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Compass Inc. (NYSE: COMP) has filed a lawsuit against Seattle-based Northwest Multiple Listing Service (NWMLS), accusing it of “monopolistic” and “anticompetitive” behavior.

Earlier this month, NWMLS suspended Compass’ IDX feed, citing the brokerage’s private exclusive listings in the Seattle market. The New York Times reports that NWMLS reversed the suspension one day later but still maintains its rule that brokerages either enter home listings on the MLS immediately or not enter them at all.

“With NWMLS’s anticompetitive and tortious conduct, the only way a home seller in the Seattle area can effectively have the choice on how to market their home is to forgo using a professional real estate broker at all, because NWMLS has 100% of the real estate brokers in the Seattle area,” said Compass lawyers in their complaint, alleging that NWMLS policy against pre-marketing and private exclusives “prevented meaningful competition from gaining traction.”

NWMLS did not immediately comment on the lawsuit.

Since last November, Compass has promoted its Private Exclusives marketing channel of roughly 7,000 home listings that are available only for Compass agents and their buyers. Compass CEO Robert Reffkin posted on Instagram, “Fair housing isn’t optional. At Compass, we believe inclusion and innovation must go hand in hand. That’s why we have taken concrete, proactive steps to ensure Compass Private Exclusives fully align with Fair Housing principles.”