U.S. AmLaw top tier.

Pro bono work and diversity initiatives

Sidley Austin maintains organized pro bono programs supporting civil rights litigation, asylum and immigration matters, veterans’ legal services, and nonprofit counseling, coordinating with organizations such as the ACLU, Human Rights Watch, Legal Aid societies, and public interest law centers. The firm publishes diversity and inclusion reports, operates affinity groups, and has instituted recruiting and retention initiatives aimed at increasing representation of women and lawyers of color, collaborating with bar associations including the National Bar Association, Hispanic National Bar Association, Asian American Bar Association, and LGBTQ+ legal organizations. Sidley also engages in pipeline programs with universities and advocacy groups to support access to the profession and has been acknowledged in diversity rankings by organizations like the Diversity Lab and Seramount.

Category:Law firms