Six multiple listing services covering parts of Arizona, California, Colorado and the Southeast have jointly sued Compass, Inc. in federal court in Manhattan. They are asking a judge to declare their listing-sharing rules lawful before Compass can sue to overturn them. The MLSs announced the complaint on Oct. 22, 2026, in a release distributed through PR Newswire. They say they represent more than 120,000 real estate professionals.
The plaintiffs are Arizona Regional Multiple Listing Service (ARMLS), bridgeMLS, Canopy MLS, Doorify MLS, Hive MLS and REcolorado. Their footprint takes in the Phoenix and Denver markets, Alameda and Contra Costa counties in the San Francisco Bay Area, and much of North Carolina, the Charlotte region included. The suit is filed in the U.S. District Court for the Southern District of New York. It is the second time this month that MLSs have gone to court ahead of Compass rather than waiting to be sued.
What the MLSs are asking the court to do
According to the release, the six organizations want a declaration that their cooperation rules comply with Section 1 of the Sherman Act, the federal antitrust law that bars agreements in restraint of trade, and with “applicable state antitrust laws.” They also seek an injunction preventing Compass from “bringing or pursuing antitrust claims against the six organizations based on the challenged cooperation rules,” plus attorneys’ fees and costs. None of that relief has been granted; the complaint is the opening filing in the case.
The rules at issue, which the release says each MLS adopted independently, generally require a participating broker to submit a listing to the MLS within one business day of marketing it publicly. The requirement mirrors the Clear Cooperation Policy that the National Association of Realtors requires of its affiliated MLSs. The MLSs say they keep exceptions for sellers with privacy concerns or who want limited marketing.
The suit follows demand letters Compass sent in September 2026, which the release says threatened litigation unless the MLSs stopped penalizing agents who publicly advertise properties without submitting them to the MLS. The plaintiffs argue that brokerages should not be able to draw on listings their competitors contribute while “withholding their own publicly marketed properties.” They also say withheld listings can deprive buyers of timely information on availability, price changes and days on market.
“These organizations are standing up for the thousands of brokers and agents who follow the rules and depend on a fair marketplace to serve their clients,” said Greg Skidmore, co-chair of the antitrust and competition practice group at Charlotte, N.C.-based Robinson Bradshaw. He is the lead attorney for the six MLSs. “These rules serve an important purpose for the consumers who buy and sell homes.”
The MLSs say they will keep enforcing their rules while the case proceeds.
Where Compass stands
The joint suit lands six days after Compass went on offense against CRMLS. In an Oct. 16 announcement, Compass said it had filed an antitrust lawsuit against California Regional Multiple Listing Service. Compass called CRMLS the nation’s second-largest MLS and said it issues fines of up to $2,500 when an agent publicly markets a property outside the MLS at a client’s lawful direction. Compass is seeking an order ending those rules and treble damages.
The company’s position is that “only the law and the homeowner should tell agents how to market a home.” It says MLSs serving more than 350,000 brokers and agents in at least 12 states do not fine agents for marketing homes outside the MLS. In the same announcement, Compass International Holdings said it would pay CRMLS fines imposed on agents at its company-owned brokerages, Coldwell Banker Realty, Compass and Sotheby’s International Realty, for marketing listings outside CRMLS at a client’s written direction. Agents who take that offer assign their right to sue CRMLS to Compass.
The Oct. 22 release from the six MLSs does not include a response from Compass. As of that afternoon, Compass had not posted one in its newsroom.
A widening front
The six-MLS complaint follows the path CRMLS took on Oct. 5, when it filed its own declaratory-judgment suit against Compass in the same Manhattan court. Since then, other large MLSs have refused Compass’s demands without going to court. Austin, Texas-based Unlock MLS said Oct. 6 it would keep enforcing Clear Cooperation. On Oct. 20, OneKey MLS, which covers New York City, Long Island and the Hudson Valley, rejected Compass’s demand.
The one dispute that has ended so far ended in a compromise. Northwest MLS in Washington state settled Compass’s earlier antitrust suit by adding a “First Look” status that hides days on market and price changes from the public for up to 21 days. Listings in that status stay visible to all member brokers.
On our reading, the MLSs’ choice of venue is a strategic one. Filing first in New York lets them frame the question as whether their rules are lawful, rather than defending against Compass’s damages claims in courts and on timelines of Compass’s choosing. Whether a judge will let a declaratory action head off Compass’s own suits is a question the court has not yet addressed in either case. For agents in these markets, nothing changes for now: the rules stay in force and the fines stay on the books.
More on the listing-access fight is in our agents and brokerages coverage.
