Related works: The Compass–NWMLS Settlement Changed the Private Governor After Washington Changed the Governing Law. Washington’s statute carries the binding rule, and the MLS agreement sits above it. From Inventory Control to Attention Control: The Compass Commission-Consolidation Model After First Look. Once visibility is required, the listing brokerage’s advantage moves to buyers who arrive without an agent. Compass Plan B, Structural Circumvention After Washington SSB 6091. A concurrent-marketing law is avoided through self-attested safety claims, buyer matching before a listing exists and agency rulemaking.
I. Executive Summary
On September 30, 2026 Compass chief executive Robert Reffkin told a conference of listing-service executives that Compass will sue any Multiple Listing Service (MLS) that fines agents for publicly marketing listings kept out of the MLS. He gave every MLS until October 6 to change its rules.
The California Regional Multiple Listing Service (CRMLS) refused Compass’s demand on September 30, the day of the ultimatum. CRMLS had received the same demand by letter on September 8 and published its formal response. CRMLS alleges that buyers had to drop their own agents to tour Compass listings held outside the MLS.
California has no statute on publicly marketing a listing kept out of the MLS. Each MLS writes its own rule, so the outcome there depends on private rulebooks and antitrust litigation unless the Legislature acts. Compass has said the suits begin in mid-October. On the day of the ultimatum Governor Newsom signed legislation extending California’s antitrust law to single-firm monopolization.
Washington’s Legislature has already regulated private listing marketing. Substitute Senate Bill (SSB) 6091 bars a broker from marketing a home to a limited group unless the broker markets it to the public and every other broker at the same time. The law regulates the broker’s conduct and never requires a seller to use an MLS. The law decides who can see a listing.
The dispute between Compass and CRMLS raises a question Washington’s law does not reach. Washington’s licensing regulator states that public marketing does not require an owner to allow access to the property. A listing advertised on a public website is visible to everyone, yet a buyer may still be unable to tour it or bid on it through the broker the buyer chose. Visibility and access are separate problems.
California does not need to require MLS submission to establish equal access. The controlling distinction is between submission and conduct. Civil Code section 1088 already provides that a listing may not enter an MLS unless the seller authorizes it. A conduct rule on Washington’s model leaves that section alone and governs what a broker may do once public marketing begins.
A California statute would rest on one principle. A seller can choose privacy. A broker cannot advertise a home and then deny other brokers’ buyers the same information and the same chance to compete.
A California statute would protect three things: public information, showing and offer access and representation independence. Washington’s law reaches the first. A California statute would reach all three.
MindCast analyzes the contest with Predictive Behavioral Economics + Dynamic Game Theory through the MindCast AI Proprietary Cognitive Digital Twin Foresight Simulation (MP CDT FS). Each institution becomes a Cognitive Digital Twin (CDT) with its own incentives and decision rules. Game theory supplies the payoff structure, and behavioral economics supplies the actors’ decision rules. MindCast has analyzed SSB 6091 since the statute’s first Senate hearing in January 2026.
The MindCast simulation sets the order of events. Compass files an antitrust complaint against at least one MLS by year-end at 77–90%. A California bill is introduced by the 2027 deadline at 47–63%.
A suit and a bill do not by themselves produce a uniform statewide rule. The most probable outcome at the end of 2027, at 52%, is that the rule still varies by MLS.
The decisive simulation result concerns the text of a California bill. The simulation expects the first version to contain no brokerage-neutral access rule, at 58–76%. Washington supplied California’s likely starting point and not its complete solution.
Each Simulation Prediction carries a cost for the institution that waits, and each cost has a date. The first external deadline is October 6, when MLS boards must decide how to answer Compass’s offer.
Simulation Prediction Highlights
Three primary Simulation Predictions lead the set of eight.
P-1 · 47–63%. A California concurrent-marketing bill is introduced by the 2027 bill-introduction deadline.
P-2 · 77–90%. Compass files an antitrust complaint against at least one MLS between October 6 and December 31, 2026.
P-3 · 58–76%, given P-1. The first California bill contains no brokerage-neutral access rule.
Stakeholder Readout
Five audiences carry an exposure with a date attached. No action removes an exposure entirely.
💼 Brokers: exposure to brokerage-dependent access practices that a first bill does not prohibit. First deadline: before the session convenes in December.
🤝 REALTOR Associations: a bill drafted by others reaches print without the access rule. First deadline: before the session convenes in December.
🗂️ MLS Leaders: an unbudgeted antitrust defense begins in the fourth quarter of 2026. First deadline: October 6.
🏛️ Lawmakers and Regulators: the access rule enters by amendment or waits one legislative year. First deadline: the 2027 bill-introduction deadline.
⚖️ Counsel: a complaint arrives before a litigation hold is in place. First deadline: October 6.
II. The Dispute and the Proposed Statute
A demand letter to one California listing service became, 22 days later, a dated ultimatum to every listing service in the country. California’s largest MLS refused in public the same day, and California has no statute to decide the question.
A. Current State: The Compass Demand, the Listing Service’s Refusal and the Washington Baseline
The dispute between Compass and CRMLS is the latest stage of a contest that first reached court in Washington. Compass sued the Northwest Multiple Listing Service (NWMLS) in April 2025 over rules that barred marketing a home before it entered the MLS. The parties ended that case with an August 31 agreement.
Compass renewed its demand on CRMLS on September 8, eight days after the August 31 agreement with NWMLS. CRMLS’s published documents show a first demand letter in November 2024. The September 8 letter demanded that CRMLS stop fining agents who publicly market office-exclusive listings, which are listings a brokerage keeps out of the MLS. The letter set an October 6 deadline and threatened a federal antitrust suit.
Compass frames its demand on CRMLS as seller choice. A company spokesperson said homeowners should be able to market any listing publicly without their agent facing fines. Inman reports that the letter commits Compass to spend millions of dollars suing CRMLS and other MLSs. Compass copied the letter to the Justice Department’s Antitrust Division and the Federal Trade Commission’s Bureau of Competition.
