Multiple Listing Service (MLS)

A multiple listing service is a shared database, organized by region, through which real estate brokerages publish the properties they have listed and see the properties other brokerages have listed. The Eighth Circuit, in the antitrust litigation over buyer-broker compensation, adopted the description in the record below it: "An MLS is a centralized database of properties which allows real estate brokers and agents to identify homes for sale within a defined geographic region." Real estate brokers and their affiliates or agents may access these shared catalogs if they are in compliance with the service's rules.

The abbreviation is used far more often than the words, and it names two things that are worth separating. The first is a local service, run as a business or as a cooperative among brokerages, with its own rules and its own territory. The second is the policy layer most of them sit under: as the court put it, "Most MLSs in the country are affiliated with NAR, and NAR provides rules that affiliated MLSs must follow." A rule that applies through that affiliation binds participants in affiliated services, not every licensee in the country.

Access is a brokerage relationship, and the vocabulary reflects that. An MLS admits Participants, ordinarily brokers, and Subscribers, ordinarily the licensees and staff working under them. That is why the practice changes adopted under the 2024 antitrust settlement are framed around MLS participants: the obligations attach to using the service. It also means the reach of any MLS rule has a boundary. A licensee who does not participate in an MLS is outside that rule set, although state licensing law and any applicable professional-conduct rules still apply.

The rule the litigation was about, and what replaced it. The National Association of Realtors adopted a rule in 1996 conditioning use of an affiliated service on the seller's broker offering compensation to the buyer's broker, and all NAR-affiliated services became obligated to enforce it as a condition of affiliation. Because those services dominate the residential market, the rule had nationwide reach. Under the settlement, that rule was eliminated: sellers are no longer obliged to offer compensation to buyer brokers in MLS listings, and any offer of buyer-broker compensation that is made must be disclosed to and approved by the seller in advance. The Eighth Circuit affirmed the approval of the settlement on 19 August 2026. Who now pays whom, and what the settlement did not change, is the real estate agent commission page's subject; this page publishes no rate and no settlement figure.

The seller's listing options changed separately, and this part is widely misreported. NAR's Multiple Listing Options for Sellers policy, in NAR's own words, "exists in conjunction with the Clear Cooperation Policy and other MLS policies". The Clear Cooperation Policy was not repealed, and it continues to require a listing to be filed with the service within one business day of public marketing. What the newer policy adds is two exempt listing states. An office exclusive is "an exempt listing where the seller has directed that their property not be disseminated through the MLS and not be publicly marketed", and it "shall be filed with the MLS but not disseminated to other MLS Participants and Subscribers". A delayed marketing listing is an exempt listing in which the seller has directed the listing broker to delay public marketing of the listing through the two distribution routes NAR names, IDX and listing distribution to third-party sites, for any period the local MLS allows in its unfettered discretion; NAR's exact wording is in the FAQ below. It is also filed with the service, and reading the two definitions side by side is what shows the difference: the office exclusive is expressly "not disseminated to other MLS Participants and Subscribers", while the delayed marketing delay is scoped to public marketing through those two distribution routes. Either route requires an exempt listing disclosure certified by the seller, covering the professional relationship, an acknowledgement of the MLS benefits being waived or delayed, and confirmation of the seller's decision. NAR also clarified that one-to-one, broker-to-broker communications about a listing do not trigger the Clear Cooperation Policy, while multi-brokerage communications do constitute public marketing under it. The policy is effective 25 March 2025 and had to be implemented by 30 September 2025, and its requirements apply only to listing types subject to mandatory submission under the local service's rules.

What a seller is actually choosing between. The default route puts the listing in front of every participant and, through those distribution routes, on the public websites that carry MLS data. An office exclusive keeps it inside one brokerage, undisseminated to other participants. A delayed marketing listing holds it off the public distribution routes for a period the local service sets. Each option trades exposure for control, and the disclosure requirement exists because that trade is the seller's to make knowingly. The length of a delayed marketing window is set by the local service in its own discretion, so it is a local question with no national answer.

A note on what the database is not. It is not a public register of property ownership, it is not a valuation source, and it is not a single national system. Consumer-facing portals display data drawn from these services, but the terms on which that data flows are set by the services and by the policies described above, which is why the same property can be visible in one place and not another at the same moment.

A brokerage that participates in a service takes a listing, files it with the service under the service's rules, and the listing becomes visible to other participants and, ordinarily, flows outward to the public websites that carry MLS data. Where the seller has chosen an exempt listing state, the filing still happens and the dissemination is limited or delayed accordingly. Offers come back through the participating brokerages.

A worked sequence, using dates rather than dollars because the money on a listing belongs to another page. A seller signs a listing agreement on a Monday and directs a delayed marketing exempt listing. The broker obtains the seller's signed exempt listing disclosure and files the listing with the service, where other participants can see it, but public marketing through those distribution routes is held back for the period the local service allows. On Thursday the broker emails several other brokerages about the property. That is a multi-brokerage communication, which NAR treats as public marketing under the Clear Cooperation Policy, so the one-business-day filing clock is engaged rather than avoided. Had the broker instead spoken to one other broker individually, NAR's clarification is that a one-to-one, broker-to-broker communication does not trigger the policy.

The reason to hold that distinction is that the two conversations look identical from the seller's side and are treated differently by the rules the listing is filed under.

Pros

• It puts a listing in front of every participating brokerage in the region at once, which is the exposure a seller is usually buying.
• It is the source most public listing websites draw from, so entry into the service is what makes a property findable.
• Standardized data fields make properties comparable, which is what allows a pricing analysis to be built from real sales.
• Since March 2025 a seller has documented choices about how public the marketing is, rather than a single default.

Cons

• Access runs through brokerage participation, so an owner selling alone reaches it only by buying a service from a brokerage, if at all.
• Rules are local. There is no single national service, and terms, fields and windows differ between regions.
• The policy layer changes: a rule central to the market for nearly thirty years was eliminated in 2024 and its removal was litigated into 2026.
• Choosing an exempt listing state trades away exposure, and the disclosure a seller signs is an acknowledgement of exactly that.
• The length of a delayed marketing window is left to each local service's own discretion, so there is no general answer to how long it can run.