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OEF · Analysis updated Nov 10, 2026, 6:00 PM ET
Why is iShares S&P 100 ETF (OEF) stock moving?
OEF traded between $361.36 and $384.58 over the last 30 trading days. It peaked with a $384.24 close on Oct 28, then slid to a $361.49 close on Nov 5, a drop of about 5.9%. The decline came on heavy volume: 454,824 shares on Nov 5 and 478,603 on Nov 6, both well above the roughly 135,000 to 260,000 range of most sessions in the period. The fund closed at $363.37 on Nov 6 and has since recovered to $369.09 on Nov 10, up about 2.1% from the Nov 5 close. Volume has eased back to 159,527 shares on Nov 10, which suggests the selling pressure has faded. No news items or SEC filings were available for the period, so the cause of the selloff cannot be tied to a specific event. The price data alone shows a short-term rebound after a sharp pullback, with the ETF still about 4% below its late-October level.
About iShares S&P 100 ETF
The iShares S&P 100 ETF is a BlackRock fund, launched in 2000, that holds the roughly 100 largest blue-chip companies in the S&P 500. It is more concentrated than a broad S&P 500 fund: the top 10 holdings make up about half of its assets, and technology is close to half of the portfolio.
How the fund works
The fund passively tracks the S&P 100 Index and weights each company by its market value, so the biggest companies count the most. Its largest holdings are NVIDIA, Apple, Microsoft, Amazon, Alphabet and Broadcom. It charges an expense ratio of about 0.20% a year, manages roughly $20 billion and pays a small dividend every quarter (yield under 1%). Because so much is in a few tech giants, it is officially classed as a non-diversified fund, and a handful of stocks can drive most of its returns.
What usually moves OEF
- Performance of mega-cap tech stocks such as NVIDIA, Apple and Microsoft
- AI-related spending and investor sentiment
- Interest rates and Federal Reserve policy
- Overall US large-company earnings
- Broad US stock market risk appetite