CRMLS refused on September 30 and published its response, as BAM reported. General Counsel Ed Zorn wrote that Rule 7.9 already lets a seller market a home publicly without MLS submission under an open or non-exclusive listing. The rule requires submission only when a broker holds an exclusive listing agreement.
Submission rules are private rules. The Clear Cooperation Policy of the National Association of REALTORS (NAR)requires a broker to submit a listing to the MLS within one business day of marketing it to the public. Each MLS enforces its own version, and neither Washington nor California imposes the requirement by statute.
CRMLS limits Rule 7.9 to exclusive listings to prevent free riding. A listing broker uses competitors’ MLS data to value a home and win the listing. Rule 7.9 asks that broker to share the resulting listing with the brokers who supplied the data.
CRMLS’s response also alleges conduct by Compass agents. CRMLS says buyers had to abandon their chosen agents to tour Compass listings held outside the MLS. CRMLS says one Compass agent required a buyer to list the buyer’s own home with that agent before granting access. MindCast treats both statements as allegations by one party to the dispute.
CRMLS widened the contest beyond two parties. Zorn listed seven counterclaims CRMLS would bring if Compass sues, including a group boycott claim under the Cartwright Act, California’s antitrust statute. CRMLS announced an MLS Cooperation Legal Defense Fund and requested money from the legal funds of the California Association of REALTORS (C.A.R.) and NAR.
Compass answered CRMLS on September 30. A spokesperson told RISMedia that Compass would take the CRMLS dispute to the courts. Reffkin told the conference that Compass will not settle the suits it files.
Washington’s statute answers only who can see a listing. SSB 6091 bars a broker from marketing a home to a limited group unless the broker markets it to the public and all other brokers at the same time. The only exception protects the health or safety of an owner or occupant. The duty attaches to the broker’s marketing, and nothing in the statute requires a seller to place a home in an MLS.
SSB 6091 passed 49–0 in the Senate and 92–1 in the House and took effect in June 2026. A violation is a violation of the state license statute, section 18.85.361 of the Revised Code of Washington (RCW). The Washington Department of Licensing enforces it through license discipline, so the rule binds every broker regardless of MLS membership.
Washington’s statute stops at marketing. The Department of Licensing states that marketing to the general public does not require an owner to allow access onto or into the property. The statute is silent on whether a listing broker may favor its own buyers in showings and offers.
NWMLS, Washington’s largest MLS, added a private layer above SSB 6091. The First Look status permits up to 21 days of public marketing while every listing still enters the MLS. MindCast’s The Compass–NWMLS Settlement Changed the Private Governor After Washington Changed the Governing Law explains the two layers, and the paper matters here because it shows that the statute carries Washington’s binding rule.
Visibility is only the first step in a purchase. A buyer who sees a home must still obtain full information, tour it and submit an offer. Each step can be made easier for the listing brokerage’s own buyers than for anyone else’s. A rule that stops at visibility therefore moves the advantage downstream to showings, offers and representation.
MindCast’s From Inventory Control to Attention Control: The Compass Commission-Consolidation Model After First Look examined the steps after visibility in Washington. The paper matters here because its lead Simulation Prediction, published at 62–68%, places the listing brokerage’s remaining advantage in Washington with buyers who arrive without an agent. The listing agent can represent those buyers as well.
The Compass–CRMLS dispute adds representation as a third step. CRMLS alleges that buyers who already had agents were told to drop them. The alleged harm falls on a different group from Washington’s, the buyers who chose their own broker.
California’s law differs from Washington’s. No California statute governs selective marketing, so each MLS decides for itself. Compass’s letter names eight MLSs that permit public marketing of office exclusives. Two operate in California: Bay Area Real Estate Information Services and MetroList.
CRMLS shares its listings with neighboring MLSs under data-share agreements. A broker can therefore leave CRMLS, join a neighbor and keep access to CRMLS listings.
MindCast’s The MindCast MLS Equilibrium Series explains why MLS rules diverge. The series matters here because it explains why MLS governance structure determines which MLSs accept a large member’s rule demands.
Washington regulated who sees a listing. California can decide whether public visibility also carries brokerage-neutral access and freedom of representation.
💼 Brokers: the rule that governs an exclusive listing differs by MLS today, and a statute would end that difference.
B. The Question and the Proposed Statute
The Compass–CRMLS dispute raises one question. Which California rule on selective marketing survives once the Legislature, the regulators, the MLS boards and the courts have responded to one another? The question stays open through the 2027–28 legislative session, when a statute can first pass.
Three subjects fall outside the paper’s scope: commission rates, the legality of dual agency and the merits of any antitrust claim. The answer sought is a rule design and not a verdict on any firm.
The proposed statute secures three protections and sets their limits. Each protection closes a gap that existing law leaves open.
Foundation: Seller Authorization. Existing law already protects the seller’s choice. Civil Code section 1087 defines an MLS as a facility of cooperation among agents, and section 1088 requires a seller’s authorization before a listing enters one. The proposed statute leaves both sections untouched and attaches its duties to the licensee’s marketing.
Section 1088 is the reason the proposed statute regulates conduct. A bill that required MLS submission would conflict with the seller’s right to withhold authorization. A conduct rule on Washington’s model does not touch that right.
Public Information. No California statute addresses selective marketing. Washington’s statute does, and its first months exposed a gap: the terms marketing and general public were left undefined. Compass argued that a listing available on request counted as public.
The proposed public information rule defines the missing terms in four provisions.
A licensee who markets a home to a limited group must market it to the public and to all other brokers at the same time.
Marketing covers any licensee communication about a home’s availability to a prospective buyer or broker under any listing agreement or before one exists.
Public marketing means visible without a login or a call to the brokerage.
A licensee may not give a limited group materially more complete property information than the public receives at the same time.
Material information includes the address, the asking price, days on market and the history of price changes. The rule governs information and leaves website design, ranking and advertising to each firm.
MindCast’s Compass’s Interpretation of “Public Marketing” May Draw Antitrust Scrutiny from State Attorneys Generaldocuments Washington’s undefined terms. The paper matters here because it shows how an undefined term let a brokerage claim that a listing available on request counted as public.
