A New Chapter in the MLS Debate
California Regional Multiple Listing Service, Inc., v. Compass, Inc.
The Council of Multiple Listing Services (“CMLS”) held its 2026 national conference in Fort Lauderdale from September 29, 2026, through October 1, 2026. In its complaint, CRMLS noted that Compass CEO Robert Reffkin told conference attendees that Compass intended to sue MLSs that continued to penalize its agents over the public marketing of office exclusive listings withheld from the MLS if the MLSs did not change course by October 6, 2026.
On October 5, 2026, one day before the reported deadline, the California Regional Multiple Listing Service (“CRMLS”) filed suit in the United States District Court for the Southern District of New York, seeking declaratory and injunctive relief. In practical terms, CRMLS wants a ruling that its cooperation rules are lawful, including under federal and state antitrust law. It also seeks injunctive relief relating to Compass’s threatened challenges to those rules.
The outcome of this lawsuit could be significant to the real estate space as it brings a familiar industry debate into court: when a broker publicly markets an exclusive listing that has not been submitted to the MLS, should the broker also have to submit it to the MLS for cooperation with other participants? The answer matters beyond California. MLS policies and brokerage practices vary, but the questions raised by this dispute are relevant to conversations in Pennsylvania and elsewhere.
It is important to understand a complaint gives readers just the perspective of the party who filed it; any response that Compass files, along with any judicial rulings, must be considered separately. A complaint does, however, show how CRMLS framed its position.
In its complaint, CRMLS characterizes Compass’s demands as an effort “to bully the real estate industry into abandoning rules designed to promote transparency, broad consumer access, and fair competition among brokers.”i CRMLS argues that a brokerage should not benefit from other participants’ shared listing information while keeping some of its own publicly marketed listings outside the same cooperative system. CRMLS argues this gives Compass agents an unfair information advantage because its agents have access to a substantial amount of data from their own listings, to which other cooperating brokers do not have access.
An MLS, at its core, is a system through which participating brokers share listing information and cooperate in bringing buyers and sellers together. CRMLS offers a more expansive description of the MLS’s purposes in its complaint as a “network of real estate professionals (including agents, appraisers, and other subscribers) that agree to cooperate with each other by following the reasonable rules of the cooperative to timely and comprehensively share all the details and access to properties that are for sale or rent, including closing transactional information resulting in an efficient, fair, and equitable marketplace to benefit their clients.”ii
In 2019, NAR implemented its Clear Cooperation Policy that states, “Within one (1) business day of marketing a property to the public, the listing broker must submit the listing to the MLS for cooperation with other MLS participants.”iii CRMLS describes its corresponding rule this way: “Within one (1) business day of marketing or advertising residential real property to any member of the public for sale which contains one to four units, … the listing broker must submit the property into the MLS for cooperation with other CRMLS participants.”iv The operative question is what counts as public marketing and what MLS rules governing submission for cooperation require; submission should not be conflated with unrestricted public display.
The CRMLS Cooperation Rule affects exclusive listing agreements or exclusive right to sell agreements. CRMLS also points to non-exclusive listing arrangements as another alternative to provide sellers with an option to market their property without entering it into the MLS. This option allows sellers and their listing agents to publicly market the seller’s property without triggering the Cooperation Rule that requires mandatory submission of the listing to the MLS. Whether a particular listing is eligible for MLS submission; whether it is required to be submitted to the MLS, and how the listing may be marketed, depend on the applicable MLS rules and the listing agreement. The existence of an alternative does not necessarily answer whether it meets every seller’s objective.
Compass and other critics of mandatory submission emphasize seller choice: they question whether a seller and listing broker should be able to choose a broader marketing strategy without immediately placing the listing in the MLS. CRMLS responds that sellers have options for limiting exposure, including its “No Cooperation Listing” option (which is similar to the “office exclusive” category) for listings kept within a brokerage and not publicly marketed. The parties’ disagreement remains even though these options exist. Should public marketing trigger MLS submission, and, if so, how broadly should “public marketing” be defined? The answer depends on the particular MLS rule and the seller- authorized option at issue.
One of the key points raised by CRMLS is reciprocity: brokers using a cooperative listing system should contribute their publicly marketed exclusive listings under the applicable rules. CRMLS states that “the MLS exists because brokers agreed to pool their listing information: each broker contributes its listings in exchange for access to everyone else’s” listings.v For critics, the concern is that a mandatory submission rule may constrain a seller’s preferred marketing plan or a brokerage’s ability to offer a different model. Both positions invoke consumer interests, but they place different weight on shared access and control over a listing’s rollout.
Why follow a New York lawsuit brought by a California MLS? Because the same questions – what must be shared, when, and with whom – are being debated across MLS markets. The outcome may inform those discussions, although its direct effect will depend on the court’s ruling and the rules of each MLS.
Supporters of clear-cooperation rules say that prompt sharing gives participating brokers and consumers – both buyers and sellers – a more complete view of available properties and helps maintain the MLS as a cooperative resource. Critics emphasize that sellers may want more say over the timing and reach of marketing, and that brokerage models should have room to differ. CRMLS’s complaint puts those competing views before a court, but it is only the beginning of the case. How should MLS rules balance shared access to listings with a seller’s control over a marketing strategy?
i Complaint, Preliminary Statement.
v Complaint, ¶7.
