CSGP vs ZG: Correlation
How closely do CoStar Group (CSGP) and Zillow Group, Inc. (ZG) trade together? Their weekly returns over three years give a correlation of 0.44, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CSGP and ZG?
On 3 years of weekly data the CSGP/ZG correlation comes out at 0.44, moderate. The past 12 months show a tighter link (0.62) than the 3-year average (0.44). The 5-year figure is 0.43, and annualized covariance runs at 759.6 %².
Among the 34 assets we track against CSGP, ZG ranks #15 by 3-year correlation. The trailing year gives ZG the advantage: -65.0% versus -55.5%, a 9.5-point spread.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
CSGP vs ZG: side by side
| CSGP (CoStar Group) | ZG (Zillow Group, Inc.) | |
|---|---|---|
| 1-year return | -65.0% | -55.5% |
| 5-year return | -62.7% | -62.1% |
| Volatility (ann.) | 36.5% | 46.8% |
| Beta vs S&P 500 | 0.86 | 1.28 |
| Max drawdown (3Y) | -72.2% | -66.4% |
| Market cap | $12.7B | $8.2B |
| P/E (trailing) | 174.1 | 158.0 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | Real Estate | US Listed |
Year-by-year returns
| Year | CSGP | ZG |
|---|---|---|
| 2022 | -2.2% | -49.8% |
| 2023 | +13.1% | +81.7% |
| 2024 | -18.1% | +24.9% |
| 2025 | -6.1% | -3.7% |
| 2026 | -53.4% | -46.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CSGP and ZG good diversifiers for each other?
Reasonably. At 0.44, CSGP and ZG keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between CSGP and ZG?
Using weekly returns as of 2026-08-27: 0.44 over 3 years, with 0.62 over the last year and 0.43 over 5 years.
Is ZG a good diversifier for CSGP?
Reasonably. At 0.44, CSGP and ZG keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.44 mean?
On the −1 to +1 scale, 0.44 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
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Related comparisons
Hubs: CSGP correlations · ZG correlations
