Ashley (Lee) McMahon
Counsel | She/Her/Hers
Overview
As an experienced antitrust attorney with a primary focus on defending high-stakes Sherman Act, Section 1 conspiracy allegations, Ashley (“Lee”) McMahon leverages her specialized expertise to navigate complex litigation and government investigations. Her experience spans class action litigations and private party lawsuits, particularly in “no-poach” cases, and follows a proactive approach to emerging regulatory challenges. Clients, ranging from healthcare systems to global manufacturing giants, benefit from Lee’s strategic insight and collaborative solutions.
Career & Education
- University of Virginia School of Law, J.D., 2016
- Connecticut College, B.A., magna cum laude, 2009
- District of Columbia
- Virginia
- U.S. District Court for the District of Columbia
- U.S. District Court for the Eastern District of Virginia
Professional Activities and Memberships
- American Bar Association
- Antitrust Section
- Washington Council of Lawyers
- American Bar Association
Ashley (Lee)'s Insights
Client Alert | 1 min read | 03.20.26
HSR Form Rollback: What Dealmakers Need to Know Now
On March 19, 2026, a U.S. District Court for the Fifth Circuit panel denied the Federal Trade Commission’s (FTC) emergency motion for a stay pending appeal of a district court’s order that vacated the FTC’s 2024 overhaul of the HSR premerger notification form.
Client Alert | 3 min read | 02.13.26
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
Representative Matters
- Represented an aerospace and defense company in a no-poach class action litigation alleging an agreement not to hire suppliers’ aerospace engineers and other skilled workers, which stemmed from a grand jury indictment.
- Represented a Naval shipbuilder in a no-poach class action litigation alleging a decades-long, industry-wide agreement not to poach competitor naval engineering employees.
- Represented a major regional health care provider in a no-poach class action litigation alleging an agreement not to solicit competitors’ healthcare workers.
- Represented client in a grand jury investigation alleging no-poach agreements.
- Represented a major health insurance payor accused of price-fixing through the use of algorithmic pricing software.
- Represented a toy manufacturing company accused of group boycott by withdrawing advertising from a social media platform.
- 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 price-fixing cartel allegations.
- 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.
- Represented a multinational telecommunications company in the premerger filing and Second Request investigation 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.
Ashley (Lee)'s Insights
Client Alert | 1 min read | 03.20.26
HSR Form Rollback: What Dealmakers Need to Know Now
On March 19, 2026, a U.S. District Court for the Fifth Circuit panel denied the Federal Trade Commission’s (FTC) emergency motion for a stay pending appeal of a district court’s order that vacated the FTC’s 2024 overhaul of the HSR premerger notification form.
Client Alert | 3 min read | 02.13.26
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
Insights
Cases and Precedents: Cartels: USA 2025
|11.01.24
Global Competition Review
Authored in 2023, 2024, 2025
Ashley (Lee)'s Insights
Client Alert | 1 min read | 03.20.26
HSR Form Rollback: What Dealmakers Need to Know Now
On March 19, 2026, a U.S. District Court for the Fifth Circuit panel denied the Federal Trade Commission’s (FTC) emergency motion for a stay pending appeal of a district court’s order that vacated the FTC’s 2024 overhaul of the HSR premerger notification form.
Client Alert | 3 min read | 02.13.26
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




