XLK's 2.5% Edge Over FTEC Comes From a Cap Limit

When choosing a U.S. technology ETF, the choice often narrows to the Fidelity MSCI Information Technology Index ETF (FTEC) and The Technology Select Sector SPDR Fund (XLK). Both appear similar: cheap, passive, and mega-cap heavy. However, XLK has quietly outperformed FTEC with a year-to-date return of 22.06% versus 19.58%, a gap of roughly 2.5%.

The Reason Behind the Gap

The edge comes from a cap limit that XLK applies to its components—a detail most investors never notice. XLK caps any single stock at 25% of the fund's value, while FTEC does not. As NVIDIA, Microsoft, and Apple soared, XLK's periodic rebalancing forced it to trim these winners and buy underweighted stocks, reducing concentration risk.

Context

For instance, NVIDIA's weight in FTEC reached about 12% versus 8% in XLK after rebalancing. While NVIDIA surged, XLK benefited from broader diversification into Oracle, IBM, Applied Materials, and Lam Research, which contributed to performance.

What This Means for Investors

This performance gap highlights that structural details of ETFs can significantly impact returns even among seemingly identical funds. Investors should review rebalancing rules and weight caps when selecting index funds.