OEFvsMGCETF Comparison
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iShares S&P 100 ETF (OEF) and Vanguard Mega Cap ETF (MGC) belong to the same industry segment: US Large Cap. Both ETFs have the same top 3 sector exposures: Technology, Finance and Consumer Non-Cyclicals. OEF is more expensive with a Total Expense Ratio (TER) of 0.2%, versus 0.05% for MGC. OEF is up 6.43% year-to-date (YTD) with -$10.07B in YTD flows. MGC performs better with 7.91% YTD performance, and -$626M in YTD flows. Run a side-by-side ETF comparison of OEF and MGC 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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OEF vs MGC performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 07/27/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | OEF MGC | +0.04%-0.58% | +3.00%+3.24% | +6.43%+7.91% | +16.46%+17.45% | +77.40%+74.72% | +90.22%+83.59% |
| Flows | OEF MGC | -$166M-$184K | -$402M+$234M | -$10.07B-$626M | -$4.49B+$996M | +$2.58B+$2.18B | +$2.80B+$2.23B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | OEF MGC | +14.24%+13.80% | +13.75%+13.33% | +16.15%+15.55% | +17.90%+17.52% |
| Max drawdown | OEF MGC | -5.41%-4.88% | -10.96%-9.86% | -19.77%-19.36% | -26.44%-25.79% |
| Max drawdown duration | OEF MGC | 56d55d | 169d92d | 126d126d | 696d707d |
Trading data
OEF | MGC | |
Last sale 7/28/2026 at 5:54 PM | $364.45 | $270.28 |
| Previous close 07/27/2026 | $363.22 | $269.44 |
| Consolidated volume 07/27/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of June 30, 2026
1-year trailing difference
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OEF | MGC | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 7/28/2026 at 5:54 PM
Live
Closed
OEF | MGC | |
|---|---|---|
| Last price | $364.45 | $270.28 |
| 1D performance | +0.34% | +0.31% |
| AuM | $19.72 B | $9.87 B |
| E/R | 0.2% | 0.05% |
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Exposure
Countries
OEF
USA
98.96%
Other
1.04%
MGC
USA
97.4%
Other
2.6%
Sectors
OEF
Technology
53.77%
Finance
11.08%
Consumer Non-Cycl.
10.3%
Healthcare
8.67%
Other
16.18%
MGC
Technology
51.72%
Finance
11.63%
Consumer Non-Cycl.
9.32%
Healthcare
8.9%
Other
18.42%
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Diversification
OEF
Total weight of top 15 holdings out of 15
60.12%
MGC
Total weight of top 15 holdings out of 15
51.79%
Top 15 holdings
Data as of June 30, 2026
OEF
NVIDIA Corp.
10.47%
Apple, Inc.
9.18%
Microsoft Corp.
5.99%
Amazon.com, Inc.
5.04%
Alphabet, Inc.
4.53%
Broadcom Inc.
3.86%
Alphabet, Inc.
3.61%
Micron Technology, Inc.
2.81%
Meta Platforms, Inc.
2.67%
Tesla, Inc.
2.56%
Eli Lilly & Co.
2.05%
Advanced Micro Devices, Inc.
2.05%
Berkshire Hathaway, Inc.
1.98%
JPMorgan Chase & Co.
1.90%
Intel Corp.
1.43%
MGC
NVIDIA Corp.
8.68%
Apple, Inc.
8.02%
Microsoft Corp.
5.23%
Amazon.com, Inc.
4.35%
Alphabet, Inc.
3.96%
Broadcom Inc.
3.38%
Alphabet, Inc.
3.11%
Micron Technology, Inc.
2.46%
Meta Platforms, Inc.
2.33%
Tesla, Inc.
2.24%
Eli Lilly & Co.
1.92%
Advanced Micro Devices, Inc.
1.79%
Berkshire Hathaway, Inc.
1.64%
JPMorgan Chase & Co.
1.54%
Johnson & Johnson
1.15%
Frequently asked questions about OEF and MGC
How have the OEF and MGC ETFs performed in 2026?
As of July 27, 2026, OEF is up 6.43% year-to-date (YTD), while MGC has returned 7.91%. That puts MGC better performer ahead so far this year.
Which ETF is attracting more investor money: OEF or MGC?
Year-to-date, the OEF ETF saw -$10.07B in flows, compared to -$626M for MGC.
Which ETF is more volatile: OEF or MGC?
Over the past year, OEF had a volatility of 13.75%, while MGC experienced 13.33%.
Which ETF is bigger: OEF or MGC?
As of July 27, 2026, OEF holds $19.72 B in assets under management (AUM), while MGC manages $9.87 B.
What sectors do the OEF and MGC ETFs invest in?
OEF leans toward sectors like Technology, Finance and Consumer Non-Cyclicals. Meanwhile, MGC focuses on Technology, Finance and Consumer Non-Cyclicals.
What are the top holdings of the OEF ETF and MGC ETF?
OEF top holdings include NVIDIA Corp., Apple, Inc. and Microsoft Corp.. MGC holds in its top three: NVIDIA Corp., Apple, Inc. and Microsoft Corp..
Which ETF is more diversified: OEF or MGC?
OEF holds 103 securities with 60.12% of its assets in the top 15. MGC has 174 securities and a top 15 weight of 51.79%.
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