Damian G. Didden
Damian G. Didden practices in Wachtell, Lipton, Rosen & Katz’s Antitrust Department where he advises clients on various aspects of competition law matters. Mr. Didden’s particular focus is analyzing the antitrust risk of mergers and acquisitions, and guiding clients through the merger review process before federal, state and foreign regulators. He has advised clients engaged in a diverse spectrum of sectors, including: telecommunications, banking and financial services, entertainment and media, Internet-based services, technology and software, defense, retail operations, and manufacturing, among other industrial classifications. Mr. Didden became partner at Wachtell Lipton in January 2009.
Mr. Didden joined the firm as an associate in 2001, after spending two years as a trial attorney with the Antitrust Division of the United States Department of Justice. While at the Antitrust Division, Mr. Didden investigated several high-profile merger transactions, including GE/Honeywell and Viacom/CBS, among others. Prior to joining the Antitrust Division, he was a law clerk for the Honorable Hector M. Laffitte, Chief Judge of the U.S. District Court for the District of Puerto Rico.
Mr. Didden received an A.B. cum laude in Philosophy from Boston College, where he completed the Arts & Sciences Honors Program in 1992. He received a J.D. cum laude from the Georgetown University Law Center in 1997. Mr. Didden is admitted to practice in Maryland and New York. He is a member of the American Bar Association’s Antitrust Section.
- FTC Proposes Sweeping Changes to HSR Reporting Obligations,
in NYU Law School’s Blog on Compliance and Enforcement, July 6, 2023.
- Antitrust and ESG,
in Columbia Law School’s Blog on Corporations and the Capital Markets, January 18, 2023 and Harvard Law School Forum on Corporate Governance, January 31, 2023.
- Keep Politics Out of Bank Merger Antitrust Policy,
in Columbia Law School’s Blog on Corporations and the Capital Markets, August 12, 2021.
- Revising Bank Merger Guidelines,
in The Banking Law Journal, Volume 138 Number 1, January 2021.
- ESG Factors and Antitrust,
in Harvard Law School Forum on Corporate Governance and Financial Regulation, February 27, 2020.
- District Court Denies Preliminary Injunction in FTC's "Potential Competition" Merger Case,
in Bank and Corporate Governance Law Reporter Volume 55 Number 3, November 2015.
- U.S. Antitrust Agencies Issue Final New Horizontal Merger Guidelines,
in Bank and Corporate Governance Law Reporter Volume 45 Number 3, November 2010.