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Ann O'Brien

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Ann O'Brien is a partner and co-leader of the firm's Antitrust and Competition Practice Group. She also leads the firm’s Criminal Antitrust and Cartels team. Ann is based in the firm's Washington, D.C. office.

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On October 6, 2025, California Governor Gavin Newsom signed AB325, a law targeting the use and distribution of certain algorithmic pricing tools. This law is part of a larger legislative trend to try to rein in algorithmic pricing. But while other bills have focused narrowly on the rental housing market and languished in state legislatures, California’s bill targets pricing algorithms in all markets and will take effect in 2026. However, a violation of the new law requires a conspiracy or price coercion, so as a practical matter, it may not extend the range of violations already encompassed by the Cartwright Act.Continue Reading California Passes Broad Limits on “Common Pricing Algorithms”

On Tuesday, July 8, the DOJ Antitrust Division announced a first-of-its-kind Antitrust Whistleblower Rewards Program (the “Program”). But the Program’s fine print suggests it may not be as lucrative for whistleblowers as it appears at first blush.Continue Reading New DOJ Antitrust Postal Whistleblower Rewards Program: A Look Under the Shiny Hood

As we predicted before the inauguration, Trump 2.0 antitrust enforcers have shown continued support for the pro-worker, anti-tech antitrust agenda that has permeated recent antitrust enforcement through the last two administration changes. This time around, President Trump appointed competition agency leaders in Chair Ferguson at the Federal Trade Commission (FTC) and AAG Slater at the Department of Justice Antitrust Division (DOJ) who identify with a brand of conservative populism coalescing around many of the same policies and priorities as Biden-appointed competition leaders like FTC Chair Lina Khan. For example, since the inauguration, antitrust agencies under their leadership have forged on with antitrust cases against Big Tech, backed the Biden-era revisions to the merger and labor guidelines, and doubled down on efforts to use antitrust laws to protect American workers.Continue Reading Red Tape Rollback: DOJ’s Anticompetitive Regulations Task Force

Four days before President Trump took office, the Department of Justice (“DOJ”) and Federal Trade Commission (“FTC”) (together, “the Agencies”) under the Biden administration released their “Antitrust Guidelines for Business Activities Affecting Workers” (“The Guidelines”). These Guidelines replace and expand upon antitrust guidance for HR professionals that the Obama administration issued in 2016. The new Guidelines aim to clarify how the DOJ and FTC “identify and assess business practices affecting workers that may violate the antitrust laws.”Continue Reading DOJ and FTC Issue Antitrust Guidelines for Business Activities Affecting Workers

What antitrust enforcement will look like during a second Trump administration is, like antitrust law, complicated. Notions that Republicans are pro-business and therefore will take a laissez-faire approach to antitrust enforcement are outdated and simplistic. During Trump’s first term, antitrust enforcement was far from moribund, blending traditional Republican preferences for deregulation with a populist skepticism toward Big Tech and market concentration generally. This anomalistic meeting of progressive Democrats and conservative Republicans in the antitrust space even garnered a mash-up moniker – the “Khanservaties” – a group of conservative Republicans including Missouri Senator Josh Hawley and erstwhile Attorney General nominee and former Florida Representative Matt Gaetz, who praised Biden-appointed Federal Trade Commission (FTC) Chair Lina Khan. Vice President-elect J.D. Vance also provided backhanded praise for Khan, stating, “I look at Lina Khan as one of the few people in the Biden administration that I think is doing a pretty good job.” Continue Reading Antitrust During Trump 2.0: It’s Complicated

The Department of Justice’s Antitrust Division (“Antitrust Division”) recently updated its Evaluation of Corporate Compliance Programs in Criminal Antitrust Investigations guidance document (“Antitrust Compliance Guidance”). Corporate counsel and compliance officers should seriously consider these updates when crafting and implementing an antitrust compliance program.Continue Reading Key Takeaways from the DOJ Antitrust Division’s Updated Compliance Guidance: It’s Not Just Criminal Anymore

Republican and Democrat candidates alike have promised along the campaign trail that they will work to address the costs of everyday essentials for American consumers, particularly for food. One of the centerpieces of the Harris-Walz campaign is enacting “the first-ever federal ban on price gouging on food and groceries”[1] and the Trump-Vance campaign has decried the rising price of eggs as a byproduct of the Biden Administration’s economic policies.[2] Candidates’ focus on the checkout counter is unsurprising given reports that rising prices are one of voters’ top concerns this election cycle. And while the Consumer Price Index indicates that the current rate of inflation is 2.4% and on a downward trend,[3] certain data show that the price for food has increased by an average of 25% across urban cities in the United States since 2020.[4]Continue Reading Campaign Promises to Address Rising Prices at the Grocery Store Signal Stronger Price Gouging Investigations, Enforcement Actions, and Prohibitions to Come

Yesterday, August 28th, the Federal Trade Commission (the “FTC”) and the Department of Justice Antitrust Division (the “DOJ”) (the “Antitrust Agencies”), together with the Department of Labor (the “DOL”) and National Labor Relations Board (the “NLRB”), signed a new agreement (the Memorandum of Understanding or “MOU”) that seeks to enhance the ability of the FTC and DOJ to investigate the impact of mergers and acquisitions on labor markets.Continue Reading U.S. Federal Antitrust Agencies Announce Cooperation Initiative with Labor Agencies in Merger Review

On July 3, 2024, Judge Ada Brown of the U.S. District Court for the Northern District of Texas entered a limited, preliminary injunction barring the Federal Trade Commission (“FTC”) from enforcing its controversial Final Rule (“Rule”) which purports to ban almost all non-compete agreements. Importantly, Judge Brown’s preliminary order only enjoined enforcement of the Final Rule against the named plaintiffs who opposed it. On August 20, 2024 – just two weeks before the Rule’s effective date – Judge Brown greatly expanded the scope of her initial ruling by granting summary judgment for the plaintiffs and ordering the Rule be completely “set aside” and “not be enforced or otherwise take effect on September 4, 2024[.]” Judge Brown’s order may be the fatal blow for the Rule, and should end a months-long saga of uncertainty for employers.Continue Reading Final Word on Final Rule? Texas District Court Eviscerates FTC’s Non-Compete Ban

On July 3, District Judge Ada Brown of the Northern District of Texas issued an order enjoining the Federal Trade Commission (“FTC”) from enforcing its “Final Rule” against plaintiffs Ryan, LLC (“Ryan”) and the U.S. Chamber of Commerce (the “Chamber”). If implemented, the Final Rule would effectively render nearly all non-compete agreements unlawful. Accordingly, this opinion was one of the most highly anticipated judicial decisions in antitrust and labor and employment law in recent memory.Continue Reading Not So “Final”? Texas Federal Court Enjoins Enforcement of FTC’s Noncompete Ban, Leaving Future of Commission’s Rule in Doubt

The health care industry has been a particular focus of antitrust concern in recent years, including recent policy initiatives, private equity warnings, and enforcement actions from both the Department of Justice (DOJ) and Federal Trade Commission (FTC). The new Task Force on Health Care Monopolies and Collusion (HCMC), announced this month by the DOJ, is the latest example of antitrust scrutiny on the industry.Continue Reading New DOJ Health Care Task Force Portends Continued Aggressive Antitrust Enforcement