TWCUX vs. VPMCX

Last updated Jun 4, 2026

TWCUX (American Century Ultra Fund) and VPMCX (Vanguard PRIMECAP Fund Investor Shares) are both Large Cap Growth Equities funds. Over the past 10 years, TWCUX returned 18.29%/yr vs 17.57%/yr for VPMCX. Their correlation of 0.86 suggests significant overlap in exposure. TWCUX charges 0.93%/yr vs 0.38%/yr for VPMCX.

Performance

TWCUX vs. VPMCX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Ultra Fund (TWCUX) and Vanguard PRIMECAP Fund Investor Shares (VPMCX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TWCUX achieves a 9.68% return, which is significantly lower than VPMCX's 25.40% return. Both investments have delivered pretty close results over the past 10 years, with TWCUX having a 18.29% annualized return and VPMCX not far behind at 17.57%.

TWCUX

• 1D: -0.39%
• 1M: 6.24%
• YTD: 9.68%
• 6M: 8.02%
• 1Y: 25.64%
• 3Y*: 21.95%
• 5Y*: 13.04%
• 10Y*: 18.29%

VPMCX

• 1D: 0.35%
• 1M: 12.86%
• YTD: 25.40%
• 6M: 26.79%
• 1Y: 58.79%
• 3Y*: 28.00%
• 5Y*: 16.44%
• 10Y*: 17.57%

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

TWCUX vs. VPMCX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWCUX American Century Ultra Fund	9.68%	12.66%	29.54%	43.36%	-32.38%	23.47%	49.79%	34.60%	0.70%	31.65%
VPMCX Vanguard PRIMECAP Fund Investor Shares	25.40%	29.60%	13.23%	28.16%	-15.22%	21.64%	17.16%	27.78%	-1.99%	28.17%

Correlation

The correlation between TWCUX and VPMCX is 0.76, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.76
Correlation (3Y) Calculated over the trailing 3-year period	0.81
Correlation (5Y) Calculated over the trailing 5-year period	0.86
Correlation (10Y) Calculated over the trailing 10-year period	0.87
Correlation (All Time) Calculated using the full available price history since Nov 1, 1984	0.86

The correlation between TWCUX and VPMCX shifts across timeframes, from 0.76 (1 year) to 0.87 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

TWCUX vs. VPMCX — Risk / Return Rank

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

TWCUX

TWCUX Risk / Return Rank: 27
TWCUX Sharpe Ratio Rank: 32
TWCUX Sortino Ratio Rank: 29
TWCUX Omega Ratio Rank: 29
TWCUX Calmar Ratio Rank: 21
TWCUX Martin Ratio Rank: 23

VPMCX

VPMCX Risk / Return Rank: 94
VPMCX Sharpe Ratio Rank: 97
VPMCX Sortino Ratio Rank: 95
VPMCX Omega Ratio Rank: 91
VPMCX Calmar Ratio Rank: 93
VPMCX Martin Ratio Rank: 96

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.

TWCUX vs. VPMCX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Ultra Fund (TWCUX) and Vanguard PRIMECAP Fund Investor Shares (VPMCX). 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.

	TWCUX	VPMCX	Difference
Sharpe ratio: Return per unit of total volatility	1.62	3.75	-2.13
Sortino ratio: Return per unit of downside risk	2.23	5.04	-2.82
Omega ratio: Gain probability vs. loss probability	1.28	1.65	-0.37
Calmar ratio: Return relative to maximum drawdown	1.68	5.12	-3.44
Martin ratio: Return relative to average drawdown	5.89	23.59	-17.70
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TWCUX vs. VPMCX - Sharpe Ratio Comparison

The current TWCUX Sharpe Ratio is 1.62, which is lower than the VPMCX Sharpe Ratio of 3.75. The chart below compares the historical Sharpe Ratios of TWCUX and VPMCX, 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

	TWCUX	VPMCX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.62	3.75	-2.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.58	0.91	-0.32
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.83	0.92	-0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.53	0.81	-0.27

Drawdowns

TWCUX vs. VPMCX - Drawdown Comparison

The maximum TWCUX drawdown since its inception was -62.11%, which is greater than VPMCX's maximum drawdown of -50.45%. Use the drawdown chart below to compare losses from any high point for TWCUX and VPMCX.

Drawdown Indicators

	TWCUX	VPMCX	Difference
Max Drawdown Largest peak-to-trough decline	-62.11%	-50.45%	-11.66%
Max Drawdown (1Y) Largest decline over 1 year	-15.72%	-11.73%	-3.99%
Max Drawdown (3Y) Largest decline over 3 years	-24.86%	-20.56%	-4.30%
Max Drawdown (5Y) Largest decline over 5 years	-35.23%	-25.25%	-9.98%
Max Drawdown (10Y) Largest decline over 10 years	-35.23%	-32.65%	-2.58%
Current Drawdown Current decline from peak	-0.39%	0.00%	-0.39%
Average Drawdown Average peak-to-trough decline	-16.81%	-7.41%	-9.40%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.48%	2.54%	+1.94%

Volatility

TWCUX vs. VPMCX - Volatility Comparison

The current volatility for American Century Ultra Fund (TWCUX) is 3.78%, while Vanguard PRIMECAP Fund Investor Shares (VPMCX) has a volatility of 6.18%. This indicates that TWCUX experiences smaller price fluctuations and is considered to be less risky than VPMCX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWCUX	VPMCX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.78%	6.18%	-2.40%
Volatility (6M) Calculated over the trailing 6-month period	12.33%	12.85%	-0.52%
Volatility (1Y) Calculated over the trailing 1-year period	16.31%	16.02%	+0.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.56%	18.26%	+4.30%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.08%	19.19%	+2.89%

TWCUX vs. VPMCX - Expense Ratio Comparison

TWCUX has a 0.93% expense ratio, which is higher than VPMCX's 0.38% expense ratio.

Dividends

TWCUX vs. VPMCX - Dividend Comparison

TWCUX's dividend yield for the trailing twelve months is around 10.55%, less than VPMCX's 13.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TWCUX American Century Ultra Fund	10.55%	11.57%	3.58%	6.09%	7.42%	6.78%	2.80%	4.27%	8.24%	5.85%	4.58%	5.21%
VPMCX Vanguard PRIMECAP Fund Investor Shares	13.04%	16.36%	6.62%	7.16%	9.85%	10.08%	9.74%	7.15%	8.32%	4.53%	5.05%	5.91%

Frequently Asked Questions

Can I hold both TWCUX and VPMCX in my portfolio?

TWCUX and VPMCX have a correlation of 0.76, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TWCUX or VPMCX?

VPMCX has higher volatility (6.18%) compared to TWCUX (3.78%). In terms of maximum drawdown, TWCUX dropped -62.11% vs VPMCX's -50.45%.

Which has better risk-adjusted returns?

VPMCX currently has the higher Sharpe Ratio (3.75 vs 1.62), 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.