BIGRX vs. AULDX

Last updated Jun 4, 2026

BIGRX (American Century Disciplined Core Value Fund) and AULDX (American Century Ultra Fund Class R6) are both mutual funds - BIGRX is a Large Cap Value Equities fund managed by American Century, while AULDX is a Large Cap Growth Equities fund actively managed by American Century. Over the past 10 years, BIGRX returned 11.30%/yr vs 18.69%/yr for AULDX. A 0.76 correlation means they provide meaningful diversification when combined. BIGRX charges 0.65%/yr vs 0.52%/yr for AULDX.

Performance

BIGRX vs. AULDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Disciplined Core Value Fund (BIGRX) and American Century Ultra Fund Class R6 (AULDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BIGRX achieves a 11.88% return, which is significantly higher than AULDX's 9.84% return. Over the past 10 years, BIGRX has underperformed AULDX with an annualized return of 11.30%, while AULDX has yielded a comparatively higher 18.69% annualized return.

BIGRX

• 1D: 0.44%
• 1M: 4.27%
• YTD: 11.88%
• 6M: 12.76%
• 1Y: 28.35%
• 3Y*: 17.40%
• 5Y*: 7.51%
• 10Y*: 11.30%

AULDX

• 1D: -0.38%
• 1M: 6.26%
• YTD: 9.84%
• 6M: 8.20%
• 1Y: 26.07%
• 3Y*: 22.37%
• 5Y*: 13.43%
• 10Y*: 18.69%

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

BIGRX vs. AULDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BIGRX American Century Disciplined Core Value Fund	11.88%	14.85%	13.26%	8.44%	-12.59%	24.22%	11.86%	24.00%	-6.37%	20.63%
AULDX American Century Ultra Fund Class R6	9.84%	13.05%	29.99%	43.86%	-32.15%	23.89%	50.31%	35.23%	1.04%	32.36%

Correlation

The correlation between BIGRX and AULDX is 0.58, 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	0.58
Correlation (3Y) Calculated over the trailing 3-year period	0.58
Correlation (5Y) Calculated over the trailing 5-year period	0.66
Correlation (10Y) Calculated over the trailing 10-year period	0.72
Correlation (All Time) Calculated using the full available price history since Jan 3, 2014	0.76

The correlation between BIGRX and AULDX shifts across timeframes, from 0.58 (3 years) to 0.76 (all time), reflecting how their relationship changes across market environments.

Return for Risk

BIGRX vs. AULDX — Risk / Return Rank

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

BIGRX

BIGRX Risk / Return Rank: 79
BIGRX Sharpe Ratio Rank: 81
BIGRX Sortino Ratio Rank: 79
BIGRX Omega Ratio Rank: 71
BIGRX Calmar Ratio Rank: 80
BIGRX Martin Ratio Rank: 82

AULDX

AULDX Risk / Return Rank: 28
AULDX Sharpe Ratio Rank: 33
AULDX Sortino Ratio Rank: 29
AULDX Omega Ratio Rank: 30
AULDX Calmar Ratio Rank: 22
AULDX Martin Ratio Rank: 25

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.

BIGRX vs. AULDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Disciplined Core Value Fund (BIGRX) and American Century Ultra Fund Class R6 (AULDX). 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.

	BIGRX	AULDX	Difference
Sharpe ratio Return per unit of total volatility	2.61	1.65	+0.96
Sortino ratio Return per unit of downside risk	3.73	2.26	+1.47
Omega ratio Gain probability vs. loss probability	1.47	1.29	+0.18
Calmar ratio Return relative to maximum drawdown	3.70	1.72	+1.97
Martin ratio Return relative to average drawdown	15.59	6.07	+9.52
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BIGRX vs. AULDX - Sharpe Ratio Comparison

The current BIGRX Sharpe Ratio is 2.61, which is higher than the AULDX Sharpe Ratio of 1.65. The chart below compares the historical Sharpe Ratios of BIGRX and AULDX, 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

	BIGRX	AULDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.61	1.65	+0.96
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.51	0.60	-0.09
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.67	0.85	-0.18
Sharpe Ratio (All Time) Calculated using the full available price history	0.58	0.78	-0.20

Drawdowns

BIGRX vs. AULDX - Drawdown Comparison

The maximum BIGRX drawdown since its inception was -58.04%, which is greater than AULDX's maximum drawdown of -35.03%. Use the drawdown chart below to compare losses from any high point for BIGRX and AULDX.

Drawdown Indicators

	BIGRX	AULDX	Difference
Max Drawdown Largest peak-to-trough decline	-58.04%	-35.03%	-23.01%
Max Drawdown (1Y) Largest decline over 1 year	-7.95%	-15.60%	+7.65%
Max Drawdown (3Y) Largest decline over 3 years	-18.24%	-24.78%	+6.54%
Max Drawdown (5Y) Largest decline over 5 years	-22.19%	-35.03%	+12.84%
Max Drawdown (10Y) Largest decline over 10 years	-32.62%	-35.03%	+2.41%
Current Drawdown Current decline from peak	0.00%	-0.38%	+0.38%
Average Drawdown Average peak-to-trough decline	-9.00%	-6.19%	-2.81%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.88%	4.42%	-2.54%

Volatility

BIGRX vs. AULDX - Volatility Comparison

The current volatility for American Century Disciplined Core Value Fund (BIGRX) is 2.91%, while American Century Ultra Fund Class R6 (AULDX) has a volatility of 3.77%. This indicates that BIGRX experiences smaller price fluctuations and is considered to be less risky than AULDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BIGRX	AULDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.91%	3.77%	-0.86%
Volatility (6M) Calculated over the trailing 6-month period	8.36%	12.32%	-3.96%
Volatility (1Y) Calculated over the trailing 1-year period	11.24%	16.30%	-5.06%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.94%	22.57%	-7.63%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.82%	22.08%	-5.26%

BIGRX vs. AULDX - Expense Ratio Comparison

BIGRX has a 0.65% expense ratio, which is higher than AULDX's 0.52% expense ratio.

Dividends

BIGRX vs. AULDX - Dividend Comparison

BIGRX's dividend yield for the trailing twelve months is around 8.09%, less than AULDX's 9.65% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AULDX American Century Ultra Fund Class R6	9.65%	10.60%	3.32%	5.68%	6.97%	6.42%	2.67%	4.18%	7.94%	6.19%	4.45%	5.06%
BIGRX American Century Disciplined Core Value Fund	8.09%	9.05%	1.32%	1.55%	1.88%	28.04%	16.19%	3.90%	13.40%	9.32%	3.91%	9.22%

Frequently Asked Questions

Can I hold both BIGRX and AULDX in my portfolio?

BIGRX and AULDX have a correlation of 0.58, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BIGRX or AULDX?

AULDX has higher volatility (3.77%) compared to BIGRX (2.91%). In terms of maximum drawdown, BIGRX dropped -58.04% vs AULDX's -35.03%.

Which has better risk-adjusted returns?

BIGRX currently has the higher Sharpe Ratio (2.61 vs 1.65), 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.