FMBIX vs. CBTAX

Last updated Apr 2, 2026

Compare and contrast key facts about Fidelity Municipal Bond Index Fund (FMBIX) and Six Circles Tax Aware Bond Fund (CBTAX).

FMBIX is managed by Fidelity. It was launched on Jul 11, 2019. CBTAX is managed by Six Circles. It was launched on May 18, 2020.

Performance

FMBIX vs. CBTAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Municipal Bond Index Fund (FMBIX) and Six Circles Tax Aware Bond Fund (CBTAX). The values are adjusted to include any dividend payments, if applicable.

FMBIX vs. CBTAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
FMBIX Fidelity Municipal Bond Index Fund	0.00%	0.60%	1.32%	5.89%	-10.00%	1.14%	4.72%
CBTAX Six Circles Tax Aware Bond Fund	-0.26%	4.13%	2.38%	6.35%	-7.47%	0.89%	5.02%

Returns By Period

FMBIX

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

CBTAX

• 1D: 0.31%
• 1M: -2.01%
• YTD: -0.26%
• 6M: 1.04%
• 1Y: 3.71%
• 3Y*: 3.32%
• 5Y*: 1.19%
• 10Y*: —

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

FMBIX vs. CBTAX - Expense Ratio Comparison

FMBIX has a 0.07% expense ratio, which is lower than CBTAX's 0.14% 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%.

CBTAX

Six Circles Tax Aware Bond Fund

FMBIX

Fidelity Municipal Bond Index Fund

Return for Risk

FMBIX vs. CBTAX — Risk / Return Rank

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

CBTAX

CBTAX Risk / Return Rank: 41
CBTAX Sharpe Ratio Rank: 43
CBTAX Sortino Ratio Rank: 34
CBTAX Omega Ratio Rank: 68
CBTAX Calmar Ratio Rank: 32
CBTAX 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.

FMBIX vs. CBTAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Municipal Bond Index Fund (FMBIX) and Six Circles Tax Aware Bond Fund (CBTAX). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	FMBIX	CBTAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	0.96	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.35	—
Sharpe Ratio (All Time) Calculated using the full available price history	—	0.56	—

Correlation

The correlation between FMBIX and CBTAX is 0.80, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

FMBIX vs. CBTAX - Dividend Comparison

FMBIX has not paid dividends to shareholders, while CBTAX's dividend yield for the trailing twelve months is around 3.23%.

	TTM	2025	2024	2023	2022	2021	2020	2019
FMBIX Fidelity Municipal Bond Index Fund	0.00%	0.70%	2.60%	2.29%	1.17%	1.28%	1.59%	0.77%
CBTAX Six Circles Tax Aware Bond Fund	3.23%	3.49%	3.28%	2.68%	1.57%	0.88%	0.49%	0.00%

Drawdowns

Drawdown Indicators

	FMBIX	CBTAX	Difference
Max Drawdown Largest peak-to-trough decline	—	-12.12%	—
Max Drawdown (1Y) Largest decline over 1 year	—	-4.30%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-12.12%	—
Current Drawdown Current decline from peak	—	-2.21%	—
Average Drawdown Average peak-to-trough decline	—	-2.82%	—
Ulcer Index Depth and duration of drawdowns from previous peaks	—	1.20%	—

Volatility

Volatility by Period

	FMBIX	CBTAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.99%	—
Volatility (6M) Calculated over the trailing 6-month period	—	1.40%	—
Volatility (1Y) Calculated over the trailing 1-year period	—	4.23%	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	—	3.38%	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	—	3.18%	—