PDIIX vs. FXNAX

Last updated Jun 4, 2026

PDIIX (PIMCO Diversified Income Fund) and FXNAX (Fidelity U.S. Bond Index Fund) are both mutual funds - PDIIX is a Multisector Bonds fund managed by PIMCO, while FXNAX is a Total Bond Market fund tracking the Bloomberg U.S. Aggregate Bond Index. Over the past 10 years, PDIIX returned 4.34%/yr vs 1.51%/yr for FXNAX. A 0.59 correlation means they provide meaningful diversification when combined. PDIIX charges 0.75%/yr vs 0.03%/yr for FXNAX.

Performance

PDIIX vs. FXNAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in PIMCO Diversified Income Fund (PDIIX) 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, PDIIX achieves a 1.54% return, which is significantly higher than FXNAX's 0.40% return. Over the past 10 years, PDIIX has outperformed FXNAX with an annualized return of 4.34%, while FXNAX has yielded a comparatively lower 1.51% annualized return.

PDIIX

• 1D: 0.10%
• 1M: 0.98%
• YTD: 1.54%
• 6M: 1.82%
• 1Y: 8.85%
• 3Y*: 8.69%
• 5Y*: 2.60%
• 10Y*: 4.34%

FXNAX

• 1D: 0.00%
• 1M: 0.51%
• YTD: 0.40%
• 6M: 0.34%
• 1Y: 5.37%
• 3Y*: 4.02%
• 5Y*: 0.12%
• 10Y*: 1.51%

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

PDIIX vs. FXNAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PDIIX PIMCO Diversified Income Fund	1.54%	10.42%	6.35%	10.41%	-14.70%	0.42%	6.43%	13.05%	-0.97%	8.87%
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 PDIIX 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	0.84
Correlation (5Y) Calculated over the trailing 5-year period	0.79
Correlation (10Y) Calculated over the trailing 10-year period	0.70
Correlation (All Time) Calculated using the full available price history since May 5, 2011	0.59

Over the past year, PDIIX and FXNAX have become more correlated (0.80) than their long-term average of 0.59, meaning their price movements have been converging.

Return for Risk

PDIIX vs. FXNAX — Risk / Return Rank

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

PDIIX

PDIIX Risk / Return Rank: 64
PDIIX Sharpe Ratio Rank: 67
PDIIX Sortino Ratio Rank: 79
PDIIX Omega Ratio Rank: 75
PDIIX Calmar Ratio Rank: 46
PDIIX Martin Ratio Rank: 51

FXNAX

FXNAX Risk / Return Rank: 23
FXNAX Sharpe Ratio Rank: 23
FXNAX Sortino Ratio Rank: 24
FXNAX Omega Ratio Rank: 22
FXNAX Calmar Ratio Rank: 24
FXNAX Martin Ratio Rank: 21

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.

PDIIX vs. FXNAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for PIMCO Diversified Income Fund (PDIIX) 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.

	PDIIX	FXNAX	Difference
Sharpe ratio: Return per unit of total volatility	2.38	1.36	+1.02
Sortino ratio: Return per unit of downside risk	3.75	2.06	+1.70
Omega ratio: Gain probability vs. loss probability	1.49	1.24	+0.25
Calmar ratio: Return relative to maximum drawdown	2.58	1.83	+0.75
Martin ratio: Return relative to average drawdown	10.53	5.61	+4.93
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PDIIX vs. FXNAX - Sharpe Ratio Comparison

The current PDIIX Sharpe Ratio is 2.38, which is higher than the FXNAX Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of PDIIX 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.

Sharpe Ratios by Period

	PDIIX	FXNAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.38	1.36	+1.02
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.52	0.02	+0.50
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.89	0.30	+0.59
Sharpe Ratio (All Time) Calculated using the full available price history	1.22	0.45	+0.77

Drawdowns

PDIIX vs. FXNAX - Drawdown Comparison

The maximum PDIIX drawdown since its inception was -21.96%, which is greater than FXNAX's maximum drawdown of -19.51%. Use the drawdown chart below to compare losses from any high point for PDIIX and FXNAX.

Drawdown Indicators

	PDIIX	FXNAX	Difference
Max Drawdown Largest peak-to-trough decline	-21.96%	-19.51%	-2.45%
Max Drawdown (1Y) Largest decline over 1 year	-3.55%	-2.94%	-0.61%
Max Drawdown (3Y) Largest decline over 3 years	-4.27%	-6.16%	+1.89%
Max Drawdown (5Y) Largest decline over 5 years	-20.50%	-18.54%	-1.96%
Max Drawdown (10Y) Largest decline over 10 years	-20.50%	-19.51%	-0.99%
Current Drawdown Current decline from peak	-0.06%	-2.89%	+2.83%
Average Drawdown Average peak-to-trough decline	-2.82%	-3.87%	+1.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.87%	0.96%	-0.09%

Volatility

PDIIX vs. FXNAX - Volatility Comparison

PIMCO Diversified Income Fund (PDIIX) has a higher volatility of 1.49% compared to Fidelity U.S. Bond Index Fund (FXNAX) at 1.41%. This indicates that PDIIX'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

	PDIIX	FXNAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.49%	1.41%	+0.08%
Volatility (6M) Calculated over the trailing 6-month period	3.17%	2.82%	+0.35%
Volatility (1Y) Calculated over the trailing 1-year period	3.85%	3.97%	-0.12%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.00%	6.07%	-1.07%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.89%	5.01%	-0.12%

PDIIX vs. FXNAX - Expense Ratio Comparison

PDIIX has a 0.75% expense ratio, which is higher than FXNAX's 0.03% expense ratio.

Dividends

PDIIX vs. FXNAX - Dividend Comparison

PDIIX's dividend yield for the trailing twelve months is around 5.52%, more than FXNAX's 3.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
PDIIX PIMCO Diversified Income Fund	5.52%	5.42%	5.18%	4.66%	3.91%	3.65%	3.68%	5.04%	4.46%	4.84%	4.94%	7.68%

Frequently Asked Questions

Can I hold both PDIIX and FXNAX in my portfolio?

PDIIX 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, PDIIX or FXNAX?

PDIIX has higher volatility (1.49%) compared to FXNAX (1.41%). In terms of maximum drawdown, PDIIX dropped -21.96% vs FXNAX's -19.51%.

Which has better risk-adjusted returns?

PDIIX currently has the higher Sharpe Ratio (2.38 vs 1.36), 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.