1. Introduction: Framing the U.S. Equity Market Through Three Leading ETFs This report provides a comprehensive comparative analysis of three of the most significant Exchange Traded Funds (ETFs) in the U.S. market: the Invesco QQQ Trust (QQQ), the SPDR S&P 500 ETF Trust (SPY), and the SPDR Dow Jones Industrial Average ETF Trust (DIA). These funds serve as essential proxies for distinct and vital segments of the U.S. stock market —technology and growth, the broad market, and established blue-chip industrials , respectively. The objective of this analysis is to dissect their performance, risk profile, and structural characteristics over the past decade (c. 2015-2025) to inform strategic investment decisions. This analysis will not only review their past performance but also evaluate the underlying economic regimes in which each ETF is most likely to thrive, recognizing that market leadership is often cyclical. The table below offers a high-level overview of each ETF, its underlying ...