How A Chicago Listing Fight Ended in Zillow Lawsuit

Zillow’s lawsuit against the Chicago-area MLS and Compass shocked the real estate world this week. But for those paying attention in Chicago, it was the spillover of a long-brewing standoff between the rival companies.

By Zillow’s telling, Midwest Real Estate Data and Compass used their huge power over listing flow to pressure Zillow to show listings that were previously marketed off its platform or have its access cut off to a large swath of Northern Illinois real estate listings.

Compass International Holdings CEO Robert Reffkin responded on Wednesday, saying Zillow’s lawsuit was motivated by protecting its profits and access to listing data.

“While Compass is fighting to protect agents and homesellers with choices, Zillow is fighting to control agents and homesellers,” he wrote.

The 53-page complaint filed in the Northern District of Illinois outlines a protracted fight over Chicago’s listing data over the last year. It paints a picture of private messages, behind-the-scenes meetings and rule changes that Zillow claims were designed to give the MLS a pretext to terminate Zillow’s listing feed if it enforced its rules in Chicago.

What’s at stake is whether the country’s largest brokerage can coordinate with the listing servicess to dictate the terms of the country’s largest home-search portal.

“This could prompt brokerages and MLSs to reassess alliance strategies and market influence,” T3 Sixty vice president Derek Taylor wrote in a LinkedIn post on Tuesday. “As tech continues to embed deeper into our industry, keeping an eye on how these legal battles unfold might just reveal the next shifts in competitive strategies,” Taylor said.

How we got here

The dispute has its origins in the National Association of Realtors’ 2020 Clear Cooperation Policy, which required brokerages to submit listings to their local MLS within one business day of public marketing. Compass lobbied against the rule, and in March 2025, NAR carved out exceptions through its Multiple Listing Options for Sellers policy, giving brokerages room to market listings privately before going public.

Fearing the proliferation of private networks, Zillow announced its Listing Access Standards in April 2025, requiring listings to be publicly available on its websites within one business day of public marketing. Compass sued Zillow over the standards, but dropped the lawsuit this March after a judge denied their request to temporarily pause the rules, and Zillow eased them.

The standards were largely a response to Compass’s in-house private exclusives, but MRED’s Private Listing Network — a Chicago-only mechanism launched in 2016 that lets agents share listings with all MRED members while keeping them off public sites like Zillow — was also captured by the rules. Even opponents of private marketing strategies in the Chicago area often say the private network makes for a more level playing field than in other regions.

In October 2025, according to Zillow’s lawsuit, Reffkin sent a letter to multiple MLSs, including MRED, urging them to terminate their data feeds with Zillow. Shortly after, MRED introduced new rules that explicitly barred platforms from filtering its listings based on “the identity of any Participant, brokerage firm, subscriber, licensee, or representative.” Because Zillow’s rules block listings based on the number of times a specific agent has marketed listings off-platform, this rule became the basis for MRED’s attempt to block enforcement of Zillow’s rules, according to the lawsuit.

MRED CEO Rebecca Jensen sent a message to some MRED managing brokers in November saying Zillow had been warning agents that listings that start out on the private network before going public would be blocked. Jensen directed the email be sent “if there was any chance that Zillow would enforce the Standards in MRED’s region,” according to the complaint.

The threats continued through the winter. Fearing the loss of access to MRED’s data, Zillow contacted brokerages throughout Chicagoland asking for direct back-up feeds in December. Following a real estate industry meeting in January, Jensen told a Zillow representative that “she was not backing down when it came to cutting off Zillow’s Listing Feed,” according to the complaint. Despite the threats, the dispute remained in a stalemate until April.

Meanwhile, Compass had taken a large share of Chicago’s real estate market through its acquisition of Anywhere Real Estate, gaining Coldwell Banker, Century 21, Sotheby’s International Real Estate and other brands. Zillow’s lawsuit alleges the merger brought 35 percent of MRED’s residential real estate transactions under Compass’ agents. The merger also gave Compass more influence on MRED’s board, according to the lawsuit. Three MRED board members are affiliated with Compass, according to the lawsuit, including regional vice president Fran Broude.

Shortly after the merger, Coldwell Banker terminated more than 20 direct listing agreements with Zillow, including the feed for a Chicagoland office, according to the complaint. In February, Compass itself cut off its Chicago-area feeds to Zillow, meaning Zillow would lose access to those listings if MRED pulled the plug, according to the complaint.

The MLS goes national

Compass and MRED took the pressure on Zillow national in April with the decision to expand the MLS nationally, according to the lawsuit. MRED announced it would open access to its MLS, including the Private Listing Network, to any agent in the country, while Compass agreed to syndicate its national inventory, including private exclusives and coming soon listings, to the MLS. The agreement was followed by similar agreements with Realtracs in Tennessee and California-based “The MLS.”

On May 5 and 6, MRED and MLS Grid — MRED’s listing distribution provider, whose board Jensen chairs — sent Zillow emails flagging several Compass listings in Florida, Georgia and California that Zillow had blocked under its standards. Because these listings were now being syndicated through MRED, the MLS “demanded an explanation” for why they were not displayed on Zillow.

“The clear import of the coordinated May 5 and 6 communications from MRED and MLS Grid is that Zillow would lose access to all MRED listings if Zillow does not fall in line and unwillingly display—anywhere in the country—Compass listings that violate Zillow’s Standards,” Zillow wrote in the complaint.

The same week, Jameson Sotheby’s International Realty — a Chicago-based brokerage in which Compass had acquired a 51 percent controlling stake on April 15 — terminated its Zillow feed authorization nationally. On May 8, Compass terminated direct listing feeds to Zillow nationwide for all its subsidiaries. The cutoff covered more than 25 percent of current Chicagoland listings, according to the complaint.

Zillow alleges its case illustrates long-running coordination between Compass and MRED to box out a competitor, claiming the companies engaged in “group boycott” in violation of the Sherman Antitrust Act. A second claim argues MRED used its monopoly over Chicago-area residential listings to rewrite its rules to target Zillow’s listing standards.

Outside Chicago, brokerage executives are keeping a close eye on the litigation. Bess Freedman, the CEO of Brown Harris Stevens, said Compass’ strategy goes against the spirit of a transparent market.

“Compass wants to have it both ways,” Freedman said. “They want to be able to have private listings and do what they want when they want. No, you have to share the info.”

Freedman, whose brokerage operates in New York, Florida, Connecticut and New Jersey, said the broader industry concern is what happens to the cooperative MLS system if private networks proliferate.

“The spirit of clear cooperation and co-broking is to share information in a timely manner,” she said. “You cannot hide that information or select who you get to share it with. That is where you create fracture.”