Showing and Offer Access. The California statutes reviewed for this paper do not say whether a listing broker may limit showings or offers by the buyer’s brokerage. Washington’s statute stops at marketing. An office exclusive advertised on a public website therefore satisfies a visibility rule even when other brokers’ buyers cannot tour it.
The proposed showing and offer rule is brokerage-neutral access. A licensee may not materially disadvantage a prospective buyer in obtaining property information, scheduling a showing or submitting an offer because another brokerage represents the buyer.
Brokerage-neutral access does not require identical treatment of every buyer. A seller may still set neutral criteria such as financial qualification and showing hours. Security, occupancy and offer terms remain the seller’s decision, and only selection by brokerage is barred.
Representation Independence. California already requires a written buyer-broker representation agreement under Civil Code section 1670.50, and C.A.R. sponsored the bill that created the requirement. Existing law does not bar a listing brokerage from making a buyer end that agreement to gain access. CRMLS’s allegations describe that practice.
The proposed representation rule has two parts.
No licensee conditions access on a buyer ending or changing representation, or on listing another property with the listing brokerage.
A listing broker tells an unrepresented buyer in writing at first contact that the buyer may hire any broker.
The ban on conditioning access makes state policy consistent. California requires a buyer to put representation in writing, and control of a listing should not become a means of making the buyer end that agreement. The written notice protects the buyer who has not yet chosen a broker.
Boundaries and Enforcement. California already has the enforcers. The California Department of Real Estate (DRE)disciplines licensees, and the Unfair Competition Law (UCL) gives public prosecutors a civil remedy. Governor Newsom signed Assembly Bill (AB) 1776 on September 30, which adds authority over single-firm monopolization from January 1, 2027.
The enforcement gap lies in exceptions and labels. MindCast’s Compass Plan B, Structural Circumvention After Washington SSB 6091 mapped how a concurrent-marketing law is avoided. The paper matters here because it identified self-attested safety claims, pre-listing buyer matching and agency rulemaking as the three weakest points of such a law.
The proposed statute sets six limits.
The safety exception requires independent documentation named in the statute, and a statement by the seller or the broker does not qualify.
Qualifying documentation is Safe at Home enrollment, a court order, a law enforcement assessment or a statement from a victim-services provider. Safe at Home is California’s address confidentiality program.
The exception relaxes public display only, and the listing still reaches all brokers.
The statute contains no written opt-out.
Function governs over labels, so a new product name or an affiliate arrangement cannot accomplish what the statute prohibits directly.
Every broker keeps a dated marketing log, and large brokerages report pre-market duration and same-brokerage closings to the DRE each year.
The reporting duty has one purpose. Aggregate data on same-brokerage closings lets the DRE test whether pre-market periods coincide with more sales in which the listing brokerage also represents the buyer.
Other states’ measures show the alternatives. HousingWire’s review of the state measures places four states on a written seller opt-out: Wisconsin, Illinois, Connecticut and New York. Hawaii’s bill follows Washington’s text. Each of these measures regulates what a broker must do or disclose.
The state measures reviewed for this paper do not combine information, access and representation rules in one statute. California can enact a version that does. The result would take selective marketing away from the broker and leave control of the listing with the seller.
The proposed statute’s clauses serve three layers: information, access and representation. Seller control and brokerage-neutral access coexist in each layer.
🏛️ Lawmakers: public information alone reproduces Washington’s rule. Access and representation are the parts California would add.
C. Why Predictive Behavioral Economics Adds Value
A cost-benefit reading of the listing contest fails because the people in it do not weigh costs and benefits evenly. Behavioral economics describes the decision rules they use instead, and four of those rules explain most of the conduct in the dispute.
Two of the four decision rules concern sellers. A seller responds to what the seller can see, so the privacy of a quiet sale outweighs buyers who never learned of the home. A seller also fears a stale listing more than the seller values extra exposure, which is why hiding days on market succeeds in a listing presentation.
The third decision rule concerns buyers, who follow defaults. A buyer without an agent contacts the name beside the listing. Whoever controls that first contact gains the first chance to represent the buyer.
The fourth decision rule concerns institutions, which judge an offer against a reference point. CRMLS reports that Compass praised a change to CRMLS’s Coming Soon listing status in meetings a couple of months before the September 8 letter. A concession that satisfied before First Look looked small after it.
The four decision rules together explain why disclosure forms change little. A form asks a seller to weigh an invisible cost against a visible benefit. A signed form therefore does little to change the choice.
D. Why Dynamic Game Theory Adds Value
A single-actor reading of the listing contest fails because each institution’s best move depends on what the others do. Game theory supplies the payoff structure for those choices. The structure explains both Compass’s persistence and CRMLS’s reply.
Compass’s demands work because each MLS answers alone. An MLS that receives a demand letter compares the cost of a federal defense with the cost of a rule change. Conceding is rational for each MLS and erodes cooperation for all of them together.
Compass has now added a reward to the threat. Reffkin said any MLS that agrees by October 6 receives a release of Compass’s claims and a data feed of its office exclusives. Each MLS weighs a dated offer against a dated lawsuit.
CRMLS’s defense fund changes the cost comparison each MLS makes. Pooled costs make refusal affordable for a small MLS, and the demand loses its leverage. The same logic explains why CRMLS published its response instead of replying in private.
A statute goes further than a defense fund and changes the game itself. A private MLS rule is an agreement among competitors and can be attacked under antitrust law. A state statute moves the rule from that agreement to an act of the Legislature, which changes the antitrust question.
Compass’s own argument points to a statute. Reffkin told the conference that only the seller and the law should direct how an agent markets a home. A statute would answer the demand on those terms.
A bill produces evidence before it produces a law. A committee hearing puts the same questions to every party, and the answers become public whether or not the bill passes. MindCast’s Compass’s Cross-Forum Contradictions documents that effect in Washington, and the paper matters here because it shows that hearing testimony gave enforcers their material before the statute was enacted.
