VOvsSIZEETF Comparison
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Vanguard Morningstar 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. Both ETFs have the same top 3 sector exposures: Finance, Technology and Industrials. VO is less expensive with a Total Expense Ratio (TER) of 0.03%, versus 0.15% for SIZE. VO is up 13.47% year-to-date (YTD) with +$4.98B in YTD flows. SIZE performs worse with 12.8% 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
Historic performance and flows
Data as of 10/27/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | VO SIZE | +3.09%+3.00% | +0.90%+1.09% | +13.47%+12.80% | +11.57%+12.16% | +74.51%+71.27% | +41.43%+45.44% |
| Flows | VO SIZE | -$54M- | +$573M- | +$4.98B-$556K | +$6.88B+$16M | +$21.20B-$9M | +$28.79B-$299M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | VO SIZE | +10.61%+10.63% | +12.48%+12.11% | +14.54%+14.36% | +17.52%+17.05% |
| Max drawdown | VO SIZE | -6.83%-6.56% | -8.12%-7.92% | -18.93%-18.57% | -27.54%-24.05% |
| Max drawdown duration | VO SIZE | 72d75d | 49d49d | 211d219d | 972d820d |
Trading data
VO | SIZE | |
Last sale 10/28/2026 at 1:43 PM | $81.36 | $180.35 |
| Previous close 10/27/2026 | $81.45 | $180.11 |
| Consolidated volume 10/27/2026 | ||
| 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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VO | SIZE | |
|---|---|---|
| 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 1:43 PM
Live
Closed
VO | SIZE | |
|---|---|---|
| Last price | $81.36 | $180.35 |
| 1D performance | -0.11% | +0.13% |
| AuM | $107.19 B | $433.28 M |
| E/R | 0.03% | 0.15% |
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Exposure
Countries
VO
USA
95.4%
Other
4.6%
SIZE
USA
94.8%
Other
5.2%
Sectors
VO
Finance
20.58%
Technology
16.83%
Industrials
16.07%
Energy
8.72%
Healthcare
8.54%
Utilities
7.66%
Other
21.61%
SIZE
Finance
21.7%
Technology
17.25%
Industrials
13.27%
Healthcare
12%
Consumer Non-Cycl.
7.12%
Other
28.67%
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Diversification
VO
Total weight of top 15 holdings out of 15
13.12%
SIZE
Total weight of top 15 holdings out of 15
4.85%
Top 15 holdings
Data as of August 31, 2026
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%
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%
Frequently asked questions about VO and SIZE
How have the VO and SIZE ETFs performed in 2026?
As of October 27, 2026, VO is up 13.47% year-to-date (YTD), while SIZE has returned 12.8%. 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 +$4.98B in flows, compared to -$556K for SIZE.
Which ETF is more volatile: VO or SIZE?
Over the past year, VO had a volatility of 12.48%, while SIZE experienced 12.11%.
Which ETF is bigger: VO or SIZE?
As of October 27, 2026, VO holds $107.19 B in assets under management (AUM), while SIZE manages $433.28 M.
What sectors do the VO and SIZE ETFs invest in?
VO leans toward sectors like Finance, Technology and Industrials. Meanwhile, SIZE focuses on Finance, Technology and Industrials.
What are the top holdings of the VO ETF and SIZE ETF?
VO top holdings include Marathon Petroleum Corp., Valero Energy Corp. and Vertiv Holdings Co.. SIZE holds in its top three: Atlassian Corp., Okta, Inc. and Equity Residential.
Which ETF is more diversified: VO or SIZE?
VO holds 280 securities with 13.12% of its assets in the top 15. SIZE has 516 securities and a top 15 weight of 4.85%.
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Latest news about VO & SIZE
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