The U.S. Supreme Court is poised to consider a landmark case that could redefine competition in the real estate industry, examining whether the National Association of Realtors (NAR) and its partners, including Zillow, used “optional” rules to stifle innovation and drive competitors like Real Estate Exchange (REX) out of business. This decision could have profound implications for future real estate transactions, potentially saving homeowners billions in commissions and setting a new precedent for antitrust enforcement against business associations.
The home selling business is undergoing what many describe as a seismic transformation. Amid these sweeping changes, the country’s largest real estate industry group, the National Association of Realtors (NAR), quietly ended a controversial “optional” rule earlier this year. This rule previously allowed major online listing sites, notably Zillow, to diminish the visibility of home sale listings from services that challenged traditional real estate agents and their entrenched fee structures.
Now, the critical question of whether NAR can evade a potentially massive, multibillion-dollar lawsuit accusing it and Zillow of using these “optional” rules to circumvent antitrust law and eliminate competitors rests with the U.S. Supreme Court. On Friday, October 17, 2025, the High Court is scheduled to consider an appeal from Real Estate Exchange (REX), whose former operators are seeking to revive their lawsuit.
The Seismic Shift in Home Selling: A Brief History
For decades, the real estate market in the U.S. has operated under a system where sellers typically pay a 6% commission, which is then split between the buyer’s and seller’s agents. This traditional model has long been a point of contention, leading to numerous antitrust challenges.
REX’s Challenge to the Status Quo
In 2015, businessman and former investment banker Jack Ryan launched Real Estate Exchange (REX) with a revolutionary goal: to disrupt the traditional real estate broker model. Ryan, a former U.S. Senate candidate in Illinois, was motivated by a personal experience where he felt his agent received a full commission despite minimal work.
REX aimed to drastically reduce the fees paid by American home sellers and buyers from the standard 6% to a more internationally aligned 2-3%. For a $450,000 home, such a reduction could translate into tens of thousands of dollars in savings. REX sought to achieve this by bypassing the Multiple Listing Services (MLS), which are largely run by NAR members, and instead listing properties directly on online platforms like Zillow and social media.
The Broader Antitrust Storm and NAR’s Settlement
Simultaneously with REX’s emergence, NAR and large U.S. brokerages faced a barrage of lawsuits challenging the commission and fee structure as monopolistic and collusive violations of federal antitrust laws. In 2024, NAR and others involved in these lawsuits reached a settlement, agreeing to pay hundreds of millions of dollars and, more significantly, to reform their fee and commission practices to allow greater flexibility for sellers.
The Heart of the Dispute: “Optional” Rules and Alleged Collusion
Despite the broader settlement, REX argues that NAR’s alleged antitrust behaviors persisted. Their lawsuit specifically targets an alleged agreement between NAR and Zillow to adhere to a “Segregation Rule.” This rule, REX claims, led Zillow to implement a two-tier listing system that buried listings from non-NAR member realty services, including REX.
According to REX, this alleged collusion resulted in an 80% decline in pageviews for REX’s listings, ultimately driving the company out of business within 18 months and costing them billions in lost opportunities. However, REX’s legal action faced setbacks in federal courts, first in Washington state and then before the San Francisco-based U.S. Ninth Circuit Court of Appeals. These courts ruled that REX failed to prove an illegal conspiracy, partly because NAR’s “Segregation Rule” was deemed “optional.”
While NAR has since repealed this “optional” rule, seemingly to align with the demands outlined in REX’s lawsuit, REX has continued its legal pursuit. REX’s attorney, Bennett Rawicki of Hilgers Graben PLLC, stated that NAR should not avoid liability for harming its competitor, and the company has asked the Supreme Court to allow its lawsuit to proceed, as detailed in its petition to the high court (SupremeCourt.gov).
Why SCOTUS Intervention is Critical
REX and its supporters believe the High Court must address this case to prevent NAR and other business associations from using similar “optional rules” to suppress competition and bypass federal antitrust laws. In their petition, REX highlights that the Supreme Court previously considered a similar question a decade ago, but that appeal failed on procedural grounds. REX contends its current case offers a robust legal “vehicle” to definitively resolve whether business associations can employ “optional rules” to further alleged illegal conspiracies that stifle innovation, harm consumers, and undermine the U.S. economy.
The urgency for Supreme Court review is amplified by the fact that different federal courts have interpreted federal law differently on this key legal question, leading to inconsistent outcomes across the country. In a supportive amicus brief filed October 14, Consumer Advocates in American Real Estate (CAARE) underscored the issue, stating that NAR’s rules created a “rigged, two-tiered system” across major online portals. This system, CAARE argued, gave prominence to NAR members’ listings while systematically downgrading innovative, non-member listings to hidden tabs rarely seen by consumers (SupremeCourt.gov).
CAARE, joined by the Antitrust Education Project, warned that allowing the Ninth Circuit ruling to stand would create a “loophole” that NAR and other professional and business associations could exploit to limit competition, leading to an “evisceration of competition.”
What This Means for Home Sellers, Buyers, and the Future of Real Estate
The Supreme Court’s decision on whether to hear REX’s appeal carries immense weight for the future of the real estate market. The implications are far-reaching:
- Increased Competition: A ruling favorable to REX could compel business associations to ensure fairer access to marketplaces, fostering a more competitive environment for new real estate service models.
- Consumer Savings: By dismantling practices that allegedly inflate fees, the decision could lead to lower commissions, saving homeowners significant amounts on transactions that total $2 trillion annually.
- Innovation and Transparency: The case could pave the way for greater innovation in how homes are bought and sold, with more transparent processes and choices for consumers.
- Precedent for Antitrust Law: The Court’s stance on “optional rules” could establish a crucial precedent for antitrust enforcement across various industries, impacting how business associations operate nationwide.
While Zillow and NAR have so far chosen not to respond to REX’s petition, the justices could still order them to do so before deciding to take up the appeal. REX, represented by attorneys Bennett Rawicki and Charles R. Flores of Flores Law PLLC, Houston, asserts that few antitrust cases have ever been more important, highlighting the profound economic and competitive stakes involved.