Opponents of a statute have four known responses. The four are a written seller opt-out, a wider privacy exception, buyer matching before any listing agreement exists and exclusive portal arrangements. MindCast identified all four after Washington passed SSB 6091.
E. Ten Actors Shape the Outcome
The simulation turns the decision rules and payoffs into actors. Ten institutions and groups become CDTs, and the simulation plays each against the others across repeated rounds of action and response.
Legislative sponsors and committee leaders control introduction and amendments and respond to sponsor requests and hearing testimony.
The DRE, the Attorney General and district attorneys enforce license, competition and consumer law and respond to complaints.
C.A.R. sponsors real estate bills, runs a legal fund and responds to member pressure.
NAR makes legal-program grants, sets national MLS policy and limits its own exposure.
CRMLS writes and enforces its rules, controls data-share terms and responds to demand letters and member exits.
Peer MLSs set their own rules board by board and weigh legal cost against keeping members.
Compass litigates and negotiates with MLSs to preserve differentiated listing marketing.
Portals led by Zillow set display policies, lobby and fund, and seek broad listing access.
Competing brokerages choose MLS membership and firm policy and respond to lost buyers and lost listings.
Buyers and sellers choose representation and authorize marketing. Buyers want to see homes and compete for them, and sellers want privacy and a strong sale.
The Governor is not among the ten actors because none of the eight Simulation Predictions depends on a signature or a veto.
III. MindCast Simulation Predictions
The simulation released eight Simulation Predictions. Three are primary and five are secondary.
Litigation Comes First and Can Create the Case for Legislation
Two mechanisms drive the Simulation Predictions. One operates in the courts and MLS boardrooms, and the other operates in the Legislature.
In the courts and MLS boardrooms: Compass’s public deadline makes filing against at least one holdout its near-term move, and each MLS weighs the cost of defense against the cost of a rule change.
In the Legislature: divergent MLS rules create demand for one statewide floor, and introduction waits on a sponsor who supplies text.
Who decides today: private MLS boards, whose rules are exposed to antitrust claims.
What a statute would change: one rule would bind every licensee, and brokerage competition would move to service after the listing is visible.
What each actor does: Compass sues holdouts, CRMLS holds its rule, peer MLSs split and legislators wait for a sponsor.
Who can decide alone: no single institution within the Simulation Prediction windows, and only a statute binds every licensee.
The defense fund accelerates the litigation mechanism without driving it. Pooled costs make refusal affordable, which keeps private rules divergent until a statute or a court decides.
The litigation mechanism feeds the legislative mechanism. CRMLS’s refusal leads to a suit, and a suit gives California a local dispute with named parties and sworn filings. A dispute of that kind can bring a bill’s sponsor forward, so litigation is a step toward legislation as well as an alternative to it.
California Most Likely Ends 2027 With Different Rules Across Listing Services
Four outcomes describe where the rule stands on December 31, 2027. The probabilities sum to 100% because the outcomes exclude one another.
Rules still vary by MLS · 52%
Driver: each MLS weighs defense cost against a rule change.
Path: a suit is filed, CRMLS holds its rule and any bill remains pending.
Trigger: no statute, no decisive ruling and no CRMLS rule change.
CRMLS publishes a negotiated rule change · 18%
Driver: defense cost exceeds the value of holding the rule.
Path: funders decline, member exits rise and the parties negotiate.
Trigger: funders decline or subscriber exits accelerate.
A conduct statute is enacted · 16%
Driver: a sponsor converts the dispute into one statewide floor.
Path: introduction and hearings, then amendments and enactment.
Trigger: a sponsor supplies text and C.A.R. stays neutral or supportive.
A court order changes enforcement of Rule 7.9 · 14%
Driver: a court decides the rule’s legality.
Path: complaint, counterclaims and interim or final relief.
Trigger: Compass files and a court grants relief.
A suit can be filed and a bill introduced while rules still vary by MLS, provided neither concludes by the end of 2027.
A. Primary Simulation Predictions
Three primary Simulation Predictions state what happens in the Legislature and in the courts. Each states one observable event.
P-1 · A California Concurrent-Marketing Bill Is Introduced
Simulation Prediction: a member of the California Legislature introduces a bill that restricts marketing residential property to a limited group without concurrent public marketing.
Band: 47–63%
Window: opening of the 2027–28 session through the 2027 bill-introduction deadline.
Triggers: a sponsor supplies text, C.A.R. stays neutral or supportive, or Compass sues a California MLS.
Falsifier: the deadline passes with no such bill in either house.
Verification source: California Legislative Information.
P-2 · Compass Files an Antitrust Complaint Against at Least One Listing Service
Simulation Prediction: Compass files an antitrust complaint against at least one MLS in a state or federal court.
Band: 77–90%
Window: October 6, 2026 through December 31, 2026.
Triggers: the October 6 deadline passes with MLSs that have not changed their rules.
Falsifier: no complaint by Compass against any MLS appears on any docket in the window.
Verification source: the federal courts’ docket system (PACER) and state court dockets.
P-3 · The First California Bill Contains No Brokerage-Neutral Access Rule
Simulation Prediction: the first version of the bill with operative text contains no rule barring disadvantage in showings or offers because of the buyer’s brokerage.
Band: 58–76%, given P-1.
Window: the first version with operative text, once P-1 confirms.
Triggers: a sponsor drafts from Washington’s text or from California’s existing seller-instruction practice.
Falsifier: the first version with operative text contains such a rule.
Verification source: bill text on California Legislative Information.
P-3 is the most consequential of the eight Simulation Predictions. A first version follows its sponsor’s template, and the available templates begin with visibility. An access rule enters only if buyer accounts or draft language reach the sponsor before the bill is printed.
B. Secondary Simulation Predictions
Five secondary Simulation Predictions attach to the outcomes and to the primary entries. Each carries its own trigger and falsifier.
S-1 · 64–80%. A named institution publicly commits money to the MLS Cooperation Legal Defense Fund by March 31, 2027.
Linked to: the outcome in which rules still vary by MLS.
Trigger: CRMLS’s funding requests and a first suit.
Falsifier: no public commitment by the date.
