Group 1 - Shares of cooling infrastructure company Vertiv (NYSE:VRT) have increased by more than 50% year to date [1]

Core Insights - The inclusion of Lumentum (LITE), Coherent (COHR), and Vertiv (VRT) in the S&P 500 signifies a shift in the AI trade from speculative to a structural component of the U.S. economy [1][15] - This event is not routine; it represents a significant moment in the AI infrastructure boom, highlighting the importance of photonics and data center power infrastructure [1][15] Company Summaries Lumentum (LITE) - Lumentum specializes in lasers, transceivers, and optical components essential for data movement in AI data centers, described as the "plumbing" for hyperscale AI [5] - The company has seen a remarkable stock performance, with shares up 814% over the past year and 51.51% year-to-date, despite a recent 25% decline [6][7] - Q2 FY2026 revenue reached $665.5 million, a 65.5% year-over-year increase, with non-GAAP operating margins expanding to 25.2% [7] Coherent (COHR) - Coherent, a peer of Lumentum, produces silicon carbide materials and optical networking products that are critical for the AI economy [8] - The stock has increased by 262.67% over the past year and 27.80% year-to-date, despite a recent 15% pullback [9] - The Datacenter and Communications segment generated $1.208 billion in revenue last quarter, up 34% year-over-year, now representing 72% of total revenue [10] Vertiv (VRT) - Vertiv provides power management systems and cooling infrastructure necessary for data centers, playing a crucial role in the AI buildout [11] - The stock has risen 195.20% over the past year and 49.27% year-to-date, with a record backlog of $15.0 billion, up 109% year-over-year [12][13] - For full year 2026, Vertiv expects net sales between $13.25 billion and $13.75 billion, indicating significant growth potential [13] Market Impact - The S&P 500 inclusion is a structural buying event, with over $7 trillion in assets benchmarked to the index, necessitating purchases of LITE, COHR, and VRT by passive funds [3][4] - This rebalancing is one of the most AI-focused in history, indicating the deep integration of AI infrastructure into the U.S. economy [15]