APOIX vs. FFNYX

Last updated Jun 24, 2026

APOIX (American Century Short Duration Inflation Protection Bond Fund Investor Class) and FFNYX (Fidelity SAI 0-5 Year Inflation-Protected Bond Index Fund) are both Inflation-Protected Bonds funds. Their correlation of 0.85 suggests significant overlap in exposure. APOIX charges 0.57%/yr vs 0.05%/yr for FFNYX.

Performance

APOIX vs. FFNYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Short Duration Inflation Protection Bond Fund Investor Class (APOIX) and Fidelity SAI 0-5 Year Inflation-Protected Bond Index Fund (FFNYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

APOIX

• 1D: -0.19%
• 1M: -0.35%
• YTD: 1.19%
• 6M: 1.28%
• 1Y: 3.16%
• 3Y*: 4.62%
• 5Y*: 2.84%
• 10Y*: 3.01%

FFNYX

• 1D: -0.10%
• 1M: -0.20%
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

APOIX vs. FFNYX - Yearly Performance Comparison

	2026 (YTD)
APOIX American Century Short Duration Inflation Protection Bond Fund Investor Class	0.41%
FFNYX Fidelity SAI 0-5 Year Inflation-Protected Bond Index Fund	0.24%

Correlation

The correlation between APOIX and FFNYX is 0.85, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (All Time) Calculated using the full available price history since Mar 16, 2026	0.85

Return for Risk

APOIX vs. FFNYX — Risk / Return Rank

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

APOIX

APOIX Risk / Return Rank: 61
APOIX Sharpe Ratio Rank: 43
APOIX Sortino Ratio Rank: 49
APOIX Omega Ratio Rank: 50
APOIX Calmar Ratio Rank: 87
APOIX Martin Ratio Rank: 77

FFNYX

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

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.

APOIX vs. FFNYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Short Duration Inflation Protection Bond Fund Investor Class (APOIX) and Fidelity SAI 0-5 Year Inflation-Protected Bond Index Fund (FFNYX). 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.

	APOIX	FFNYX	Difference
Sharpe ratio: Return per unit of total volatility	1.77	—	—
Sortino ratio: Return per unit of downside risk	2.72	—	—
Omega ratio: Gain probability vs. loss probability	1.36	—	—
Calmar ratio: Return relative to maximum drawdown	3.98	—	—
Martin ratio: Return relative to average drawdown	13.40	—	—

Drawdowns

APOIX vs. FFNYX - Drawdown Comparison

The maximum APOIX drawdown since its inception was -14.54%, which is greater than FFNYX's maximum drawdown of -0.78%. Use the drawdown chart below to compare losses from any high point for APOIX and FFNYX.

Drawdown Indicators

	APOIX	FFNYX	Difference
Max Drawdown Largest peak-to-trough decline	-14.54%	-0.78%	-13.76%
Max Drawdown (1Y) Largest decline over 1 year	-0.82%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-1.42%	—	—
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	-0.82%	-0.78%	-0.04%
Average Drawdown Average peak-to-trough decline	-1.99%	-0.21%	-1.78%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.24%	—	—

Volatility

Volatility by Period

	APOIX	FFNYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.67%	—	—
Volatility (6M) Calculated over the trailing 6-month period	1.35%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	1.85%	2.00%	-0.15%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.31%	2.00%	+1.31%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.85%	2.00%	+0.85%

APOIX vs. FFNYX - Expense Ratio Comparison

APOIX has a 0.57% expense ratio, which is higher than FFNYX's 0.05% expense ratio.

Dividends

APOIX vs. FFNYX - Dividend Comparison

APOIX's dividend yield for the trailing twelve months is around 4.67%, more than FFNYX's 0.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
APOIX American Century Short Duration Inflation Protection Bond Fund Investor Class	4.67%	3.99%	2.31%	2.78%	5.63%	3.92%	0.81%	1.69%	3.99%	1.52%	0.42%
FFNYX Fidelity SAI 0-5 Year Inflation-Protected Bond Index Fund	0.04%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both APOIX and FFNYX in my portfolio?

APOIX and FFNYX have a correlation of 0.85, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.