Eimer Stahl's attorneys have decades of experience in litigating high-stakes civil and criminal antitrust matters, guiding clients through government investigations and transaction pre-clearance review, and offering creative solutions to the most complex antitrust issues. Our antitrust practice is global in scope, and we have successfully defended leading national and international corporations in significant private class action litigation in a wide range of industries, including the energy, electronics, technology, agriculture, insurance, and manufacturing sectors. We also have defended corporate and individual clients in numerous grand jury antitrust investigations and before state and federal enforcement agencies. Eimer Stahl combines this unparalleled experience with a uniquely innovative and strategic approach to antitrust litigation, consistently striving to deliver the best results to our clients in their most challenging endeavors.


Defended leading technology company and its music streaming service in an antitrust and unfair trade practices lawsuit related to performance rights of musical works.

Represented Korean semiconductor supplier and its American subsidiary against state and federal antitrust claims alleged by putative classes of direct and indirect purchasers of DRAM, a type of semiconductor memory.

Defending agriculture cooperatives in antitrust complaints brought on behalf of putative classes of purchasers of seeds and crop-protection chemicals such as fungicides, herbicides, and insecticides used by farmers.

Representing four of the largest rail shippers in the United States in antitrust litigation to recover overpayments due to a price-fixing conspiracy.

Representing health insurance provider in action to recover overcharges in a case alleging price inflation of a pharmaceutical through anti-competitive conduct and fraud.

Served as lead trial counsel for interior molded door manufacturer in multiple antitrust class action lawsuits.

Representing major auto insurance company in antitrust actions alleging the insurers conspired to suppress the rates paid for repairs in the multi-billion-dollar collision repair industry and boycott shops with which they have no relationships.

Representing leading chemical company in direct and indirect class and direct action antitrust lawsuits against manufacturers of lithium ion battery cells and related products.

Defending major technology company in direct purchaser and indirect purchaser class action antitrust complaints alleging price-fixing of optical disk drives brought by numerous businesses and consumers in both class and individual actions.

Represented international technology corporation and its US subsidiary in a federal antitrust class action involving anti-poaching agreement allegations. 

Represented the world’s largest customer brand dairy product company in a multidistrict class action alleging an antitrust and commodity manipulation conspiracy.

Representing entities of leading technology company in current and threatened antitrust litigation concerning alleged price-fixing of cathode ray tubes.

Routinely represent corporate and individual clients in criminal and civil investigations and proceedings initiated by the Department of Justice, Federal Trade Commission, Securities and Exchange Commission, and state attorneys general.

Extensive experience conducting antitrust compliance audits and developing antitrust compliance programs, including forensic audits, risk assessments, policy drafting, and employee training, across a variety of industries.


Eimer Stahl and our lawyers are consistently recognized as national leaders in antitrust law.

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Chambers & Partners

  • Since 2003, Eimer Stahl's Antitrust practice, which is currently ranked Band 1 for Illinois: Antitrust, has earned kudos from Chambers USA, which has commended it for its "outstanding antitrust partners" (2014), the "high caliber of its trial attorneys" (2012), and its "widely respected antitrust practice" (2008).
  • Eimer Stahl is a "highly-regarded boutique firm specializing in antitrust law and excelling at litigation…and often noted for its creative solutions" (2022) and is continually regarded as "a tremendously trusted and valued legal partner" (2020).
  • Chambers has also noted that "the antitrust group is known for its emphasis on litigation, and is also active in M&A and merger matters; peers say its compact size does not hold it back" (2009). "Clients regularly turn to it for high-stakes class action antitrust litigation" (2009) and appreciate the firm's “very sophisticated expertise in both traditional and emerging antitrust issues” (2022).
  • The firm ”is very sophisticated, knowledgeable and talented” (2015), is "routinely sought to handle complex and high-value antitrust disputes" (2013), and musters "an impressive team with a talented group of experienced antitrust practitioners at the helm, who really know how to get the job done" (2011).
  • Clients praise the firm's "intellectual horsepower." "They are very smart people and very experienced in antitrust" (2018).
  • Widely acknowledged to be one of the best antitrust lawyers in the nation, founding partner Nate Eimer is one of two antitrust lawyers in Illinois and one of three antitrust lawyers in the country to receive a "Star" rating from Chambers USA every year since 2018. Star individuals are "among the crème de la crème – the standard by which others are judged. . . Their reputation is cultivated through a long history of excellence," says Chambers. "Additionally, they have managed to change the legal landscape in dramatic ways" (2014).
  • "A very strong antitrust boutique firm" (2012), with additional attorneys who are ranked Band 3 and Band 4, such as Michael McCluggage and Vanessa Jacobsen. 

THE Legal 500 United States

  • Eimer Stahl is proud to be included in The Legal 500 United States Civil Litigation/Class Action: Defense category, with one client stating, “The Eimer Stahl team has unparalleled expertise in antitrust matters, coupled with outstanding litigation skills. They are a go-to for ‘bet-the-company’ litigation” (2022).
  • Industry peers have stated, "they [Eimer Stahl] approach and tackle issues strategically and are able to provide very practical legal advice" (2021).
  • Clients have praised our attorneys, noting "Nate Eimer and Vanessa Jacobsen are both very passionate about their work and provide undivided attention to clients’ concerns and thoughts at all times. Both are the strategic brain within the firm orchestrating their members to top-notch levels" (2021). "The combined experience of the team is unmatched" (2022).

U.S. News & World Report - Best Lawyers

  • U.S. News & World Report – Best Lawyers "Best Law Firms" ranks the firm’s Antitrust Law and Antitrust Litigation practices among the best in Chicago – and in the nation.
  • Listed for Antitrust Law and Antitrust Litigation, Nate Eimer received praise for his "knowledgeable and responsive” and "coolheaded and practical" approach. Recognized by Best Lawyers every year since 2006, Nate was named a "Lawyer of the Year" for 2020, 2018, 2014, 2013, and 2011.
  • Co-founder David Stahl, who was also listed in the Best Lawyers 2015 edition for Antitrust Law, is described by a client as a "gifted communicator" with "tremendous integrity and terrific presence in the courtroom."

Leading Lawyers

  • Nate Eimer was named the #1 Antitrust Lawyer in Chicago in 2014 by Leading Lawyers and was recognized among the top 10 antitrust lawyers in Illinois from 2014-2019. Eimer Stahl antitrust practitioners Brent Austin, Nate Eimer, Vanessa Jacobsen, and Mike McCluggage are consistently recognized as Illinois Leading Lawyers. Dan Birk has also been featured as an Illinois Emerging Lawyer.


Representative Clients

Representative Clients

Apple Inc.
CITGO Petroleum Corporation
CNA Financial Corporation
The Dow Chemical Company 
Gerdau Ameristeel Corporation
Humana, Inc.
International Paper Company
Land O’Lakes, Inc.
LG Chem Ltd.
LG Display Co., Ltd.
LG Electronics, Inc.
LG Energy Solution, Ltd.
Masonite Corporation
Schreiber Foods, Inc.
SK hynix, Inc.
State Farm Mutual Automobile Insurance Company

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