William K. Pao


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William K. Pao is a seasoned commercial litigator whose diverse practice focuses on three main areas: securities litigation, financial services and Fintech litigation, and complex commercial litigation. Will’s clients include companies across a wide spectrum of industries, including banking, technology, automotive, agriculture, education, and fashion. Co-Chair of O’Melveny’s Fintech Group, Will works extensively with emerging Fintech companies, including advising cryptocurrency and block chain companies on securities and regulatory as well as litigation issues. In addition, Will has substantial experience advising and representing Chinese companies and US companies that operate in China. Will speaks Mandarin, and has spent considerable time in China, Hong Kong, and Taiwan.

Will believes that to provide sound legal advice, it is imperative to understand a client’s business, inside and out. Understanding their business models, industries, customers, and strategic goals allows him to counsel and guide his clients through highly complex and sensitive matters.

Will has been recognized by the Los Angeles Business Journal as one of the “Most Influential Minority Attorneys” in Los Angeles. In addition, Benchmark Litigation named him to its “40 & Under Hot List” and recognized him as a litigation star for his work in securities, financial services, and commercial litigation.



  • Mandarin Chinese

Honors & Awards

  • Named "Local Litigation Star" for Financial Services, General Commercial, and Securities by Benchmark Litigation (2020)
  • Recommended by The Legal 500 US for General Commercial Disputes and Securities Litigation: Defense (2020)
  • Named to the 40 & Under Hot List for Financial Services, General Commercial, and Securities by Benchmark Litigation (2018-2019)
  • US Supreme Court victory in Resh v. China Agritech, Inc. named a National Impact Case by Benchmark Litigation California (2019)
  • Recognized by the Los Angeles Business Journal as one of the “Most Influential Minority Attorneys” in Los Angeles (2018)
  • Recognized as a Southern California “Rising Star” by Super Lawyers as published in Los Angeles magazine (2014-2019)


Bar Admissions

  • California

Court Admissions

  • US Supreme Court
  • US District Court, District of Colorado
  • US District Court, Central, Eastern, Northern, and Southern Districts of California
  • US Court of Appeals, Fifth, Seventh, and Ninth Circuits


  • University of California at Berkeley, J.D.: Order of the Coif; Executive Editor, Berkeley Business Law Journal; Member, Moot Court Board
  • Fudan University, Fulbright Scholar
  • University of Southern California, B.A., Political Science, Economics, East Asian Languages and Cultures (triple major): summa cum laude; Departmental Honors (Political Science); Phi Beta Kappa

Professional Activities


  • Honorable Fortunato Benavides, US Court of Appeals, Fifth Circuit
  • Honorable David F. Levi, US District Court, Eastern District of California 

Fulbright Scholar

  • China 


  • “Doing Business in the US: Issues Facing Foreign Businesses,” PRC Consulate, Los Angeles (April 2, 2019)
  • “Current Issues in US-China Cross Border Litigation,” Tsinghua University School of Law (March 2012)
  • “Developing a China Practice 101,” Southern California Chinese Lawyers Association (January 2012)
  • “How to Do Business with China: What You Need to Know About Dispute Resolution, Deals, Anti-Bribery, and Other Legal Issues,” Los Angeles Chinese Chamber of Commerce (October 2012)
  • “How to Serve Clients in China with Your U.S. Litigation Practice,” Webinar for the American Bar Association (May 2012)
  • “Careers in International Law,” State Bar of California (March 2012)
  • “Developing an International Practice: Asia 101,” Webinar for State Bar of California (November 2011)
  • “Securities Litigation Goes Global: Unique Issues Posed by Securities Litigation and Enforcement in a Globalized Economy,” State Bar of California (June 2011)


  • “Resurrecting Time-Barred Crypto Claims Is An Uphill Struggle,” Law360 (May 6, 2020)
  • “Five Crypto-Securities Trends that Spell More Lawsuits in 2018,” Journal of Investment Compliance, Vol. 19 Issue: 2, pp. 13-15 (2018)
  • “Assembling the Pieces of the Scienter Puzzle: A New Approach to a Holistic Review of Scienter Pleading under Tellabs and the PSLRA,” Michigan State Journal of Business & Securities Law (April 9, 2014)
  • “Comcast Puts Securities Plaintiffs To An Earlier Test,” Law360 (January 27, 2014)
  • “'Holistic Review in Federal Securities Litigation,” Corporate Counsel (October 17, 2013)
  • “Am I on Speaker? Privacy in the Age of Smartphones,” Los Angeles Daily Journal (December 16, 2011)
  • “Courts Restrict Defendants’ Ability to Take Offensive,” The Recorder (July 25, 2011)
  • “The Facebook Effect on Litigation and Civil Discovery,” Los Angeles Daily Journal (June 28, 2011)
  • “Navigating the Thicket of California Law on Class Action Waivers,” Los Angeles Daily Journal (February 7, 2011)
  • “Interlocutory Appellate Review of Class-Certification Rulings under Rule 23(f): Do Articulated Standards Matter?” DRI’s Certworthy Newsletter (Winter 2009)
  • Representing one of the nation’s largest banks in numerous high-stakes consumer banking putative class actions.
  • Representing a cryptocurrency mining machines manufacturer in a Section 11 federal securities class action.
  • Representing a cryptocurrency mining machines manufacturer in a putative unfair competition class action.
  • Representing an online game developer in a putative securities class action involving a going-private transaction.
  • Represented an online service provider in one of the first shareholder class actions seeking to exploit China's ban on initial coin offerings. Manhattan federal Judge Paul A. Crotty dismissed with prejudice a Section 10(b) claim against the company and its CEO.