Mi Hyun (Angela) Yoon


Yoon, Mi Hyun (Angela)

Angela Yoon's practice focuses on antitrust law, including merger clearance, civil litigation, and criminal cartel investigations. Her clients include companies in the automotive, biotech, energy, financial, oil field services, pharmaceutical, semiconductor and wireless communications industries.

Ms. Yoon has represented clients in cross-border criminal and civil investigations by the Department of Justice, the Federal Trade Commission and foreign authorities, as well as in litigation involving the intersection of antitrust and intellectual property rights. She has been a member of multiple WilmerHale trial teams in both federal and state courts. She also assisted clients with securing merger clearance before the Department of Justice and the Federal Trade Commission, as well as with addressing privacy and data security issues.

Past Experience

Prior to joining the firm, Ms. Yoon worked as a law clerk at the Bureau of Competition at the Federal Trade Commission. During her time there, she reviewed Hart-Scott-Rodino (HSR) filings and assisted in merger investigations.

From 2010 to 2011, Ms. Yoon worked as a field placement intern at the US Securities and Exchange Commission, where she conducted investigations and research in the enforcement, bankruptcy and litigation groups, and at the Coca-Cola Company, where she assisted clients on various corporate transactions and regulatory antitrust matters. She also served as a judicial extern for the Honorable Ronald A. Guzmán of the US District Court for the Northern District of Illinois.

From 2005 to 2008, Ms. Yoon worked as an associate in the Finance Practice of Charles River Associates in Boston, where she assisted economic and damages experts in complex securities litigation matters.


  • Trading in a Flash: Implication of High-Frequency Trading for Securities Regulators Worldwide, 24 EMORY INT’L L. REV. 913 (2010)

Publications & News


January 24, 2017

Facelift for Two Millennials: DOJ and FTC Update Guidelines for IP Licensing and International Enforcement

Earlier this month, the Department of Justice and the Federal Trade Commission issued the very first update to their IP Licensing Guidelines since April 1995. The agencies also published updated International Antitrust Guidelines. This WilmerHale Client Alert was republished in The Licensing Journal.

July 13, 2016

Civil Fines Jump Across Agencies Under Inflation Adjustment Act

Civil fines across federal agencies have recently been increased dramatically under the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015 (2015 Act) (Sec. 701 of Public Law 114-74), with some more than doubling. Companies violating the Hart-Scott-Rodino (HSR) Improvements Act, the Securities and Exchange Act, or the Occupational Safety and Health Act (OSHA), among others, could soon face civil monetary penalties that are up to 150% higher than the existing levels. According to the Congressional Budget Office, the 2015 Act would increase the federal government's revenue by $1.3 billion over the next ten years.

Recent Highlights

  • Represented a major cellular handset manufacturer in multiple patent infringement and antitrust lawsuits involving wireless communications and claims related to standard-setting participation and FRAND licensing commitments
  • Represented a global auto parts supplier in response to criminal cartel investigations by the US Department of Justice and foreign authorities
  • Represented a pharmaceutical company in Hatch-Waxman patent settlement cases in the Eastern District of Pennsylvania, including those brought by the Federal Trade Commission and purported purchaser classes
  • Assisted a novel therapeutics company in securing antitrust clearance from the Federal Trade Commission for a $675 million merger with a global pharmaceutical company
  • Provided guidance to a national retailer involved in a data breach

Professional Activities

Ms. Yoon is a member of the Antitrust Section of the American Bar Association. She also participated as a judge in a nationwide mock trial tournament at Tufts University in 2014.


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JD, Emory University School of Law, 2011, Notes & Comments Editor, Emory International Law Review

BA, Economics, Cornell University, 2005

Bar Admissions


District of Columbia



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