FZOMX vs. FXAIX

Last updated Apr 2, 2026

Compare and contrast key facts about Fidelity SAI Short-Term Bond Fund (FZOMX) and Fidelity 500 Index Fund (FXAIX).

FZOMX is managed by Fidelity. It was launched on Oct 13, 2020. FXAIX is a passively managed fund by Fidelity that tracks the performance of the S&P 500 Index. It was launched on Feb 17, 1988.

Performance

FZOMX vs. FXAIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI Short-Term Bond Fund (FZOMX) and Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

FZOMX vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
FZOMX Fidelity SAI Short-Term Bond Fund	0.22%	5.51%	4.71%	5.21%	-3.71%	-0.69%	0.37%
FXAIX Fidelity 500 Index Fund	-4.34%	17.84%	25.01%	26.29%	-18.14%	28.71%	10.93%

Returns By Period

In the year-to-date period, FZOMX achieves a 0.22% return, which is significantly higher than FXAIX's -4.34% return.

FZOMX

• 1D: 0.10%
• 1M: -0.41%
• YTD: 0.22%
• 6M: 1.18%
• 1Y: 3.98%
• 3Y*: 4.68%
• 5Y*: 2.25%
• 10Y*: —

FXAIX

• 1D: 2.92%
• 1M: -5.02%
• YTD: -4.34%
• 6M: -2.14%
• 1Y: 17.32%
• 3Y*: 18.30%
• 5Y*: 11.79%
• 10Y*: 14.08%

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

FZOMX vs. FXAIX - Expense Ratio Comparison

FZOMX has a 0.30% expense ratio, which is higher than FXAIX's 0.02% expense ratio.

FZOMX

Fidelity SAI Short-Term Bond Fund

FXAIX

Fidelity 500 Index Fund

Return for Risk

FZOMX vs. FXAIX — Risk / Return Rank

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

FZOMX

FZOMX Risk / Return Rank: 94
FZOMX Sharpe Ratio Rank: 90
FZOMX Sortino Ratio Rank: 96
FZOMX Omega Ratio Rank: 93
FZOMX Calmar Ratio Rank: 96
FZOMX Martin Ratio Rank: 95

FXAIX

FXAIX Risk / Return Rank: 60
FXAIX Sharpe Ratio Rank: 48
FXAIX Sortino Ratio Rank: 53
FXAIX Omega Ratio Rank: 56
FXAIX Calmar Ratio Rank: 64
FXAIX Martin Ratio Rank: 76

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.

FZOMX vs. FXAIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI Short-Term Bond Fund (FZOMX) and Fidelity 500 Index Fund (FXAIX). 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.

	FZOMX	FXAIX	Difference
Sharpe ratio Return per unit of total volatility	1.90	0.97	+0.92
Sortino ratio Return per unit of downside risk	3.42	1.49	+1.93
Omega ratio Gain probability vs. loss probability	1.47	1.23	+0.24
Calmar ratio Return relative to maximum drawdown	3.56	1.52	+2.04
Martin ratio Return relative to average drawdown	14.10	7.30	+6.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FZOMX vs. FXAIX - Sharpe Ratio Comparison

The current FZOMX Sharpe Ratio is 1.90, which is higher than the FXAIX Sharpe Ratio of 0.97. The chart below compares the historical Sharpe Ratios of FZOMX and FXAIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	FZOMX	FXAIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.90	0.97	+0.92
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.04	0.70	+0.34
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.78	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.98	0.76	+0.22

Correlation

The correlation between FZOMX and FXAIX is 0.08, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

FZOMX vs. FXAIX - Dividend Comparison

FZOMX's dividend yield for the trailing twelve months is around 4.23%, more than FXAIX's 1.16% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FZOMX Fidelity SAI Short-Term Bond Fund	4.23%	4.64%	4.27%	3.26%	0.76%	0.41%	0.07%	0.00%	0.00%	0.00%	0.00%	0.00%
FXAIX Fidelity 500 Index Fund	1.16%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%

Drawdowns

FZOMX vs. FXAIX - Drawdown Comparison

The maximum FZOMX drawdown since its inception was -6.12%, smaller than the maximum FXAIX drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for FZOMX and FXAIX.

Drawdown Indicators

	FZOMX	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	-6.12%	-33.79%	+27.67%
Max Drawdown (1Y) Largest decline over 1 year	-1.23%	-12.13%	+10.90%
Max Drawdown (5Y) Largest decline over 5 years	-6.12%	-24.50%	+18.38%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.79%	—
Current Drawdown Current decline from peak	-0.61%	-6.23%	+5.62%
Average Drawdown Average peak-to-trough decline	-1.32%	-3.83%	+2.51%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.31%	2.53%	-2.22%

Volatility

FZOMX vs. FXAIX - Volatility Comparison

The current volatility for Fidelity SAI Short-Term Bond Fund (FZOMX) is 0.70%, while Fidelity 500 Index Fund (FXAIX) has a volatility of 5.34%. This indicates that FZOMX experiences smaller price fluctuations and is considered to be less risky than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FZOMX	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.70%	5.34%	-4.64%
Volatility (6M) Calculated over the trailing 6-month period	1.38%	9.53%	-8.15%
Volatility (1Y) Calculated over the trailing 1-year period	2.14%	18.32%	-16.18%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.17%	16.92%	-14.75%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.08%	18.05%	-15.97%