SIZEvsVOETF Comparison
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iShares MSCI USA Size Factor ETF (SIZE) belongs to the US Large Cap segment. Vanguard Morningstar Mid-Cap ETF (VO) is part of the US Mid Cap segment. Both ETFs have the same top 3 sector exposures: Finance, Technology and Industrials. SIZE is more expensive with a Total Expense Ratio (TER) of 0.15%, versus 0.03% for VO. SIZE is up 12.81% year-to-date (YTD) with -$556K in YTD flows. VO performs better with 13.64% YTD performance, and +$5.01B in YTD flows. Run a side-by-side ETF comparison of SIZE and VO 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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SIZE vs VO performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/28/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SIZE VO | +3.00%+3.24% | +0.14%+0.63% | +12.81%+13.64% | +13.19%+12.86% | +69.98%+74.01% | +43.82%+39.78% |
| Flows | SIZE VO | --$23M | -+$602M | -$556K+$5.01B | +$16M+$6.91B | -$9M+$21.22B | -$299M+$28.76B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SIZE VO | +10.47%+10.58% | +12.07%+12.44% | +14.36%+14.54% | +17.04%+17.51% |
| Max drawdown | SIZE VO | -6.56%-6.83% | -7.92%-8.12% | -18.57%-18.93% | -24.05%-27.54% |
| Max drawdown duration | SIZE VO | 76d73d | 49d49d | 219d211d | 820d972d |
Trading data
SIZE | VO | |
Last sale 10/28/2026 at 1:30 PM | $180.45 | $81.57 |
| Previous close 10/28/2026 | $180.62 | $81.45 |
| Consolidated volume 10/28/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of September 30, 2026
1-year trailing difference
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SIZE | VO | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 10/28/2026 at 1:30 PM
Live
Closed
SIZE | VO | |
|---|---|---|
| Last price | $180.45 | $81.57 |
| 1D performance | -0.09% | +0.15% |
| AuM | $433.32 M | $107.38 B |
| E/R | 0.15% | 0.03% |
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Exposure
Countries
SIZE
USA
94.8%
Other
5.2%
VO
USA
95.4%
Other
4.6%
Sectors
SIZE
Finance
21.7%
Technology
17.25%
Industrials
13.27%
Healthcare
12%
Consumer Non-Cycl.
7.12%
Other
28.67%
VO
Finance
20.58%
Technology
16.83%
Industrials
16.07%
Energy
8.72%
Healthcare
8.54%
Utilities
7.66%
Other
21.61%
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Diversification
SIZE
Total weight of top 15 holdings out of 15
4.85%
VO
Total weight of top 15 holdings out of 15
13.12%
Top 15 holdings
Data as of August 31, 2026
SIZE
Atlassian Corp.
0.42%
Okta, Inc.
0.39%
Equity Residential
0.37%
SharkNinja, Inc.
0.36%
Snowflake, Inc.
0.35%
Dell Technologies, Inc.
0.34%
Veeva Systems, Inc.
0.33%
Natera, Inc.
0.31%
Hewlett Packard Enterprise Co.
0.29%
NetApp, Inc.
0.29%
Illumina, Inc.
0.28%
Genuine Parts Co.
0.28%
Workday, Inc.
0.28%
Toast, Inc.
0.28%
IQVIA Holdings, Inc.
0.28%
VO
Marathon Petroleum Corp.
1.04%
Valero Energy Corp.
1.01%
Vertiv Holdings Co.
0.95%
Phillips 66
0.94%
Howmet Aerospace, Inc.
0.93%
Cloudflare, Inc.
0.93%
Seagate Technology Holdings Plc
0.88%
Quanta Services, Inc.
0.87%
SLB Ltd.
0.86%
Constellation Energy Corp.
0.85%
DoorDash, Inc.
0.82%
Robinhood Markets, Inc.
0.79%
Motorola Solutions, Inc.
0.77%
Datadog, Inc.
0.75%
Cummins, Inc.
0.74%
Frequently asked questions about SIZE and VO
How have the SIZE and VO ETFs performed in 2026?
As of October 28, 2026, SIZE is up 12.81% year-to-date (YTD), while VO has returned 13.64%. That puts VO better performer ahead so far this year.
Which ETF is attracting more investor money: SIZE or VO?
Year-to-date, the SIZE ETF saw -$556K in flows, compared to +$5.01B for VO.
Which ETF is more volatile: SIZE or VO?
Over the past year, SIZE had a volatility of 12.07%, while VO experienced 12.44%.
Which ETF is bigger: SIZE or VO?
As of October 28, 2026, SIZE holds $433.32 M in assets under management (AUM), while VO manages $107.38 B.
What sectors do the SIZE and VO ETFs invest in?
SIZE leans toward sectors like Finance, Technology and Industrials. Meanwhile, VO focuses on Finance, Technology and Industrials.
What are the top holdings of the SIZE ETF and VO ETF?
SIZE top holdings include Atlassian Corp., Okta, Inc. and Equity Residential. VO holds in its top three: Marathon Petroleum Corp., Valero Energy Corp. and Vertiv Holdings Co..
Which ETF is more diversified: SIZE or VO?
SIZE holds 516 securities with 4.85% of its assets in the top 15. VO has 280 securities and a top 15 weight of 13.12%.
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