Ashley (Lee) McMahon
Counsel | She/Her/Hers
Overview
When businesses and individuals face high-stakes antitrust issues, Ashley (Lee) McMahon delivers with confidence and competence. Lee’s broad practice covering complex civil and criminal litigation, government investigations, mergers and acquisitions, and premerger filings uniquely situates her to advise clients adeptly on all areas of competition law.
Career & Education
- Connecticut College, B.A., magna cum laude, 2009
- University of Virginia School of Law, J.D., 2016
- District of Columbia
- Virginia
- U.S. District Court for the District of Columbia
Professional Activities and Memberships
- American Bar Association
- Antitrust Section
- Washington Council of Lawyers
- American Bar Association
Ashley (Lee)'s Insights
Client Alert | 3 min read | 02.13.26
In October 2024, the FTC adopted a final rule that substantially modified the HSR form, requiring new categories of information and documents. The final rule was the most significant overhaul of the HSR premerger notification requirements in decades. The new requirements imposed additional time and expense on merging parties, with the FTC estimating that the new form would likely take triple the amount of time to complete than the previous form. Numerous groups, including the U.S. Chamber of Commerce, sued to challenge the rule.
Client Alert | 1 min read | 01.20.26
Client Alert | 6 min read | 05.16.25
Recent Antitrust Enforcer Statements Signal New Administration’s Direction and Priorities
Client Alert | 3 min read | 02.27.25
No-Poach Not Going Anywhere: FTC Chair Announces New Labor Task Force
Representative Matters
- Represented a Japanese automotive parts manufacturer in In re Automotive Parts Antitrust Litigation, the multi-district litigation stemming from the largest criminal antitrust investigation in U.S. history” into cartel allegations.
- Represented an aerospace and defense company in class action litigation stemming from a grand jury indictment alleging no-poach agreements.
- Represented a major regional health care provider in class action litigation alleging no-poach agreements.
- Represented client in a grand jury investigation alleging no-poach agreements.
- Represented a multinational telecommunications company in the premerger filing and Second Request process of a billion-dollar sale of an anime streaming business.
- Represented a private equity client in its acquisition of a billion-dollar aerospace & defense products and medical products manufacturer.
- Represented a health care IT solutions company in an FTC investigation and follow-on class action litigation alleging exclusive dealing arrangements related to e-prescriptions.
- Represented a mission critical communications enterprise as a third party in an FTC investigation in the law enforcement body-worn camera industry.
- Represented a pharmaceutical manufacturer in multi-district litigation alleging price-fixing of generic drugs.
Ashley (Lee)'s Insights
Client Alert | 3 min read | 02.13.26
In October 2024, the FTC adopted a final rule that substantially modified the HSR form, requiring new categories of information and documents. The final rule was the most significant overhaul of the HSR premerger notification requirements in decades. The new requirements imposed additional time and expense on merging parties, with the FTC estimating that the new form would likely take triple the amount of time to complete than the previous form. Numerous groups, including the U.S. Chamber of Commerce, sued to challenge the rule.
Client Alert | 1 min read | 01.20.26
Client Alert | 6 min read | 05.16.25
Recent Antitrust Enforcer Statements Signal New Administration’s Direction and Priorities
Client Alert | 3 min read | 02.27.25
No-Poach Not Going Anywhere: FTC Chair Announces New Labor Task Force
Insights
Cases and Precedents: Cartels: USA 2025
|11.01.24
Global Competition Review
Authored in 2023, 2024, 2025
Ashley (Lee)'s Insights
Client Alert | 3 min read | 02.13.26
In October 2024, the FTC adopted a final rule that substantially modified the HSR form, requiring new categories of information and documents. The final rule was the most significant overhaul of the HSR premerger notification requirements in decades. The new requirements imposed additional time and expense on merging parties, with the FTC estimating that the new form would likely take triple the amount of time to complete than the previous form. Numerous groups, including the U.S. Chamber of Commerce, sued to challenge the rule.
Client Alert | 1 min read | 01.20.26
Client Alert | 6 min read | 05.16.25
Recent Antitrust Enforcer Statements Signal New Administration’s Direction and Priorities
Client Alert | 3 min read | 02.27.25
No-Poach Not Going Anywhere: FTC Chair Announces New Labor Task Force




