MFSB vs. BRSM

Last updated Jul 11, 2026

MFSB (MFS Active Core Plus Bond ETF) and BRSM (MFS Blended Research Small-Mid Cap ETF) are both exchange-traded funds - MFSB is a Intermediate Core-Plus Bond fund actively managed by MFS, while BRSM is a Mid Cap Blend Equities fund actively managed by MFS. Both are actively managed. At a 0.33 correlation, their price movements are largely independent. MFSB charges 0.34%/yr vs 0.38%/yr for BRSM.

Performance

MFSB vs. BRSM - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Active Core Plus Bond ETF (MFSB) and MFS Blended Research Small-Mid Cap ETF (BRSM). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

MFSB

• 1D: -0.04%
• 1M: -0.16%
• 6M: 0.50%
• YTD: 0.68%
• 1Y: 4.87%
• 3Y*: —
• 5Y*: —
• 10Y*: —

BRSM

• 1D: -0.05%
• 1M: 1.42%
• 6M: —
• YTD: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

MFSB vs. BRSM - Yearly Performance Comparison

	2026 (YTD)
MFSB MFS Active Core Plus Bond ETF	0.12%
BRSM MFS Blended Research Small-Mid Cap ETF	2.71%

Correlation

The correlation between MFSB and BRSM is 0.33, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (All Time) Calculated using the full available price history since Jun 4, 2026	0.33

Return for Risk

MFSB vs. BRSM — Risk / Return Rank

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

MFSB

MFSB Risk / Return Rank: 42
MFSB Sharpe Ratio Rank: 45
MFSB Sortino Ratio Rank: 45
MFSB Omega Ratio Rank: 41
MFSB Calmar Ratio Rank: 40
MFSB Martin Ratio Rank: 40

BRSM

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

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.

MFSB vs. BRSM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Active Core Plus Bond ETF (MFSB) and MFS Blended Research Small-Mid Cap ETF (BRSM). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	MFSB	BRSM	Difference
Sharpe ratio: Return per unit of total volatility	1.26	—	—
Sortino ratio: Return per unit of downside risk	1.84	—	—
Omega ratio: Gain probability vs. loss probability	1.22	—	—
Calmar ratio: Return relative to maximum drawdown	1.65	—	—
Martin ratio: Return relative to average drawdown	4.95	—	—

Drawdowns

MFSB vs. BRSM - Drawdown Comparison

The maximum MFSB drawdown since its inception was -3.19%, roughly equal to the maximum BRSM drawdown of -3.25%. Use the drawdown chart below to compare losses from any high point for MFSB and BRSM.

Drawdown Indicators

	MFSB	BRSM	Difference
Max Drawdown Largest peak-to-trough decline	-3.19%	-3.25%	+0.06%
Max Drawdown (1Y) Largest decline over 1 year	-2.71%	—	—
Current Drawdown Current decline from peak	-1.14%	-1.46%	+0.32%
Average Drawdown Average peak-to-trough decline	-0.83%	-1.01%	+0.18%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.90%	—	—

Volatility

Volatility by Period

	MFSB	BRSM	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.05%	—	—
Volatility (6M) Calculated over the trailing 6-month period	2.82%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	3.53%	19.63%	-16.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.19%	19.63%	-15.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.19%	19.63%	-15.44%

MFSB vs. BRSM - Expense Ratio Comparison

MFSB has a 0.34% expense ratio, which is lower than BRSM's 0.38% expense ratio.

Dividends

MFSB vs. BRSM - Dividend Comparison

MFSB's dividend yield for the trailing twelve months is around 4.63%, while BRSM has not paid dividends to shareholders.

Position	TTM	2025	2024
BRSM MFS Blended Research Small-Mid Cap ETF	0.00%	0.00%	0.00%
MFSB MFS Active Core Plus Bond ETF	4.63%	4.58%	0.37%

Frequently Asked Questions

Can I hold both MFSB and BRSM in my portfolio?

MFSB and BRSM have a correlation of 0.33, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, MFSB or BRSM?

On fees, MFSB is cheaper at 0.34% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, MFSB or BRSM?

MFSB is cheaper with a 0.34% expense ratio, compared with 0.38% for BRSM.

Which ETF pays a higher dividend yield, MFSB or BRSM?

MFSB has the higher dividend yield at 4.63%, compared with 0.00% for BRSM.

What is the main difference between MFSB and BRSM?

MFSB is categorized as Intermediate Core-Plus Bond, while BRSM is Mid Cap Blend Equities. Their fees differ too: 0.34% for MFSB and 0.38% for BRSM.