ANOIX vs. VSGIX

Last updated Jun 5, 2026

ANOIX (American Century Small Cap Growth Fund) and VSGIX (Vanguard Small-Cap Growth Index Fund Institutional Shares) are both Small Cap Growth Equities funds. Over the past 10 years, ANOIX returned 13.57%/yr vs 11.74%/yr for VSGIX. With a 0.96 correlation, they move nearly in lockstep. ANOIX charges 1.17%/yr vs 0.06%/yr for VSGIX.

Performance

ANOIX vs. VSGIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Small Cap Growth Fund (ANOIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ANOIX achieves a 10.96% return, which is significantly lower than VSGIX's 17.48% return. Over the past 10 years, ANOIX has outperformed VSGIX with an annualized return of 13.57%, while VSGIX has yielded a comparatively lower 11.74% annualized return.

ANOIX

• 1D: -0.21%
• 1M: 1.01%
• YTD: 10.96%
• 6M: 9.17%
• 1Y: 21.45%
• 3Y*: 14.64%
• 5Y*: 4.70%
• 10Y*: 13.57%

VSGIX

• 1D: -1.06%
• 1M: 3.65%
• YTD: 17.48%
• 6M: 15.70%
• 1Y: 32.16%
• 3Y*: 17.72%
• 5Y*: 5.71%
• 10Y*: 11.74%

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

ANOIX vs. VSGIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ANOIX American Century Small Cap Growth Fund	10.96%	9.00%	14.90%	17.13%	-26.41%	7.80%	51.07%	36.75%	-4.84%	25.83%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	17.48%	8.44%	14.95%	23.07%	-28.39%	5.70%	35.29%	32.77%	-5.70%	21.94%

Correlation

The correlation between ANOIX and VSGIX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Jun 1, 2001	0.96

The correlation between ANOIX and VSGIX has been stable across timeframes, ranging from 0.94 to 0.97 - a consistent structural relationship.

Return for Risk

ANOIX vs. VSGIX — Risk / Return Rank

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

ANOIX

ANOIX Risk / Return Rank: 20
ANOIX Sharpe Ratio Rank: 16
ANOIX Sortino Ratio Rank: 17
ANOIX Omega Ratio Rank: 15
ANOIX Calmar Ratio Rank: 23
ANOIX Martin Ratio Rank: 28

VSGIX

VSGIX Risk / Return Rank: 41
VSGIX Sharpe Ratio Rank: 34
VSGIX Sortino Ratio Rank: 32
VSGIX Omega Ratio Rank: 30
VSGIX Calmar Ratio Rank: 57
VSGIX Martin Ratio Rank: 54

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. VSGIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Small Cap Growth Fund (ANOIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). 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	VSGIX	Difference
Sharpe ratio: Return per unit of total volatility	1.11	1.69	-0.58
Sortino ratio: Return per unit of downside risk	1.69	2.36	-0.66
Omega ratio: Gain probability vs. loss probability	1.20	1.29	-0.09
Calmar ratio: Return relative to maximum drawdown	1.76	2.89	-1.12
Martin ratio: Return relative to average drawdown	6.63	11.00	-4.37
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. VSGIX - Sharpe Ratio Comparison

The current ANOIX Sharpe Ratio is 1.11, which is lower than the VSGIX Sharpe Ratio of 1.69. The chart below compares the historical Sharpe Ratios of ANOIX and VSGIX, 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	VSGIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.11	1.69	-0.58
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.21	0.24	-0.04
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.58	0.51	+0.07
Sharpe Ratio (All Time) Calculated using the full available price history	0.42	0.40	+0.02

Drawdowns

ANOIX vs. VSGIX - Drawdown Comparison

The maximum ANOIX drawdown since its inception was -59.47%, roughly equal to the maximum VSGIX drawdown of -58.66%. Use the drawdown chart below to compare losses from any high point for ANOIX and VSGIX.

Drawdown Indicators

	ANOIX	VSGIX	Difference
Max Drawdown Largest peak-to-trough decline	-59.47%	-58.66%	-0.81%
Max Drawdown (1Y) Largest decline over 1 year	-12.49%	-11.38%	-1.11%
Max Drawdown (3Y) Largest decline over 3 years	-25.57%	-27.47%	+1.90%
Max Drawdown (5Y) Largest decline over 5 years	-37.15%	-38.36%	+1.21%
Max Drawdown (10Y) Largest decline over 10 years	-39.07%	-38.70%	-0.37%
Current Drawdown Current decline from peak	-1.23%	-1.06%	-0.17%
Average Drawdown Average peak-to-trough decline	-11.99%	-11.33%	-0.66%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.31%	2.98%	+0.33%

Volatility

ANOIX vs. VSGIX - Volatility Comparison

American Century Small Cap Growth Fund (ANOIX) has a higher volatility of 6.30% compared to Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) at 5.45%. This indicates that ANOIX's price experiences larger fluctuations and is considered to be riskier than VSGIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ANOIX	VSGIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.30%	5.45%	+0.85%
Volatility (6M) Calculated over the trailing 6-month period	14.92%	14.85%	+0.07%
Volatility (1Y) Calculated over the trailing 1-year period	19.81%	19.48%	+0.33%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.93%	23.56%	-0.63%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.30%	22.98%	+0.32%

ANOIX vs. VSGIX - Expense Ratio Comparison

ANOIX has a 1.17% expense ratio, which is higher than VSGIX's 0.06% expense ratio.

Dividends

ANOIX vs. VSGIX - Dividend Comparison

ANOIX's dividend yield for the trailing twelve months is around 6.85%, more than VSGIX's 0.45% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ANOIX American Century Small Cap Growth Fund	6.85%	7.60%	0.11%	0.00%	0.00%	21.29%	11.07%	5.50%	16.59%	3.93%	0.00%	0.00%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	0.45%	0.55%	0.55%	0.68%	0.56%	0.37%	0.45%	0.58%	0.80%	0.82%	1.09%	0.98%

Frequently Asked Questions

Can I hold both ANOIX and VSGIX in my portfolio?

With a correlation of 0.94, ANOIX and VSGIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, ANOIX or VSGIX?

ANOIX has higher volatility (6.30%) compared to VSGIX (5.45%). In terms of maximum drawdown, ANOIX dropped -59.47% vs VSGIX's -58.66%.

Which has better risk-adjusted returns?

VSGIX currently has the higher Sharpe Ratio (1.69 vs 1.11), 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.