The prominent plaintiffs’ law firm Hagens Berman, widely recognized for its pivotal role in the landmark Moehrl commission lawsuit, has launched a formal investigation into potential class-action claims against Compass International Holdings and the Midwest Real Estate Data (MRED) multiple listing service. The investigation focuses on allegations that the two entities have established a monopolistic grip on the Chicagoland real estate market, leading to inflated home prices and a systemic lack of transparency for prospective buyers. The firm is currently seeking contact from consumers who purchased residential property in the Chicago metropolitan area on or after April 24, 2026, as it prepares to challenge what it describes as anti-competitive practices that disadvantage homebuyers.
At the center of the inquiry is the assertion by Hagens Berman’s antitrust attorneys that Compass and MRED collectively control approximately 98% of the real estate listing market in Chicago. The firm alleges that this dominant market share is being leveraged to manipulate listing data and restrict the flow of information to the open market. According to the firm’s public notice, this control allows for the suppression of critical data points, such as "days-on-market" (DOM) statistics, which are traditionally used by buyers to gauge the fair market value and desirability of a property. By allegedly withholding this information, the firms are accused of creating an environment where buyers are forced to pay premiums for homes without the benefit of historical pricing context.
The Mechanics of the Alleged Monopoly and Market Manipulation
Hagens Berman’s legal theory posits a twofold negative effect on the Chicago housing market. The first component involves the use of "Private Exclusives" and "Coming Soon" listings. The firm alleges that a significant portion of the housing inventory is being withheld from the broader public, effectively shutting out most buyers from even knowing certain properties are for sale. These private listings are often circulated within limited networks before—or instead of—being posted to the public-facing Multiple Listing Service (MLS).
The second component of the alleged harm occurs when these properties eventually transition to the open market. Attorneys argue that when a home is finally listed publicly after a period in a private silo, the "days-on-market" counter is often reset or obscured. In a standard real estate transaction, the length of time a home has been listed is a primary indicator of its market standing; a high DOM often signals to a buyer that there is room for price negotiation. Hagens Berman contends that by depriving buyers of this data, Compass and MRED prevent consumers from distinguishing between an overpriced listing and a fairly priced one, leading to what they describe as "overpayment by design."
A History of Real Estate Litigation: The Context of Hagens Berman
Hagens Berman is no stranger to high-stakes antitrust litigation within the real estate sector. The firm was a primary architect of the Moehrl v. National Association of Realtors (NAR) lawsuit, which targeted the long-standing industry practice of requiring seller brokers to offer compensation to buyer brokers. That litigation, alongside the Sitzer/Burnett case, resulted in transformative settlements that have fundamentally altered how real estate commissions are structured across the United States.
In addition to the commission-focused lawsuits, the firm has recently targeted other major players in the real estate technology space. In September 2023, Hagens Berman represented plaintiff Alucard Taylor in a lawsuit against Zillow. That case alleged that Zillow’s "contact agent" feature was deceptive, leading consumers to believe they were contacting the listing agent when they were actually being routed to premier agents who paid for leads. While that specific case saw a dismissal in July 2024, the legal team has since filed an amended complaint, signaling a persistent strategy of challenging the digital infrastructure of the modern real estate market.
Supporting Data: The Price of Private Exclusives
The investigation cites data produced by Compass itself to support the claim that private listing practices result in higher costs for buyers. In a company analysis of 70,809 transactions closed between April 2025 and March 2026, Compass found that homes marketed as "Private Exclusives" or "Coming Soon" before hitting the MLS sold for 4.6% more than comparable homes that were listed directly on the open market. This figure represents a notable increase from a similar study conducted in February 2025, which showed a 2.9% premium for 2024 transaction data.
While Compass has historically framed these statistics as a benefit to home sellers—demonstrating the efficacy of their marketing strategies—Hagens Berman interprets the data through a different lens. The firm argues that this 4.6% premium is essentially a "tax" on buyers who are forced to bid on homes in a restricted environment. From an antitrust perspective, the firm alleges that this premium does not reflect superior service, but rather a price inflation caused by the artificial restriction of supply and the withholding of comparative market data.
Chronology of Related Legal Challenges
The current investigation by Hagens Berman does not exist in a vacuum; it follows a series of legal maneuvers involving the same defendants. The timeline of these events highlights a growing tension between traditional MLS structures and the proprietary platforms of large-scale brokerages.
- Late 2023 – Early 2024: Following the initial wave of commission lawsuits, major brokerages began emphasizing "private" and "off-market" networks as a way to maintain value propositions for their agents.
- February 2025: Compass releases data showing a 2.9% price premium for homes starting in their private network, using this as a recruitment and retention tool for agents and sellers.
- Early 2026: Zillow, the nation’s largest real estate portal, files a separate antitrust lawsuit against MRED and Compass. Zillow’s complaint alleges that the two entities conspired to withhold MRED’s listing feed from Zillow’s platform, thereby harming the visibility of listings and disadvantaging consumers who rely on third-party portals for home searches.
- March 2026: Compass updates its transaction data, revealing that the "private listing premium" has grown to 4.6%.
- April 2026: Hagens Berman officially begins seeking plaintiffs for a class-action suit, focusing on the specific window of transactions occurring from late April 2026 onward.
Official Responses and Industry Silence
When approached for comment regarding the Hagens Berman investigation, the parties involved have remained largely guarded. A spokesperson for Compass stated that the company did not wish to comment on the law firm’s post or the ongoing investigation. Similarly, Midwest Real Estate Data (MRED) did not immediately return requests for comment.
This silence is typical in the early stages of potential class-action litigation, but it also reflects the sensitivity of the "Clear Cooperation Policy" debate. The National Association of Realtors’ Clear Cooperation Policy generally requires brokers to list a property on the MLS within one business day of marketing it to the public. However, "office exclusives"—listings marketed only within a single brokerage—are a notable exception. The Hagens Berman investigation suggests that in a market as concentrated as Chicago, where a single brokerage and a single MLS hold such high market share, these exceptions may effectively function as a monopoly.
Broader Impact and Market Implications
If Hagens Berman proceeds with a formal lawsuit and is successful, the implications for the real estate industry could be profound. A victory for the plaintiffs would likely challenge the legality of "Private Exclusive" programs across the country, not just in Chicago. It would force a conversation on whether proprietary brokerage networks violate the Sherman Antitrust Act by creating "walled gardens" that prevent true market competition.
Furthermore, the focus on "days-on-market" data could lead to new regulatory requirements for data transparency. If the courts determine that withholding historical listing data constitutes consumer harm, MLSs across the United States might be required to implement more rigorous tracking of a property’s entire lifecycle, regardless of whether it spent time in a "private" or "coming soon" status.
For the Chicagoland market specifically, the investigation threatens the status quo of MRED, which has long been the dominant force in regional property data. If MRED is found to have conspired with a major brokerage to limit data access, it could face significant financial penalties and be forced to restructure its data-sharing agreements with third-party portals like Zillow and Redfin.
Conclusion: The Path Forward for Chicago Homebuyers
Hagens Berman’s call for plaintiffs signals the beginning of what could be a multi-year legal battle. The firm’s strategy relies on the premise that "no individual homebuyer can take on the companies that control a region’s entire listing market," but that collective action can restore balance. As the investigation continues, the real estate industry will be watching closely to see if the 4.6% price premium touted by Compass becomes the very evidence used to dismantle the "private listing" model. For now, the focus remains on the Chicagoland buyers of 2026, whose transaction data may soon become the center of a landmark antitrust trial.
