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MMIDvsIWRETF Comparison

ETF 1

MMID

MFS Active Mid Cap ETF

This fund is part of

Uncategorized Equities

+0.35%

Full MMID fund page

VS

ETF 2

IWR

iShares Russell Mid-Cap ETF

This fund is part of

US Mid Cap

-0.29%

Full IWR fund page

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. MMID's top 3 sector exposures are Finance, Industrials and Technology. In contrast, IWR's top sector exposures are 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 5.45% year-to-date (YTD) with +$1M in YTD flows. IWR performs better with 13.38% YTD performance, and +$3.08B 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

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Daily, global ETF data for advanced analysis or integration into apps (API), from our partner Trackinsight.

Data Services

Historic performance and flows

Data as of 09/18/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	MMID IWR	-4.46%-3.90%	+1.14%+0.01%	+5.45%+13.38%	n/a+13.24%	n/a+57.82%	n/a+47.07%
Flows	MMID IWR	-+$438M	-$8K-$242M	+$1M+$3.08B	-+$4.75B	-+$10.64B	-+$12.63B

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	MMID IWR	+10.68%+10.75%	n/a+13.67%	n/a+15.93%	n/a+18.27%
Max drawdown	MMID IWR	-6.34%-5.82%	n/a-8.16%	n/a-21.08%	n/a-26.20%
Max drawdown duration	MMID IWR	36d33d	n/a49d	n/a239d	n/a854d

Trading data

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	MMID	IWR
Last sale 9/18/2026 at 1:30 PM	$26.24	$108.21
Previous close 09/17/2026	$26.38	$108.71
Consolidated volume 09/17/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of August 31, 2026

1-year trailing difference

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MMID

is actively managed and doesn’t replicate an index

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	MMID	IWR
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 9/18/2026 at 1:30 PM

Live

Closed

	MMID	IWR
Last price	$26.24	$108.21
1D performance	-0.53%	-0.46%
AuM	$34.87 M	$55.47 B
E/R	0.59%	0.18%

Characteristics

	MMID	IWR
Management strategy	Active	Passive
Provider	MFS	iShares
Benchmark	-	Russell Midcap Index
N° of holdings	105	812
Asset class	-	Equities
Trailing 12m distribution yield	Join	Join
Inception date	September 24, 2025	July 17, 2001
ESG	No	No

More MMID data on Trackinsight

More IWR data on Trackinsight

Exposure

Countries

MMID

USA

84.26%

Other

15.74%

IWR

USA

96.23%

Other

3.77%

Sectors

MMID

Finance

20.64%

Industrials

14.73%

Technology

13.55%

Healthcare

11.23%

Non-Energy Materi.

7.43%

Other

32.42%

IWR

Finance

22.01%

Technology

15.73%

Industrials

14.33%

Healthcare

11.14%

Other

36.79%

Diversification

MMID

Total weight of top 15 holdings out of 15

21.6%

IWR

Total weight of top 15 holdings out of 15

8.16%

Top 15 holdings

Data as of July 31, 2026

MMID

Global Payments, Inc.

1.73%

Diamondback Energy, Inc.

1.66%

Cheniere Energy, Inc.

1.57%

W.W. Grainger, Inc.

1.54%

Waters Corp.

1.52%

Westinghouse Air Brake Technologies Corp.

1.50%

Becton, Dickinson & Co.

1.45%

STERIS Plc (Ireland)

1.42%

Burlington Stores, Inc.

1.38%

M&T Bank Corp.

1.38%

Agilent Technologies, Inc.

1.36%

Kenvue, Inc.

1.30%

Valero Energy Corp.

1.27%

Alliant Energy Corp.

1.27%

Assurant, Inc.

1.25%

IWR

Snowflake, Inc.

0.72%

Marathon Petroleum Corp.

0.67%

Cloudflare, Inc.

0.65%

Datadog, Inc.

0.64%

Phillips 66

0.61%

Royal Caribbean Group

0.59%

Simon Property Group, Inc.

0.53%

Digital Realty Trust, Inc.

0.51%

The Allstate Corp.

0.49%

United Rentals, Inc.

0.48%

Robinhood Markets, Inc.

0.48%

Hewlett Packard Enterprise Co.

0.45%

Kinder Morgan, Inc.

0.45%

Warner Bros. Discovery, Inc.

0.44%

Realty Income Corp.

0.44%

Frequently asked questions about MMID and IWR

How have the MMID and IWR ETFs performed in 2026?

As of September 18, 2026, MMID is up 5.45% year-to-date (YTD), while IWR has returned 13.38%. 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 +$1M in flows, compared to +$3.08B for IWR.

Which ETF is bigger: MMID or IWR?

As of September 18, 2026, MMID holds $34.87 M in assets under management (AUM), while IWR manages $55.47 B.

What sectors do the MMID and IWR ETFs invest in?

MMID leans toward sectors like Finance, Industrials and Technology. Meanwhile, IWR focuses on Finance, Technology and Industrials.

What are the top holdings of the MMID ETF and IWR ETF?

MMID top holdings include Global Payments, Inc., Diamondback Energy, Inc. and Cheniere Energy, Inc.. IWR holds in its top three: Snowflake, Inc., Marathon Petroleum Corp. and Cloudflare, Inc..

MMIDvsIWRETF Comparison

MFS Active Mid Cap ETF

iShares Russell Mid-Cap ETF

MMID vs IWR performance and flow charts

Performance

Cumulative Flows

Get all the metrics on this page, and more, through a reliable ETF data feed

Countries

Sectors

Diversification

Top 15 holdings

How have the MMID and IWR ETFs performed in 2026?

As of September 18, 2026, MMID is up 5.45% year-to-date (YTD), while IWR has returned 13.38%. 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 +$1M in flows, compared to +$3.08B for IWR.

Which ETF is bigger: MMID or IWR?

As of September 18, 2026, MMID holds $34.87 M in assets under management (AUM), while IWR manages $55.47 B.

What sectors do the MMID and IWR ETFs invest in?

MMID leans toward sectors like Finance, Industrials and Technology. Meanwhile, IWR focuses on Finance, Technology and Industrials.

What are the top holdings of the MMID ETF and IWR ETF?

MMID top holdings include Global Payments, Inc., Diamondback Energy, Inc. and Cheniere Energy, Inc.. IWR holds in its top three: Snowflake, Inc., Marathon Petroleum Corp. and Cloudflare, Inc..

Which ETF is more diversified: MMID or IWR?

MMID holds 105 securities with 21.6% of its assets in the top 15. IWR has 823 securities and a top 15 weight of 8.16%.

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