ANOIX vs. ^GSPC

Last updated Jun 3, 2026

ANOIX (American Century Small Cap Growth Fund) is Small Cap Growth Equities fund managed by American Century, while ^GSPC (S&P 500 Index) is an index. Over the past 10 years, ANOIX returned 13.58%/yr vs 13.75%/yr for ^GSPC. Their correlation of 0.83 suggests significant overlap in exposure.

Performance

ANOIX vs. ^GSPC - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Small Cap Growth Fund (ANOIX) and S&P 500 Index (^GSPC). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with ANOIX having a 11.05% return and ^GSPC slightly higher at 11.16%. Both investments have delivered pretty close results over the past 10 years, with ANOIX having a 13.58% annualized return and ^GSPC not far ahead at 13.75%.

ANOIX

• 1D: -0.54%
• 1M: 4.10%
• YTD: 11.05%
• 6M: 11.28%
• 1Y: 23.70%
• 3Y*: 14.67%
• 5Y*: 4.65%
• 10Y*: 13.58%

^GSPC

• 1D: 0.13%
• 1M: 5.25%
• YTD: 11.16%
• 6M: 11.43%
• 1Y: 28.20%
• 3Y*: 21.12%
• 5Y*: 12.66%
• 10Y*: 13.75%

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

ANOIX vs. ^GSPC - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ANOIX American Century Small Cap Growth Fund	11.05%	9.00%	14.90%	17.13%	-26.41%	7.80%	51.07%	36.75%	-4.84%	25.83%
^GSPC S&P 500 Index	11.16%	16.39%	23.31%	24.23%	-19.44%	26.89%	16.26%	28.88%	-6.24%	19.42%

Correlation

The correlation between ANOIX and ^GSPC is 0.81, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.81
Correlation (3Y) Calculated over the trailing 3-year period	0.80
Correlation (5Y) Calculated over the trailing 5-year period	0.83
Correlation (10Y) Calculated over the trailing 10-year period	0.82
Correlation (All Time) Calculated using the full available price history since Jun 1, 2001	0.84

The correlation between ANOIX and ^GSPC has been stable across timeframes, ranging from 0.80 to 0.83 - a consistent structural relationship.

Return for Risk

ANOIX vs. ^GSPC — Risk / Return Rank

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

ANOIX

ANOIX Risk / Return Rank: 23
ANOIX Sharpe Ratio Rank: 18
ANOIX Sortino Ratio Rank: 19
ANOIX Omega Ratio Rank: 17
ANOIX Calmar Ratio Rank: 27
ANOIX Martin Ratio Rank: 32

^GSPC

^GSPC Risk / Return Rank: 79
^GSPC Sharpe Ratio Rank: 76
^GSPC Sortino Ratio Rank: 76
^GSPC Omega Ratio Rank: 77
^GSPC Calmar Ratio Rank: 79
^GSPC Martin Ratio Rank: 88

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.

ANOIX vs. ^GSPC - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Small Cap Growth Fund (ANOIX) 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.

	ANOIX	^GSPC	Difference
Sharpe ratio Return per unit of total volatility	1.26	2.39	-1.13
Sortino ratio Return per unit of downside risk	1.88	3.25	-1.37
Omega ratio Gain probability vs. loss probability	1.22	1.43	-0.21
Calmar ratio Return relative to maximum drawdown	1.99	3.16	-1.17
Martin ratio Return relative to average drawdown	7.50	14.61	-7.12
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ANOIX vs. ^GSPC - Sharpe Ratio Comparison

The current ANOIX Sharpe Ratio is 1.26, which is lower than the ^GSPC Sharpe Ratio of 2.39. The chart below compares the historical Sharpe Ratios of ANOIX 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

	ANOIX	^GSPC	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.26	2.39	-1.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.20	0.75	-0.55
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.59	0.76	-0.18
Sharpe Ratio (All Time) Calculated using the full available price history	0.42	0.47	-0.05

Drawdowns

ANOIX vs. ^GSPC - Drawdown Comparison

The maximum ANOIX drawdown since its inception was -59.47%, roughly equal to the maximum ^GSPC drawdown of -56.78%. Use the drawdown chart below to compare losses from any high point for ANOIX and ^GSPC.

Drawdown Indicators

	ANOIX	^GSPC	Difference
Max Drawdown Largest peak-to-trough decline	-59.47%	-56.78%	-2.69%
Max Drawdown (1Y) Largest decline over 1 year	-12.49%	-9.10%	-3.39%
Max Drawdown (3Y) Largest decline over 3 years	-25.57%	-18.90%	-6.67%
Max Drawdown (5Y) Largest decline over 5 years	-37.15%	-25.43%	-11.72%
Max Drawdown (10Y) Largest decline over 10 years	-39.07%	-33.92%	-5.15%
Current Drawdown Current decline from peak	-1.15%	0.00%	-1.15%
Average Drawdown Average peak-to-trough decline	-11.99%	-10.72%	-1.27%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.31%	1.97%	+1.34%

Volatility

ANOIX vs. ^GSPC - Volatility Comparison

American Century Small Cap Growth Fund (ANOIX) has a higher volatility of 6.31% compared to S&P 500 Index (^GSPC) at 2.84%. This indicates that ANOIX'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

	ANOIX	^GSPC	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.31%	2.84%	+3.47%
Volatility (6M) Calculated over the trailing 6-month period	15.02%	8.98%	+6.04%
Volatility (1Y) Calculated over the trailing 1-year period	19.86%	11.87%	+7.99%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.93%	16.90%	+6.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.31%	18.07%	+5.24%

Frequently Asked Questions

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

ANOIX and ^GSPC have a correlation of 0.81, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ANOIX or ^GSPC?

ANOIX has higher volatility (6.31%) compared to ^GSPC (2.84%). In terms of maximum drawdown, ANOIX dropped -59.47% vs ^GSPC's -56.78%.

Which has better risk-adjusted returns?

^GSPC currently has the higher Sharpe Ratio (2.39 vs 1.26), 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.