O’Melveny Worldwide

Stephen McIntyre is a versatile antitrust lawyer who represents clients in civil and criminal investigations, government enforcement actions, and high-stakes private litigation. Stephen brings skill, insight, and practicality to each matter—be it a nationwide class action, a suit against a client’s chief competitor, or an inquiry from a federal or state antitrust enforcer.

Stephen has won victories for clients in the pharmaceutical, technology, and entertainment industries, among others. His recent successes include successfully arguing for the dismissal of claims against owners and managers of student-housing properties in In re RealPage, Inc. Rental Software Antitrust Litigation; a Ninth Circuit victory affirming the dismissal of antitrust conspiracy claims against Samsung Electronics and other semiconductor manufacturers in In re Dynamic Random Access Memory (DRAM) Antitrust Litigation; and a sweeping summary judgment win on behalf of ExxonMobil in an antitrust conspiracy case in which plaintiffs sought tens of billions of dollars in damages.

Lauded as an “Up and Coming” leader (Chambers USA, Antitrust: California, 2023), a “Rising Star” (Law360, 2022), and a “Top Antitrust Lawyer” in California (The Daily Journal, 2021), Stephen is widely respected among peers, clients, and adversaries alike. He is also an active contributor to the antitrust community. Stephen has served on the Executive Committee of the California Lawyers Association’s Antitrust & Unfair Competition Law Section and on the Executive Committee of the LA County Bar Association’s Antitrust & Unfair Business Practices Section. From 2021 to 2022, Stephen served as Editor-in-Chief of the scholarly journal Competition.

Fluent in Mandarin Chinese, Stephen maintains an active pro bono practice representing refugees and asylum seekers.

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  • Successfully argued that antitrust conspiracy claims asserted against companies that managed student-housing rental properties—including O’Melveny clients BH Management Services, B.HOM Student Living, and Timberline Real Estate Ventures—should be dismissed. After holding a multi-hour hearing, the court granted the student-housing defendants’ joint motion to dismiss, with prejudice, on the strength of Stephen’s oral argument. See In re RealPage, Inc. Rental Software Antitrust Litig. (No. II), No. 3:23-md-3071, 2023 WL 9004806 (M.D. Tenn. Dec. 28, 2023).
  • Represented Samsung Electronics Co. Ltd. in In re Dynamic Random Access Memory (DRAM) Indirect Purchaser Antitrust Litigation and In re Dynamic Random Access Memory (DRAM) Direct Purchaser Antitrust Litigation, putative class actions in which the plaintiffs alleged a conspiracy to restrict the global supply of DRAM products. Stephen and his team repeatedly prevailed over two sets of class-action plaintiffs, securing multiple dismissals of their successive complaints. In 2022, the Ninth Circuit unanimously affirmed these victories. See In re Dynamic Random Access Memory (DRAM) Indirect Purchaser Antitrust Litig., 28 F.4th 42 (9th Cir. 2022).
  • Represented Samsung Bioepis in In re Humira (Adalimumab) Antitrust Litigation, the first “reverse- payment” litigation involving biologics and biosimilars. Stephen played a leading role in developing the defendants’ dismissal arguments. In June 2020, the district court granted defendants’ motion to dismiss in full, and in August 2022, the Seventh Circuit unanimously affirmed. See In re Humira (Adalimumab) Antitrust Litig., 465 F. Supp. 3d 811 (N.D. Ill. 2020), aff’d sub nom. Mayor & City Council of Baltimore v. AbbVie Inc., 42 F.4th 709 (7th Cir. 2022).
  • Won the dismissal with prejudice of antitrust claims alleging that ExxonMobil Corp. conspired with competing oil companies and foreign governments to restrict the global production of oil during the COVID-19 pandemic. See D’Augusta v. Am. Petroleum Inst., No. 22-cv-1979-JSW, 2023 WL 137474 (N.D. Cal. Jan. 9, 2023).
  • Defended ExxonMobil Corp. against an antitrust class action alleging that oil refiners colluded to increase California gasoline prices by reducing the supply of gasoline to the state. In September 2022, the district judge granted summary judgment in favor of ExxonMobil and its co-defendants, extinguishing claims seeking tens of billions of dollars in total damages. See Persian Gulf Inc. v. BP W. Coast Prods., LLC, 632 F. Supp. 3d 1108 (S.D. Cal. 2022).
  • Obtained summary judgment on behalf of Par Sterile Products LLC and Par Pharmaceutical Cos., Inc. in an antitrust case alleging that the defendants monopolized the market for a life-saving injectable product by entering into unlawful exclusive agreements with suppliers of the active pharmaceutical ingredient used to manufacture the product. See Fresenius Kabi USA, LLC v. Par Sterile Prods., LLC, No. 16-4544 (SDW) (LDW) (D.N.J. Oct. 1, 2021), Dkt. 265.
  • Wrote the winning summary judgment brief on behalf of Samsung Electronics Co. Ltd. in In re Optical Disk Drives Antitrust Litigation, wiping out class plaintiffs’ multi-billion-dollar treble damages claims against the world’s leading electronics manufacturers. In November 2019, the Ninth Circuit upheld the decision. See In re Optical Disk Drive Antitrust Litig., No. 10-md-2143-RS, 2017 WL 6503743 (N.D. Cal. Dec. 18, 2017), aff’d, 785 F. App’x 406 (9th Cir. 2019).
  • Currently represent Alaska Airlines in regulatory proceedings and in private litigation in connection with Alaska’s proposed merger with Hawaiian Airlines.
  • Currently represent Asiana Airlines in regulatory proceedings in connection with its proposed merger with Korean Airlines.
  • Currently represent TransUnion in a class action alleging that the three major credit bureaus conspired to reduce the quality of credit-reporting services.
  • Represented Global Music Rights in a years-long antitrust battle against the Radio Music License Committee. Stephen and his colleagues ultimately negotiated an extremely favorable settlement for Global Music Rights.
  • Represented Impax Laboratories at trial in a Federal Trade Commission enforcement action challenging an alleged “reverse-payment” patent settlement. Stephen took the direct examination of Impax’s principal economic expert at trial and wrote Impax’s post-trial briefs.
  • Represented legendary boxing promoter Top Rank in a high-profile antitrust and unfair competition lawsuit against a famous boxing magnate. After defeating a hard-fought motion to dismiss, the O’Melveny team obtained a favorable settlement with significant monetary and structural relief for Top Rank.
  • Defended Asiana Airlines in multi-district litigation alleging a global price-fixing conspiracy in the air cargo shipping industry.
  • Successfully represented multiple asylum seekers and refugees seeking protection in the United States.