S-2 · 42–62%. A California MLS other than Bay Area Real Estate Information Services and MetroList announces a rule change permitting public marketing of office exclusives by June 30, 2027.
Linked to: the negotiated rule change outcome.
Trigger: Compass’s offer of a release and a data feed.
Falsifier: no such announcement in the window.
S-3 · 58–74%. Compass files an antitrust complaint naming CRMLS between October 6 and December 31, 2026.
Linked to: P-2 and the court-order outcome.
Trigger: the October 6 deadline passes without a CRMLS rule change.
Falsifier: no complaint naming CRMLS appears on any docket in the window.
S-4 · 82–92%. CRMLS does not amend its rules to permit public marketing of an exclusive listing without MLS submission between October 6, 2026 and June 30, 2027.
Linked to: the outcome in which rules still vary by MLS.
Trigger: the CRMLS board’s answer to Compass’s offer.
Falsifier: CRMLS publishes such a rule change in the window.
S-5 · 80–91%, given P-1. The first California bill regulates licensee marketing conduct and leaves Civil Code section 1088 unamended.
Linked to: P-1 and the statute outcome.
Trigger: a sponsor supplies text.
Falsifier: the first version requires MLS submission or amends section 1088.
The secondary entries separate two questions the dispute tends to merge. Compass sues an MLS under P-2, and S-3 asks whether CRMLS is a defendant in the same window. S-4 holds that CRMLS keeps its rule in either case.
C. Questions That Carry No Simulation Prediction Yet
Four questions carry no band yet, because each waits on an earlier event. Two depend on who sponsors a bill: whether opponents seek a written seller opt-out and whether the first exception is limited to health or safety.
An association-sponsored bill and a portal or consumer-sponsored bill lead to different answers on the opt-out and on the exception. The simulation therefore holds them until a sponsor is named. The other two questions are enactment in the session’s second year and Compass’s adaptation to a statute.
MindCast will release a Simulation Prediction on each of the four questions when the event it waits on occurs.
D. Limits of the Simulation Predictions
One evidence gap limits the Simulation Predictions: CRMLS’s allegations about buyer access come from one party and have not been tested in any forum. Two events sit outside the four outcomes, a ballot measure on the subject and federal agency action against either party. Either would replace the contest the Simulation Predictions address.
A negotiated rule change and a court order are among the four outcomes. Each falsifies the entries it contradicts.
MindCast validates every Simulation Prediction publicly against its named source.
Working With MindCast
MindCast AI is a Predictive Behavioral Economics + Dynamic Game Theory firm. The firm models how institutions decide and how each responds to the others, using CDTs built from public evidence.
The paper models ten actors from public evidence. A commissioned simulation models one institution from its own documents and tests the specific decision that institution faces.
Five decisions raised in the paper are ready for that work.
🗂️ MLS Leaders: whether to accept Compass’s October 6 offer, hold the rule or negotiate. The simulation tests each choice against Compass’s response, member exits through data-share agreements and funder decisions.
🤝 REALTOR Associations: whether to sponsor a conduct statute, stay neutral or fund the defense. The simulation tests each position against the member split and the bill a sponsor would draft.
🏛️ Lawmakers and Regulators: which definitions, access rules and exceptions hold through amendment. The simulation tests draft language against an opt-out request and a wider privacy exception.
💼 Brokers: how a brokerage-neutral access policy and a dated marketing log change exposure under a suit and under a statute.
⚖️ Counsel: how each side’s litigation choices change cost and timing for an MLS, a brokerage or an association drawn into the dispute.
Commissioned work also covers the four questions the paper leaves without a Simulation Prediction. The four are the seller opt-out, the width of the exception, enactment and Compass’s adaptation to a statute.
Clients receive complete probability distributions, complete scenario trees, decision thresholds tied to named triggers and a monitoring system through the 2027 session.
A commissioned engagement begins with a scoped diagnostic session on one decision. Contact mcai@mindcast-ai.com to schedule one.
IV. Stakeholder Strategy and Risk Mitigation
Every Simulation Prediction leaves someone exposed when it resolves true and nothing was done. The exposure is stated in the unit each audience controls: a budget line, a board cycle, a legislative year or the scope of discovery. Each action names an owner and a date, and each entry states what the actions do not remove.
The risk entries are written for three decision roles. 🏛️ Policymakers covers lawmakers and regulators, and 💼 Executives covers brokerage, association and MLS leaders. ⚖️ Counsel covers their lawyers. The actions are analytic options and not legal, investment or fiduciary advice.
Exposure by Simulation Prediction
Thirteen risk entries follow, grouped here by severity. Each exposure assumes the entry resolves true and the audience took no action.
High severity
P-2 at 77–90%: MLS executives without a litigation reserve and MLS counsel without a litigation hold.
P-3 at 58–76% given P-1: the bill’s author, buyer-side brokerages and REALTOR associations.
S-2 at 42–62%: buyer-side brokerages in the affected territory.
Moderate severity
P-1 at 47–63%: legislators, the DRE and brokerage owners. Severity is high for firms that run pre-market programs.
S-3 at 58–74%: brokerage and association counsel.
S-5 at 80–91% given P-1: fiscal staff, the DRE and brokerage counsel.
Low severity
S-1 at 64–80%: association and MLS boards asked for money.
S-4 at 82–92%: brokerages in CRMLS territory. Severity is moderate for office-exclusive programs.
Probability and severity are separate measures. S-2 carries the lowest band in the set and a high severity for buyer-side brokerages, while S-4 carries the highest band and a low severity for most firms. The bands are not combined into one figure, because several entries depend on the same events.
Exposure in the Courts and the Boardrooms
The nearest exposure belongs to MLS boards, and the first date is October 6. A board voting on Compass’s offer needs a way to weigh the argument in the demand letter before the vote.
MindCast’s The Skillman Moment as Analytical Rosetta Stone of the MindCast MLS Equilibrium Series supplies a test for the demand letter’s argument. The paper matters here because it reduces the evaluation to three questions a board can answer from public sources. A Skillman Moment is a statement that works in a forum the speaker controls and fails when another forum asks the questions.
