LSMSX vs. FMBIX

Last updated Jun 4, 2026

LSMSX (Western Asset SMASh Series TF Fund) and FMBIX (Fidelity Municipal Bond Index Fund) are both Municipal Bonds funds. A 0.78 correlation means they provide meaningful diversification when combined. LSMSX charges 0.01%/yr vs 0.07%/yr for FMBIX.

Performance

LSMSX vs. FMBIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Western Asset SMASh Series TF Fund (LSMSX) and Fidelity Municipal Bond Index Fund (FMBIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

LSMSX

• 1D: 0.31%
• 1M: 1.07%
• YTD: 2.18%
• 6M: 2.48%
• 1Y: 8.53%
• 3Y*: 4.03%
• 5Y*: 1.20%
• 10Y*: —

FMBIX

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

LSMSX vs. FMBIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
LSMSX Western Asset SMASh Series TF Fund	2.18%	3.22%	2.22%	7.96%	-10.03%	4.11%	4.48%	2.18%
FMBIX Fidelity Municipal Bond Index Fund	0.00%	0.60%	1.32%	5.89%	-10.00%	1.14%	3.10%	1.48%

Correlation

The correlation between LSMSX and FMBIX is 0.78, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (3Y) Calculated over the trailing 3-year period	0.68
Correlation (5Y) Calculated over the trailing 5-year period	0.79
Correlation (All Time) Calculated using the full available price history since Jul 18, 2019	0.78

The correlation between LSMSX and FMBIX shifts across timeframes, from 0.68 (3 years) to 0.79 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

LSMSX vs. FMBIX — Risk / Return Rank

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

LSMSX

LSMSX Risk / Return Rank: 77
LSMSX Sharpe Ratio Rank: 89
LSMSX Sortino Ratio Rank: 92
LSMSX Omega Ratio Rank: 94
LSMSX Calmar Ratio Rank: 61
LSMSX Martin Ratio Rank: 49

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.

LSMSX vs. FMBIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Western Asset SMASh Series TF Fund (LSMSX) and Fidelity Municipal Bond Index Fund (FMBIX). 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.

	LSMSX	FMBIX	Difference
Sharpe ratio: Return per unit of total volatility	2.95	—	—
Sortino ratio: Return per unit of downside risk	4.61	—	—
Omega ratio: Gain probability vs. loss probability	1.72	—	—
Calmar ratio: Return relative to maximum drawdown	2.99	—	—
Martin ratio: Return relative to average drawdown	10.07	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	LSMSX	FMBIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.95	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.27	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.63	—	—

Drawdowns

Drawdown Indicators

	LSMSX	FMBIX	Difference
Max Drawdown Largest peak-to-trough decline	-15.00%	—	—
Max Drawdown (1Y) Largest decline over 1 year	-2.82%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-7.49%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-15.00%	—	—
Current Drawdown Current decline from peak	-0.23%	—	—
Average Drawdown Average peak-to-trough decline	-2.85%	—	—
Ulcer Index Depth and duration of drawdowns from previous peaks	0.84%	—	—

Volatility

Volatility by Period

	LSMSX	FMBIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.22%	—	—
Volatility (6M) Calculated over the trailing 6-month period	2.07%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	2.88%	—	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.49%	—	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.51%	—	—

LSMSX vs. FMBIX - Expense Ratio Comparison

LSMSX has a 0.01% expense ratio, which is lower than FMBIX's 0.07% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

LSMSX vs. FMBIX - Dividend Comparison

LSMSX's dividend yield for the trailing twelve months is around 3.86%, while FMBIX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
FMBIX Fidelity Municipal Bond Index Fund	0.00%	0.70%	2.60%	2.29%	1.17%	1.28%	1.59%	0.77%	0.00%	0.00%
LSMSX Western Asset SMASh Series TF Fund	3.86%	3.83%	4.30%	3.37%	2.38%	2.73%	2.33%	2.55%	2.34%	0.90%

Frequently Asked Questions

Can I hold both LSMSX and FMBIX in my portfolio?

LSMSX and FMBIX have a correlation of 0.78, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.