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VOvsSIZEETF Comparison

ETF 1

VO

Vanguard Mid-Cap ETF

This fund is part of

US Mid Cap

+0.85%

Full VO fund page

VS

ETF 2

SIZE

iShares MSCI USA Size Factor ETF

This fund is part of

US Large Cap

+0.54%

Full SIZE fund page

Vanguard Mid-Cap ETF (VO) belongs to the US Mid Cap segment. iShares MSCI USA Size Factor ETF (SIZE) is part of the US Large Cap segment. VO's top 3 sector exposures are Industrials, Information Technology and Financials. In contrast, SIZE's top sector exposures are Information Technology, Industrials and Financials. VO is less expensive with a Total Expense Ratio (TER) of 0.03%, versus 0.15% for SIZE. VO is up 10.45% year-to-date (YTD) with +$4.44B in YTD flows. SIZE performs worse with 9.81% YTD performance, and -$556K in YTD flows. Run a side-by-side ETF comparison of VO and SIZE 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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VO vs SIZE 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 06/12/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	VO SIZE	+3.35%+3.22%	+10.88%+10.83%	+10.45%+9.81%	+18.18%+18.14%	+56.67%+54.62%	+45.68%+47.80%
Flows	VO SIZE	+$1.26B-$103K	+$2.64B+$8M	+$4.44B-$556K	+$9.13B+$31M	+$21.85B-$21M	+$30.55B-$647M

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	VO SIZE	+14.40%+13.70%	+12.75%+12.42%	+14.78%+14.62%	+17.62%+17.11%
Max drawdown	VO SIZE	-3.96%-3.94%	-8.12%-7.92%	-18.93%-18.57%	-27.54%-24.05%
Max drawdown duration	VO SIZE	21d21d	49d49d	211d219d	972d820d

Trading data

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	VO	SIZE
Last sale 6/12/2026 at 1:30 PM	$79.82	$176.78
Previous close 06/11/2026	$79.05	$175.79
Consolidated volume 06/11/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of May 29, 2026

1-year trailing difference

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	VO	SIZE
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 6/12/2026 at 1:30 PM

Live

Closed

	VO	SIZE
Last price	$79.82	$176.78
1D performance	+0.97%	+0.56%
AuM	$104.50 B	$424.51 M
E/R	0.03%	0.15%

Characteristics

	VO	SIZE
Management strategy	Passive	Passive
Provider	Vanguard	iShares
Benchmark	CRSP U.S. Mid Cap Index	MSCI USA Low Size Index
N° of holdings	269	502
Asset class	Equities	Equities
Trailing 12m distribution yield	Join	Join
Inception date	January 26, 2004	April 16, 2013
ESG	No	No

More VO data on Trackinsight

More SIZE data on Trackinsight

Exposure

Countries

VO

USA

92.33%

Other

7.67%

SIZE

USA

92.99%

Other

7.01%

Sectors

VO

Industrials

17.2%

Information Techn.

16.44%

Financials

11.97%

Consumer Discreti.

10.1%

Energy

8.35%

Utilities

8.32%

Other

27.62%

SIZE

Information Techn.

18.13%

Industrials

15.57%

Financials

12.11%

Consumer Discreti.

