Real Estate Market Volatility Risk: Zillow's business is highly dependent on the health and stability of the housing market, making it vulnerable to downturns in home sales, prices, or inventory, which could significantly impact revenue from advertising, mortgages, and other services.

Intense Competition Risk: Zillow faces significant competition from other online real estate platforms (e.g., Realtor.com, Redfin), traditional real estate brokers, and new entrants, which could lead to pricing pressure, reduced market share, or increased marketing expenses.

Reliance on Advertising Revenue Risk: A substantial portion of Zillow's revenue comes from advertising, particularly its Premier Agent program. A decrease in advertiser spending, changes in advertising effectiveness, or shifts in agent preferences could materially impact financial performance.