Nathaniel Regenold is an associate in Cohen Milstein’s Antitrust practice. He represents a broad range of individuals and businesses in civil litigation, with a focus on multi-district class actions and antitrust litigation.
Prior to joining Cohen Milstein, Nathaniel clerked for the Honorable Paul L. Friedman of the United States District Court for the District of Columbia and for the Honorable Jane Kelly of the United States Court of Appeals for the Eighth Circuit. Before that, he was a litigation associate at a highly regarded global law firm where he focused on antitrust and other civil litigation matters.
During law school, Nathaniel was the vice president of the Asian Pacific American Law Students Association, an executive editor of the Georgetown Law Journal, and a member of the Order of the Coif.
Prior to law school, Nathaniel served as a Peace Corps Volunteer in Liberia, where he taught high school math and science, and worked as a legal assistant with the Florence Immigrant and Refugee Rights Project in his home state of Arizona, providing legal assistance to detained adults facing threat of deportation.
Nathaniel is proficient in Spanish.
- Co-Chair, Amicus Committee, Committee to Support Antitrust Laws (COSAL) – 2024-2025Â
- New York
- District of Columbia
- Georgetown University Law Center, J.D., magna cum laude, 2018
- Washington University in St. Louis, B.A., with College Honors, 2011
- Law Clerk, the Hon. Paul L. Friedman, U.S. District Court, District of Columbia (2021 – 2022)
- Law Clerk, the Hon. Jane Kelly, U.S. Court of Appeals for the Eighth Circuit (2020 – 2021)
Current Cases
Hartford HealthCare Litigation
Estuary Transit District v. Hartford HealthCare Corporation (D. Conn.): Cohen Milstein, as court-appointed Co-Lead Counsel, is representing plaintiffs in a putative antitrust class action against Hartford HealthCare, one of Connecticut's dominant hospital providers for unlawfully monopolizing, restraining trade, and engaging in price fixing in the Connecticut inpatient and outpatient health services markets.
Pacific Steel Group v. Commercial Metals Company, et al.
Pacific Steel Group v. Commercial Metals Company (N.D. Cal.): Cohen Milstein represented Pacific Steel Group (PSG), a steel rebar fabricator, in challenging an exclusionary micro mill contract initiated by Commercial Metals Company (CMC), one of the world’s largest steel companies. The alleged purpose of the contract was to assert CMC's monopoly an prevent PSG from competing in the Southern California market. On November 5, 2024, after a two-week jury trial, a federal jury issued a $110 million verdict against CMC.
In re Seroquel XR Antitrust Litigation
In re Seroquel XR Antitrust Litigation (D. Del.): Plaintiffs allege that Defendant AstraZeneca Pharmaceuticals LP struck deals with generic drug manufacturers Handa Pharmaceuticals LLC, Par Pharmaceutical Inc. and Accord Pharmaceuticals Inc., inducing the generics to delay launching generic versions of Seroquel XR, AstraZeneca's prescription drug treatment for schizophrenia, bipolar disorder and depression, for five years in exchange for AstraZeneca committing to delay the launch of its own authorized generic.
In re Lipitor Antitrust Litigation
In re Lipitor Antitrust Litigation (D.N.J.): Plaintiffs allege that Pfizer, the manufacturer of the cholesterol drug Lipitor, the best-selling drug in pharmaceutical history, conspired with Ranbaxy, the generic manufacturer, to delay its introduction of a generic Lipitor product. On October 1, 2024, the Court granted final approval of a $35 million settlement against Pfizer for its role in the alleged anticompetitive scheme. Litigation against Ranbaxy is ongoing. Cohen Milstein is Co-Lead Counsel to the End-Payor Plaintiffs class.
Past Cases
Treasuries Antitrust Litigation
In re: Treasuries Securities Antitrust Litigation (S.D.N.Y.): Cohen Milstein was Co-Lead Counsel in this ground-breaking antitrust and Commodity Exchange Act class action alleging many of the nation’s biggest banks manipulated the $13 trillion market for U.S. Treasuries and related instruments. Cohen Milstein and co-counsel developed the case independently, without the assistance or benefit of any preceding government investigation or enforcement action.
Amicus Briefs
LabCorp. v. Davis
On April 7, 2025, Cohen Milstein filed an amicus brief on behalf of distinguished federal jurisdiction scholars in support of respondents in the Supreme Court case Laboratory Corporation of America Holdings, D/B/A Labcorp v. Luke Davis, et al. (24-304). Respondents, individuals who are legally blind, brought a class action lawsuit against Labcorp in 2020. They […]
November 5, 2024
Texas Rebar Giant CMC Hit With $110M Antitrust Verdict
A California federal jury hit Commercial Metals Co. with a $110 million antitrust verdict on Tuesday, finding the Texas rebar giant liable for multiple antitrust violations and awarding Pacific Steel Group millions of dollars in lost profits and other damages.
In the News | Law360
October 28, 2024
Rebar Giant Pushed ‘Hands-Off Calif.’ Deal, Antitrust Jury Told
Commercial Metals Co.'s ex-CEO conceded during a federal antitrust jury trial Monday that the Texas rebar giant pushed micromill-maker Danieli Corp. into a "hands-off California" exclusivity provision barring Danieli from developing most Golden State rival mills days after discovering Pacific Steel Group was planning to build a mill in Southern California with Danieli.
In the News | Law360