CoStar Group vs Zillow
CoStar Group reported revenue of $3.2 billion in fiscal 2025, 1.3 times Zillow's $2.6 billion in fiscal 2025. CoStar Group's revenue grew 18.7% in its latest year, and Zillow's grew 15.5%. CoStar Group had an operating margin of -2.2%, against -1.3% at Zillow. Free cash flow was $123 million at CoStar Group and $235 million at Zillow.
Side by side
| CoStar Group | Zillow | |
|---|---|---|
| Latest fiscal year | FY2025, Dec 31, 2025 | FY2025, Dec 31, 2025 |
| Revenue | $3.2B | $2.6B |
| Revenue growth | 18.7% | 15.5% |
| Revenue growth a year, last 5 years | 14.4% | 9.7% |
| Gross margin | 78.9% | 74.1% |
| Operating margin | −2.2% | −1.3% |
| Net margin | 0.2% | 0.9% |
| Free cash flow | $123M | $235M |
| Free cash flow margin | 3.8% | 9.1% |
| Return on capital | −0.6% | −0.9% |
| Net debt to EBITDA | −3.3x | −5.6x |
| Dividends and buybacks | $500M | $670M |
| Change in diluted share count | 3.2% | 8.6% |
| Last close | $33.70 | $33.73 |
| P/E at the last close | 187.2× | 153.3× |
| Insider trades, last 12 months | bought $8.5 million, sold $534,282 | sold $14.6 million |
| Piotroski F-score | 5 of 9 | 7 of 9 |
Amounts in each company's own currency, US$ unless marked (a foreign company may report in another), each company's latest fiscal year from its 10-K, or 20-F or 40-F for a foreign company. Growth rates compare with the year before; the five-year rate is the average a year. Free cash flow is cash from operations minus capital spending; return on capital is after-tax operating income over the money invested in the business; P/E is the last close over the latest earnings per share. Banks are measured differently (return on equity, efficiency ratio), so some rows apply to one company only.
Ten years
Revenue
US$ billions, fiscal years
CoStar GroupZillow
Operating margin
Percent of revenue
CoStar GroupZillow
Free cash flow
US$ billions. Cash from operations minus capital expenditure.
CoStar GroupZillow
Source: the companies' Form 10-K filings, from SEC EDGAR, and the last close. For information only, not investment advice: the figures describe results, not which company is the better investment. The Filing Desk is not affiliated with either company. Full figures on the CoStar Group and Zillow pages.