MMID vs. BRSM

Last updated Jul 18, 2026

MMID (MFS Active Mid Cap ETF) and BRSM (MFS Blended Research Small-Mid Cap ETF) are both Mid Cap Blend Equities funds from MFS. Both are actively managed. A 0.59 correlation means they provide meaningful diversification when combined. MMID charges 0.59%/yr vs 0.38%/yr for BRSM.

Performance

MMID vs. BRSM - Performance Comparison

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

Returns By Period

MMID

• 1D: -0.40%
• 1M: 3.23%
• 6M: 2.33%
• YTD: 6.30%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

BRSM

• 1D: -0.42%
• 1M: 2.10%
• 6M: —
• YTD: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

MMID vs. BRSM - Yearly Performance Comparison

	2026 (YTD)
MMID MFS Active Mid Cap ETF	3.93%
BRSM MFS Blended Research Small-Mid Cap ETF	2.35%

Correlation

The correlation between MMID and BRSM is 0.59, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (All Time) Calculated using the full available price history since Jun 4, 2026	0.59

Return for Risk

MMID vs. BRSM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Active Mid Cap ETF (MMID) 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.

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

Drawdowns

MMID vs. BRSM - Drawdown Comparison

The maximum MMID drawdown since its inception was -7.93%, which is greater than BRSM's maximum drawdown of -3.25%. Use the drawdown chart below to compare losses from any high point for MMID and BRSM.

Drawdown Indicators

	MMID	BRSM	Difference
Max Drawdown Largest peak-to-trough decline	-7.93%	-3.25%	-4.68%
Current Drawdown Current decline from peak	-0.40%	-1.82%	+1.42%
Average Drawdown Average peak-to-trough decline	-1.95%	-1.12%	-0.83%

Volatility

Volatility by Period

	MMID	BRSM	Difference
Volatility (1Y) Calculated over the trailing 1-year period	13.27%	18.03%	-4.76%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.27%	18.03%	-4.76%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.27%	18.03%	-4.76%

MMID vs. BRSM - Expense Ratio Comparison

MMID has a 0.59% expense ratio, which is higher than BRSM's 0.38% expense ratio.

Dividends

MMID vs. BRSM - Dividend Comparison

MMID's dividend yield for the trailing twelve months is around 0.69%, while BRSM has not paid dividends to shareholders.

Position	TTM	2025
BRSM MFS Blended Research Small-Mid Cap ETF	0.00%	0.00%
MMID MFS Active Mid Cap ETF	0.69%	0.28%

Frequently Asked Questions

Can I hold both MMID and BRSM in my portfolio?

MMID and BRSM have a correlation of 0.59, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, MMID or BRSM?

On fees, BRSM is cheaper at 0.38% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, MMID or BRSM?

BRSM is cheaper with a 0.38% expense ratio, compared with 0.59% for MMID.

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

MMID has the higher dividend yield at 0.69%, compared with 0.00% for BRSM.

What is the main difference between MMID and BRSM?

Their fees differ too: 0.59% for MMID and 0.38% for BRSM.