TWCIX vs. VFINX

Last updated Aug 4, 2026

TWCIX (American Century Select Fund) and VFINX (Vanguard 500 Index Fund Investor Shares) are both mutual funds - TWCIX is a Large Cap Growth Equities fund managed by American Century, while VFINX is a Large Cap Blend Equities fund tracking the S&P 500 Index. Over the past 10 years, TWCIX returned 15.58%/yr vs 15.00%/yr for VFINX. Their correlation of 0.90 means they have usually moved in the same direction. TWCIX charges 0.94%/yr vs 0.14%/yr for VFINX.

Performance

TWCIX vs. VFINX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Select Fund (TWCIX) and Vanguard 500 Index Fund Investor Shares (VFINX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TWCIX achieves a 1.09% return, which is significantly lower than VFINX's 10.04% return. Both investments have delivered pretty close results over the past 10 years, with TWCIX having a 15.58% annualized return and VFINX not far behind at 15.00%.

TWCIX

• 1D: 2.12%
• 1M: -1.62%
• 6M: 1.03%
• YTD: 1.09%
• 1Y: 12.79%
• 3Y*: 15.96%
• 5Y*: 9.73%
• 10Y*: 15.58%
• ALL TIME*: 11.15%

VFINX

• 1D: 0.71%
• 1M: 0.13%
• 6M: 7.90%
• YTD: 10.04%
• 1Y: 21.33%
• 3Y*: 19.26%
• 5Y*: 12.69%
• 10Y*: 15.00%
• ALL TIME*: 10.69%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
TWCIX American Century Select Fund	$0.00	$0.00	$0.00
VFINX Vanguard 500 Index Fund Investor Shares	$0.00	$0.00	$0.00

TWCIX vs. VFINX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWCIX American Century Select Fund	1.09%	16.30%	26.15%	39.93%	-28.82%	25.47%	33.99%	36.30%	-3.54%	28.90%
VFINX Vanguard 500 Index Fund Investor Shares	10.04%	17.71%	24.84%	26.12%	-18.24%	28.53%	18.20%	31.33%	-4.55%	21.66%

Correlation

The correlation between TWCIX and VFINX is 0.93, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.93
Correlation (3Y) Balances recent behavior with more history.	0.93
Correlation (5Y) Shows whether the relationship held over a longer period.	0.95
Correlation (10Y) Provides a long-term view across more market conditions.	0.93
Correlation (All Time) Calculated using the full available price history since Aug 31, 1976	0.90

The correlation between TWCIX and VFINX has been stable across timeframes, ranging from 0.90 to 0.95 - a consistent structural relationship.

Return for Risk

TWCIX vs. VFINX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

TWCIX

TWCIX Risk / Return Rank: 13
TWCIX Sharpe Ratio Rank: 13
TWCIX Sortino Ratio Rank: 13
TWCIX Omega Ratio Rank: 13
TWCIX Calmar Ratio Rank: 13
TWCIX Martin Ratio Rank: 15

VFINX

VFINX Risk / Return Rank: 58
VFINX Sharpe Ratio Rank: 55
VFINX Sortino Ratio Rank: 51
VFINX Omega Ratio Rank: 52
VFINX Calmar Ratio Rank: 60
VFINX Martin Ratio Rank: 73

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

TWCIX vs. VFINX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Select Fund (TWCIX) and Vanguard 500 Index Fund Investor Shares (VFINX). 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.

	TWCIX	VFINX	Difference
Sharpe ratio: Return per unit of total volatility	0.58	1.51	-0.94
Sortino ratio: Return per unit of downside risk	0.90	2.10	-1.20
Omega ratio: Gain probability vs. loss probability	1.11	1.27	-0.16
Calmar ratio: Return relative to maximum drawdown	0.70	2.18	-1.48
Martin ratio: Return relative to average drawdown	2.21	9.37	-7.17

TWCIX vs. VFINX - Sharpe Ratio Comparison

The current TWCIX Sharpe Ratio is 0.58, which is lower than the VFINX Sharpe Ratio of 1.51. The chart below compares the historical Sharpe Ratios of TWCIX and VFINX, 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

TWCIX vs. VFINX - Drawdown Comparison

The maximum TWCIX drawdown since its inception was -57.31%, roughly equal to the maximum VFINX drawdown of -55.25%. Use the drawdown chart below to compare losses from any high point for TWCIX and VFINX.

Drawdown Indicators

	TWCIX	VFINX	Difference
Max Drawdown Largest peak-to-trough decline	-57.31%	-55.25%	-2.06%
Max Drawdown (1Y) Largest decline over 1 year	-14.66%	-8.92%	-5.74%
Max Drawdown (3Y) Largest decline over 3 years	-23.88%	-18.76%	-5.12%
Max Drawdown (5Y) Largest decline over 5 years	-31.24%	-24.59%	-6.65%
Max Drawdown (10Y) Largest decline over 10 years	-31.24%	-33.83%	+2.59%
Current Drawdown Current decline from peak	-7.46%	-1.44%	-6.02%
Average Drawdown Average peak-to-trough decline	-12.37%	-8.26%	-4.11%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.67%	2.08%	+2.59%

Volatility

TWCIX vs. VFINX - Volatility Comparison

American Century Select Fund (TWCIX) has a higher volatility of 6.12% compared to Vanguard 500 Index Fund Investor Shares (VFINX) at 3.52%. This indicates that TWCIX's price experiences larger fluctuations and is considered to be riskier than VFINX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWCIX	VFINX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.12%	3.52%	+2.60%
Volatility (6M) Calculated over the trailing 6-month period	14.26%	10.11%	+4.15%
Volatility (1Y) Calculated over the trailing 1-year period	17.87%	12.87%	+5.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.78%	17.01%	+4.77%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.16%	18.07%	+3.09%

TWCIX vs. VFINX - Expense Ratio Comparison

TWCIX has a 0.94% expense ratio, which is higher than VFINX's 0.14% expense ratio.

Dividends

TWCIX vs. VFINX - Dividend Comparison

TWCIX's dividend yield for the trailing twelve months is around 9.93%, more than VFINX's 0.97% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TWCIX American Century Select Fund	9.93%	10.04%	3.67%	5.21%	10.36%	8.25%	6.26%	5.42%	9.05%	6.30%	3.43%	6.16%
VFINX Vanguard 500 Index Fund Investor Shares	0.97%	1.02%	1.14%	1.36%	1.57%	1.15%	1.45%	1.77%	1.94%	1.69%	1.92%	1.99%

Frequently Asked Questions

Can I hold both TWCIX and VFINX in my portfolio?

With a correlation of 0.93, TWCIX and VFINX 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, TWCIX or VFINX?

TWCIX has higher volatility (6.12%) compared to VFINX (3.52%). In terms of maximum drawdown, TWCIX dropped -57.31% vs VFINX's -55.25%.

Which has better risk-adjusted returns?

VFINX currently has the higher Sharpe Ratio (1.51 vs 0.58), 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.