John H. Lyons
John H. Lyons represents clients in connection with the antitrust aspects of mergers and acquisitions, government civil non-merger investigations, class action litigation and corporate compliance counseling in a wide range of industries, including in particular electric power, chemicals, oil and gas, and financial exchanges and products.


Mr. Lyons’ representative M&A matters include:

  • Allegheny Energy in its $4.7 billion acquisition by FirstEnergy;
  • The Bureau of National Affairs in its $990 million acquisition by Bloomberg L.P.;
  • CME Group in its $11.8 billion contested acquisition of Chicago Board of Trade, its $9.3 billion acquisition of NYMEX, its index services joint ventures with McGraw-Hill and with Dow Jones & Co., and its $1 billion global preferred strategic partnership with Brazilian exchange operator BM&F Bovespa S.A.;
  • Coastal Corporation in its $24 billion merger with El Paso Energy;
  • Compaq in its $25 billion merger with Hewlett-Packard;
  • Duke Energy and Progress Energy in their $13.7 billion merger;
  • Duke Energy in its $9.1 billion merger with Cinergy;
  • Dynegy in its proposed concurrent acquisitions of assets from Energy Capital Partners and Duke Energy totaling $6.25 billion, and its acquisition of assets from Ameren Corp.;
  • Ecolab in its $2.3 billion acquisition of Permian Mud Services;
  • Entergy Corporation in its joint venture with Koch Industries and in various asset acquisitions;
  • Exelon and Pepco Holdings Inc. in Exelon’s proposed $6.8 billion acquisition of PHI;
  • Exelon in its $7.9 billion acquisition of Constellation Energy, its proposed $15 billion merger with Public Service Enterprise Group and its proposed $7.5 billion acquisition of NRG Energy;
  • GenOn Energy in its $1.8 billion acquisition by NRG Energy;
  • Global Santa Fe in its $18 billion acquisition by Transocean;
  • Great Plains Energy in its $1.7 billion acquisition of Aquila;
  • LANXESS in its $2.5 billion acquisition of Chemtura Corporation;
  • LCY Chemicals in its proposed $900 million global combination with Kraton Performance Polymers;
  • Marathon Ashland Petroleum in its $1.2 billion acquisition of assets from Ultramar Diamond Shamrock;
  • Marubeni in its $5.3 billion acquisition of Gavilon Group;
  • Merck KGaA in its proposed $17 billion acquisition of Sigma-Aldrich, its $7.2 billion acquisition of Millipore and its $275 million sale of EMD CropBioscience;
  • National Grid in its $11.8 billion acquisition of KeySpan and its $2.9 billion sale of the Ravenswood generating station in New York City to TransCanada; and
  • Wisconsin Energy in its proposed $9.1 billion acquisition of Integrys Energy and related asset sales.

Mr. Lyons’ representations in civil non-merger government investigations and litigations include:

  • Arch Chemicals in litigation with Advanced Micro Devices (W.D. Tex.);
  • Entergy in a U.S. Department of Justice monopolization investigation;
  • Glencore subsidiary Pacorini Metals in two multidistrict litigations: In re Aluminum Warehousing Antitrust Litigation (SDNY) and In re Zinc Warehousing Antitrust Litigation (SDNY);
  • National Grid and its subsidiary KeySpan in a U.S. Department of Justice investigation and settlement by consent decree of competitive issues in the New York City electric power capacity market, and in federal and state follow-on class actions filed in the U.S. District Court for the Southern District of New York and in New York Supreme Court in Bronx County, through successful appeals in the U.S. Court of Appeals for the Second Circuit and the New York Supreme Court, Appellate Division 1st Department;
  • New York Mercantile Exchange in its dispute with Intercontinental Exchange, Inc. (Southern District of New York);
  • a petroleum refiner/marketer in a non-public U.S. Federal Trade Commission investigation of possible price-fixing in Midwest gasoline markets; and
  • a trading company in a non-public U.S. Department of Justice investigation of outage information sharing and possible collusion among electricity generators in California.

Mr. Lyons repeatedly has been selected for inclusion in The Legal 500 United States and was named a 2016 "Client Service All-Star" by The BTI Consulting Group for providing outstanding client service.



  • J.D., American University Washington College of Law, 1994
  • M.P.A., American University, 1991
  • A.B., Harvard University, Harvard College, 1983


  • District of Columbia

John H. Lyons