LSIIX vs. FXNAX

Last updated Jun 23, 2026

LSIIX (Loomis Sayles Investment Grade Bond Fund Class Y) and FXNAX (Fidelity U.S. Bond Index Fund) are both Total Bond Market funds. Over the past 10 years, LSIIX returned 3.09%/yr vs 1.50%/yr for FXNAX. A 0.66 correlation means they provide meaningful diversification when combined. LSIIX charges 0.54%/yr vs 0.03%/yr for FXNAX.

Performance

LSIIX vs. FXNAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Loomis Sayles Investment Grade Bond Fund Class Y (LSIIX) 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, LSIIX achieves a 0.46% return, which is significantly higher than FXNAX's 0.40% return. Over the past 10 years, LSIIX has outperformed FXNAX with an annualized return of 3.09%, while FXNAX has yielded a comparatively lower 1.50% annualized return.

LSIIX

• 1D: 0.21%
• 1M: 0.94%
• YTD: 0.46%
• 6M: 0.56%
• 1Y: 3.36%
• 3Y*: 4.56%
• 5Y*: 0.83%
• 10Y*: 3.09%

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)

LSIIX vs. FXNAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
LSIIX Loomis Sayles Investment Grade Bond Fund Class Y	0.46%	5.58%	2.91%	7.50%	-11.31%	0.18%	11.60%	9.04%	-0.31%	6.65%
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 LSIIX and FXNAX is 0.75, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.75
Correlation (3Y) Calculated over the trailing 3-year period	0.85
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (10Y) Calculated over the trailing 10-year period	0.79
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.66

The correlation between LSIIX and FXNAX shifts across timeframes, from 0.66 (all time) to 0.88 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

LSIIX vs. FXNAX — Risk / Return Rank

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

LSIIX

LSIIX Risk / Return Rank: 15
LSIIX Sharpe Ratio Rank: 15
LSIIX Sortino Ratio Rank: 14
LSIIX Omega Ratio Rank: 14
LSIIX Calmar Ratio Rank: 16
LSIIX Martin Ratio Rank: 14

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.

LSIIX vs. FXNAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Loomis Sayles Investment Grade Bond Fund Class Y (LSIIX) 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.

	LSIIX	FXNAX	Difference
Sharpe ratio: Return per unit of total volatility	1.01	1.22	-0.21
Sortino ratio: Return per unit of downside risk	1.49	1.85	-0.36
Omega ratio: Gain probability vs. loss probability	1.18	1.22	-0.04
Calmar ratio: Return relative to maximum drawdown	1.34	1.62	-0.29
Martin ratio: Return relative to average drawdown	3.69	4.68	-0.99

LSIIX vs. FXNAX - Sharpe Ratio Comparison

The current LSIIX Sharpe Ratio is 1.01, which is comparable to the FXNAX Sharpe Ratio of 1.22. The chart below compares the historical Sharpe Ratios of LSIIX 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

LSIIX vs. FXNAX - Drawdown Comparison

The maximum LSIIX drawdown since its inception was -20.77%, which is greater than FXNAX's maximum drawdown of -19.51%. Use the drawdown chart below to compare losses from any high point for LSIIX and FXNAX.

Drawdown Indicators

	LSIIX	FXNAX	Difference
Max Drawdown Largest peak-to-trough decline	-20.77%	-19.51%	-1.26%
Max Drawdown (1Y) Largest decline over 1 year	-2.99%	-2.94%	-0.05%
Max Drawdown (3Y) Largest decline over 3 years	-5.45%	-6.16%	+0.71%
Max Drawdown (5Y) Largest decline over 5 years	-15.62%	-18.54%	+2.92%
Max Drawdown (10Y) Largest decline over 10 years	-15.62%	-19.51%	+3.89%
Current Drawdown Current decline from peak	-1.13%	-2.89%	+1.76%
Average Drawdown Average peak-to-trough decline	-2.42%	-3.86%	+1.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.03%	1.02%	+0.01%

Volatility

LSIIX vs. FXNAX - Volatility Comparison

The current volatility for Loomis Sayles Investment Grade Bond Fund Class Y (LSIIX) is 1.16%, while Fidelity U.S. Bond Index Fund (FXNAX) has a volatility of 1.23%. This indicates that LSIIX experiences smaller price fluctuations and is considered to be less risky than FXNAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	LSIIX	FXNAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.16%	1.23%	-0.07%
Volatility (6M) Calculated over the trailing 6-month period	2.89%	2.89%	0.00%
Volatility (1Y) Calculated over the trailing 1-year period	3.96%	3.90%	+0.06%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.29%	6.08%	-0.79%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.51%	5.01%	-0.50%

LSIIX vs. FXNAX - Expense Ratio Comparison

LSIIX has a 0.54% expense ratio, which is higher than FXNAX's 0.03% expense ratio.

Dividends

LSIIX vs. FXNAX - Dividend Comparison

LSIIX's dividend yield for the trailing twelve months is around 3.53%, less 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%
LSIIX Loomis Sayles Investment Grade Bond Fund Class Y	3.53%	3.68%	4.86%	4.25%	3.32%	4.10%	8.20%	3.56%	2.18%	4.10%	6.71%	3.91%

Frequently Asked Questions

Can I hold both LSIIX and FXNAX in my portfolio?

LSIIX and FXNAX have a correlation of 0.75, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, LSIIX or FXNAX?

FXNAX has higher volatility (1.23%) compared to LSIIX (1.16%). In terms of maximum drawdown, LSIIX dropped -20.77% vs FXNAX's -19.51%.

Which has better risk-adjusted returns?

FXNAX currently has the higher Sharpe Ratio (1.22 vs 1.01), 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.