TWHIX vs. APOIX

Last updated Jun 3, 2026

TWHIX (American Century Heritage Fund) and APOIX (American Century Short Duration Inflation Protection Bond Fund Investor Class) are both mutual funds - TWHIX is a Mid Cap Growth Equities fund managed by American Century, while APOIX is a Inflation-Protected Bonds fund managed by American Century. Over the past 10 years, TWHIX returned 12.13%/yr vs 3.13%/yr for APOIX. At a correlation of -0.02, they often move in opposite directions. TWHIX charges 1.00%/yr vs 0.57%/yr for APOIX.

Performance

TWHIX vs. APOIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Heritage Fund (TWHIX) and American Century Short Duration Inflation Protection Bond Fund Investor Class (APOIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TWHIX achieves a 6.98% return, which is significantly higher than APOIX's 2.02% return. Over the past 10 years, TWHIX has outperformed APOIX with an annualized return of 12.13%, while APOIX has yielded a comparatively lower 3.13% annualized return.

TWHIX

• 1D: 1.18%
• 1M: 6.72%
• YTD: 6.98%
• 6M: 5.65%
• 1Y: 8.70%
• 3Y*: 15.62%
• 5Y*: 6.21%
• 10Y*: 12.13%

APOIX

• 1D: 0.00%
• 1M: -0.00%
• YTD: 2.02%
• 6M: 1.99%
• 1Y: 4.41%
• 3Y*: 4.85%
• 5Y*: 2.91%
• 10Y*: 3.13%

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

TWHIX vs. APOIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWHIX American Century Heritage Fund	6.98%	6.53%	24.66%	20.64%	-28.13%	11.52%	42.61%	35.50%	-5.08%	21.83%
APOIX American Century Short Duration Inflation Protection Bond Fund Investor Class	2.02%	5.95%	4.15%	3.82%	-3.89%	6.30%	5.06%	4.77%	1.81%	0.73%

Correlation

The correlation between TWHIX and APOIX is 0.05, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.05
Correlation (3Y) Calculated over the trailing 3-year period	0.09
Correlation (5Y) Calculated over the trailing 5-year period	0.12
Correlation (10Y) Calculated over the trailing 10-year period	0.09
Correlation (All Time) Calculated using the full available price history since Jun 1, 2005	-0.02

The correlation between TWHIX and APOIX shifts across timeframes, from -0.02 (all time) to 0.12 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

TWHIX vs. APOIX — Risk / Return Rank

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

TWHIX

TWHIX Risk / Return Rank: 6
TWHIX Sharpe Ratio Rank: 6
TWHIX Sortino Ratio Rank: 7
TWHIX Omega Ratio Rank: 6
TWHIX Calmar Ratio Rank: 6
TWHIX Martin Ratio Rank: 6

APOIX

APOIX Risk / Return Rank: 82
APOIX Sharpe Ratio Rank: 67
APOIX Sortino Ratio Rank: 82
APOIX Omega Ratio Rank: 75
APOIX Calmar Ratio Rank: 95
APOIX Martin Ratio Rank: 92

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.

TWHIX vs. APOIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Heritage Fund (TWHIX) and American Century Short Duration Inflation Protection Bond Fund Investor Class (APOIX). 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.

	TWHIX	APOIX	Difference
Sharpe ratio Return per unit of total volatility	0.54	2.40	-1.86
Sortino ratio Return per unit of downside risk	0.87	3.90	-3.02
Omega ratio Gain probability vs. loss probability	1.10	1.49	-0.39
Calmar ratio Return relative to maximum drawdown	0.66	5.92	-5.26
Martin ratio Return relative to average drawdown	1.92	19.45	-17.53
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TWHIX vs. APOIX - Sharpe Ratio Comparison

The current TWHIX Sharpe Ratio is 0.54, which is lower than the APOIX Sharpe Ratio of 2.40. The chart below compares the historical Sharpe Ratios of TWHIX and APOIX, 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

	TWHIX	APOIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.54	2.40	-1.86
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.27	0.88	-0.61
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.53	1.10	-0.57
Sharpe Ratio (All Time) Calculated using the full available price history	0.53	0.72	-0.19

Drawdowns

TWHIX vs. APOIX - Drawdown Comparison

The maximum TWHIX drawdown since its inception was -56.98%, which is greater than APOIX's maximum drawdown of -14.54%. Use the drawdown chart below to compare losses from any high point for TWHIX and APOIX.

Drawdown Indicators

	TWHIX	APOIX	Difference
Max Drawdown Largest peak-to-trough decline	-56.98%	-14.54%	-42.44%
Max Drawdown (1Y) Largest decline over 1 year	-15.82%	-0.76%	-15.06%
Max Drawdown (3Y) Largest decline over 3 years	-26.30%	-1.42%	-24.88%
Max Drawdown (5Y) Largest decline over 5 years	-40.34%	-6.58%	-33.76%
Max Drawdown (10Y) Largest decline over 10 years	-40.34%	-6.58%	-33.76%
Current Drawdown Current decline from peak	0.00%	-0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-12.25%	-1.99%	-10.26%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.43%	0.23%	+5.20%

Volatility

TWHIX vs. APOIX - Volatility Comparison

American Century Heritage Fund (TWHIX) has a higher volatility of 4.09% compared to American Century Short Duration Inflation Protection Bond Fund Investor Class (APOIX) at 0.52%. This indicates that TWHIX's price experiences larger fluctuations and is considered to be riskier than APOIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWHIX	APOIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.09%	0.52%	+3.57%
Volatility (6M) Calculated over the trailing 6-month period	13.71%	1.25%	+12.46%
Volatility (1Y) Calculated over the trailing 1-year period	17.39%	1.81%	+15.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.25%	3.31%	+19.94%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.82%	2.85%	+19.97%

TWHIX vs. APOIX - Expense Ratio Comparison

TWHIX has a 1.00% expense ratio, which is higher than APOIX's 0.57% expense ratio.

Dividends

TWHIX vs. APOIX - Dividend Comparison

TWHIX's dividend yield for the trailing twelve months is around 20.69%, more than APOIX's 3.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
APOIX American Century Short Duration Inflation Protection Bond Fund Investor Class	3.91%	3.99%	2.31%	2.78%	5.63%	3.92%	0.81%	1.69%	3.99%	1.52%	0.42%
TWHIX American Century Heritage Fund	20.69%	22.14%	15.58%	0.78%	0.98%	12.00%	13.72%	11.32%	25.33%	9.38%	8.71%

Frequently Asked Questions

Can I hold both TWHIX and APOIX in my portfolio?

TWHIX and APOIX have a correlation of 0.05, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TWHIX or APOIX?

TWHIX has higher volatility (4.09%) compared to APOIX (0.52%). In terms of maximum drawdown, TWHIX dropped -56.98% vs APOIX's -14.54%.

Which has better risk-adjusted returns?

APOIX currently has the higher Sharpe Ratio (2.40 vs 0.54), 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.