CSGP vs. ^GSPC

Last updated Jun 4, 2026

CSGP (CoStar Group, Inc.) is a stock, while ^GSPC (S&P 500 Index) is an index. Over the past 10 years, CSGP returned 4.87%/yr vs 13.66%/yr for ^GSPC. At a 0.49 correlation, their price movements are largely independent.

Performance

CSGP vs. ^GSPC - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in CoStar Group, Inc. (CSGP) and S&P 500 Index (^GSPC). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CSGP achieves a -50.33% return, which is significantly lower than ^GSPC's 10.35% return. Over the past 10 years, CSGP has underperformed ^GSPC with an annualized return of 4.87%, while ^GSPC has yielded a comparatively higher 13.66% annualized return.

CSGP

• 1D: -0.77%
• 1M: -5.60%
• YTD: -50.33%
• 6M: -51.61%
• 1Y: -55.87%
• 3Y*: -25.84%
• 5Y*: -16.86%
• 10Y*: 4.87%

^GSPC

• 1D: -0.74%
• 1M: 4.90%
• YTD: 10.35%
• 6M: 10.28%
• 1Y: 26.52%
• 3Y*: 20.83%
• 5Y*: 12.30%
• 10Y*: 13.66%

*Multi-year figures are annualized to reflect compound growth (CAGR)

CSGP vs. ^GSPC - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CSGP CoStar Group, Inc.	-50.33%	-6.08%	-18.08%	13.08%	-2.21%	-14.50%	54.48%	77.36%	13.60%	57.54%
^GSPC S&P 500 Index	10.35%	16.39%	23.31%	24.23%	-19.44%	26.89%	16.26%	28.88%	-6.24%	19.42%

Correlation

The correlation between CSGP and ^GSPC is 0.20, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.20
Correlation (3Y) Calculated over the trailing 3-year period	0.41
Correlation (5Y) Calculated over the trailing 5-year period	0.52
Correlation (10Y) Calculated over the trailing 10-year period	0.54
Correlation (All Time) Calculated using the full available price history since Jul 2, 1998	0.49

Over the past year, the correlation between CSGP and ^GSPC has dropped to 0.20 - well below their long-term average of 0.49, suggesting their price drivers have been diverging.

Return for Risk

CSGP vs. ^GSPC — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

CSGP

CSGP Risk / Return Rank: 4
CSGP Sharpe Ratio Rank: 1
CSGP Sortino Ratio Rank: 1
CSGP Omega Ratio Rank: 1
CSGP Calmar Ratio Rank: 9
CSGP Martin Ratio Rank: 6

^GSPC

^GSPC Risk / Return Rank: 73
^GSPC Sharpe Ratio Rank: 71
^GSPC Sortino Ratio Rank: 71
^GSPC Omega Ratio Rank: 72
^GSPC Calmar Ratio Rank: 67
^GSPC Martin Ratio Rank: 81

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

CSGP vs. ^GSPC - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for CoStar Group, Inc. (CSGP) and S&P 500 Index (^GSPC). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

	CSGP	^GSPC	Difference
Sharpe ratio: Return per unit of total volatility	-1.45	2.24	-3.69
Sortino ratio: Return per unit of downside risk	-2.25	3.07	-5.33
Omega ratio: Gain probability vs. loss probability	0.69	1.41	-0.71
Calmar ratio: Return relative to maximum drawdown	-0.83	2.93	-3.76
Martin ratio: Return relative to average drawdown	-1.47	13.52	-14.99
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CSGP vs. ^GSPC - Sharpe Ratio Comparison

The current CSGP Sharpe Ratio is -1.45, which is lower than the ^GSPC Sharpe Ratio of 2.24. The chart below compares the historical Sharpe Ratios of CSGP and ^GSPC, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	CSGP	^GSPC	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-1.45	2.24	-3.69
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.49	0.73	-1.22
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.15	0.76	-0.61
Sharpe Ratio (All Time) Calculated using the full available price history	0.31	0.47	-0.16

Drawdowns

CSGP vs. ^GSPC - Drawdown Comparison

The maximum CSGP drawdown since its inception was -71.11%, which is greater than ^GSPC's maximum drawdown of -56.78%. Use the drawdown chart below to compare losses from any high point for CSGP and ^GSPC.

Drawdown Indicators

	CSGP	^GSPC	Difference
Max Drawdown Largest peak-to-trough decline	-71.11%	-56.78%	-14.33%
Max Drawdown (1Y) Largest decline over 1 year	-67.11%	-9.10%	-58.01%
Max Drawdown (3Y) Largest decline over 3 years	-67.41%	-18.90%	-48.51%
Max Drawdown (5Y) Largest decline over 5 years	-68.07%	-25.43%	-42.64%
Max Drawdown (10Y) Largest decline over 10 years	-68.07%	-33.92%	-34.15%
Current Drawdown Current decline from peak	-66.51%	-0.74%	-65.77%
Average Drawdown Average peak-to-trough decline	-22.24%	-10.72%	-11.52%
Ulcer Index Depth and duration of drawdowns from previous peaks	37.96%	1.97%	+35.99%

Volatility

CSGP vs. ^GSPC - Volatility Comparison

CoStar Group, Inc. (CSGP) has a higher volatility of 11.46% compared to S&P 500 Index (^GSPC) at 2.93%. This indicates that CSGP's price experiences larger fluctuations and is considered to be riskier than ^GSPC based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CSGP	^GSPC	Difference
Volatility (1M) Calculated over the trailing 1-month period	11.46%	2.93%	+8.53%
Volatility (6M) Calculated over the trailing 6-month period	33.87%	8.99%	+24.88%
Volatility (1Y) Calculated over the trailing 1-year period	38.74%	11.89%	+26.85%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	34.65%	16.90%	+17.75%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	32.61%	18.06%	+14.55%

Frequently Asked Questions

Can I hold both CSGP and ^GSPC in my portfolio?

CSGP and ^GSPC have a correlation of 0.20, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CSGP or ^GSPC?

CSGP has higher volatility (11.46%) compared to ^GSPC (2.93%). In terms of maximum drawdown, CSGP dropped -71.11% vs ^GSPC's -56.78%.

Which has better risk-adjusted returns?

^GSPC currently has the higher Sharpe Ratio (2.24 vs -1.45), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.