8.99%

Health Care

8.97%

Other

36.23%

Diversification

VO

Total weight of top 15 holdings out of 15

14.32%

SIZE

Total weight of top 15 holdings out of 15

5.52%

Top 15 holdings

Data as of April 30, 2026

VO

WESTERN DIGITAL

1.49%

SEAGATE TECHNOLOGY HOLDINGS PLC

1.48%

VERTIV HOLDINGS

1.25%

QUANTA SERVICES

1.10%

HOWMET AEROSPACE INC

0.98%

CONSTELLATION ENERGY CORP

0.97%

CUMMINS

0.94%

SCHLUMBERGER

0.86%

CRH PLC

0.80%

VALERO ENERGY

0.76%

MONOLITHIC POWER SYSTEMS

0.75%

ROSS STORES

0.74%

MARATHON PETROLEUM

0.74%

MOTOROLA SOLUTIONS

0.73%

MARVELL TECHNOLOGY

0.73%

SIZE

WESTERN DIGITAL

0.46%

CIENA

0.45%

INTEL-T

0.42%

SEAGATE TECHNOLOGY HOLDINGS PLC

0.41%

BLOOM ENERGY CORP

0.40%

ON SEMICONDUCTOR

0.38%

MICRON TECHNOLOGY

0.35%

TERADYNE

0.35%

KEYSIGHT TECHNOLOGIES

0.34%

COMFORT SYSTEMS USA

0.34%

DOW INC

0.34%

VERTIV HOLDINGS

0.33%

ECHOSTAR

0.32%

MARVELL TECHNOLOGY

0.32%

CORNING

0.32%

Frequently asked questions about VO and SIZE

How have the VO and SIZE ETFs performed in 2026?

As of June 12, 2026, VO is up 10.45% year-to-date (YTD), while SIZE has returned 9.81%. That puts VO better performer ahead so far this year.

Which ETF is attracting more investor money: VO or SIZE?

Year-to-date, the VO ETF saw +$4.44B in flows, compared to -$556K for SIZE.

Which ETF is more volatile: VO or SIZE?

Over the past year, VO had a volatility of 12.75%, while SIZE experienced 12.42%.

Which ETF is bigger: VO or SIZE?

As of June 12, 2026, VO holds $104.50 B in assets under management (AUM), while SIZE manages $424.51 M.

What sectors do the VO and SIZE ETFs invest in?

VO leans toward sectors like Industrials, Information Technology and Financials. Meanwhile, SIZE focuses on Information Technology, Industrials and Financials.

What are the top holdings of the VO ETF and SIZE ETF?

VO top holdings include WESTERN DIGITAL, SEAGATE TECHNOLOGY HOLDINGS PLC and VERTIV HOLDINGS. SIZE holds in its top three: WESTERN DIGITAL, CIENA and INTEL-T.

Which ETF is more diversified: VO or SIZE?

VO holds 289 securities with 14.32% of its assets in the top 15. SIZE has 539 securities and a top 15 weight of 5.52%.

ETFs for contrarian investors

December 21, 2022

SIZE

VOvsSIZEETF Comparison

Vanguard Mid-Cap ETF

iShares MSCI USA Size Factor ETF

VO vs SIZE 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 VO and SIZE ETFs performed in 2026?

As of June 12, 2026, VO is up 10.45% year-to-date (YTD), while SIZE has returned 9.81%. That puts VO better performer ahead so far this year.

Which ETF is attracting more investor money: VO or SIZE?

Year-to-date, the VO ETF saw +$4.44B in flows, compared to -$556K for SIZE.

Which ETF is more volatile: VO or SIZE?

Over the past year, VO had a volatility of 12.75%, while SIZE experienced 12.42%.

Which ETF is bigger: VO or SIZE?

As of June 12, 2026, VO holds $104.50 B in assets under management (AUM), while SIZE manages $424.51 M.

What sectors do the VO and SIZE ETFs invest in?

VO leans toward sectors like Industrials, Information Technology and Financials. Meanwhile, SIZE focuses on Information Technology, Industrials and Financials.

What are the top holdings of the VO ETF and SIZE ETF?

VO top holdings include WESTERN DIGITAL, SEAGATE TECHNOLOGY HOLDINGS PLC and VERTIV HOLDINGS. SIZE holds in its top three: WESTERN DIGITAL, CIENA and INTEL-T.

Which ETF is more diversified: VO or SIZE?

VO holds 289 securities with 14.32% of its assets in the top 15. SIZE has 539 securities and a top 15 weight of 5.52%.

ETFs for contrarian investors

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