Will any Zillow-related lawsuit produce a material ruling favorable to CoStar by end of 2026?

Federal litigation timelines strongly argue against a material ruling by end of 2026. The lawsuits were filed June-September 2025. Federal copyright and antitrust cases typically take 2-4 years to reach substantive rulings. Discovery alone in a case like CoStar v. Zillow would take 12-18 months. The FTC case is the most likely to produce early action (FTC has more resources to accelerate), but even FTC cases rarely resolve within 18 months. A settlement with behavioral remedies is the most plausible path to a 'YES' resolution by end of 2026, but Zillow has little incentive to settle early.

Focusing on base rates: how often do federal lawsuits filed 15-18 months prior produce material rulings? The answer is very rarely for complex commercial litigation. Preliminary injunctions in copyright cases require showing irreparable harm AND likelihood of success on merits — a high bar. The FTC antitrust case is the exception where government can sometimes move faster, but current political environment creates uncertainty about enforcement priorities. Even the Xceligent precedent (which CoStar won) took years. Multiple simultaneous suits may actually slow things down as courts consider consolidation.

Slightly higher probability accounting for the possibility that the FTC case, being a government enforcement action, could move faster than private litigation. The FTC has sued under antitrust laws where consent decrees can be negotiated relatively quickly if both parties see mutual benefit. Additionally, if Zillow faces financial pressure from multiple suits simultaneously, it might settle one or more cases early to reduce legal costs and uncertainty. The Redfin/Zillow rental deal that triggered the FTC suit is a specific transaction that could be unwound as a remedy, making negotiation more concrete.

Federal court calendars are backlogged and complex IP/antitrust cases are slow. CoStar filed in July 2025 — by end of 2026 that's only 18 months. In that time, most cases are still in discovery. The FTC case filed September 2025 is only 15 months old by year-end. A preliminary injunction hearing is the most likely vehicle for an early ruling, but CoStar would need to demonstrate irreparable harm from ongoing copyright infringement, which is a high evidentiary bar.

Taking the most skeptical view: these lawsuits appear to be more of a competitive strategy tool than a near-term resolution play. CoStar's management language ('Zillow is under siege') suggests the lawsuits serve a narrative purpose as much as a legal one — they don't need to win quickly, they need to create competitive uncertainty. Zillow has deep pockets and every incentive to drag proceedings out. The probability of a material favorable ruling in 2026 is very low.

The AG suits joining the FTC action add political pressure that could accelerate proceedings. State AGs facing election pressure sometimes push for faster resolutions. If multiple states are involved, the combined political and regulatory pressure on Zillow increases. However, even this scenario more likely results in a consent decree in 2027 rather than 2026. The 'by end of 2026' deadline is simply too tight for the current litigation stage.

Federal litigation base rates are clear: material rulings within 18 months of filing are rare for complex commercial cases. Low probability regardless of merits.

FTC is the wild card — government enforcement can move faster than private litigation. But even FTC cases typically take 2+ years. Settlement is the most likely path to early resolution, but Zillow has no incentive to settle quickly.

Five suits simultaneously creates more pressure than any single case, which marginally increases settlement probability. But 'material ruling' is a high bar — procedural rulings don't count. The probability is in the 12-18% range.