VOO vs. OEF
VOO (Vanguard S&P 500 ETF) and OEF (iShares S&P 100 ETF) are both exchange-traded funds - VOO is a S&P 500 fund tracking the S&P 500 Index, while OEF is a Large Cap Blend Equities fund tracking the S&P 100 Index. Both are passively managed. Over the past 10 years, VOO returned 15.72%/yr vs 16.78%/yr for OEF. With a 0.98 correlation, they move nearly in lockstep. VOO charges 0.03%/yr vs 0.20%/yr for OEF.
Performance
VOO vs. OEF - Performance Comparison
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Returns By Period
In the year-to-date period, VOO achieves a 10.99% return, which is significantly higher than OEF's 8.71% return. Over the past 10 years, VOO has underperformed OEF with an annualized return of 15.72%, while OEF has yielded a comparatively higher 16.78% annualized return.
VOO
- 1D
- 1.74%
- 1M
- 2.12%
- YTD
- 10.99%
- 6M
- 11.51%
- 1Y
- 27.95%
- 3Y*
- 21.25%
- 5Y*
- 13.93%
- 10Y*
- 15.72%
OEF
- 1D
- 2.03%
- 1M
- 0.66%
- YTD
- 8.71%
- 6M
- 9.60%
- 1Y
- 28.24%
- 3Y*
- 23.02%
- 5Y*
- 15.42%
- 10Y*
- 16.78%
VOO vs. OEF - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
VOO Vanguard S&P 500 ETF | 10.99% | 17.82% | 24.98% | 26.32% | -18.17% | 28.79% | 18.32% | 31.37% | -4.50% | 21.77% |
OEF iShares S&P 100 ETF | 8.71% | 19.80% | 30.74% | 32.71% | -21.03% | 29.18% | 21.21% | 31.87% | -4.16% | 21.82% |
Correlation
The correlation between VOO and OEF is 0.97 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.97 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.97 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.98 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.98 |
Correlation (All Time) Calculated using the full available price history since Sep 9, 2010 | 0.98 |
The correlation between VOO and OEF has been stable across timeframes, ranging from 0.97 to 0.98 - a consistent structural relationship.
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Return for Risk
VOO vs. OEF — Risk / Return Rank
VOO
OEF
VOO vs. OEF - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard S&P 500 ETF (VOO) and iShares S&P 100 ETF (OEF). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| VOO | OEF | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.14 | ||
| Sortino ratioReturn per unit of downside risk | +0.20 | ||
| Omega ratioGain probability vs. loss probability | 1.42 | 1.39 | +0.03 |
| Calmar ratioReturn relative to maximum drawdown | 3.15 | 2.57 | +0.59 |
| Martin ratioReturn relative to average drawdown | 14.25 | 10.52 | +3.73 |
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Drawdowns
VOO vs. OEF - Drawdown Comparison
The maximum VOO drawdown since its inception was -33.99%, smaller than the maximum OEF drawdown of -54.11%. Use the drawdown chart below to compare losses from any high point for VOO and OEF.
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Drawdown Indicators
| VOO | OEF | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -33.99% | -54.11% | +20.12% |
Max Drawdown (1Y)Largest decline over 1 year | -8.90% | -11.06% | +2.16% |
Max Drawdown (3Y)Largest decline over 3 years | -18.69% | -19.80% | +1.11% |
Max Drawdown (5Y)Largest decline over 5 years | -24.52% | -26.47% | +1.95% |
Max Drawdown (10Y)Largest decline over 10 years | -33.99% | -31.44% | -2.55% |
Current DrawdownCurrent decline from peak | -0.63% | -1.67% | +1.04% |
Average DrawdownAverage peak-to-trough decline | -3.68% | -11.74% | +8.06% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.97% | 2.69% | -0.72% |
Volatility
VOO vs. OEF - Volatility Comparison
The current volatility for Vanguard S&P 500 ETF (VOO) is 4.61%, while iShares S&P 100 ETF (OEF) has a volatility of 4.96%. This indicates that VOO experiences smaller price fluctuations and is considered to be less risky than OEF based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| VOO | OEF | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.61% | 4.96% | -0.35% |
Volatility (6M)Calculated over the trailing 6-month period | 9.72% | 10.42% | -0.70% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.34% | 13.29% | -0.95% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 16.90% | 17.79% | -0.89% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.05% | 18.49% | -0.44% |
VOO vs. OEF - Expense Ratio Comparison
VOO has a 0.03% expense ratio, which is lower than OEF's 0.20% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
VOO vs. OEF - Dividend Comparison
VOO's dividend yield for the trailing twelve months is around 1.03%, which matches OEF's 1.04% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
OEF iShares S&P 100 ETF | 1.04% | 0.81% | 1.03% | 1.19% | 1.55% | 1.06% | 1.43% | 1.87% | 2.09% | 1.81% | 2.07% | 2.11% |
VOO Vanguard S&P 500 ETF | 1.03% | 1.13% | 1.24% | 1.46% | 1.69% | 1.25% | 1.54% | 1.88% | 2.06% | 1.78% | 2.02% | 2.10% |
Frequently Asked Questions
With a correlation of 0.97, VOO and OEF move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
OEF has higher volatility (4.96%) compared to VOO (4.61%). In terms of maximum drawdown, VOO dropped -33.99% vs OEF's -54.11%.
On 10-year performance, OEF leads with 16.78% vs 15.72% for VOO. On fees, VOO is cheaper at 0.03% per year. On volatility, VOO has been the lower-risk option at 4.61%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 10-year period, OEF has performed better with a 16.78% return vs 15.72%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
VOO is cheaper with a 0.03% expense ratio, compared with 0.20% for OEF.
VOO and OEF have nearly identical dividend yields, around 1.03%.
VOO is categorized as S&P 500, while OEF is Large Cap Blend Equities. VOO tracks S&P 500 Index, while OEF tracks S&P 100 Index. They also come from different issuers: Vanguard and iShares. Their fees differ too: 0.03% for VOO and 0.20% for OEF.
VOO currently has the higher Sharpe Ratio (2.28 vs 2.14), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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