OEF vs. MGC
OEF (iShares S&P 100 ETF) and MGC (Vanguard Mega Cap ETF) are both Large Cap Blend Equities funds - OEF tracks the S&P 100 Index while MGC tracks the CRSP US Mega Cap Index. Both are passively managed. Over the past 10 years, OEF returned 16.78%/yr vs 16.48%/yr for MGC. With a 0.98 correlation, they move nearly in lockstep. OEF charges 0.20%/yr vs 0.05%/yr for MGC.
Performance
OEF vs. MGC - Performance Comparison
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Returns By Period
In the year-to-date period, OEF achieves a 8.71% return, which is significantly lower than MGC's 10.55% return. Both investments have delivered pretty close results over the past 10 years, with OEF having a 16.78% annualized return and MGC not far behind at 16.48%.
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%
MGC
- 1D
- 1.96%
- 1M
- 1.72%
- YTD
- 10.55%
- 6M
- 11.42%
- 1Y
- 28.97%
- 3Y*
- 22.57%
- 5Y*
- 14.62%
- 10Y*
- 16.48%
OEF vs. MGC - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
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% |
MGC Vanguard Mega Cap ETF | 10.55% | 19.31% | 27.16% | 29.77% | -19.95% | 27.58% | 21.57% | 31.14% | -3.45% | 22.61% |
Correlation
The correlation between OEF and MGC is 0.99 - 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 | 0.99 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.99 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.99 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.99 |
Correlation (All Time) Calculated using the full available price history since Dec 27, 2007 | 0.98 |
The correlation between OEF and MGC has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.
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Return for Risk
OEF vs. MGC — Risk / Return Rank
OEF
MGC
OEF vs. MGC - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares S&P 100 ETF (OEF) and Vanguard Mega Cap ETF (MGC). 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.
| OEF | MGC | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.11 | ||
| Sortino ratioReturn per unit of downside risk | -0.16 | ||
| Omega ratioGain probability vs. loss probability | 1.39 | 1.41 | -0.02 |
| Calmar ratioReturn relative to maximum drawdown | 2.57 | 2.96 | -0.39 |
| Martin ratioReturn relative to average drawdown | 10.52 | 12.90 | -2.38 |
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Drawdowns
OEF vs. MGC - Drawdown Comparison
The maximum OEF drawdown since its inception was -54.11%, roughly equal to the maximum MGC drawdown of -52.26%. Use the drawdown chart below to compare losses from any high point for OEF and MGC.
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Drawdown Indicators
| OEF | MGC | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -54.11% | -52.26% | -1.85% |
Max Drawdown (1Y)Largest decline over 1 year | -11.06% | -9.85% | -1.21% |
Max Drawdown (3Y)Largest decline over 3 years | -19.80% | -19.28% | -0.52% |
Max Drawdown (5Y)Largest decline over 5 years | -26.47% | -25.74% | -0.73% |
Max Drawdown (10Y)Largest decline over 10 years | -31.44% | -33.07% | +1.63% |
Current DrawdownCurrent decline from peak | -1.67% | -1.02% | -0.65% |
Average DrawdownAverage peak-to-trough decline | -11.74% | -7.18% | -4.56% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.69% | 2.25% | +0.44% |
Volatility
OEF vs. MGC - Volatility Comparison
iShares S&P 100 ETF (OEF) and Vanguard Mega Cap ETF (MGC) have volatilities of 4.96% and 4.96%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| OEF | MGC | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.96% | 4.96% | 0.00% |
Volatility (6M)Calculated over the trailing 6-month period | 10.42% | 10.21% | +0.21% |
Volatility (1Y)Calculated over the trailing 1-year period | 13.29% | 12.94% | +0.35% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.79% | 17.37% | +0.42% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.49% | 18.26% | +0.23% |
OEF vs. MGC - Expense Ratio Comparison
OEF has a 0.20% expense ratio, which is higher than MGC's 0.05% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
OEF vs. MGC - Dividend Comparison
OEF's dividend yield for the trailing twelve months is around 1.04%, more than MGC's 0.87% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MGC Vanguard Mega Cap ETF | 0.87% | 0.93% | 1.15% | 1.35% | 1.65% | 1.17% | 1.45% | 1.81% | 2.10% | 1.83% | 2.14% | 2.11% |
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% |
Frequently Asked Questions
With a correlation of 0.99, OEF and MGC 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.
MGC has higher volatility (4.96%) compared to OEF (4.96%). In terms of maximum drawdown, OEF dropped -54.11% vs MGC's -52.26%.
On 10-year performance, OEF leads with 16.78% vs 16.48% for MGC. On fees, MGC is cheaper at 0.05% per year. Their volatility is very similar. 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 16.48%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
MGC is cheaper with a 0.05% expense ratio, compared with 0.20% for OEF.
OEF has the higher dividend yield at 1.04%, compared with 0.87% for MGC.
OEF tracks S&P 100 Index, while MGC tracks CRSP US Mega Cap Index. They also come from different issuers: iShares and Vanguard. Their fees differ too: 0.20% for OEF and 0.05% for MGC.
MGC currently has the higher Sharpe Ratio (2.25 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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