Kay Lynn Brumbaugh
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Kay Lynn Brumbaugh | Best Lawyers: Lawyer of the Year 2017 Litigation – Antitrust Dallas - Fort Worth


Contact Information


1717 Main Street
Suite 3700
Dallas, TX 75201
P: +1.214.659.4702
F: +1.214.659.4401

Washington, DC

1350 I Street, NW
Suite 1100
Washington, DC 20005
P: +1.202.662.3066
F: +1.202.662.2739

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Kay Lynn Brumbaugh


Dallas Office
1717 Main Street
Suite 3700
Dallas, TX 75201
P: +1.214.659.4702
F: +1.214.659.4401
Other Offices: Washington, DC

Kay Lynn, Chair of the firm's Antitrust Practice Group, represents clients in the areas of antitrust litigation and counseling, class actions, and other complex commercial and business litigation matters. She also represents clients in connection with investigations by the Federal Trade Commission, the Department of Justice Antitrust Division and various states’ attorneys general. Her antitrust representation encompasses assisting clients in obtaining antitrust clearance from federal and state authorities in connection with merger and acquisition transactions. Kay Lynn has provided representation for clients in many industries including energy, food and beverage, franchising and distribution, direct sales, consumer products, manufacturing, health care, insurance, internet and e-commerce, transportation and telecommunications.

Kay Lynn is a member of the leadership of the American Bar Association Antitrust Section, serving as Co-Chair of the Books and Treatises Committee. Kay Lynn was selected by Benchmark Litigation as one of the top 250 women in litigation in the country (2012-2016) and was profiled as a leading antitrust lawyer in Texas in Chambers USA, America's Leading Lawyers for Business (2007-2017). She has also been recognized as one of The Best Lawyers in America for Antitrust Law (2010-2017).

Representative Experience

Representative Antitrust Litigation & Government Investigations

  • Co-lead counsel for Enterprise Products Partners L.P. in post-closing investigation by the Federal Trade Commission of Enterprise’s $6 billion merger with Oiltanking Partners. Investigation closed with no action taken.
  • Represented American Trailer Works in the Department of Justice review of its acquisition by Bain Capital Private Equity and subsequent merger with Big Tex Trailers. Investigation closed with no action taken.
  • Represented ArcLight Energy Partners in the Federal Trade Commission’s investigation of ArcLight’s acquisition of the Gulf Oil business from Cumberland Farms. Reached negotiated consent decree.
  • Represented SMH Theatres, Inc. (StarPlex Cinemas) in the Department of Justice investigation of its sale to AMC Entertainment Holdings. Reached negotiated consent decree.
  • Represented Regency Energy Partners LP in merger investigation by the Federal Trade Commission of Regency's $1.3 billion acquisition of the midstream business of Eagle Rock Energy Partners. Investigation closed with no action taken.
  • Represented a defendant in In re Online Travel Company (OTC) Hotel Booking Antitrust Litigation, a series of consolidated putative class actions in the travel industry. Motion to dismiss granted.
  • Defended Hilcorp Alaska LLC in investigations by the Federal Trade Commission and the State of Alaska in connection with the acquisition of Marathon Oil's assets in the Cook Inlet of Alaska. FTC investigation closed with no action taken; State of Alaska investigation resolved with negotiated consent decree.
  • Currently representing a dairy processor defendant in In re Southeastern Milk Antitrust Litigation, a series of coordinated putative class actions alleging conspiracies to reduce prices paid to dairy farmers for raw milk and to raise prices charged to purchasers of processed milk.
  • Represented individual executive in Packaged Ice industry investigation by the Antitrust Division of the Department of Justice. Investigation was closed in 2010 with no action taken.
  • Represented a key third party witness resulting in FTC successfully prevailing in its Section 5 horizontal price-fixing claims against respondents and obtaining a consent order prohibiting, among other things, collective negotiations with payors. [In the Matter of North Texas Specialty Physicians, FTC Docket No. 9312 (2005)]
  • Defeated class certification in price-fixing conspiracy case; order denying class certification affirmed by the Fifth Circuit Court of Appeals. Briefed and argued case at Fifth Circuit. [Piggly Wiggly Clarksville, Inc. v. Interstate Brands Corp., 100 Fed. Appx. 296 (5th Cir. 2004)].
  • Dismissal and summary judgment affirmed by the Fifth Circuit Court of Appeals in case alleging exclusive dealing, monopolization and state law tort claims. Primary responsibility for handling case at district court level; briefed and argued case at Fifth Circuit. [Apani Southwest, Inc. v. Coca-Cola Enterprises Inc., 300 F.3d 620 (5th Cir. 2002)].
  • Defended Dallas physician organization in price-fixing investigation by the Federal Trade Commission. Case successfully resolved with consent decree and no fines or damages paid by client. [In the Matter of System Health Providers, Inc. and Genesis Physicians Group, Inc., FTC File No. 011 0196, FTC Docket No. C-4064 (2002)].

