Leo Caseria is a partner in the Antitrust and Competition Practice Group in the Washington, D.C. and Los Angeles offices. 

Areas of Practice

Leo’s areas of expertise include antitrust, price gouging, and HSR and merger clearance.

Antitrust:  Leo advises companies on antitrust issues arising in civil litigation and government investigations.  He also counsels companies on antitrust issues relating to mergers and acquisitions and proposed or contemplated business strategies. He has litigated numerous antitrust cases in federal and state courts, including cases based on alleged price-fixing, market allocation, boycott, monopolization and attempted monopolization. His antitrust litigation experience includes trial and appeal.

Price gouging:  Leo also advises companies on compliance with price gouging laws during periods of emergency.  He has led the defense of several companies targeted in price gouging complaints or government investigations, in multiple states.  These matters include COVID-19 price gouging allegations relating to eggs and other food items and consumer goods.

HSR and merger clearance:  Leo advises companies regarding the requirements under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, and has prepared numerous HSR filings for proposed transactions.  Leo also represents clients before the U.S. Department of Justice and the Federal Trade Commission in connection with related government antitrust investigations. 

Leo serves as Co-Chair of the Books and Treatises Committee of the ABA’s Antitrust Section, which publishes several antitrust handbooks each year.  He has been recognized by Legal 500 and Super Lawyers.



Representative Engagements:

Price Gouging

  • Defending JRK Residential Group, Inc. against putative class action alleging price gouging of rental rates for housing in California following wildfire emergencies.  Felker v. JRK Residential Group, Inc., Case No. SCV-267587 (Sonoma County Superior Court)
  • Defended Save Mart against putative class action alleging price gouging of eggs in California.  Plaintiff asserted a single claim under California’s Unfair Competition Law, Cal. Bus. & Prof. Code section 17200, predicated upon an alleged violation of California Penal Code section 396, which prohibits price gouging.  Claim against Save Mart was voluntarily dismissed after Save Mart filed a motion to dismiss.  Fraser v. Cal-Maine Foods, Inc., Case No. 20-2733 (N.D. Cal.).
  • Defended Amerifoods against putative class action alleging price gouging of eggs in California.  Plaintiff asserted claims under California’s Unfair Competition Law, Cal. Bus. & Prof. Code section 17200, predicated upon an alleged violation of California Penal Code section 396, which prohibits price gouging.  Claims against Amerifoods voluntarily dismissed.  Elander v. Rose Acre Farms, Inc., Case No. 20STCV33673 (Los Angeles County Superior Court).
  • Representing four major retail grocery chains in connection with government price gouging investigations or complaints in California, Nevada, Oregon, and Washington, at both the state and local county level, relating to products including eggs, gloves, bottled water, toilet paper, and disinfectant wipes. 

Antitrust Litigation

  • Defending honey importer Export Packers Company Limited dba Odem International against an antitrust and RICO class action brought by a putative class of U.S. domestic beekeepers, relating to a purported conspiracy to sell foreign fake honey and harm the U.S. domestic genuine honey market.  Henry’s Bullfrog Bees v. Sunland Trading, Inc., Case No. 2:21-CV-00582-TLN-CKD (E.D. Cal.).

  • Defending The Reynolds and Reynolds Company against state and federal antitrust claims relating to data management system access. Monopolization and attempted monopolization claims dismissed at pleading stage. Motor Vehicle Software Corporation v. CDK Global, Inc., Case No. 17-896 (C.D. Cal. Order dated Oct. 2, 2017).
  • Representing CalPortland in antitrust case against four major railroads accused of allegedly price-fixing rate-based rail fuel surcharges.  CalPortland Company v. BNSF Railway Company, Case No. 2:20-cv-03659 (C.D. Cal.).
  • Defended CalPortland against False Claims Act claims premised on alleged conspiracy to fix prices and allocate markets relating to cement, concrete and asphalt. All claims dismissed; affirmed by Ninth Circuit. U.S. ex rel. Rune Kraft v. CalPortland Construction, Case No. 16-4479 (C.D. Cal. order dated Mar. 9, 2018), aff’d, Case No. 18-55594 (9th Cir. opinion dated Apr. 7, 2020).
  • Defended Samsung SDI against price-fixing actions brought by Oregon Attorney General relating to cathode ray tubes. On a motion argued by Leo, Samsung SDI obtained an order capping the State of Oregon’s potential antitrust civil penalties to a maximum of $2.5 million, subject to possible additional reductions, as opposed to the potential maximum penalty of $375 million. State of Oregon v. LG Electronics, Inc., Case No. 1208-10246 (County of Multnomah, Order dated Nov. 23, 2016).

Antitrust Merger Clearance

  • Represented Lakin Tire in its sale to Liberty Tire Recycling. 
  • Represented OverDrive in its sale to KKR. 
  • Represented Shultz Steel Company in its acquisition by Precision Castparts Corp., a division of Berkshire Hathaway Inc.
  • Represented CalPortland Company in its acquisition of Martin Marietta’s California cement business.



  • Competition Future Leader, GCR Who’s Who Legal, 2021

  • Next Generation Lawyers, Legal 500, 2019-2021
  • Antitrust, Legal 500, 2015, 2017, 2019-2021
  • Southern California Super Lawyer, Super Lawyers, 2021
  • Southern California Rising Star, Super Lawyers, 2018-2020



Antitrust Law Blog Posts

Antitrust Books and Handbooks

  • Editor, Handbook on Antitrust in Technology Industries, ABA Section of Antitrust Law, 2017
  • Editor, State Action Practice Manual, ABA Section of Antitrust Law, Third Edition, 2017
  • Editor, Antitrust Evidence Handbook, ABA Section of Antitrust Law, Third Edition, 2016
  • Editor, Handbook on the Scope of Antitrust, ABA Section of Antitrust Law, 2015
  • Contributor, 2012 Annual Review of Antitrust Law Developments, ABA Section of Antitrust Law, 2013
  • Senior Editor, Handbook on Multijurisdictional Competition Law Investigations, ABA Section of Antitrust Law, 2010

Media Mentions

Speaking Engagements

  • "B2B Noncompetes and the Rule of Reason," Los Angeles County Bar Association Webinar, October 8, 2020
  • "Joint Conduct 101: Information Exchange," ABA Section of Antitrust Law, Joint Conduct Committee, October 20, 2016



  • Co-Chair, Books and Treatises Committee, ABA Section of Antitrust Law, 2016-2023
  • Member, Antitrust and Unfair Competition Law Section, State Bar of California
  • Vice Chair, Books and Treatises Committee, ABA Section of Antitrust Law, 2014-2015

Digital Media


J.D., Columbia Law School, 2005, Harlan Fiske Stone Scholar

B.A., University of California, Los Angeles, 2002


  • California
  • District of Columbia
  • U.S. Court for the Ninth Circuit
  • U.S. District Court, Central District of California
  • U.S. District Court, Eastern District of California
  • U.S. District Court, Northern District of California
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