Durie Tangri LLP

What Durie Tangri LLP does

Durie Tangri LLP was a premier Bay Area intellectual property litigation boutique founded in 2010 by Daralyn Durie and Ragesh K. Tangri in San Francisco, California. The firm represented enterprise clients in technology and life sciences sectors across patent, trademark, and copyright disputes, complex civil litigation, class action defense, professional liability matters, privacy litigation, and white-collar crime defense. It built a reputation as a trial-focused boutique, securing three post-COVID jury trial defense verdicts in 2021 and 2022 for Activision Blizzard (Call of Duty Black Ops 4 copyright case), Redbubble (Atari copyright/trademark case), and Aptiv (USB technology patent case), and was lead defense counsel for OpenAI and Anthropic in generative AI copyright infringement suits.

The firm operated a partner-led, high-touch engagement model targeting sophisticated enterprise clients with high-stakes IP exposure, generating revenue primarily through legal service fees on contested matters. Pricing arrangements were not publicly disclosed but consistent with professional services fee models (hourly, alternative fee arrangements, or contingency structures depending on matter type). Distribution relied on professional reputation, alumni networks extending to Google, Meta, Amazon, and OpenAI, and direct attorney-client relationships rather than traditional product marketing channels.

On January 3, 2023, Durie Tangri completed a combination with Morrison Foerster LLP, transferring 50+ attorneys and its IP litigation bench into a global platform with 115+ patent attorneys and offices across the United States, United Kingdom, and beyond. Upon closing, the firm ceased independent operations and its co-founders joined Morrison Foerster as partners. The combination was positioned by Morrison Foerster as cementing its standing as a "premier global IP and patent powerhouse" at the forefront of technology and life sciences legal work.

Name

Durie Tangri LLP

Legal name

Durie Tangri LLP

Website

https://durietangri.com

Company type

Private

Founded year

2010

Operating status

Acquired

Headcount range

11–50 employees

Short description

Durie Tangri LLP was a Bay Area intellectual property litigation boutique founded in 2010 that represented technology and life sciences enterprises in patent, trademark, copyright, and complex civil matters, achieving notable jury trial defense verdicts before combining with Morrison Foerster on January 3, 2023.

Ownership category

akta.pro rank

Product category

Legal Services

NAICS

Legal Services (5411), Offices of Lawyers (541110)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Copyright Services & Content Protection (BPAHAMAC)

akta.pro secondary industry

Patent Prosecution & Portfolio Management (BPAHAMAA)

Keywords

• Intellectual property litigation
• Complex civil litigation
• Patent litigation services
• Trademark copyright litigation
• Commercial trial practice

Headquarters

HQ city

San Francisco

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations

Revenue model

1. Legal Services Fees: As a litigation boutique law firm, Durie Tangri generates revenue through client engagements for legal representation. Services include intellectual property litigation (patent, trademark, copyright), complex civil litigation, trial representation, professional liability defense, privacy matters, white-collar crime defense, and class action defense. The firm serves enterprise clients in technology, life sciences, and other sectors requiring sophisticated legal counsel for high-stakes disputes.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Durie Tangri LLP is a premier Bay Area litigation boutique law firm providing legal representation in intellectual property matters (patent, trademark, and copyright), complex civil litigation, and trial advocacy. The firm serves enterprise clients in technology and life sciences sectors, with additional capabilities in professional liability defense, privacy matters, white-collar crime and investigations, and class action defense.

Product overview

Durie Tangri LLP is a premier litigation boutique law firm offering a unified portfolio of legal services. The firm's core practice areas include intellectual property litigation (covering patent, trademark, and copyright matters), complex civil litigation, and trial practice. Supporting service modules encompass professional liability defense, privacy counseling and litigation, white-collar crime defense and investigations, and class action defense. The firm is known for its trial excellence, having secured multiple post-COVID jury trial victories for major technology and entertainment clients.

Differentiator

Problem solved

Functional benefit

Products and services

• Patent Litigation Services
• Trademark Litigation Services
• Copyright Litigation Services
• Complex Civil Litigation
• Trial Practice
• Professional Liability Defense
• Privacy Counseling and Litigation
• White-Collar Crime and Investigations
• Class Action Defense

Quantifiable outcome

• Defense verdict for Activision Blizzard in copyright case over Call of Duty Black Ops 4 videogame
• +3 more outcomes

Named customers5 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• Morrison Foerster LLPflagshipStrategic or Co-development Partner · 3 January 2023Morrison Foerster and Durie Tangri completed their combination on January 3, 2023. Durie Tangri's premier litigation boutique joined Morrison Foerster, strengthening the global firm's intellectual property, complex civil litigation, and trial capabilities. The combination positions Morrison Foerster as a premier global IP and patent powerhouse at the forefront of technology and life sciences legal work. Durie Tangri's co-founders Daralyn Durie and Ragesh K. Tangri joined as partners, along with over 50 attorneys.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• Latham & Watkins LLP: Latham runs a global IP litigation practice regularly engaged in high-stakes patent and copyright disputes, with comparable trial capability and a client roster overlapping with Durie Tangri's technology and life sciences focus.
• Wilson Sonsini Goodrich & Rosati: Wilson Sonsini is the dominant technology and life sciences firm serving Silicon Valley; its patent litigation practice competes with Durie Tangri for trial representation of major technology and biotech clients.
• Cooley LLP: Cooley is a leading technology and life sciences full-service firm with a sizable IP litigation group that represents many of the same growth-stage and public technology clients as Durie Tangri, including generative AI and semiconductor companies.
• Morrison Foerster LLP: Durie Tangri's parent post-combination; Morrison Foerster operates a premier global IP and patent practice with 115+ patent attorneys and 300+ patent disputes litigated in the past five years, directly absorbing and amplifying Durie Tangri's capabilities.

Direct peers

• Irell & Manella LLP: Irell & Manella is a premier California-based IP and complex litigation boutique known for patent trial work for major technology and life sciences clients, providing a near-direct comparison to Durie Tangri's practice focus.
• WilmerHale: WilmerHale runs a leading patent litigation practice within a broader full-service firm, regularly trying high-stakes IP cases for technology and life sciences clients and competing head-to-head with Durie Tangri for trial mandates.
• Finnegan Henderson Farabow Garrett & Dunner LLP: Finnegan is a leading IP specialty firm handling patent, trademark, copyright, and trade secret litigation across the most active district courts, serving many of the same technology and life sciences clients as Durie Tangri.
• Quinn Emanuel Urquhart & Sullivan: Quinn Emanuel is a globally recognized litigation-only boutique famed for high-stakes IP, antitrust, and complex commercial disputes; its trial-only model and tech-sector client roster closely mirror Durie Tangri's approach and positioning.
• Fish & Richardson PC: Fish & Richardson is one of the largest pure-play IP law firms in the United States, handling patent, trademark, and copyright litigation; its scale and IP trial depth make it a direct strategic peer for complex IP mandates.
• Susman Godfrey L.L.P. Susman Godfrey is a leading US trial boutique with a strong IP and complex commercial litigation practice; its plaintiff-side orientation and trial reputation make it a comparable boutique IP litigation adversary to Durie Tangri.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/durie-tangri-llp

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Durie Tangri LLP