Sheppard Mullin

Sheppard Mullin (formally Sheppard, Mullin, Richter & Hampton LLP) is a major American full-service law firm headquartered in Los Angeles, California. It was founded in 1927 and has grown into one of the largest law firms in the United States, with a broad national platform and a growing international footprint. The firm operates as a limited liability partnership, which means it is privately held by its partners rather than traded on any stock exchange. The firm's practice spans the core areas expected of a large corporate law firm: complex business litigation, corporate and securities work, mergers and acquisitions, intellectual property, labor and employment, real estate, government contracts, antitrust, and white-collar defense. Sheppard Mullin is particularly noted for its entertainment and media practice, reflecting its Los Angeles roots, as well as for its strong litigation and intellectual property capabilities. It also maintains notable practices serving technology, life sciences, financial services, and hospitality clients. Sheppard Mullin has expanded well beyond its California base, opening offices across the United States and internationally, including in Asia and Europe. Its international offices support cross-border corporate, intellectual property, and dispute-resolution work for clients doing business in the United States and abroad. The firm is regularly ranked among the largest law firms in the United States by headcount and revenue. As a partnership, Sheppard Mullin is led by a managing partner and an executive committee drawn from its partner ranks. The firm competes in the premium legal services market against other large national and international law firms, positioning itself as a full-service advisor capable of handling bet-the-company litigation and complex transactions. Its brand is built on partner-driven client service, deep industry knowledge, and a broad geographic platform.

Sheppard Mullin was founded in 1927 in Los Angeles, California, and has grown over nearly a century into one of the largest law firms in the United States. From its origins as a Los Angeles litigation and business firm, it expanded its practice areas and geographic reach to serve a national and increasingly international client base. Through the late twentieth and early twenty-first centuries, the firm broadened beyond its California roots, opening offices across the United States and later internationally, including in Asia and Europe. This expansion supported its corporate, intellectual property, and cross-border dispute-resolution work. The firm's Los Angeles heritage gave it a strong entertainment and media practice, which it complemented with substantial litigation, intellectual property, labor and employment, real estate, and government contracts capabilities. Sheppard Mullin operates as a limited liability partnership owned by its partners. It is regularly ranked among the largest U.S. law firms by lawyer headcount and revenue, and it competes in the premium legal services market against other major national and international firms. Its brand rests on partner-driven service, industry depth, and a broad multi-office platform.

• 1927

  Sheppard Mullin founded in Los Angeles, California.

• Expanded from California base to offices across the United States.

• Opened international offices in Asia and Europe.

Full-service premium law firm competing among the largest U.S. national firms, with particular strength in litigation, IP and entertainment from its Los Angeles base.

• Complex business litigation

• Corporate and securities

• Mergers and acquisitions

• Intellectual property

• Labor and employment

• Real estate

• Government contracts

• Entertainment and media

• 2026

  Sheppard Mullin Discloses August Cyberattack and Personal Data Exposure to California Attorney General

  Sheppard Mullin disclosed an incident to the California attorney general's office on October 2, 2026, revealing that an attorney at the firm had fallen victim to a social engineering attack and had provided documents to an unknown third party in an August cyberattack. A former paralegal's subsequent lawsuit said the breach exposed names, Social Security numbers, and driver's license and government ID numbers, and affected at least 1,000 people.

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• 2026-10-02

  Sheppard Mullin discloses August cyberattack and personal data exposure to California attorney general[2]Sheppard Mullin Discloses August Cyberattack and Personal Data Exposure to California Attorney Generalabajournal.com

  Reported: 2026-10-09

  Sheppard Mullin disclosed an incident to the California attorney general's office on Oct. 2, 2026, revealing that an attorney at the firm had fallen prey to a social engineering attack and had given documents to an unknown third party in an August cyberattack; a former paralegal's subsequent lawsuit said the breach exposed names, Social Security numbers, and driver's license and government ID numbers and affected at least 1,000 people.

1. 1Sheppard Mullin official websitesheppardmullin.com
2. 2Sheppard Mullin Discloses August Cyberattack and Personal Data Exposure to California Attorney Generalabajournal.com