Does the argument hold in every forum, or only in the one where it is made?
Does the party argue the opposite when its position is reversed?
Do the party’s own documents contradict the argument?
Compass’s demand supplies an example of a party arguing the opposite when its position is reversed. Compass accepted mandatory MLS submission in Washington eight days before demanding the opposite in California. The first question remains open, because Compass’s argument has not yet faced a California legislative committee or regulator.
The board vote is the first mitigating action under P-2. Six entries cover the suit and the choices each MLS makes in response.
P-2 at 77–90% · Compass Files Against at Least One Listing Service
💼 Executives: MLS chief executives and boards
Exposure. An unbudgeted antitrust defense begins in the fourth quarter of 2026. The cost lands on the current operating budget.
Mitigating actions.
The chief executive puts Compass’s offer to a board vote on the merits, entered in the minutes, by October 6.
The chief financial officer adds a litigation reserve line to the 2027 budget before the board’s next budget meeting.
The risk manager confirms the scope of antitrust coverage under the MLS’s insurance policies by October 6.
Legal constraint. A joint refusal agreed among MLSs carries its own antitrust exposure, and a rule rewritten at one member’s request invites a claim from the others. The constrained version is an independent decision by each board, with pooled money limited to litigation defense.
Residual exposure. Compass can sue any MLS that keeps its rule, and defense costs can exceed the reserve.
⚖️ Counsel: MLS general counsel
Exposure. A complaint arrives before a litigation hold is in place. Board communications about Compass and rule-enforcement files fall inside discovery scope.
Mitigating actions.
General counsel issues a litigation hold covering board communications and rule-enforcement files by October 6.
General counsel writes the board memorandum stating the competitive basis for the rule before the board vote.
General counsel selects antitrust trial counsel by October 6.
Residual exposure. Documents already created remain discoverable, and the court sets the schedule.
S-3 at 58–74% · The Complaint Names the California Regional Listing Service
⚖️ Counsel: brokerage and association counsel
Exposure. Brokerages whose agents supplied accounts to CRMLS face third-party subpoenas. The subpoenas reach communications about showings and offers on Compass listings.
Mitigating actions.
General counsel issues an internal preservation notice for those communications by October 6.
General counsel names one person to receive subpoenas and party inquiries by October 6.
General counsel instructs agents to send press and party inquiries to counsel by October 6.
Residual exposure. The parties and the court set the scope of any subpoena.
S-1 at 64–80% · A Named Institution Funds the Defense
💼 Executives: association and MLS boards asked for money
Exposure. The funding question reaches the board inside one board cycle after a suit is filed. A board without a prepared position decides under that deadline.
Mitigating actions.
The chief executive places the funding request on the agenda of the next board meeting.
The treasurer identifies the funding source and a spending cap before that meeting.
General counsel confirms that any contribution is limited to litigation defense before the vote.
Residual exposure. Members who market listings privately will object to either decision.
S-4 at 82–92% · The California Regional Listing Service Keeps Its Submission Rule
💼 Executives: brokerages with office-exclusive programs in CRMLS territory
Exposure. Fines continue on each exclusive listing marketed publicly without MLS submission. Compass’s letter quotes the fine as 1% of list price, with a floor of $500 and a cap of $2,500.
Mitigating actions.
The managing broker audits active exclusive listings against Rule 7.9 by October 6.
The listing lead offers an open or non-exclusive agreement to sellers who want public marketing without MLS submission, starting October 6.
The training lead briefs every agent on the rule before the next listing is signed.
Residual exposure. An exclusive listing marketed publicly outside the MLS stays subject to the rule.
S-2 at 42–62% · Another California Listing Service Permits Public Marketing of Office Exclusives
💼 Executives: brokerages and neighboring MLSs
Exposure. Listings in one more territory leave the shared pool. Neighboring MLSs lose subscribers through data-share agreements.
Mitigating actions.
The brokerage’s operations lead sets up a direct procedure for requesting showings on listings held outside the MLS by March 31, 2027.
The neighboring MLS’s data-share lead lists the renewal dates and reciprocity terms of each data-share agreement for the board by its next meeting.
The listing lead revises the listing presentation to state the exposure a seller gives up outside the MLS by March 31, 2027.
Residual exposure. Access to listings held outside the MLS stays at the listing broker’s discretion.
The six litigation and boardroom entries share one feature. Every action is one an MLS, a brokerage or an association takes alone, and none depends on what Compass or a court does next.
🗂️ MLS Leaders: the board’s position matters more than the timing of any lawsuit.
Exposure in the Legislature
Legislative exposures run on the session calendar. The dates are the December convening, the 2027 introduction deadline and the first policy and fiscal hearings.
P-3 sets the largest legislative exposure. A first version that stops at visibility leaves the access rule to an amendment or to a second bill, and the entries below place the drafting work before the bill is printed.
P-1 at 47–63% · A California Bill Is Introduced
🏛️ Policymakers: legislators, committee staff and the DRE
Exposure. A bill arrives without agency input on its definitions. The definitions are then written by amendment during hearings or wait one legislative year.
Mitigating actions.
The author’s legislative director sends a drafting request with definitions of marketing and public marketing to Legislative Counsel before the session convenes in December.
The policy committee’s consultant prepares the questions on definitions for the first analysis before the introduction deadline.
The DRE’s enforcement division compiles its complaint data on listing access before the first policy hearing.
Residual exposure. Opposition amendments at hearing and the Governor’s action remain outside the author’s control.
💼 Executives: brokerage owners and managing brokers
Exposure. A statewide duty arrives with less than one year between introduction and a January 1, 2028 effective date. Every program that markets listings to a limited group must be rebuilt inside that period.
Mitigating actions.
The operations lead inventories every program that markets a listing to a limited group by the introduction deadline.
The compliance lead adds a dated marketing log to the listing workflow by the first policy hearing.
The government-affairs lead files the firm’s own position letter by the first policy hearing.
Residual exposure. The final text stays open until the last amendment, and rivals may keep selective programs until the effective date.
