NPHIX vs. BIGRX

Last updated Jun 24, 2026

NPHIX (American Century High Income Fund) and BIGRX (American Century Disciplined Core Value Fund) are both mutual funds - NPHIX is a High Yield Bonds fund managed by American Century, while BIGRX is a Large Cap Value Equities fund managed by American Century. Over the past 10 years, NPHIX returned 5.43%/yr vs 11.65%/yr for BIGRX. At a 0.45 correlation, their price movements are largely independent. NPHIX charges 0.58%/yr vs 0.65%/yr for BIGRX.

Performance

NPHIX vs. BIGRX - Performance Comparison

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

Returns By Period

In the year-to-date period, NPHIX achieves a 1.32% return, which is significantly lower than BIGRX's 12.70% return. Over the past 10 years, NPHIX has underperformed BIGRX with an annualized return of 5.43%, while BIGRX has yielded a comparatively higher 11.65% annualized return.

NPHIX

• 1D: 0.00%
• 1M: 0.56%
• YTD: 1.32%
• 6M: 2.00%
• 1Y: 6.95%
• 3Y*: 8.35%
• 5Y*: 3.40%
• 10Y*: 5.43%

BIGRX

• 1D: 0.61%
• 1M: 2.69%
• YTD: 12.70%
• 6M: 11.66%
• 1Y: 28.72%
• 3Y*: 17.17%
• 5Y*: 8.45%
• 10Y*: 11.65%

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

NPHIX vs. BIGRX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NPHIX American Century High Income Fund	1.32%	8.86%	6.92%	12.05%	-12.59%	6.12%	8.03%	12.70%	-1.98%	7.02%
BIGRX American Century Disciplined Core Value Fund	12.70%	14.85%	13.26%	8.44%	-12.59%	24.22%	11.86%	24.00%	-6.37%	20.63%

Correlation

The correlation between NPHIX and BIGRX is 0.60, 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	0.60
Correlation (3Y) Calculated over the trailing 3-year period	0.53
Correlation (5Y) Calculated over the trailing 5-year period	0.51
Correlation (10Y) Calculated over the trailing 10-year period	0.48
Correlation (All Time) Calculated using the full available price history since Jan 2, 2013	0.45

The correlation between NPHIX and BIGRX shifts across timeframes, from 0.45 (all time) to 0.60 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

NPHIX vs. BIGRX — Risk / Return Rank

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

NPHIX

NPHIX Risk / Return Rank: 72
NPHIX Sharpe Ratio Rank: 59
NPHIX Sortino Ratio Rank: 82
NPHIX Omega Ratio Rank: 79
NPHIX Calmar Ratio Rank: 59
NPHIX Martin Ratio Rank: 81

BIGRX

BIGRX Risk / Return Rank: 84
BIGRX Sharpe Ratio Rank: 85
BIGRX Sortino Ratio Rank: 83
BIGRX Omega Ratio Rank: 78
BIGRX Calmar Ratio Rank: 84
BIGRX Martin Ratio Rank: 88

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.

NPHIX vs. BIGRX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century High Income Fund (NPHIX) and American Century Disciplined Core Value Fund (BIGRX). 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.

	NPHIX	BIGRX	Difference
Sharpe ratio: Return per unit of total volatility	2.08	2.56	-0.48
Sortino ratio: Return per unit of downside risk	3.57	3.61	-0.04
Omega ratio: Gain probability vs. loss probability	1.47	1.46	+0.01
Calmar ratio: Return relative to maximum drawdown	2.82	3.77	-0.95
Martin ratio: Return relative to average drawdown	14.06	15.76	-1.69

NPHIX vs. BIGRX - Sharpe Ratio Comparison

The current NPHIX Sharpe Ratio is 2.08, which is comparable to the BIGRX Sharpe Ratio of 2.56. The chart below compares the historical Sharpe Ratios of NPHIX and BIGRX, 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

NPHIX vs. BIGRX - Drawdown Comparison

The maximum NPHIX drawdown since its inception was -21.67%, smaller than the maximum BIGRX drawdown of -58.04%. Use the drawdown chart below to compare losses from any high point for NPHIX and BIGRX.

Drawdown Indicators

	NPHIX	BIGRX	Difference
Max Drawdown Largest peak-to-trough decline	-21.67%	-58.04%	+36.37%
Max Drawdown (1Y) Largest decline over 1 year	-2.52%	-7.95%	+5.43%
Max Drawdown (3Y) Largest decline over 3 years	-3.94%	-18.24%	+14.30%
Max Drawdown (5Y) Largest decline over 5 years	-16.34%	-22.19%	+5.85%
Max Drawdown (10Y) Largest decline over 10 years	-21.67%	-32.62%	+10.95%
Current Drawdown Current decline from peak	-0.23%	-0.78%	+0.55%
Average Drawdown Average peak-to-trough decline	-2.51%	-8.98%	+6.47%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.50%	1.90%	-1.40%

Volatility

NPHIX vs. BIGRX - Volatility Comparison

The current volatility for American Century High Income Fund (NPHIX) is 0.91%, while American Century Disciplined Core Value Fund (BIGRX) has a volatility of 4.27%. This indicates that NPHIX experiences smaller price fluctuations and is considered to be less risky than BIGRX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NPHIX	BIGRX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.91%	4.27%	-3.36%
Volatility (6M) Calculated over the trailing 6-month period	2.60%	8.96%	-6.36%
Volatility (1Y) Calculated over the trailing 1-year period	3.42%	11.73%	-8.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.29%	14.96%	-9.67%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.64%	16.86%	-11.22%

NPHIX vs. BIGRX - Expense Ratio Comparison

NPHIX has a 0.58% expense ratio, which is lower than BIGRX's 0.65% expense ratio.

Dividends

NPHIX vs. BIGRX - Dividend Comparison

NPHIX's dividend yield for the trailing twelve months is around 6.76%, less than BIGRX's 8.27% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIGRX American Century Disciplined Core Value Fund	8.27%	9.05%	1.32%	1.55%	1.88%	28.04%	16.19%	3.90%	13.40%	9.32%	3.91%	9.22%
NPHIX American Century High Income Fund	6.76%	6.69%	6.07%	4.81%	4.95%	5.77%	5.35%	5.54%	6.24%	5.87%	5.72%	7.44%

Frequently Asked Questions

Can I hold both NPHIX and BIGRX in my portfolio?

NPHIX and BIGRX have a correlation of 0.60, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NPHIX or BIGRX?

BIGRX has higher volatility (4.27%) compared to NPHIX (0.91%). In terms of maximum drawdown, NPHIX dropped -21.67% vs BIGRX's -58.04%.

Which has better risk-adjusted returns?

BIGRX currently has the higher Sharpe Ratio (2.56 vs 2.08), 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.