FUAMX vs. FUMBX

Last updated Jun 4, 2026

FUAMX (Fidelity Intermediate Treasury Bond Index Fund) and FUMBX (Fidelity Short-Term Treasury Bond Index Fund) are both Government Bonds funds from Fidelity. Over the past 5 years, FUAMX returned -0.36%/yr vs 1.31%/yr for FUMBX. Their correlation of 0.86 suggests significant overlap in exposure. Both charge a 0.03% expense ratio.

Performance

FUAMX vs. FUMBX - Performance Comparison

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

Returns By Period

In the year-to-date period, FUAMX achieves a -0.27% return, which is significantly lower than FUMBX's 0.19% return.

FUAMX

• 1D: 0.10%
• 1M: 0.10%
• YTD: -0.27%
• 6M: -0.64%
• 1Y: 4.20%
• 3Y*: 3.20%
• 5Y*: -0.36%
• 10Y*: —

FUMBX

• 1D: 0.00%
• 1M: 0.07%
• YTD: 0.19%
• 6M: 0.46%
• 1Y: 3.39%
• 3Y*: 4.03%
• 5Y*: 1.31%
• 10Y*: —

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

FUAMX vs. FUMBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FUAMX Fidelity Intermediate Treasury Bond Index Fund	-0.27%	8.00%	0.40%	4.08%	-13.06%	-3.19%	8.86%	7.25%	1.25%	-0.35%
FUMBX Fidelity Short-Term Treasury Bond Index Fund	0.19%	5.83%	3.25%	4.47%	-5.84%	-1.38%	4.22%	4.19%	1.47%	-0.33%

Correlation

The correlation between FUAMX and FUMBX 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 (1Y) Calculated over the trailing 1-year period	0.85
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (All Time) Calculated using the full available price history since Oct 20, 2017	0.86

The correlation between FUAMX and FUMBX has been stable across timeframes, ranging from 0.85 to 0.88 - a consistent structural relationship.

Return for Risk

FUAMX vs. FUMBX — Risk / Return Rank

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

FUAMX

FUAMX Risk / Return Rank: 12
FUAMX Sharpe Ratio Rank: 12
FUAMX Sortino Ratio Rank: 13
FUAMX Omega Ratio Rank: 11
FUAMX Calmar Ratio Rank: 11
FUAMX Martin Ratio Rank: 11

FUMBX

FUMBX Risk / Return Rank: 36
FUMBX Sharpe Ratio Rank: 33
FUMBX Sortino Ratio Rank: 40
FUMBX Omega Ratio Rank: 40
FUMBX Calmar Ratio Rank: 34
FUMBX Martin Ratio Rank: 30

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.

FUAMX vs. FUMBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Intermediate Treasury Bond Index Fund (FUAMX) and Fidelity Short-Term Treasury Bond Index Fund (FUMBX). 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.

	FUAMX	FUMBX	Difference
Sharpe ratio: Return per unit of total volatility	0.95	1.65	-0.70
Sortino ratio: Return per unit of downside risk	1.44	2.66	-1.22
Omega ratio: Gain probability vs. loss probability	1.17	1.34	-0.17
Calmar ratio: Return relative to maximum drawdown	1.11	2.22	-1.11
Martin ratio: Return relative to average drawdown	3.27	7.08	-3.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FUAMX vs. FUMBX - Sharpe Ratio Comparison

The current FUAMX Sharpe Ratio is 0.95, which is lower than the FUMBX Sharpe Ratio of 1.65. The chart below compares the historical Sharpe Ratios of FUAMX and FUMBX, 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

	FUAMX	FUMBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.95	1.65	-0.70
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.05	0.45	-0.51
Sharpe Ratio (All Time) Calculated using the full available price history	0.22	0.73	-0.51

Drawdowns

FUAMX vs. FUMBX - Drawdown Comparison

The maximum FUAMX drawdown since its inception was -20.25%, which is greater than FUMBX's maximum drawdown of -8.83%. Use the drawdown chart below to compare losses from any high point for FUAMX and FUMBX.

Drawdown Indicators

	FUAMX	FUMBX	Difference
Max Drawdown Largest peak-to-trough decline	-20.25%	-8.83%	-11.42%
Max Drawdown (1Y) Largest decline over 1 year	-3.72%	-1.54%	-2.18%
Max Drawdown (3Y) Largest decline over 3 years	-6.07%	-1.57%	-4.50%
Max Drawdown (5Y) Largest decline over 5 years	-18.27%	-8.60%	-9.67%
Current Drawdown Current decline from peak	-6.69%	-0.77%	-5.92%
Average Drawdown Average peak-to-trough decline	-7.32%	-1.86%	-5.46%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.26%	0.48%	+0.78%

Volatility

FUAMX vs. FUMBX - Volatility Comparison

Fidelity Intermediate Treasury Bond Index Fund (FUAMX) has a higher volatility of 1.44% compared to Fidelity Short-Term Treasury Bond Index Fund (FUMBX) at 0.69%. This indicates that FUAMX's price experiences larger fluctuations and is considered to be riskier than FUMBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FUAMX	FUMBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.44%	0.69%	+0.75%
Volatility (6M) Calculated over the trailing 6-month period	3.09%	1.49%	+1.60%
Volatility (1Y) Calculated over the trailing 1-year period	4.34%	2.06%	+2.28%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.63%	2.92%	+3.71%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.85%	2.49%	+3.36%

FUAMX vs. FUMBX - Expense Ratio Comparison

Both FUAMX and FUMBX have an expense ratio of 0.03%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.

Dividends

FUAMX vs. FUMBX - Dividend Comparison

FUAMX's dividend yield for the trailing twelve months is around 3.75%, which matches FUMBX's 3.76% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
FUAMX Fidelity Intermediate Treasury Bond Index Fund	3.75%	3.52%	3.58%	2.20%	1.24%	1.76%	2.90%	2.16%	2.23%	0.49%
FUMBX Fidelity Short-Term Treasury Bond Index Fund	3.76%	3.51%	2.91%	1.64%	0.86%	1.15%	1.41%	1.88%	1.64%	0.34%

Frequently Asked Questions

Can I hold both FUAMX and FUMBX in my portfolio?

FUAMX and FUMBX 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.

Which is riskier, FUAMX or FUMBX?

FUAMX has higher volatility (1.44%) compared to FUMBX (0.69%). In terms of maximum drawdown, FUAMX dropped -20.25% vs FUMBX's -8.83%.

Which has better risk-adjusted returns?

FUMBX currently has the higher Sharpe Ratio (1.65 vs 0.95), 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.