FUMBX vs. FCSTX

Last updated Jun 4, 2026

FUMBX (Fidelity Short-Term Treasury Bond Index Fund) and FCSTX (Fidelity California Limited Term Tax-Free Bond Fund) are both mutual funds - FUMBX is a Government Bonds fund tracking the Bloomberg Barclays 1-5 Year U.S. Treasury Index, while FCSTX is a Municipal Bonds fund managed by Fidelity. Over the past 5 years, FUMBX returned 1.31%/yr vs 1.23%/yr for FCSTX. At a 0.40 correlation, their price movements are largely independent. FUMBX charges 0.03%/yr vs 0.47%/yr for FCSTX.

Performance

FUMBX vs. FCSTX - Performance Comparison

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

Returns By Period

In the year-to-date period, FUMBX achieves a 0.19% return, which is significantly lower than FCSTX's 0.59% return.

FUMBX

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

FCSTX

• 1D: 0.10%
• 1M: 0.40%
• YTD: 0.59%
• 6M: 0.89%
• 1Y: 4.00%
• 3Y*: 3.53%
• 5Y*: 1.23%
• 10Y*: 1.51%

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

FUMBX vs. FCSTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
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%
FCSTX Fidelity California Limited Term Tax-Free Bond Fund	0.59%	5.23%	1.73%	3.53%	-4.71%	0.20%	2.93%	4.07%	1.25%	-0.63%

Correlation

The correlation between FUMBX and FCSTX is 0.49, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.49
Correlation (3Y) Calculated over the trailing 3-year period	0.49
Correlation (5Y) Calculated over the trailing 5-year period	0.44
Correlation (All Time) Calculated using the full available price history since Oct 20, 2017	0.40

Return for Risk

FUMBX vs. FCSTX — Risk / Return Rank

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

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

FCSTX

FCSTX Risk / Return Rank: 65
FCSTX Sharpe Ratio Rank: 84
FCSTX Sortino Ratio Rank: 89
FCSTX Omega Ratio Rank: 96
FCSTX Calmar Ratio Rank: 32
FCSTX Martin Ratio Rank: 25

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.

FUMBX vs. FCSTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Short-Term Treasury Bond Index Fund (FUMBX) and Fidelity California Limited Term Tax-Free Bond Fund (FCSTX). 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.

	FUMBX	FCSTX	Difference
Sharpe ratio: Return per unit of total volatility	1.65	2.73	-1.07
Sortino ratio: Return per unit of downside risk	2.66	4.29	-1.63
Omega ratio: Gain probability vs. loss probability	1.34	1.86	-0.53
Calmar ratio: Return relative to maximum drawdown	2.22	2.14	+0.08
Martin ratio: Return relative to average drawdown	7.08	6.20	+0.88
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FUMBX vs. FCSTX - Sharpe Ratio Comparison

The current FUMBX Sharpe Ratio is 1.65, which is lower than the FCSTX Sharpe Ratio of 2.73. The chart below compares the historical Sharpe Ratios of FUMBX and FCSTX, 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

	FUMBX	FCSTX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.65	2.73	-1.07
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.45	0.59	-0.14
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.69	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.73	1.25	-0.52

Drawdowns

FUMBX vs. FCSTX - Drawdown Comparison

The maximum FUMBX drawdown since its inception was -8.83%, which is greater than FCSTX's maximum drawdown of -7.58%. Use the drawdown chart below to compare losses from any high point for FUMBX and FCSTX.

Drawdown Indicators

	FUMBX	FCSTX	Difference
Max Drawdown Largest peak-to-trough decline	-8.83%	-7.58%	-1.25%
Max Drawdown (1Y) Largest decline over 1 year	-1.54%	-1.88%	+0.34%
Max Drawdown (3Y) Largest decline over 3 years	-1.57%	-2.21%	+0.64%
Max Drawdown (5Y) Largest decline over 5 years	-8.60%	-7.58%	-1.02%
Max Drawdown (10Y) Largest decline over 10 years	—	-7.58%	—
Current Drawdown Current decline from peak	-0.77%	-0.81%	+0.04%
Average Drawdown Average peak-to-trough decline	-1.86%	-0.92%	-0.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.48%	0.65%	-0.17%

Volatility

FUMBX vs. FCSTX - Volatility Comparison

Fidelity Short-Term Treasury Bond Index Fund (FUMBX) has a higher volatility of 0.69% compared to Fidelity California Limited Term Tax-Free Bond Fund (FCSTX) at 0.55%. This indicates that FUMBX's price experiences larger fluctuations and is considered to be riskier than FCSTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FUMBX	FCSTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.69%	0.55%	+0.14%
Volatility (6M) Calculated over the trailing 6-month period	1.49%	1.18%	+0.31%
Volatility (1Y) Calculated over the trailing 1-year period	2.06%	1.47%	+0.59%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.92%	2.10%	+0.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.49%	2.21%	+0.28%

FUMBX vs. FCSTX - Expense Ratio Comparison

FUMBX has a 0.03% expense ratio, which is lower than FCSTX's 0.47% expense ratio.

Dividends

FUMBX vs. FCSTX - Dividend Comparison

FUMBX's dividend yield for the trailing twelve months is around 3.76%, more than FCSTX's 2.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FCSTX Fidelity California Limited Term Tax-Free Bond Fund	2.29%	2.85%	2.00%	1.68%	1.01%	1.22%	1.68%	1.72%	1.71%	1.58%	1.89%	1.63%
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%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FUMBX and FCSTX in my portfolio?

FUMBX and FCSTX have a correlation of 0.49, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FUMBX or FCSTX?

FUMBX has higher volatility (0.69%) compared to FCSTX (0.55%). In terms of maximum drawdown, FUMBX dropped -8.83% vs FCSTX's -7.58%.

Which has better risk-adjusted returns?

FCSTX currently has the higher Sharpe Ratio (2.73 vs 1.65), 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.