Recent Antitrust Representation in M&A Transactions

Kay Lynn has recently advised clients on HSR and antitrust matters in connection with the following merger & acquisition transactions:

  • E&P clients in multiple acquisitions and divestitures of oil and natural gas assets.
  • Solid waste company in its acquisition of competitor in Florida.
  • Midstream MLP in its $1.5 billion contribution of interests in gas gathering company.
  • Leading prepaid card provider in its acquisition of corporate incentives and promotions company.
  • Chemical company in its $175 million acquisition of PVC pipe business
  • Solid waste company in its sale to infrastructure investment fund.
  • Drone manufacturer in its sale to large defense manufacturer. Transaction recognized as the Aerospace and Defense "Deal of the Year-2012."
  • LNG company in its sale of over $1 billion in non-corporate interests to leading investment firm.
  • Independent oil refiner in connection with its $7 billion merger of equals with another leading refiner.
  • Large Canadian midstream company in its $3.1 billion merger with Canadian pipeline operator. Deal was awarded the 2012 Energy Industry Award by Canadian Dealmakers.
  • Finnish refining and marketing company in its sale of iso-octane assets to Canadian midstream company.
  • Large midstream joint venture in its $1.925 billion acquisition of the membership interests of a natural gas liquids storage, processing and transportation business.
  • Metal service center company in its $415 million acquisition by the industry leader.
  • Global engineering, construction and services company in its $280 million acquisition of an engineering, procurement and construction services firm.

Antitrust Counseling

Kay Lynn also provides ongoing antitrust counseling and compliance training for firm clients on a wide variety of issues, including pricing, joint ventures, exclusive dealing arrangements, bidding and contract issues.

Additional Representative Matters

  • Member of defense team that obtained jury verdict in the trial of horizontal price fixing claims brought by a class with more than 52,000 class members [Tucker v. Interstate Brands Corporation, District Court, Johnson County, Texas, 1998].
  • Member of team defending DFW International Airport Board in antitrust lawsuit involving the repeal of the Wright Amendment. Obtained motion to dismiss in client’s favor. [Love Terminal Partners, L.P. v. The City of Dallas, 527 F. Supp. 2d 538 (N.D. Tex. 2008)].
  • Defended soft drink distributor in antitrust trial and on appeal in which competitors alleged state antitrust claims relating to promotional and advertising agreements. Won case on appeal before the Texas Supreme Court in October 2006. [Coca-Cola Co. v. Harmar Bottling Co., 111 S.W.3d 287 (Tex. 2006)].
  • Arbitration hearing defense in 2006 for major automobile manufacturer in a commercial lease and property condition dispute. Plaintiff sought termination of long-term lease and millions in damages. Arbitration panel denied termination request and awarded no monetary damages.
  • Represented major health insurer in investigation by the Federal Trade Commission related to alleged price fixing by a physician organization.
  • Represented direct marketing company in investigation by Minnesota Attorney General. No action taken against client.
  • Represented national hotel and real estate franchisors in multiple breach of contract and trademark lawsuits against franchisees. Obtained injunctions and/or favorable settlements.
  • Advised a well servicing company in its $180 million acquisition of a group of companies providing complementary services.
  • Advised a major drilling company in the $510 million sale of its land drilling business.
  • Represented a refiner in the sale of its Tulsa refinery to another refiner.
  • Advised a large independent refiner in its $1.2 billion acquisition of another refiner.
  • Represented a natural gas storage company in its $750 million sale to another natural gas storage company.
  • Represented a midstream natural gas services provider in its acquisition of interests in a natural gas pipeline.



Professional Recognition







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