- Robinhood Markets (HOOD) stock surged nearly 16% to a record high of $117.28 following its announced inclusion in the S&P 500 (SPX) on September 22, alongside AppLovin (APP) and Emcor Group (EME), replacing MarketAxess Holdings (MKTX), Caesars Entertainment (CZR), and Enphase Energy (ENPH).
- AppLovin (APP) shares rose 11.59% to $547.04, reflecting its market cap growth from $13.5 billion in late 2023 to over $100 billion by December 2024 and $4.7 billion in 2024 revenue from app analytics and monetization tools.
- Emcor Group (EME) closed slightly down at $621.58 but gained after hours to $627.00, bolstered by its $14.57 billion 2024 revenue from energy infrastructure services, including support for AI data centers amid tech sector expansion.

Robinhood Markets (HOOD) surged to a record high close of $117.28, marking a gain of nearly 16% in a single trading session, as investors reacted positively to its impending inclusion in the S&P 500 (SPX) index. This development positions the brokerage firm among the largest publicly traded companies in the United States, reflecting its substantial growth trajectory. The platform, which facilitates easy access to trading and has been instrumental in democratizing investment opportunities, experienced a dramatic increase in user engagement during the early 2020s. Its user base expanded from 11.7 million to 21.3 million between December 2020 and June 2021, driven by phenomena such as the meme-stock trading surge exemplified by GameStop’s (GME) over 2,000% rise. Robinhood’s trading revenue nearly doubled from the first quarter to the second quarter of 2020, coinciding with widespread lockdowns that boosted retail participation. The company further diversified by embracing cryptocurrency trading, allowing users to engage with assets like bitcoin amid market rallies. This momentum culminated in a $2.1 billion initial public offering in July 2021, and by 2024, Robinhood reported revenue of $2.95 billion, underscoring its evolution from a niche app to a mainstream financial service provider.
Joining Robinhood in the S&P 500 rebalancing on September 22 are AppLovin (APP) and Emcor Group (EME), as announced by S&P Dow Jones Indices. These additions will displace MarketAxess Holdings (MKTX), Caesars Entertainment (CZR), and Enphase Energy (ENPH) from the index. AppLovin, a key player in the mobile app ecosystem offering analytics, advertising technology, and monetization solutions for developers, has demonstrated remarkable expansion. Its market capitalization escalated from approximately $13.5 billion at the end of 2023 to more than $100 billion by December 2024, fueled by the booming demand for app-related services in a digital-first economy. In 2024, the company achieved revenue of $4.7 billion, highlighting its role in enabling app creators to optimize performance and revenue streams in competitive markets. On the day of the announcement’s market impact, AppLovin shares advanced 11.59% to close at $547.04, capturing investor enthusiasm for its growth prospects.
Emcor Group, specializing in industrial and energy infrastructure services for utilities, power plants, and refineries, is poised to benefit from its strategic positioning in emerging sectors. The firm has established itself as a prominent provider for AI data centers, aligning with the intensifying demand from technology giants racing to enhance computational and energy capacities for artificial intelligence advancements. Emcor recorded revenue of $14.57 billion in 2024, illustrating its scale in delivering critical infrastructure solutions amid a surge in data center development. In trading, Emcor’s stock dipped less than 1% to close at $621.58 but rebounded slightly after hours with a 0.82% gain to $627.00, suggesting measured investor response to the index inclusion news.
The outgoing companies experienced varied but subdued reactions. Caesars Entertainment and MarketAxess Holdings both ended the session roughly flat following initial declines, while Enphase Energy shed more than 2% after an intraday drop of as much as 3%. Inclusion in the S&P 500 typically attracts passive investment flows from index-tracking funds, which can enhance liquidity and visibility for the new entrants. For Robinhood, AppLovin, and Emcor, this milestone validates their market presence and operational achievements, potentially setting the stage for sustained institutional interest in their respective domains of retail finance, app technology, and energy infrastructure.
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