P-3 at 58–76% Given P-1 · The First Bill Contains No Brokerage-Neutral Access Rule
🏛️ Policymakers: the bill’s author, committee staff and the DRE
Exposure. The access rule must enter by amendment. An amendment costs hearing time, and a second bill costs one legislative year.
Mitigating actions.
The author’s legislative director includes brokerage-neutral access and representation language in the drafting request before the introduction deadline.
The policy committee’s consultant lists access and representation as questions for the first analysis.
The DRE’s legal office issues guidance on showing access under current license law by January 1, 2027.
Residual exposure. Later amendments can remove the language, and conduct before the effective date stays outside the statute.
💼 Executives: buyer-side and independent brokerages
Exposure. The statute’s first year leaves the firm exposed to brokerage-dependent access practices the statute does not prohibit. Each showing denied on that basis is a transaction the firm cannot compete for.
Mitigating actions.
The managing broker adopts and publishes a written brokerage-neutral access policy for the firm’s own listings before the session convenes in December.
The managing broker adds a written first-contact notice telling unrepresented buyers they may hire any broker by the same date.
The managing broker directs agents to keep a dated log of each denied showing or offer, starting now.
The government-affairs lead delivers draft access language to the firm’s association before the introduction deadline.
Legal constraint and linkage. A policy agreed among competing brokerages carries antitrust exposure, so the constrained version is a policy each firm adopts alone. The first-contact notice also bears on the lead entry in From Inventory Control to Attention Control, and the mitigation is counted here only.
Residual exposure. Other firms’ listings stay outside the firm’s control until a statute or an MLS rule binds them.
💼 Executives: REALTOR association executives
Exposure. A bill drafted by others reaches print without the access rule. The buyer-broker agreements that members sign under the law C.A.R. sponsored stay exposed to brokerage-based access limits through the statute’s first year.
Mitigating actions.
The legislative committee adopts a position on a conduct statute before the session convenes in December.
The government-affairs director drafts access and representation language before the introduction deadline.
General counsel checks the draft against Civil Code section 1670.50 before the introduction deadline.
Residual exposure. Members who market listings privately will oppose the position.
S-5 at 80–91% Given P-1 · The First Bill Regulates Conduct and Leaves Section 1088 Unamended
🏛️ Policymakers: fiscal committee staff and the DRE
Exposure. Enforcement falls on the DRE. A bill without a workload estimate stalls in the fiscal committee or passes without enforcement resources.
Mitigating actions.
The DRE’s budget office prepares a workload estimate before the first fiscal hearing.
The DRE’s enforcement division drafts a complaint intake form for selective-marketing complaints before the first policy hearing.
The author’s legislative director includes the dated marketing log in the drafting request before the introduction deadline.
Residual exposure. Enforcement still depends on complaints arriving.
⚖️ Counsel: brokerage general counsel
Exposure. Discipline exposure attaches to each licensee the broker supervises. One agent’s private marketing becomes the supervising broker’s license question.
Mitigating actions.
General counsel maps every channel the firm uses to tell a limited group about a listing by the introduction deadline.
General counsel drafts a supervision policy for those channels by the first policy hearing.
General counsel separates the seller’s MLS instruction from the marketing instruction in the firm’s listing agreement by the first policy hearing.
Residual exposure. Definitions can change in amendment.
The seven legislative entries point to one document, the drafting request. Access language, the marketing definitions and the dated log all enter the bill there or wait for an amendment.
🏛️ Lawmakers: the drafting request decides whether the first version goes beyond Washington.
Deadline Calendar
The mitigating actions fall on seven dates.
October 6, 2026: actions under P-2, S-3 and S-4. A first suit against an MLS calls for more.
Next board meeting: actions under P-2, S-1 and S-2. A funder’s commitment under S-1 calls for more.
Session convenes in December: actions under P-1 and P-3. A named sponsor calls for more.
January 1, 2027: DRE guidance under P-3. Public prosecutors gain single-firm authority on that date.
2027 introduction deadline: actions under P-1, P-3 and S-5. A printed first version calls for more.
First policy and fiscal hearings: actions under P-1 and S-5. An opt-out request calls for more.
March 31, 2027: actions under S-2. A rule change at a California MLS calls for more.
Four of the seven dates fall before a bill exists. An institution that waits for the bill has already passed most of its deadlines.
V. Implications
A conduct statute would change who holds authority, how each side responds and who gains. The changes decide which residual exposures shrink and which remain, and they add no new Simulation Prediction.
A. Institutional Impact
A conduct statute’s first consequence is institutional. A conduct statute moves authority over selective marketing from MLS rulebooks to license law. Under P-1 and S-5 the DRE becomes the first enforcer and public prosecutors the second.
MLS rules would continue above the statutory floor. An MLS could still offer coming-soon options and data services, and antitrust law would still apply to those private rules. The statute removes only the question of whether a broker may market to a chosen few.
A conduct statute also changes forum choice. A broker who objects to the rule would argue with the Legislature and not with an MLS in federal court.
The Attorney General’s single-firm authority begins January 1, 2027 and applies only where a firm holds substantial market power. A conduct statute would reach the same practices without that showing.
B. Strategic Interaction
A conduct statute’s second consequence is strategic, because each move draws a response. A mandatory duty draws a request for a written seller opt-out. A narrow safety exception draws a request for a general privacy exception.
Two positions remain stable against an opt-out request and a privacy exception. Seller MLS choice under section 1088 answers the seller-choice argument. Third-party documentation answers the privacy argument, because a court order or program enrollment cannot be mass-produced.
A suit under P-2 raises the odds of a sponsor under P-1, so litigation speeds a statute. A negotiated rule change slows a statute, and S-2 follows that outcome.
C. Distribution
A conduct statute’s third consequence concerns who gains and who gives something up. Independent buyer brokers gain the most from brokerage-neutral access, because their clients keep access to every marketed home. Sellers keep privacy as an option and gain wider exposure when they choose to market.
Large brokerages keep every advantage that comes from service, technology and reach. The statute removes one advantage only, which is the ability to hold marketed listings inside one firm’s network.
