Compass filed the lawsuit last summer asking the court to stop Zillow from enforcing its Listing Access Standards, which sought to halt an anticipated surge in publicly marketed private listings.

The parent company of the Homes.com real estate portal said the "investment phase" is over, and that selling or abandoning the site would be premature.

Realtor.com's parent company saw revenue increase 10 percent year over year. The CEO of the firm that owns the portal took the opportunity to call rival Homes.com a potential "knockdown."