ANTSX vs. VFSAX

Last updated Jun 23, 2026

ANTSX (American Century International Small-Mid Cap Fund) and VFSAX (Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares) are both Foreign Small & Mid Cap Equities funds. Over the past 5 years, ANTSX returned 2.51%/yr vs 6.34%/yr for VFSAX. Their correlation of 0.92 suggests significant overlap in exposure. ANTSX charges 1.44%/yr vs 0.16%/yr for VFSAX.

Performance

ANTSX vs. VFSAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century International Small-Mid Cap Fund (ANTSX) and Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares (VFSAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ANTSX achieves a 9.86% return, which is significantly lower than VFSAX's 10.38% return.

ANTSX

• 1D: 0.70%
• 1M: -0.23%
• YTD: 9.86%
• 6M: 9.58%
• 1Y: 23.38%
• 3Y*: 12.54%
• 5Y*: 2.51%
• 10Y*: 7.16%

VFSAX

• 1D: 0.42%
• 1M: -0.55%
• YTD: 10.38%
• 6M: 10.91%
• 1Y: 26.34%
• 3Y*: 15.56%
• 5Y*: 6.34%
• 10Y*: —

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

ANTSX vs. VFSAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
ANTSX American Century International Small-Mid Cap Fund	9.86%	27.36%	3.22%	3.60%	-28.33%	13.30%	30.28%	14.02%
VFSAX Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares	10.38%	29.89%	2.58%	15.13%	-21.30%	12.68%	11.90%	13.47%

Correlation

The correlation between ANTSX and VFSAX is 0.91, 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	0.91
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (All Time) Calculated using the full available price history since Feb 7, 2019	0.92

The correlation between ANTSX and VFSAX has been stable across timeframes, ranging from 0.91 to 0.93 - a consistent structural relationship.

Return for Risk

ANTSX vs. VFSAX — Risk / Return Rank

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

ANTSX

ANTSX Risk / Return Rank: 22
ANTSX Sharpe Ratio Rank: 22
ANTSX Sortino Ratio Rank: 22
ANTSX Omega Ratio Rank: 22
ANTSX Calmar Ratio Rank: 20
ANTSX Martin Ratio Rank: 24

VFSAX

VFSAX Risk / Return Rank: 42
VFSAX Sharpe Ratio Rank: 44
VFSAX Sortino Ratio Rank: 41
VFSAX Omega Ratio Rank: 44
VFSAX Calmar Ratio Rank: 38
VFSAX Martin Ratio Rank: 40

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.

ANTSX vs. VFSAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century International Small-Mid Cap Fund (ANTSX) and Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares (VFSAX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	ANTSX	VFSAX	Difference
Sharpe ratio: Return per unit of total volatility	1.26	1.81	-0.55
Sortino ratio: Return per unit of downside risk	1.83	2.50	-0.67
Omega ratio: Gain probability vs. loss probability	1.23	1.33	-0.10
Calmar ratio: Return relative to maximum drawdown	1.51	2.21	-0.70
Martin ratio: Return relative to average drawdown	5.54	8.26	-2.71

ANTSX vs. VFSAX - Sharpe Ratio Comparison

The current ANTSX Sharpe Ratio is 1.26, which is lower than the VFSAX Sharpe Ratio of 1.81. The chart below compares the historical Sharpe Ratios of ANTSX and VFSAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

ANTSX vs. VFSAX - Drawdown Comparison

The maximum ANTSX drawdown since its inception was -43.68%, which is greater than VFSAX's maximum drawdown of -39.86%. Use the drawdown chart below to compare losses from any high point for ANTSX and VFSAX.

Drawdown Indicators

	ANTSX	VFSAX	Difference
Max Drawdown Largest peak-to-trough decline	-43.68%	-39.86%	-3.82%
Max Drawdown (1Y) Largest decline over 1 year	-14.83%	-11.48%	-3.35%
Max Drawdown (3Y) Largest decline over 3 years	-21.24%	-14.73%	-6.51%
Max Drawdown (5Y) Largest decline over 5 years	-40.28%	-33.81%	-6.47%
Max Drawdown (10Y) Largest decline over 10 years	-43.68%	—	—
Current Drawdown Current decline from peak	-2.71%	-2.27%	-0.44%
Average Drawdown Average peak-to-trough decline	-14.52%	-9.21%	-5.31%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.04%	3.07%	+0.97%

Volatility

ANTSX vs. VFSAX - Volatility Comparison

American Century International Small-Mid Cap Fund (ANTSX) has a higher volatility of 6.15% compared to Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares (VFSAX) at 5.45%. This indicates that ANTSX's price experiences larger fluctuations and is considered to be riskier than VFSAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ANTSX	VFSAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.15%	5.45%	+0.70%
Volatility (6M) Calculated over the trailing 6-month period	15.28%	12.10%	+3.18%
Volatility (1Y) Calculated over the trailing 1-year period	17.84%	14.03%	+3.81%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.85%	15.15%	+3.70%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.86%	17.06%	+1.80%

ANTSX vs. VFSAX - Expense Ratio Comparison

ANTSX has a 1.44% expense ratio, which is higher than VFSAX's 0.16% expense ratio.

Dividends

ANTSX vs. VFSAX - Dividend Comparison

ANTSX's dividend yield for the trailing twelve months is around 1.63%, less than VFSAX's 3.09% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
ANTSX American Century International Small-Mid Cap Fund	1.63%	1.79%	1.62%	1.10%	0.00%	21.47%	3.16%	1.69%	15.05%	4.40%
VFSAX Vanguard FTSE All-World ex-US Small-Cap Index Fund Admiral Shares	3.09%	3.31%	3.36%	3.06%	2.22%	2.67%	1.85%	3.19%	0.00%	0.00%

Frequently Asked Questions

Can I hold both ANTSX and VFSAX in my portfolio?

With a correlation of 0.91, ANTSX and VFSAX 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, ANTSX or VFSAX?

ANTSX has higher volatility (6.15%) compared to VFSAX (5.45%). In terms of maximum drawdown, ANTSX dropped -43.68% vs VFSAX's -39.86%.

Which has better risk-adjusted returns?

VFSAX currently has the higher Sharpe Ratio (1.81 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.