ACIHX vs. APOIX

Last updated Jun 4, 2026

ACIHX (American Century Growth Fund G Class) and APOIX (American Century Short Duration Inflation Protection Bond Fund Investor Class) are both mutual funds - ACIHX is a Large Cap Growth Equities fund actively managed by American Century, while APOIX is a Inflation-Protected Bonds fund managed by American Century. Over the past 3 years, ACIHX returned 23.07%/yr vs 4.85%/yr for APOIX. At a 0.14 correlation, their price movements are largely independent. ACIHX charges 0.01%/yr vs 0.57%/yr for APOIX.

Performance

ACIHX vs. APOIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Growth Fund G Class (ACIHX) 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, ACIHX achieves a 8.95% return, which is significantly higher than APOIX's 2.02% return.

ACIHX

• 1D: -0.51%
• 1M: 7.84%
• YTD: 8.95%
• 6M: 8.02%
• 1Y: 27.75%
• 3Y*: 23.07%
• 5Y*: —
• 10Y*: —

APOIX

• 1D: 0.00%
• 1M: -0.00%
• YTD: 2.02%
• 6M: 1.90%
• 1Y: 4.51%
• 3Y*: 4.85%
• 5Y*: 2.96%
• 10Y*: 3.13%

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

ACIHX vs. APOIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
ACIHX American Century Growth Fund G Class	8.95%	16.26%	27.35%	44.64%	-6.24%
APOIX American Century Short Duration Inflation Protection Bond Fund Investor Class	2.02%	5.95%	4.15%	3.82%	-3.36%

Correlation

The correlation between ACIHX and APOIX is 0.02, 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	0.02
Correlation (3Y) Calculated over the trailing 3-year period	0.05
Correlation (All Time) Calculated using the full available price history since May 17, 2022	0.14

The correlation between ACIHX and APOIX shifts across timeframes, from 0.02 (1 year) to 0.14 (all time), reflecting how their relationship changes across market environments.

Return for Risk

ACIHX vs. APOIX — Risk / Return Rank

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

ACIHX

ACIHX Risk / Return Rank: 31
ACIHX Sharpe Ratio Rank: 40
ACIHX Sortino Ratio Rank: 36
ACIHX Omega Ratio Rank: 36
ACIHX Calmar Ratio Rank: 22
ACIHX Martin Ratio Rank: 23

APOIX

APOIX Risk / Return Rank: 84
APOIX Sharpe Ratio Rank: 71
APOIX Sortino Ratio Rank: 84
APOIX Omega Ratio Rank: 78
APOIX Calmar Ratio Rank: 95
APOIX Martin Ratio Rank: 91

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.

ACIHX vs. APOIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Growth Fund G Class (ACIHX) 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.

	ACIHX	APOIX	Difference
Sharpe ratio: Return per unit of total volatility	1.83	2.45	-0.63
Sortino ratio: Return per unit of downside risk	2.48	4.00	-1.52
Omega ratio: Gain probability vs. loss probability	1.32	1.51	-0.19
Calmar ratio: Return relative to maximum drawdown	1.75	5.81	-4.06
Martin ratio: Return relative to average drawdown	5.88	19.09	-13.21
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ACIHX vs. APOIX - Sharpe Ratio Comparison

The current ACIHX Sharpe Ratio is 1.83, which is comparable to the APOIX Sharpe Ratio of 2.45. The chart below compares the historical Sharpe Ratios of ACIHX 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

	ACIHX	APOIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.83	2.45	-0.63
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.90	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	1.10	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.02	0.72	+0.30

Drawdowns

ACIHX vs. APOIX - Drawdown Comparison

The maximum ACIHX drawdown since its inception was -24.00%, which is greater than APOIX's maximum drawdown of -14.54%. Use the drawdown chart below to compare losses from any high point for ACIHX and APOIX.

Drawdown Indicators

	ACIHX	APOIX	Difference
Max Drawdown Largest peak-to-trough decline	-24.00%	-14.54%	-9.46%
Max Drawdown (1Y) Largest decline over 1 year	-16.40%	-0.76%	-15.64%
Max Drawdown (3Y) Largest decline over 3 years	-24.00%	-1.42%	-22.58%
Max Drawdown (5Y) Largest decline over 5 years	—	-6.58%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-6.58%	—
Current Drawdown Current decline from peak	-0.51%	-0.00%	-0.51%
Average Drawdown Average peak-to-trough decline	-4.89%	-1.99%	-2.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.87%	0.23%	+4.64%

Volatility

ACIHX vs. APOIX - Volatility Comparison

American Century Growth Fund G Class (ACIHX) has a higher volatility of 3.44% compared to American Century Short Duration Inflation Protection Bond Fund Investor Class (APOIX) at 0.51%. This indicates that ACIHX'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

	ACIHX	APOIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.44%	0.51%	+2.93%
Volatility (6M) Calculated over the trailing 6-month period	11.92%	1.25%	+10.67%
Volatility (1Y) Calculated over the trailing 1-year period	15.71%	1.81%	+13.90%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.05%	3.31%	+17.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.05%	2.85%	+18.20%

ACIHX vs. APOIX - Expense Ratio Comparison

ACIHX has a 0.01% expense ratio, which is lower than APOIX's 0.57% expense ratio.

Dividends

ACIHX vs. APOIX - Dividend Comparison

ACIHX's dividend yield for the trailing twelve months is around 14.64%, more than APOIX's 3.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
ACIHX American Century Growth Fund G Class	14.64%	15.95%	5.65%	4.61%	2.86%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
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%

Frequently Asked Questions

Can I hold both ACIHX and APOIX in my portfolio?

ACIHX and APOIX have a correlation of 0.02, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ACIHX or APOIX?

ACIHX has higher volatility (3.44%) compared to APOIX (0.51%). In terms of maximum drawdown, ACIHX dropped -24.00% vs APOIX's -14.54%.

Which has better risk-adjusted returns?

APOIX currently has the higher Sharpe Ratio (2.45 vs 1.83), 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.