MLSs give up some rule-making discretion and gain protection from serial demands. An MLS that offers options below the floor would need to retire them, and CRMLS’s No Cooperation Listing is one example.
D. Falsifier Consequences
A failed Simulation Prediction changes what each audience faces. If P-1 fails, California’s rule continues to vary by MLS and the defense fund becomes the main protection for cooperative rules.
If P-2 fails, the October threat loses force and MLS boards gain room to refuse the next demand. If S-4 fails, a private demand has changed the rule in California’s largest MLS and the case for a statute rests on consumer evidence alone.
If S-5 fails, a submission mandate would collide with section 1088 and give opponents their strongest argument. If P-3 fails, California’s first bill has gone beyond Washington’s rule and the access question has reached drafters.
VI. Signals to Watch
Nine public signals move the Simulation Predictions and the deadlines attached to them. Each has a named source and a stated consequence.
C.A.R. legislative agenda or sponsor statement (P-1 and S-5)
Source: C.A.R. publications, monthly.
Changes: raises or lowers the odds of a statute.
Bill introduction and first version with operative text (P-1, P-3 and S-5)
Source: California Legislative Information, weekly from December.
Changes: confirms or falsifies all three entries.
Complaint against any MLS (P-2)
Source: PACER and state court dockets, weekly.
Changes: confirms P-2.
Complaint naming CRMLS (S-3)
Source: PACER and Superior Court dockets, weekly.
Changes: confirms S-3 and raises the odds of a court order.
CRMLS rule change on exclusive listings (S-4)
Source: CRMLS Rules and Policy Change Summary, monthly.
Changes: falsifies S-4 and raises the odds of a negotiated rule change.
California MLS permits public marketing of office exclusives (S-2)
Source: MLS rule notices and trade reporting, monthly.
Changes: confirms S-2 and raises the odds of a negotiated rule change.
Public funding commitment (S-1)
Source: C.A.R., NAR and MLS announcements, monthly.
Changes: confirms or falsifies S-1.
Named sponsor for a bill (questions that carry no Simulation Prediction yet)
Source: author statements and committee analysis, monthly from December.
Changes: allows a Simulation Prediction on the opt-out and the exception.
DRE or Attorney General statement (questions that carry no Simulation Prediction yet)
Source: agency releases, monthly.
Changes: may prompt a new Simulation Prediction.
MindCast publishes an update when a signal changes one of the actions in Section IV.
VII. Conclusion
The Simulation Predictions answer the paper’s question in two parts. Without a statute the rule continues to vary by MLS through 2027, with a Compass suit pending and CRMLS holding its rule. With a statute one rule binds every licensee, and the simulation expects the first version to stop at visibility.
Washington supplied California’s likely starting point and not its complete solution. The access and representation rules are the part California would have to write.
The first deadline is October 6, when MLS boards vote on Compass’s offer and their lawyers put litigation holds in place. Brokerages and associations have until the session convenes in December to adopt access policies and positions. Authors have until the 2027 introduction deadline to put access language in the drafting request.
The decisive signal is the first version of a bill with operative text. The bill’s introduction resolves P-1, and the bill’s content resolves P-3 and S-5.
Appendix A: Selected MindCast Works
Frameworks
The MindCast MLS Equilibrium Series. The series explains why MLS governance structure determines which MLSs accept a large member’s rule demands.
The Skillman Moment as Analytical Rosetta Stone of the MindCast MLS Equilibrium Series. The paper supplies the three questions an MLS board uses to test a rule demand.
Prior Simulations
The Compass–NWMLS Settlement Changed the Private Governor After Washington Changed the Governing Law. The paper shows that Washington’s statute carries the binding rule and the MLS agreement sits above it.
From Inventory Control to Attention Control: The Compass Commission-Consolidation Model After First Look. The paper separates broker access from consumer discovery and buyer interaction, which is the distinction the access and representation rules write into law.
Related Analysis
Compass’s Interpretation of “Public Marketing” May Draw Antitrust Scrutiny from State Attorneys General. The paper documents the undefined terms that the public information rule defines.
Compass Plan B, Structural Circumvention After Washington SSB 6091. The paper maps the avoidance paths that the statute’s limits close.
Compass’s Cross-Forum Contradictions. The paper shows that hearing testimony gave Washington enforcers their material before the statute was enacted.
Appendix B: External Sources
Primary Sources
California Regional Multiple Listing Service. CRMLS’s Formal Response. September 30, 2026.
California Regional Multiple Listing Service. The Case for Cooperation: Defending an Open Marketplace. Supporting documents include Compass’s November 2024 and September 2026 demand letters. September 30, 2026.
California Regional Multiple Listing Service. CRMLS Rules and Policy Change Summary.
California Regional Multiple Listing Service. Clear Cooperation Policy.
California Legislature. Assembly Bill 1776. Signed September 30, 2026 and effective January 1, 2027.
California Civil Code section 1087 and section 1088.
California Department of Real Estate. Consumer Alert: Changes to Buyer Representation and Compensation. November 2024.
Substitute Senate Bill 6091, Washington Laws of 2026.
Washington State Department of Licensing. News and Updates for Real Estate Brokers.
Northwest Multiple Listing Service. “Northwest MLS Expands Listing Options”. August 31, 2026.
Secondary Reporting
Brooklee Han. “Compass’s Reffkin gives MLSs an ultimatum: Change listing rules or face lawsuits”. HousingWire. September 30, 2026.
AJ LaTrace. “’We will spend millions’: Compass’ growing fight with MLSs explained”. Inman. September 30, 2026.
Jesse Williams. “Compass Threatens More Legal Action Against MLSs, with CRMLS Leading Opposition”. RISMedia. September 30, 2026.
Sarah Lentz. “CRMLS Rejects Compass Push to Keep Listings Off the MLS”. BAM. September 30, 2026.
Crowell & Moring. “The COMPETE Act Becomes Law: What the New Antitrust Law Means for California Businesses”. 2026.
HousingWire. Review of state private-listing measures. June 2026.
