SIZE vs VOO
iShares MSCI USA Size Factor ETF vs Vanguard S&P 500 ETF
Which is better, SIZE or VOO?
Nearly the same fund. VOO costs less.
VOO has a lower expense ratio. VOO led over 1Y, 3Y, 5Y and the full window. The two have moved almost in lockstep, correlation 0.95. SIZE is less concentrated, with 3.0% of the fund in its ten largest positions against 36.4%.
MarketXLS is not an investment adviser. This comparison is generated automatically from market data and is for information only. A Best mark means the better reading on that one measure, not a recommendation to buy.
Side-by-Side Comparison
| Metric | SIZE | VOO |
|---|---|---|
| Expense Ratio | 0.15% | 0.03%Best |
| AUM | $434M | $997.4B |
| Dividend Yield | 1.33% | 1.04% |
| Holdings | 533 | 509 |
| YTD Return | +10.82% | +12.50%Best |
| 1Y Return | +12.44% | +17.58%Best |
| 3Y Return (annualized) | +15.33% | +21.27%Best |
| 5Y Return (annualized) | +7.86% | +12.95%Best |
| Volatility (annualized) | 15.3% | 14.4%Best |
| Max Drawdown | -39.1% | -34.3%Best |
| $10,000 over 5 years | $14,598 | $18,384Best |
| Top 10 Weight | 3.0%Best | 36.4% |
| Fund Family | iShares by BlackRock (US) | Vanguard (US) |
| Category | Equity | Equity |
| Style | Large Cap Blend | Large Cap Blend |
| Inception | Apr 16, 2013 | Sep 7, 2010 |
Volatility and max drawdown are measured over the window both funds cover: Apr 18, 2013 to Sep 11, 2026 (13.4 years).
SIZE vs VOO growth
Month-end closes. Both lines start at 0% in the first month shown, so the gap between them is the difference in growth across that window. The full view covers the 13.4 years both funds cover.
SIZE vs VOO Performance
iShares MSCI USA Size Factor ETF (SIZE) is an ETF from iShares by BlackRock (US) and Vanguard S&P 500 ETF (VOO) is an ETF from Vanguard (US). Over the past year SIZE returned +12.44% while VOO returned +17.58%. Year to date, SIZE is up 10.82% versus a gain of 12.50% for VOO.
Over three years, SIZE compounded at +15.33% per year against +21.27% for VOO; over five years the annualized figures are +7.86% and +12.95% respectively. Across the full 13-year window we track, VOO has the edge at +13.40% annualized vs +10.64%.
Past performance does not guarantee future results.
Risk: Volatility and Drawdowns
SIZE has been the more volatile fund, with annualized monthly volatility of 15.3% compared with 14.4% for VOO. Lower volatility generally means a smoother ride, though it often comes with lower long-run returns.
The deepest peak-to-trough decline in our data was -39.1% for SIZE and -34.3% for VOO. Drawdown depth is what each fund did in the worst stretch of the window measured above.
The two funds' monthly returns correlate at 0.95. They move almost in lockstep, so holding both mostly duplicates the same exposure.
Fees and Cost Over Time
SIZE charges 0.15% per year while VOO charges 0.03%. On a $10,000 position that is $15 vs $3 annually, a gap of $12 per year that compounds over a long holding period. On income, SIZE currently yields 1.33% against 1.04% for VOO.
Holdings Overlap
82.8% of SIZE's money is in holdings VOO also owns. 97.7% of VOO's money is in holdings SIZE also owns.
Most of VOO is already inside SIZE. Owning both mostly buys the same companies twice.
440 positions in common, counted across the 528 positions we hold weights for in SIZE and 505 in VOO, against full books of 533 and 509.
What only one of them owns
Our book lists 59 positions for VOO that do not appear in our book for SIZE (1.9% of the fund), and 73 for SIZE that do not appear in VOO (14.3%).
Some of those will be the same company recorded under a different code in one of the two books, so the real difference in what you would own is no larger than this and may be smaller. We do not name the individual positions here for that reason.
Top Shared Holdings
| Stock | Weight in SIZE | Weight in VOO | Difference |
|---|---|---|---|
| NVDANvidia Corp. | 0.15% | 7.51% | 7.36% |
| AAPLApple, Inc | 0.15% | 6.59% | 6.44% |
| MSFTMicrosoft Corp 4.100 Feb 06 37 | 0.18% | 4.30% | 4.12% |
| AMZNAmazon.Com Inc | 0.16% | 3.62% | 3.46% |
| GOOGLAlphabet A Usd 0.001 | 0.08% | 3.25% | 3.17% |
| AVGOBroadcom Inc | 0.16% | 2.77% | 2.61% |
| GOOGAlphabet Inc | 0.06% | 2.59% | 2.53% |
| MUMicron Technology, Inc. | 0.20% | 2.02% | 1.82% |
| METAMeta Platforms, Inc. | 0.15% | 1.92% | 1.77% |
| TSLATesla Inc | 0.12% | 1.84% | 1.72% |
97.7% of VOO is already inside SIZE.
You probably hold more than these two. Add the rest and see how much of the whole book is the same companies twice.
Free for up to 10 holdings. No account needed.
Frequently Asked Questions
Which is cheaper, SIZE or VOO?
SIZE has an expense ratio of 0.15% while VOO charges 0.03%. VOO is the cheaper option, by $12 a year on a $10,000 investment.
Which performed better, SIZE or VOO?
Over the past year SIZE returned +12.44% vs +17.58% for VOO, so VOO leads on 1-year performance. Over the longest common window we track (13 years), SIZE annualized +10.64% vs +13.40% for VOO. Past performance does not guarantee future results. This is information, not a recommendation.
Which is riskier, SIZE or VOO?
SIZE has been the more volatile fund at 15.3% annualized versus 14.4% for VOO. Worst drawdown: SIZE -39.1% vs VOO -34.3%.
Should I hold both SIZE and VOO?
SIZE and VOO have a monthly-return correlation of 0.95, so they move almost identically. What is left to separate them is the fee and the index each one tracks. This is information, not a recommendation.
What is the holdings overlap between SIZE and VOO?
97.7% of VOO's money is in holdings SIZE also owns. 97.7% of VOO's is in holdings SIZE also owns. They hold 440 positions in common, counted across the 528 positions we hold weights for in SIZE and 505 in VOO.
Which pays a higher dividend, SIZE or VOO?
SIZE yields 1.33% while VOO yields 1.04%, so SIZE currently pays the higher dividend yield.
Is VOO better than SIZE?
VOO has a lower expense ratio. VOO led over 1Y, 3Y, 5Y and the full window. The two have moved almost in lockstep, correlation 0.95. SIZE is less concentrated, with 3.0% of the fund in its ten largest positions against 36.4%. Which one suits a particular account depends on what it is for. This is information, not a recommendation.