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MMIDvsONEOETF 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

ONEO

State Street SPDR Russell 1000 Momentum Focus ETF

This fund is part of

US Multi-Factor

-0.03%

Full ONEO fund page

MFS Active Mid Cap ETF (MMID) belongs to the Uncategorized Equities segment. State Street SPDR Russell 1000 Momentum Focus ETF (ONEO) is part of the US Multi-Factor segment. MMID's top 3 sector exposures are Finance, Industrials and Technology. In contrast, ONEO's top sector exposures are Industrials, Finance and Technology. MMID is more expensive with a Total Expense Ratio (TER) of 0.59%, versus 0.2% for ONEO. MMID is up 5.45% year-to-date (YTD) with +$1M in YTD flows. ONEO performs better with 17.55% YTD performance, and -$24M in YTD flows. Run a side-by-side ETF comparison of MMID and ONEO 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 ONEO 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 ONEO	-4.46%-3.89%	+1.14%-0.47%	+5.45%+17.55%	n/a+18.20%	n/a+62.98%	n/a+64.61%
Flows	MMID ONEO	--	-$8K+$2M	+$1M-$24M	--$73M	--$166M	--$319M

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	MMID ONEO	+10.68%+9.85%	n/a+13.11%	n/a+15.18%	n/a+17.28%
Max drawdown	MMID ONEO	-6.34%-5.28%	n/a-7.42%	n/a-19.59%	n/a-22.42%
Max drawdown duration	MMID ONEO	36d33d	n/a48d	n/a260d	n/a757d

Trading data

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	MMID	ONEO
Last sale 9/18/2026 at 1:30 PM	$26.24	$151.03
Previous close 09/17/2026	$26.38	$151.90
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	ONEO
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	ONEO
Last price	$26.24	$151.03
1D performance	-0.53%	-0.57%
AuM	$34.87 M	$30.21 M
E/R	0.59%	0.2%

Characteristics

	MMID	ONEO
Management strategy	Active	Passive
Provider	MFS	State Street Investment Management
Benchmark	-	Russell 1000 Momentum Focused Factor Index
N° of holdings	105	917
Asset class	-	Equities
Trailing 12m distribution yield	Join	Join
Inception date	September 24, 2025	December 2, 2015
ESG	No	No

More MMID data on Trackinsight

More ONEO data on Trackinsight

Exposure

Countries

MMID

USA

84.26%

Other

15.74%

ONEO

USA

94.84%

Other

5.16%

Sectors

MMID

Finance

20.64%

Industrials

14.73%

Technology

13.55%

Healthcare

11.23%

Non-Energy Materi.

7.43%

Other

32.42%

ONEO

Industrials

15.9%

Finance

15.32%

Technology

14.66%

Healthcare

11.55%

Consumer Non-Cycl.

8.16%

Non-Energy Materi.

7.9%

Other

26.51%

Diversification

MMID

Total weight of top 15 holdings out of 15

21.6%

ONEO

Total weight of top 15 holdings out of 15

8.03%

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%

ONEO

The Allstate Corp.

0.68%

Anglogold Ashanti Plc

0.67%

Archer-Daniels-Midland Co.

0.62%

Expedia Group, Inc.

0.59%

Delta Air Lines, Inc.

0.57%

CF Industries Holdings, Inc.

0.54%

Regeneron Pharmaceuticals, Inc.

0.54%

Zoom Communications, Inc.

0.52%

McKesson Corp.

0.50%

Edison International

0.49%

Ovintiv, Inc.

0.48%

TechnipFMC plc

0.47%

CVS Health Corp.

0.46%

Permian Resources Corp.

0.45%

Devon Energy Corp.

0.45%

Frequently asked questions about MMID and ONEO

How have the MMID and ONEO ETFs performed in 2026?

As of September 18, 2026, MMID is up 5.45% year-to-date (YTD), while ONEO has returned 17.55%. That puts ONEO better performer ahead so far this year.

Which ETF is attracting more investor money: MMID or ONEO?

Year-to-date, the MMID ETF saw +$1M in flows, compared to -$24M for ONEO.

Which ETF is bigger: MMID or ONEO?

As of September 18, 2026, MMID holds $34.87 M in assets under management (AUM), while ONEO manages $30.21 M.

What sectors do the MMID and ONEO ETFs invest in?

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

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

MMID top holdings include Global Payments, Inc., Diamondback Energy, Inc. and Cheniere Energy, Inc.. ONEO holds in its top three: The Allstate Corp., Anglogold Ashanti Plc and Archer-Daniels-Midland Co..

MMIDvsONEOETF Comparison

MFS Active Mid Cap ETF

State Street SPDR Russell 1000 Momentum Focus ETF

MMID vs ONEO 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 ONEO ETFs performed in 2026?

As of September 18, 2026, MMID is up 5.45% year-to-date (YTD), while ONEO has returned 17.55%. That puts ONEO better performer ahead so far this year.

Which ETF is attracting more investor money: MMID or ONEO?

Year-to-date, the MMID ETF saw +$1M in flows, compared to -$24M for ONEO.

Which ETF is bigger: MMID or ONEO?

As of September 18, 2026, MMID holds $34.87 M in assets under management (AUM), while ONEO manages $30.21 M.

What sectors do the MMID and ONEO ETFs invest in?

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

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

MMID top holdings include Global Payments, Inc., Diamondback Energy, Inc. and Cheniere Energy, Inc.. ONEO holds in its top three: The Allstate Corp., Anglogold Ashanti Plc and Archer-Daniels-Midland Co..

Which ETF is more diversified: MMID or ONEO?

MMID holds 105 securities with 21.6% of its assets in the top 15. ONEO has 924 securities and a top 15 weight of 8.03%.

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