Well, that didn’t take long. Just days after I wrote about the increasingly aggressive fight between California Regional Multiple Listing Service, better known as CRMLS, and Compass over private listings and MLS cooperation, CRMLS has taken the next step. CRMLS filed a federal lawsuit against Compass on October 5, one day before the deadline Compass had given CRMLS to change its rules or face an antitrust lawsuit. Instead of waiting for Compass to sue, CRMLS went first.
The case was filed in the United States District Court for the Southern District of New York, where Compass is headquartered, under case number 1:26-cv-08796. CRMLS is asking the court to declare that its cooperation rules, specifically Rules 7.9 and 7.9.1, are lawful under both the federal Sherman Antitrust Act and California’s Cartwright Act. CRMLS is also asking for a permanent injunction preventing Compass from bringing the threatened antitrust claims against CRMLS based upon those rules.
That changes this dispute in a pretty significant way. Compass had been telling CRMLS, and apparently other MLS organizations as well, that they needed to stop penalizing agents who publicly market office exclusive listings while keeping those listings out of the MLS. Compass set an October 6 deadline and made it clear litigation would follow if the MLS organizations did not comply. CRMLS essentially responded by saying that if the legality of these rules is going to be decided in federal court, there is no reason to wait for Compass to decide when and how that happens.
I wrote about the underlying dispute recently in What If the Home You Want Is for Sale, but Your Agent Can’t Show It? My view has not changed. I think there is an important difference between a seller choosing privacy and a brokerage publicly marketing a property while withholding it from the cooperative marketplace used by competing brokers and their buyers. A seller who genuinely wants privacy should certainly have that option. But once the property is being openly marketed to the public, I have a hard time accepting the argument that preventing competing buyer agents from having equal access somehow promotes competition.
The lawsuit makes that issue much more concrete. CRMLS argues that the MLS is a cooperative marketplace in which brokers contribute their listings and receive access to the listings contributed by other brokers. Its position is that Compass wants the benefits of that cooperative marketplace, including access to everyone else’s listing inventory and data, while maintaining the ability to publicly market some of its own listings outside that cooperative. Compass sees the issue differently and argues that sellers should be able to choose how and where their properties are marketed without their agents being fined by an MLS.
Those competing arguments are now moving out of demand letters, conference speeches and public statements and into an actual federal courtroom. And I think that is ultimately a good thing. Compass has made a serious antitrust accusation. CRMLS has made an equally serious argument that Compass’s proposed model would undermine cooperation and give large brokerages an incentive to control listing inventory for their own competitive advantage. If the parties are this far apart, getting a court to address the legal issues may be better than allowing the industry to operate indefinitely under threats of litigation.
There is another interesting piece of the complaint that deserves attention. According to CRMLS, it had more than 271,000 listings enter its system in 2025 and issued only 89 fines for violations of Rule 7.9. CRMLS says only eight of those fines involved Compass agents. If those numbers hold up, they certainly complicate any suggestion that this is simply an MLS creating a rule to punish Compass. The larger fight appears to be about what participation in an MLS cooperative actually requires and whether a brokerage can participate in the cooperative while selectively withholding publicly marketed inventory from it.
The lawsuit also tells us something about CRMLS’s strategy. This is not, at least at this stage, a lawsuit seeking damages based upon all of the possible claims CRMLS raised in its earlier response to Compass. The complaint presently focuses on obtaining declarations that the cooperation rules are lawful and stopping Compass from pursuing the threatened antitrust claims against those rules. That makes this very much a fight over the legality of the rules themselves.
I think CRMLS made the right move by going first. Compass publicly threatened litigation, gave CRMLS a deadline and said it was prepared to spend millions of dollars pursuing these cases. If CRMLS genuinely believes its rules are lawful and necessary to preserve the cooperative MLS model, simply waiting around to become a defendant would not accomplish much. Filing in New York, in Compass’s own backyard, also makes it difficult to argue that CRMLS went shopping for some especially friendly local forum.
More importantly, the consumer issue I raised before has not gone away. Sellers absolutely deserve choices in how they market their homes. Buyers deserve choices too, including the ability to choose their own real estate professional without discovering that certain publicly marketed homes are effectively available only through the brokerage controlling the listing. Competition should be about who provides the best representation, service, knowledge and value, not about which brokerage can accumulate the largest private inventory of homes and use access to those homes as leverage.
This case could become much more important than a disagreement between one California MLS and one brokerage company. Compass has made clear that its concerns extend beyond CRMLS, and other MLS organizations are watching closely. If Compass ultimately succeeds in establishing that these cooperation rules violate antitrust law, the effects could reach MLS systems across the country. If CRMLS prevails, the decision could provide significant legal support for the idea that brokers who participate in an MLS cooperative can be required to cooperate when they publicly market properties.
Either way, we have now moved beyond the question of whether Compass and CRMLS were actually going to fight this out in court. They are. And considering how much of the residential real estate business depends upon the concept that competing brokers share listing information and cooperate with one another, this is a lawsuit every broker, agent and MLS organization in the country should be watching.
