OEF Vs. XOEF: Why I'm Favoring The S&P 100 Heading Into 2027

This article compares the iShares S&P 100 ETF and the iShares S&P 500 ex S&P 100 ETF, two ETFs that track the S&P 100 and the S&P 500 ex-100 Indexes, respectively. Historically, it should come as no surprise that the S&P 100 Index has outperformed. However, XOEF has flipped the script in 2026 and is beating OEF by 7.85 percentage points. I analyzed growth and valuation changes throughout the year and found that most can be attributed to P/E changes. The question is if OEF's 7.63% current P/E premium is appropriate.