Washington Just Made Compass's Private Listing Strategy Illegal — and the Lawsuit That Forced the Issue

By Frances Flynn Thorsen

Introduction

Let me tell you something I've been watching unfold since I first started writing about real estate technology in the early 1970s — and I've seen a lot of industry-shaking moments in those fifty-plus years. From the dawn of fax machines at the Waldorf Astoria to microfiche readers in 1985 to the first MLS databases going online, every technological and structural shift in this industry has eventually run into the same wall: the question of who controls the information, and who benefits from that control.

The Compass v. NWMLS lawsuit, and the Washington state law it helped trigger, is that same question dressed in 2026 clothes. And the answer Washington's legislature gave — 141 to 1 — is about as unambiguous as it gets.

The Lawsuit: Compass v. NWMLS (April 2025)

On April 25, 2025, Compass, Inc. filed a federal antitrust lawsuit against the Northwest Multiple Listing Service (NWMLS) in the U.S. District Court for the Western District of Washington. The 43-page complaint alleged that NWMLS's rules were anticompetitive and threatened to put Compass out of business in the Seattle area.

The specific target was NWMLS's Rule 2, which requires that all listings be entered into the MLS within one business day of any public marketing. Compass's business model in Washington — its "Three-Phase Marketing" strategy, or 3PM — involves first marketing a property as a "Private Exclusive" (visible only to Compass agents), then as a "Coming Soon" listing, and only then entering it into the MLS. NWMLS said that violated their rules. Compass said the rules violated antitrust law.

The complaint was aggressive. Compass called NWMLS a "monopolist" that was "suing its own customer" — a framing that positioned Compass as the underdog fighting a powerful gatekeeper. CEO Robert Reffkin had been making this argument publicly for months, including in a March 2026 Inman op-ed that framed agent fiduciary duty as superseding MLS rules.

But NWMLS didn't just defend itself. It filed counterclaims.

NWMLS Fires Back: The "Negative Insights" Allegation

NWMLS's counterclaims introduced a phrase that has become the most legally significant detail in this entire case: "negative insights."

That's Compass's own internal terminology for days-on-market data and price-drop information — the kind of data that tells a buyer "this property has been sitting" or "the seller already dropped the price once." When a listing goes through Compass's Private Exclusive phase before hitting the MLS, that time doesn't count toward the MLS days-on-market clock. The "negative insights" are stripped from the public record.

NWMLS alleged that this is not just a competitive strategy — it's a deceptive scheme that harms buyers by hiding material information about a property's market history.

The counterclaims also pointed to a striking contradiction in Compass's own documents. On one hand, CEO Reffkin told investors on the Q1 2025 earnings call that private exclusives carry "no downside" for sellers. On the other hand, Compass's own client-facing Disclosure Form — the document sellers sign when they agree to the 3PM strategy — explicitly acknowledges that private exclusive marketing "may reduce the number of potential buyers," "may reduce the number of offers," and may reduce "the final sale price."

Both documents are public. Both are in writing. They make opposite factual claims about the same product.

Washington State Responds: SSB 6091

While the lawsuit was working its way through federal court, something remarkable happened in Olympia.

Washington's state legislature took up the private listing question directly. Senate Bill 6091 — which requires that all listed properties be submitted to the MLS within one business day of any marketing — passed the Washington State Senate 49 to 0. It passed the House 92 to 1. Governor Bob Ferguson signed it into law.

141 to 1. That is not a close vote. That is a statement.

The law takes effect June 11, 2026. After that date, Compass's Three-Phase Marketing strategy — at least the Private Exclusive phase — will need to comply with Washington state law or be abandoned in the state entirely.

This creates a legal trap that Compass's April 23 Motion to Dismiss does not address, and almost certainly cannot address.

The Motion to Dismiss: What Compass Didn't Say

On April 23, 2026, Compass filed a Motion to Dismiss NWMLS's counterclaims — 29 pages, 8,356 words. NWMLS has until July 18, 2026 to respond. Trial is set for October 2026.

Legal analysts who have reviewed the motion have noted three significant silences.

First, the motion does not address the "negative insights" phrase anywhere — not in the fraud section, not in the consumer protection section, not in the standing section. The phrase is the deceptive-practice anchor of NWMLS's entire consumer protection count, and the motion responds to a counterclaim built on labels rather than to the counterclaim NWMLS actually filed.

Second, the motion does not address the Reffkin earnings call statement or its contradiction with the Disclosure Form. Any developed engagement with that contradiction requires Compass to either reconcile two irreconcilable statements or throw one of them under the bus — neither of which improves their position at summary judgment.

Third, and most significantly, the motion does not address paragraph 43 of NWMLS's counterclaims, which establishes Compass's knowledge that the 3PM strategy will violate SSB 6091 after June 11. The Parker v. Brown state-action immunity doctrine holds that private actors enforcing standards mandated by state law cannot be held liable under federal antitrust law for conduct the state itself requires. Post-June 11, NWMLS's Rule 2 becomes anticipatory statutory compliance with a law Washington legislators voted 141-1 to enact.

The motion's silence on these three elements is not an oversight. It is a strategic calculation. Each available response locks Compass into a litigation theory that is worse than saying nothing.

What This Means for Buyers, Sellers, and Agents

If you're a buyer in Washington state, this matters directly. The Private Exclusive phase of Compass's 3PM strategy means that some properties are only visible to Compass agents — and their clients — before they hit the MLS. If you're working with a non-Compass agent, you may not have seen those properties during their most active marketing window. After June 11, that changes.

If you're a seller, the question is simpler: do you want the widest possible audience for your home, or do you want to start with a smaller pool? The Compass Disclosure Form is honest about the tradeoff. SSB 6091 is Washington's answer to that question at the policy level.

If you're an independent agent or a small brokerage, this case is about market access. Thousands of independent agents in the Pacific Northwest built their businesses around a fair, open MLS. Private listing networks — and the "negative insights" they create — threaten that market. The Zillow v. Compass/MRED lawsuit filed in Chicago on May 12, 2026 makes the same argument at the national level.

The Bigger Picture: A National Pattern

The Compass v. NWMLS case does not exist in isolation. It is part of a coordinated national debate about whether private listing networks serve consumers or primarily serve the brokerages that operate them.

Washington state answered that question legislatively. Illinois may be next — the Zillow v. MRED/Compass lawsuit filed May 12 in the Northern District of Illinois raises the same Sherman Act arguments in a different jurisdiction. The FTC's antitrust lawsuit against Zillow and Redfin, currently proceeding in the Eastern District of Virginia after Judge Trenga denied the motion to dismiss on May 7, adds a federal regulatory dimension to the same underlying question.

The October 2026 trial in the Compass v. NWMLS case will be one of the most closely watched real estate industry proceedings in years. The NWMLS response to Compass's Motion to Dismiss, due July 18, will be the next major document in the public record.

We'll be tracking both.

Key Dates to Watch

Image Credit: Nano Banana