IOOvsOEFETF Comparison
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iShares Global 100 ETF (IOO) belongs to the Global Large Cap segment. iShares S&P 100 ETF (OEF) is part of the US Large Cap segment. IOO's top 3 sector exposures are Technology, Consumer Non-Cyclicals and Finance. In contrast, OEF's top sector exposures are Technology, Finance and Consumer Non-Cyclicals. IOO is more expensive with a Total Expense Ratio (TER) of 0.4%, versus 0.2% for OEF. IOO is up 14.67% year-to-date (YTD) with +$147M in YTD flows. OEF performs worse with 12.38% YTD performance, and -$10.28B in YTD flows. Run a side-by-side ETF comparison of IOO and OEF 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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IOO vs OEF performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/27/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | IOO OEF | -0.14%-0.07% | +5.18%+5.60% | +14.67%+12.38% | +16.87%+12.11% | +110.45%+103.52% | +106.73%+93.57% |
| Flows | IOO OEF | +$94M+$57M | +$160M-$234M | +$147M-$10.28B | +$361M-$10.06B | +$787M-$88M | +$1.45B+$2.23B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | IOO OEF | +11.84%+12.05% | +14.36%+13.75% | +16.06%+16.04% | +17.21%+17.92% |
| Max drawdown | IOO OEF | -2.95%-3.16% | -9.86%-10.96% | -19.16%-19.77% | -23.35%-26.44% |
| Max drawdown duration | IOO OEF | 57d20d | 76d169d | 107d126d | 554d696d |
Trading data
IOO | OEF | |
Last sale 10/28/2026 at 1:30 PM | $144.99 | $384.24 |
| Previous close 10/27/2026 | $144.58 | $382.62 |
| 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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IOO | OEF | |
|---|---|---|
| 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 1:30 PM
Live
Closed
IOO | OEF | |
|---|---|---|
| Last price | $144.99 | $384.24 |
| 1D performance | +0.28% | +0.42% |
| AuM | $9.28 B | $20.55 B |
| E/R | 0.4% | 0.2% |
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Exposure
Countries
IOO
USA
78.67%
Other
21.33%
OEF
USA
98.97%
Other
1.03%
Sectors
IOO
Technology
55.87%
Consumer Non-Cycl.
11.65%
Finance
10.19%
Healthcare
9%
Other
13.29%
OEF
Technology
53.61%
Finance
11.34%
Consumer Non-Cycl.
10.35%
Healthcare
8.84%
Other
15.86%
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Diversification
IOO
Total weight of top 15 holdings out of 15
65.67%
OEF
Total weight of top 15 holdings out of 15
60.88%
Top 15 holdings
Data as of August 31, 2026
IOO
NVIDIA Corp.
12.85%
Apple, Inc.
11.18%
Microsoft Corp.
9.05%
Amazon.com, Inc.
6.11%
Alphabet, Inc.
4.78%
Broadcom Inc.
4.21%
Alphabet, Inc.
3.81%
JPMorgan Chase & Co.
2.28%
Samsung Electronics Co., Ltd.
2.24%
Eli Lilly & Co.
2.20%
ExxonMobil Holdings Corp.
1.60%
ASML Holding NV
1.57%
Johnson & Johnson
1.54%
Mastercard, Inc.
1.14%
Walmart, Inc.
1.10%
OEF
NVIDIA Corp.
11.13%
Apple, Inc.
9.69%
Microsoft Corp.
7.85%
Amazon.com, Inc.
5.29%
Alphabet, Inc.
4.14%
Broadcom Inc.
3.65%
Alphabet, Inc.
3.30%
Meta Platforms, Inc.
2.62%
Micron Technology, Inc.
2.25%
Tesla, Inc.
2.16%
JPMorgan Chase & Co.
1.99%
Berkshire Hathaway, Inc.
1.92%
Eli Lilly & Co.
1.91%
Advanced Micro Devices, Inc.
1.60%
ExxonMobil Holdings Corp.
1.39%
Frequently asked questions about IOO and OEF
How have the IOO and OEF ETFs performed in 2026?
As of October 27, 2026, IOO is up 14.67% year-to-date (YTD), while OEF has returned 12.38%. That puts IOO better performer ahead so far this year.
Which ETF is attracting more investor money: IOO or OEF?
Year-to-date, the IOO ETF saw +$147M in flows, compared to -$10.28B for OEF.
Which ETF is more volatile: IOO or OEF?
Over the past year, IOO had a volatility of 14.36%, while OEF experienced 13.75%.
Which ETF is bigger: IOO or OEF?
As of October 27, 2026, IOO holds $9.28 B in assets under management (AUM), while OEF manages $20.55 B.
What sectors do the IOO and OEF ETFs invest in?
IOO leans toward sectors like Technology, Consumer Non-Cyclicals and Finance. Meanwhile, OEF focuses on Technology, Finance and Consumer Non-Cyclicals.
What are the top holdings of the IOO ETF and OEF ETF?
IOO top holdings include NVIDIA Corp., Apple, Inc. and Microsoft Corp.. OEF holds in its top three: NVIDIA Corp., Apple, Inc. and Microsoft Corp..
Which ETF is more diversified: IOO or OEF?
IOO holds 103 securities with 65.67% of its assets in the top 15. OEF has 102 securities and a top 15 weight of 60.88%.
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