TWCIX vs. TWCGX

Last updated Aug 2, 2026

TWCIX (American Century Select Fund) and TWCGX (American Century Growth Fund Investor Class) are both Large Cap Growth Equities funds from American Century. Over the past 10 years, TWCIX returned 15.27%/yr vs 15.62%/yr for TWCGX. Their correlation of 0.93 means they have usually moved in the same direction. TWCIX charges 0.94%/yr vs 0.96%/yr for TWCGX.

Performance

TWCIX vs. TWCGX - Performance Comparison

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

Returns By Period

In the year-to-date period, TWCIX achieves a -1.01% return, which is significantly lower than TWCGX's 0.88% return. Both investments have delivered pretty close results over the past 10 years, with TWCIX having a 15.27% annualized return and TWCGX not far ahead at 15.62%.

TWCIX

• 1D: 2.34%
• 1M: -3.66%
• 6M: -0.77%
• YTD: -1.01%
• 1Y: 10.45%
• 3Y*: 14.99%
• 5Y*: 9.27%
• 10Y*: 15.27%
• ALL TIME*: 11.11%

TWCGX

• 1D: 2.83%
• 1M: -2.81%
• 6M: 2.63%
• YTD: 0.88%
• 1Y: 10.86%
• 3Y*: 16.43%
• 5Y*: 9.41%
• 10Y*: 15.62%
• ALL TIME*: 11.53%

*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)
TWCGX American Century Growth Fund Investor Class	$0.00	$0.00	$0.00
TWCIX American Century Select Fund	$0.00	$0.00	$0.00

TWCIX vs. TWCGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWCIX American Century Select Fund	-1.01%	16.30%	26.15%	39.93%	-28.82%	25.47%	33.99%	36.30%	-3.54%	28.90%
TWCGX American Century Growth Fund Investor Class	0.88%	15.28%	26.20%	43.31%	-31.39%	27.86%	35.23%	35.39%	-1.27%	30.06%

Correlation

The correlation between TWCIX and TWCGX is 0.98 - they have historically moved very closely together. At this level, their price movements offset little of one another.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.98
Correlation (3Y) Balances recent behavior with more history.	0.98
Correlation (5Y) Shows whether the relationship held over a longer period.	0.99
Correlation (10Y) Provides a long-term view across more market conditions.	0.98
Correlation (All Time) Calculated using the full available price history since Jan 2, 1980	0.93

The correlation between TWCIX and TWCGX has been stable across timeframes, ranging from 0.93 to 0.99 - a consistent structural relationship.

Return for Risk

TWCIX vs. TWCGX — 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: 14

TWCGX

TWCGX Risk / Return Rank: 13
TWCGX Sharpe Ratio Rank: 14
TWCGX Sortino Ratio Rank: 14
TWCGX Omega Ratio Rank: 14
TWCGX Calmar Ratio Rank: 12
TWCGX Martin Ratio Rank: 13

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. TWCGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Select Fund (TWCIX) and American Century Growth Fund Investor Class (TWCGX). 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	TWCGX	Difference
Sharpe ratio: Return per unit of total volatility	0.47	0.51	-0.04
Sortino ratio: Return per unit of downside risk	0.76	0.81	-0.06
Omega ratio: Gain probability vs. loss probability	1.09	1.10	-0.01
Calmar ratio: Return relative to maximum drawdown	0.57	0.53	+0.04
Martin ratio: Return relative to average drawdown	1.80	1.60	+0.19

TWCIX vs. TWCGX - Sharpe Ratio Comparison

The current TWCIX Sharpe Ratio is 0.47, which is comparable to the TWCGX Sharpe Ratio of 0.51. The chart below compares the historical Sharpe Ratios of TWCIX and TWCGX, 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. TWCGX - Drawdown Comparison

The maximum TWCIX drawdown since its inception was -57.31%, roughly equal to the maximum TWCGX drawdown of -59.60%. Use the drawdown chart below to compare losses from any high point for TWCIX and TWCGX.

Drawdown Indicators

	TWCIX	TWCGX	Difference
Max Drawdown Largest peak-to-trough decline	-57.31%	-59.60%	+2.29%
Max Drawdown (1Y) Largest decline over 1 year	-14.66%	-16.69%	+2.03%
Max Drawdown (3Y) Largest decline over 3 years	-23.88%	-24.20%	+0.32%
Max Drawdown (5Y) Largest decline over 5 years	-31.24%	-34.92%	+3.68%
Max Drawdown (10Y) Largest decline over 10 years	-31.24%	-34.92%	+3.68%
Current Drawdown Current decline from peak	-9.38%	-7.56%	-1.82%
Average Drawdown Average peak-to-trough decline	-12.37%	-15.26%	+2.89%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.64%	5.51%	-0.87%

Volatility

TWCIX vs. TWCGX - Volatility Comparison

American Century Select Fund (TWCIX) and American Century Growth Fund Investor Class (TWCGX) have volatilities of 5.66% and 5.53%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWCIX	TWCGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.66%	5.53%	+0.13%
Volatility (6M) Calculated over the trailing 6-month period	14.10%	13.84%	+0.26%
Volatility (1Y) Calculated over the trailing 1-year period	17.75%	17.44%	+0.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.76%	21.84%	-0.08%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.15%	21.41%	-0.26%

TWCIX vs. TWCGX - Expense Ratio Comparison

TWCIX has a 0.94% expense ratio, which is lower than TWCGX's 0.96% expense ratio.

Dividends

TWCIX vs. TWCGX - Dividend Comparison

TWCIX's dividend yield for the trailing twelve months is around 10.14%, less than TWCGX's 16.99% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TWCGX American Century Growth Fund Investor Class	16.99%	17.14%	5.96%	4.81%	4.86%	9.83%	5.33%	5.60%	14.07%	10.28%	4.64%	6.80%
TWCIX American Century Select Fund	10.14%	10.04%	3.67%	5.21%	10.36%	8.25%	6.26%	5.42%	9.05%	6.30%	3.43%	6.16%

Frequently Asked Questions

Can I hold both TWCIX and TWCGX in my portfolio?

With a correlation of 0.98, TWCIX and TWCGX 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 TWCGX?

TWCIX has higher volatility (5.66%) compared to TWCGX (5.53%). In terms of maximum drawdown, TWCIX dropped -57.31% vs TWCGX's -59.60%.

Which has better risk-adjusted returns?

TWCGX currently has the higher Sharpe Ratio (0.51 vs 0.47), 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.