A Northern California federal court has emerged as the preeminent tribunal for hot-button antitrust cases, with an Oakland judge set to soon decide whether to block one of the largest Hollywood mergers in history.

Three lawsuits challenging Paramount Skydance Corp.‘s $110 billion purchase of Warner Bros. Discovery Inc., including a case spearheaded by the California Attorney General Rob Bonta (D) along with 11 other states, are now before Judge Araceli Martínez-Olguín.

The state AGs, who sued just a week ago, have asked Martínez-Olguín, who sits in the US District Court for the Northern District of California, to temporarily halt the acquisition plans while the case can continue to play out. The states argue the merger, which combines two of the five largest movie studios, will harm competition in the film and TV industry.

At a Friday hearing, Martínez-Olguín said she will issue a ruling on their request by July 22.

Martínez-Olguín’s federal trial court which covers San Francisco, Silicon Valley, and the rest of the Bay Area has become the pivotal venue in the world of corporate power, thanks in large part to a deep bench of knowledgeable jurists, an experienced antitrust bar, and a booming tech industry.

“It’s a bit like Delaware with certain kinds of corporate litigation,” said Joshua Davis, head of the San Francisco office of Berger Montague PC. “They have courts that are very familiar with how certain kinds of litigation work.”

The Northern District of California had the most consolidated antitrust class actions of any district in the country between 2009 and 2025, according to a study Davis co-authored earlier this year. The next most was the Manhattan-based Southern District of New York.

Judge Know-How

The Paramount cases have been assigned to one of the district’s newest judges. Martínez-Olguín, appointed in 2023, is among a group of the Northern District of California judges nominated by President Joe Biden.

She doesn’t have the same corporate law background as some of her older colleagues, having mostly worked in immigration and civil rights law prior to her appointment.

But in just a few years, Martínez-Olguín has overseen her fair share of high-stakes corporate litigation.

The judge presided over a three-week trial last year in an antitrust case against the company Intuitive Surgical Inc., maker of the da Vinci robotic surgical system, where she ultimately tossed out the claims before the jury would need to reach a verdict. A federal appeals court panel at oral arguments last month appeared open to reversing her decision.

Long History

The increasing power of the country’s Northern California-based tech industry has drawn countless high-profile antitrust cases to the Bay Area court, where judges are tasked with wading into the technical and specialized field of antitrust law.

Epic Games Inc., the video game conglomerate behind Fortnite, took on major cases against Apple Inc. and Google LLC in the Northern District of California. And even before the most recent tech boom, the Northern District of California judges saw cases involving anticompetitive practices in the market for LCD screens and no-poach agreements among high-tech employees.

“The private antitrust bar in San Francisco has just been very strong for a long time,” said Brendan Glackin, chair of the antitrust practice of the San Francisco-based Lieff Cabraser Heimann & Bernstein LLP. “On the plaintiff side there were a few attorneys who were real pioneers of the practice at a time when not too many others were focused on it.”

That history goes back decades. San Francisco’s former mayor Joseph Alioto (D), who governed from 1968 to 1976, built up a formidable private antitrust practice in the 1960s where he took cases involving Walt Disney and the NFL.

Lots of activity comes in the form of cases brought by law firms following litigation by the San Francisco office of the US Department of Justice’s antitrust division, which is among the larger and most active antitrust offices.

Venue Factors

That Paramount and Warner Bros. have headquarters in Los Angeles and New York doesn’t play a major factor in venue selection. Federal antitrust laws generally give broad flexibility in allowing plaintiffs to sue in any district where a corporation does business.

One key explanation for the Northern California focus is the “first to file rule” that gives priority to those who are first to the courthouse. Months before the state AGs sued, a group of consumer plaintiffs filed a complaint in April in the Northern District of California to block the deal, which was assigned to Martínez-Olguín.

The state AGs’ complaint along with a similar lawsuit from the Writers Guild of America both cited that first case and were moved to Martínez-Olguín’s docket at their request.

But a final factor in venue selection may just be the California AG’s familiarity with the court.

“I think they view it as a friendly district where they can get not just a fair shake, but maybe even a favorable shake,” said Kevin Frankel, who leads the state AGs practice at Benesch Law.