Bar Admissions

  • California

Court Admissions

  • US District Court for the Central, Eastern, and Northern Districts of California
  • US District Court for the Northern District of Florida
  • US Court of Appeals, Third and Ninth Circuits


  • Duke University, J.D.
  • Duke University, M.A., East Asian Studies
  • Brigham Young University, B.A., Chinese: magna cum laude

Honors & Awards

  • Named to the “40 & Under” list in Competition and Antitrust by Benchmark Litigation (2022, 2024)
  • Recognized as “Up & Coming” by Chambers USA for Antitrust: California (2023)
  • Recommended by The Legal 500 US for Civil Litigation/Class Actions: Defense (2022-2023)
  • Recognized by Law360 as a “Top Attorney Under 40” in Competition (2022)
  • Selected as one of The Daily Journal’s “Top Antitrust Lawyers in California” (2021)

Professional Activities


  • Executive Committee, Antitrust and Unfair Competition Law Section of the California Lawyers Association (2019-2022)
  • Editor-in-Chief, Competition, Volume 32 (2022)
  • Executive Committee, Antitrust and Unfair Business Practices Section of the Los Angeles County Bar Association (2018-2020)


  • “The FTAIA’s “Domestic Effects” Exception: Why the Ninth Circuit Got It Right,” Competition (Fall 2020)
  • “May I Have Another? Antitrust Immunity For Serial Petitioning,” The Daily Journal (June 24, 2020)
  • “Private Rights and Public Wrongs: Fair Use as a Remedy for Private Censorship,” Gonzaga Law Review (2012-2013)
  • “The Yang Obeys, But the Yin Ignores: Copyright Law and Speech Suppression in the People’s Republic of China,” UCLA Pacific Basin Law Journal (2012)
  • “Trying to Agree on Three Articles of Law: The Idea/Expression Dichotomy in Chinese Copyright Law,” Cybaris: An Intellectual Property Law Review (2010)


  • “High Court Disgorgement Ruling Doesn’t Empower FTC,” Law360 (July 8, 2020)
  • “Extraterritoriality After Vitamin C: Are We Between a Rock and a Hard Place?”, Antitrust Magazine (Fall 2018)
  • Antitrust Class Actions After the Supreme Court’s 2015 Term,” Bloomberg BNA Antitrust & Trade Regulation Report (November 2015)
  • “Where to Draw the Line: Should the FTAIA’s Domestic Effects Test Apply in Criminal Prosecutions?”, Antitrust Magazine (Summer 2015)
  • “The Continuing Violations Doctrine: Limitation in Name Only, or a Resuscitation of the Clayton Act’s Statute of Limitations?”, Competition (Spring 2015)
  • “The Continuing Relevance of Patent Validity in Reverse-Payment Litigation,” Concurrences (Spring 2014)
  • “Preserving Legal Privileges in the U.S., California, and the EU,” Antitrust Report (December 2012)
  • United States Chapter, Intellectual Property and Antitrust: Getting the Deal Through (2012-2016 editions)


  • “Antitrust Ethics In Action,” 33rd Annual Golden State Antitrust and Unfair Competition Law Institute (October 26, 2023)
  • “U.S. Antitrust and Intellectual Property Law: Current Issues & Trends,” Fronteo Webinar (October 4, 2023)
  • FTC v. Actavis and Patent Settlements: What Have We Learned After 10 Years?”, O’Melveny & Myers LLP Life Sciences CLE Day (June 6, 2023)
  • “Antitrust Enforcement in 2021: What to Expect From the Biden Administration and Global Enforcers,” O’Melveny & Myers LLP Webinar (February 18, 2021)
  • “At the Intersection of Antitrust & Intellectual Property: Recent Trends,” CLE Presentation (October 2018)
  • “Product Hopping, Life Cycle Management, and the Namenda and Doryx Decisions,” O’Melveny & Myers LLP Life Sciences CLE Marathon (September 29, 2016)
  • Guest lectures on cartel enforcement at the University of Southern California Gould School of Law (April 2015, April 2016)
  • “Beyond FTC v. Actavis: Recent and Emerging Issues at the Intersection of Antitrust and the Pharmaceutical Industry,” Antitrust and Unfair Business Practices Section of the L.A. County Bar Association (May 29, 2015)
  • “Courtroom Drama with Chinese Characteristics: A Comparative Approach to Legal Process in Chinese Cinema,” 64th Annual Kentucky Foreign Language Conference, East Asian Studies Division, University of Kentucky (April 14-16, 2011)