BPRIX vs. FXNAX

Last updated Jun 23, 2026

BPRIX (BlackRock Inflation Protected Bond Fund) and FXNAX (Fidelity U.S. Bond Index Fund) are both mutual funds - BPRIX is a Inflation-Protected Bonds fund managed by BlackRock, while FXNAX is a Total Bond Market fund tracking the Bloomberg U.S. Aggregate Bond Index. Over the past 10 years, BPRIX returned 2.41%/yr vs 1.50%/yr for FXNAX. A 0.76 correlation means they provide meaningful diversification when combined. BPRIX charges 0.40%/yr vs 0.03%/yr for FXNAX.

Performance

BPRIX vs. FXNAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BlackRock Inflation Protected Bond Fund (BPRIX) and Fidelity U.S. Bond Index Fund (FXNAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BPRIX achieves a 0.61% return, which is significantly higher than FXNAX's 0.40% return. Over the past 10 years, BPRIX has outperformed FXNAX with an annualized return of 2.41%, while FXNAX has yielded a comparatively lower 1.50% annualized return.

BPRIX

• 1D: 0.21%
• 1M: 0.63%
• YTD: 0.61%
• 6M: 0.99%
• 1Y: 3.67%
• 3Y*: 3.10%
• 5Y*: 0.49%
• 10Y*: 2.41%

FXNAX

• 1D: 0.19%
• 1M: 0.90%
• YTD: 0.40%
• 6M: 0.72%
• 1Y: 4.76%
• 3Y*: 4.02%
• 5Y*: -0.06%
• 10Y*: 1.50%

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

BPRIX vs. FXNAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BPRIX BlackRock Inflation Protected Bond Fund	0.61%	6.84%	1.41%	2.92%	-12.87%	5.76%	11.76%	8.33%	-1.85%	3.10%
FXNAX Fidelity U.S. Bond Index Fund	0.40%	7.14%	1.35%	5.82%	-13.55%	-2.10%	7.63%	8.50%	0.04%	3.50%

Correlation

The correlation between BPRIX and FXNAX is 0.80, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.80
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.80
Correlation (10Y) Calculated over the trailing 10-year period	0.76
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.76

The correlation between BPRIX and FXNAX shifts across timeframes, from 0.76 (all time) to 0.88 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

BPRIX vs. FXNAX — Risk / Return Rank

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

BPRIX

BPRIX Risk / Return Rank: 20
BPRIX Sharpe Ratio Rank: 16
BPRIX Sortino Ratio Rank: 19
BPRIX Omega Ratio Rank: 17
BPRIX Calmar Ratio Rank: 22
BPRIX Martin Ratio Rank: 23

FXNAX

FXNAX Risk / Return Rank: 21
FXNAX Sharpe Ratio Rank: 21
FXNAX Sortino Ratio Rank: 22
FXNAX Omega Ratio Rank: 20
FXNAX Calmar Ratio Rank: 22
FXNAX Martin Ratio Rank: 20

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.

BPRIX vs. FXNAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BlackRock Inflation Protected Bond Fund (BPRIX) and Fidelity U.S. Bond Index Fund (FXNAX). 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.

	BPRIX	FXNAX	Difference
Sharpe ratio: Return per unit of total volatility	1.08	1.22	-0.14
Sortino ratio: Return per unit of downside risk	1.69	1.85	-0.16
Omega ratio: Gain probability vs. loss probability	1.20	1.22	-0.02
Calmar ratio: Return relative to maximum drawdown	1.62	1.62	0.00
Martin ratio: Return relative to average drawdown	5.27	4.68	+0.59

BPRIX vs. FXNAX - Sharpe Ratio Comparison

The current BPRIX Sharpe Ratio is 1.08, which is comparable to the FXNAX Sharpe Ratio of 1.22. The chart below compares the historical Sharpe Ratios of BPRIX and FXNAX, 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

BPRIX vs. FXNAX - Drawdown Comparison

The maximum BPRIX drawdown since its inception was -15.52%, smaller than the maximum FXNAX drawdown of -19.51%. Use the drawdown chart below to compare losses from any high point for BPRIX and FXNAX.

Drawdown Indicators

	BPRIX	FXNAX	Difference
Max Drawdown Largest peak-to-trough decline	-15.52%	-19.51%	+3.99%
Max Drawdown (1Y) Largest decline over 1 year	-2.40%	-2.94%	+0.54%
Max Drawdown (3Y) Largest decline over 3 years	-4.86%	-6.16%	+1.30%
Max Drawdown (5Y) Largest decline over 5 years	-15.52%	-18.54%	+3.02%
Max Drawdown (10Y) Largest decline over 10 years	-15.52%	-19.51%	+3.99%
Current Drawdown Current decline from peak	-2.63%	-2.89%	+0.26%
Average Drawdown Average peak-to-trough decline	-3.81%	-3.86%	+0.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.74%	1.02%	-0.28%

Volatility

BPRIX vs. FXNAX - Volatility Comparison

BlackRock Inflation Protected Bond Fund (BPRIX) has a higher volatility of 1.63% compared to Fidelity U.S. Bond Index Fund (FXNAX) at 1.23%. This indicates that BPRIX's price experiences larger fluctuations and is considered to be riskier than FXNAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BPRIX	FXNAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.63%	1.23%	+0.40%
Volatility (6M) Calculated over the trailing 6-month period	2.79%	2.89%	-0.10%
Volatility (1Y) Calculated over the trailing 1-year period	3.61%	3.90%	-0.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.14%	6.08%	+0.06%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.53%	5.01%	+0.52%

BPRIX vs. FXNAX - Expense Ratio Comparison

BPRIX has a 0.40% expense ratio, which is higher than FXNAX's 0.03% expense ratio.

Dividends

BPRIX vs. FXNAX - Dividend Comparison

BPRIX's dividend yield for the trailing twelve months is around 4.71%, more than FXNAX's 3.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BPRIX BlackRock Inflation Protected Bond Fund	4.71%	4.47%	3.38%	2.48%	6.04%	6.39%	1.48%	2.34%	2.78%	2.20%	1.19%	2.07%
FXNAX Fidelity U.S. Bond Index Fund	3.71%	3.58%	3.40%	3.15%	1.81%	1.74%	2.92%	2.68%	2.74%	2.57%	2.76%	2.52%

Frequently Asked Questions

Can I hold both BPRIX and FXNAX in my portfolio?

BPRIX and FXNAX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BPRIX or FXNAX?

BPRIX has higher volatility (1.63%) compared to FXNAX (1.23%). In terms of maximum drawdown, BPRIX dropped -15.52% vs FXNAX's -19.51%.

Which has better risk-adjusted returns?

FXNAX currently has the higher Sharpe Ratio (1.22 vs 1.08), 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.