The report provides an analytical comparison of the S&P 500 and the Nasdaq 100, detailing their fundamentally different selection methodologies and subsequent market impacts. It explains that the S&P 500 is a curated, committee-driven benchmark that requires sustained profitability, positioning it as a proxy for the broad U.S. economy, while the Nasdaq 100 is a rules-based, non-financial index focused on high-growth companies listed exclusively on the Nasdaq. The analysis further discusses the "index effect," noting that the S&P 500’s historical "certification" premium has largely faded due to market efficiency, whereas the Nasdaq 100 inclusion creates a more durable liquidity enhancement. Finally, the text applies these frameworks to assess prime candidates for future inclusion in both indices, highlighting how corporate strategy, like a change in stock exchange listing or achieving profitability, can directly lead to index membership.