California MLS Sues Compass Brokerage Over Hidden Listings

A major California real estate organization has filed a federal lawsuit against brokerage giant Compass, alleging the company is attempting to gain an unfair advantage by keeping home listings private while leveraging data from competitors.

California Regional Multiple Listing Service (CRMLS) filed its complaint on October 5 in the U.S. District Court for the Southern District of New York. The lawsuit escalates a dispute over whether real estate agents can publicly advertise properties without sharing those listings with competing brokers through the MLS.

The core of the conflict centers on "office-exclusive" listings – properties that brokerages can choose to keep off the MLS, the primary database used by agents to find homes for sale.

CRMLS argues that Compass wants to publicly market its own properties to attract buyers while simultaneously withholding those same listings from the MLS, thereby accessing competitors' data without reciprocal sharing. "What the rules do not permit is having it both ways — publicly marketing a property to attract buyers while simultaneously withholding that property from the MLS cooperative," CRMLS attorneys stated in the complaint.

Compass contends that homeowners should have the right to publicly advertise their properties without being obligated to list them on the MLS. The brokerage claims that MLS organizations in other regions already permit this practice.

"Homeowners should be able to publicly market any listing — including office-exclusive listings — without their agent facing thousands of dollars in fines," a spokesperson for Compass International Holdings told Inman.

CRMLS CEO Art Carter criticized Compass's stance, asserting that the company seeks to exploit a system built on cooperation. "Compass has rejected our reasoning and is advancing legal arguments that we believe are unfair and would allow Compass to free ride on the hard work of cooperating CRMLS subscribers," Carter said in a statement.

The dispute intensified after Compass issued a demand letter on September 8, threatening legal action if CRMLS did not agree by October 6 to stop penalizing agents who advertised office-exclusive listings publicly. Compass CEO Robert Reffkin publicly announced the company's intention to file a federal antitrust lawsuit against CRMLS.

Reffkin also pointed to a 2018 CRMLS seller exclusion form, which he argued indicated that the organization previously allowed homeowners to market properties publicly without immediately entering them into the MLS.

Under current CRMLS rules, brokers are generally required to submit residential listings to the MLS within one business day of publicly marketing them. While agents can maintain office-exclusive listings, these properties cannot be publicly advertised while remaining outside the shared system.

CRMLS is seeking a federal court declaration that these rules are lawful under federal and California antitrust laws. The organization also aims to permanently prevent Compass from pursuing antitrust claims against these rules and is requesting reimbursement for attorney fees and costs.

In response, CRMLS is establishing an MLS Cooperation Legal Defense Fund to support efforts to maintain listing transparency and cooperation within the industry. Carter stated, "This case is about protecting a marketplace that works for all real estate professionals and consumers."