Peter Guryan

Peter Guryan, Global Co-Chair of the Firm’s Antitrust and Trade Regulation Practice, is a Partner resident in the Firm’s New York office. Peter has extensive experience in civil and criminal antitrust matters for major corporations and private equity firms. He has represented clients in obtaining antitrust approvals in numerous high-profile and challenging transactions, often global in scope, and in other government antitrust investigations before the Department of Justice, the Federal Trade Commission and competition authorities outside of the United States. 

Peter’s recent work highlights include:

• L3Harris Technologies, Inc. in its $4.7 billion acquisition of Aerojet Rocketdyne Holdings;
• U.S. Bancorp in its $8 billion acquisition of MUFG Union Bank;
• DigitalBridge and IFM Investors in their joint acquisition of Switch, Inc.;
• New Mountain Capital in its significant growth investment in Grant Thornton, and separately, in its acquisition of Broadcast Music;
• Thompson Street Capital Partners and its portfolio company, Media Radar, in Media Radar’s acquisition of Vivvix;
• COPEC in its sale of its North American MAPCO Network;
• IFM in its acquisition of GreenGas;
• Stonepeak in its $2.4 billion acquisition of safety business from Intrado;
• Integrum in partnership with Strategic Risk Solutions;
• The Cosmopolitan of Las Vegas in its $5.65 billion acquisition by MGM Resorts International;
• Apria in its $1.6 billion acquisition by Owens & Minor, Inc.;
• Bentley Systems in its acquisition of Power Line Systems for approximately $700 million;

• Refinitiv as global antitrust counsel in its $27 billion acquisition by London Stock Exchange Group;

• The Bountiful Company in its $5.75 billion acquisition by Nestlé;

• First Data Corporation as global antitrust counsel in connection with obtaining antitrust approvals for its $22 billion merger with Fiserv;

• L3 Technologies, Inc. in connection with the antitrust review of its $33.5 billion merger of equals combination with Harris Corporation;

• Buckeye Partners in its $435 million acquisition by Magellan Midstream Partners;

• Ferro Corporation in its $2.1 billion acquisition by Prince International Corporation;

• La Quinta in its sale to Wyndham Worldwide for $1.95 billion in cash;

• Blackstone and related portfolio companies, as antitrust counsel, in a variety of transactions, including: Array Technologies; AIG’s Life & Retirement business; Ancestry; Emerson; Hilton Copacabana; MagicLab; MB Aerospace; and Thomson Reuters’ Financial & Risk Business;

• Sedgwick in connection with its acquisition of York Risk Services Group;

• Gerdau S.A. in connection with its sale of certain U.S. steel operations to Commercial Metals Company;

• KKR and related portfolio companies, as antitrust counsel, in a variety of transactions, including: BMC Software; Broadcom; Envision Healthcare; NielsenIQ; and PharMerica;

• NXP Semiconductors N.V. in connection with its $11.8 billion acquisition of Freescale Semiconductor, Ltd.;

• ChemChina in securing antitrust clearance for its $43 billion acquisition of Swiss agrochemical company Syngenta AG; and

• Tradeweb Markets in an antitrust class action alleging several financial institutions and trading platforms conspired to limit competition in the $320 trillion market for interest rate swaps; secured a dismissal of all claims.

Prior to joining Simpson Thacher, Peter was a partner at Fried Frank. He began his career at the Antitrust Division of the Department of Justice where he played a significant role in the successful challenge of the proposed merger between WorldCom and Sprint. In addition, he was a law clerk to the Honorable Harold A. Ackerman on the United States District Court for the District of New Jersey.

Peter is consistently recognized by Chambers USA: America’s Leading Lawyers for Business as a leading individual in Antitrust and by Legal 500 in Antitrust: Merger Control. Chambers describes Peter as “extraordinarily gifted at both the artistic and technical side of antitrust law around the world” and “particularly noted for his merger clearance work.” Commentators add, “[h]e is practical, commercial and strategic” and “a respected merger lawyer.” A Legal 500 source said, “it’s impossible to say too many positive things about Peter . . . he is extremely intelligent, responsive, respectful and practical.” Peter was also recently shortlisted for “Dealmaker of the Year” by Global Competition Review in its GCR 2024 Awards.

Peter is admitted to the bar in New York and to practice before the United States District Court for the Southern District of New York. He received his J.D., cum laude, in 1996 from Cornell Law School and his B.A. in 1992 from Cornell University.