MMIDvsIWRETF Comparison
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MFS Active Mid Cap ETF (MMID) belongs to the Uncategorized Equities segment. iShares Russell Mid-Cap ETF (IWR) is part of the US Mid Cap segment. Both ETFs have the same top 3 sector exposures: Finance, Technology and Industrials. MMID is more expensive with a Total Expense Ratio (TER) of 0.59%, versus 0.18% for IWR. MMID is up 12.14% year-to-date (YTD) with +$2M in YTD flows. IWR performs better with 15.56% YTD performance, and +$4.70B in YTD flows. Run a side-by-side ETF comparison of MMID and IWR below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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MMID vs IWR performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 11/02/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | MMID IWR | +7.28%+1.89% | +2.70%-0.35% | +12.14%+15.56% | +14.55%+16.91% | n/a+69.67% | n/a+41.11% |
| Flows | MMID IWR | +$788K+$1.28B | +$788K+$1.87B | +$2M+$4.70B | +$6M+$5.88B | -+$12.19B | -+$14.03B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | MMID IWR | +11.19%+11.42% | +12.57%+13.49% | n/a+15.70% | n/a+18.23% |
| Max drawdown | MMID IWR | -7.95%-6.83% | -7.98%-8.16% | n/a-21.08% | n/a-26.20% |
| Max drawdown duration | MMID IWR | 81d78d | 136d49d | n/a239d | n/a854d |
Trading data
MMID | IWR | |
Last sale 11/3/2026 at 2:30 PM | $27.71 | $110.35 |
| Previous close 11/02/2026 | $27.82 | $110.32 |
| Consolidated volume 11/02/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of October 30, 2026
1-year trailing difference
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MMID
is actively managed and doesn’t replicate an indexMMID | IWR | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
Main metrics
Last update 11/3/2026 at 2:30 PM
Live
Closed
MMID | IWR | |
|---|---|---|
| Last price | $27.71 | $110.35 |
| 1D performance | -0.40% | +0.03% |
| AuM | $37.82 M | $58.17 B |
| E/R | 0.59% | 0.18% |
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Exposure
Countries
MMID
USA
85.47%
Other
14.53%
IWR
USA
95.79%
Other
4.21%
Sectors
MMID
Finance
19.84%
Technology
14.77%
Industrials
14.5%
Healthcare
12.53%
Non-Energy Materi.
7.24%
Other
31.12%
IWR
Finance
20.74%
Technology
17.64%
Industrials
13.87%
Healthcare
12.44%
Other
35.31%
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Diversification
MMID
Total weight of top 15 holdings out of 15
22.5%
IWR
Total weight of top 15 holdings out of 15
9.35%
Top 15 holdings
Data as of September 30, 2026
MMID
Waters Corp.
1.85%
Agilent Technologies, Inc.
1.77%
Global Payments, Inc.
1.76%
Cheniere Energy, Inc.
1.67%
Becton, Dickinson & Co.
1.64%
Diamondback Energy, Inc.
1.57%
Westinghouse Air Brake Technologies Corp.
1.55%
W.W. Grainger, Inc.
1.45%
Valero Energy Corp.
1.42%
STERIS Plc (Ireland)
1.37%
Snowflake, Inc.
1.33%
Microchip Technology, Inc.
1.30%
M&T Bank Corp.
1.27%
nVent Electric Plc
1.27%
Permian Resources Corp.
1.27%
IWR
Marathon Petroleum Corp.
0.87%
Snowflake, Inc.
0.85%
Cloudflare, Inc.
0.83%
Phillips 66
0.77%
Datadog, Inc.
0.68%
Robinhood Markets, Inc.
0.65%
Hewlett Packard Enterprise Co.
0.64%
Lumentum Holdings, Inc.
0.56%
Warner Bros. Discovery, Inc.
0.56%
Moderna, Inc.
0.53%
Royal Caribbean Group
0.50%
Digital Realty Trust, Inc.
0.49%
Simon Property Group, Inc.
0.48%
Teradyne, Inc.
0.47%
United Rentals, Inc.
0.47%
Frequently asked questions about MMID and IWR
How have the MMID and IWR ETFs performed in 2026?
As of November 2, 2026, MMID is up 12.14% year-to-date (YTD), while IWR has returned 15.56%. That puts IWR better performer ahead so far this year.
Which ETF is attracting more investor money: MMID or IWR?
Year-to-date, the MMID ETF saw +$2M in flows, compared to +$4.70B for IWR.
Which ETF is more volatile: MMID or IWR?
Over the past year, MMID had a volatility of 12.57%, while IWR experienced 13.49%.
Which ETF is bigger: MMID or IWR?
As of November 2, 2026, MMID holds $37.82 M in assets under management (AUM), while IWR manages $58.17 B.
What sectors do the MMID and IWR ETFs invest in?
MMID leans toward sectors like Finance, Technology and Industrials. Meanwhile, IWR focuses on Finance, Technology and Industrials.
What are the top holdings of the MMID ETF and IWR ETF?
MMID top holdings include Waters Corp., Agilent Technologies, Inc. and Global Payments, Inc.. IWR holds in its top three: Marathon Petroleum Corp., Snowflake, Inc. and Cloudflare, Inc..
Which ETF is more diversified: MMID or IWR?
MMID holds 104 securities with 22.5% of its assets in the top 15. IWR has 823 securities and a top 15 weight of 9.35%.
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