O’Melveny Expands Its Global Antitrust Team with Leading Trial Lawyers Diana Aguilar & Lauren Weinstein
March 2, 2026
FOR IMMEDIATE RELEASE
NEW YORK—March 2, 2026—O’Melveny announced today that leading antitrust trial lawyers Diana Aguilar and Lauren Weinstein have joined the firm’s San Francisco and Washington, DC offices as partners in the Antitrust & Competition Practice Group, bolstering the firm’s antitrust capabilities and expanding its worldwide roster of top-tier practitioners.
Aguilar, who joins O’Melveny from the US Department of Justice, and Weinstein, who arrives from boutique litigation firm MoloLamken, are recognized as emerging leaders in the antitrust and competition arena. Together, they bring more than 25 years of experience to O’Melveny handling high-stakes litigation, investigations, and enforcement matters. They will represent clients across a broad spectrum of industries, such as technology, financial services, transportation, media and entertainment, and energy.
The addition of Aguilar and Weinstein accelerates O’Melveny’s continued strategic growth. With their arrival, 46 lateral partners have joined the firm since 2023, including 19 litigation partners. And Aguilar and Weinstein are two of five partners to join O’Melveny’s Antitrust & Competition Practice Group in just the past year—following the 2025 arrivals of Brussels partners Stéphane Frank and Vanessa Turner and the promotion earlier this year of Washington, DC partner Brian Quinn.
“It is a pleasure to welcome Diana and Lauren to our firm as we continue to expand our talented and award-winning Antitrust team,” said O’Melveny chair Bradley J. Butwin. “Both Diana and Lauren are impressive trial lawyers, with sharp technical abilities and extensive experience at the highest levels that will immediately benefit our clients. We are delighted to welcome them aboard.”
“I’m excited to join O’Melveny’s San Francisco office and to work alongside such a remarkable team of lawyers,” said Aguilar. “O’Melveny is renowned for excellence and for a deep commitment to client service. I’m thrilled to call the firm ‘home’ as I reenter private practice.”
“Joining O’Melveny’s Washington, DC office was an easy decision for me,” added Weinstein. “Not only is the firm an antitrust powerhouse, but its culture of collegiality and collaboration is truly special. I’m confident that O’Melveny will be the perfect fit for me and my clients.”
About the Partners
Based in San Francisco, Diana Aguilar comes to O’Melveny from the San Francisco office of the US Department of Justice’s Antitrust Division. Throughout her DOJ tenure, Aguilar earned a reputation as a formidable trial lawyer and strong courtroom advocate. She has handled a wide range of complex litigation—including high-profile civil matters involving multinational technology companies and the digital markets. She is a recipient of US Attorney General’s Award for Distinguished Service, the DOJ’s second-highest award, and the Assistant Attorney General’s Award of Distinction. Before entering public service, Aguilar worked as an associate at Latham & Watkins and focused her practice on antitrust matters and commercial litigation, including civil antitrust trials, merger control, and government investigations.
Aguilar earned her J.D. cum laude from Cornell Law School, her M.A. from the University of California, Santa Barbara, and her B.S. from the University of California, San Diego.
Based in Washington, DC, Lauren Weinstein is an accomplished trial lawyer with unique experience representing both defendants and plaintiffs in bet-the-company antitrust litigation in state and federal courts, as well as in appellate matters going all the way to the US Supreme Court. She is ranked among the nation’s premier antitrust practitioners by Chambers USA, and has been recognized as a “Rising Star” by The Legal 500 US and a “Top Lawyer Under 40” by the Hispanic National Bar Association. Weinstein comes to O’Melveny from the Washington, DC office of MoloLamken, where she was a litigation partner. Earlier in her career, she served as a clerk to the Hon. M. Margaret McKeown of the US Court of Appeals for the Ninth Circuit, and to the Hon. John G. Koeltl of the US District Court for the Southern District of New York.
Weinstein earned her J.D. from Harvard Law School and her B.A. magna cum laude from Northwestern University.
About O’Melveny
It’s more than what you do: it’s how you do it. Across sectors and borders, in board rooms and courtrooms, we measure our success by yours. And in our interactions, we commit to making your O’Melveny experience as satisfying as the outcomes we help you achieve. Our greatest accomplishment is ensuring that you never have to choose between premier lawyering and exceptional service. So, tell us. What do you want to achieve? Visit us at www.omm.com; learn more in our firm at-a-glance; and find us on LinkedIn, Facebook, Instagram, and YouTube.
Contact:
Brandon Jacobsen
O’Melveny & Myers LLP
+1 213 430 8024
bjacobsen@omm.com
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