[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"nav-categories":3,"article-the-s-p-500-inclusion-effect-why-stocks-are-surging-again":70},{"data":4},[5,37,57,64],{"name":6,"slug":7,"categories":8},"Productivity","productivity",[9,13,17,21,25,29,33],{"id":10,"title":11,"slug":12},17,"Branding","branding",{"id":14,"title":15,"slug":16},19,"Marketing","marketing",{"id":18,"title":19,"slug":20},20,"Work","work",{"id":22,"title":23,"slug":24},34,"Community","community",{"id":26,"title":27,"slug":28},21,"For newbies","for-newbies",{"id":30,"title":31,"slug":32},24,"Investment","investment",{"id":34,"title":35,"slug":36},22,"Finance","finance",{"name":38,"slug":39,"categories":40},"Tech","tech",[41,45,49,53],{"id":42,"title":43,"slug":44},28,"Technology","technology",{"id":46,"title":47,"slug":48},32,"Artificial Intelligence","artificial-intelligence",{"id":50,"title":51,"slug":52},26,"Security and protection","security-and-protection",{"id":54,"title":55,"slug":56},31,"YouTube Blog","youtube-blog",{"name":58,"slug":59,"categories":60},"News","news",[61],{"id":62,"title":58,"slug":63},18,"quasanews",{"name":65,"slug":66,"categories":67},"Business","business",[68],{"id":69,"title":65,"slug":66},16,{"post":71,"published_news":97,"popular_news":161,"categories":232},{"title":72,"description":73,"meta_title":72,"meta_description":74,"meta_keywords":75,"text":76,"slug":77,"created_at":78,"publish_at":79,"formatted_created_at":80,"category_id":30,"links":81,"view_type":86,"video_url":87,"views":88,"likes":89,"lang":90,"comments_count":89,"category":91},"The S&P 500 Inclusion Effect: Why Stocks Are Surging Again","When a company is added to the S&P 500, its stock price often experiences a sharp increase—a phenomenon known as the \"S&P 500 inclusion effect.\" The reason is straightforward: index-tracking funds, managing approximately $13 trillion in assets, are obligated to buy shares of newly included companies to align with the index. Recent examples highlight this trend vividly—Block’s stock jumped 10%, and Datadog’s rose 15% following news of their inclusion.","When a company is added to the S&P 500, its stock price often experiences a sharp increase—a phenomenon known as the \"S&P 500 inclusion effect.","Recent examples highlight this trend vividly — Block’s stock jumped 10%, and Datadog’s rose 15% following news of their inclusion","\u003Cp>When a company is added to the S&P 500, its stock price often experiences a sharp increase—a phenomenon known as the "S&P 500 inclusion effect." The reason is straightforward: index-tracking funds, managing approximately $13 trillion in assets, are obligated to buy shares of newly included companies to align with the index. Recent examples highlight this trend vividly — \u003Ca href=\"https://quasa.io/media/jack-dorsey-s-block-joins-s-p-500-with-20-surge-nears-50-billion-market-cap-amid-bitcoin-payment-pilot\">Block’s stock jumped 10%\u003C/a>, and Datadog’s rose 15% following news of their inclusion.\u003C/p>\n\n\u003Cp class=\"image-align-center\">\u003Cpicture>\u003Csource srcset=\"https://cdn.quasa.io/photos/01/photo_2025-07-28_20-44-12.webp\" type=\"image/webp\">\u003Cimg alt=\"The S&P 500 Inclusion Effect: Why Stocks Are Surging Again\" height=\"349\" src=\"https://cdn.quasa.io/photos/01/photo_2025-07-28_20-44-12.jpg\" width=\"350\" />\u003C/picture>\u003C/p>\n\n\u003Cp>\u003Cpicture class=\"image-align-left\">\u003Csource srcset=\"https://cdn.quasa.io/photos/01/image-2025-07-28t204856745.webp\" type=\"image/webp\">\u003Cimg alt=\"The S&P 500 Inclusion Effect: Why Stocks Are Surging Again\" class=\"image-align-left\" height=\"203\" src=\"https://cdn.quasa.io/photos/01/image-2025-07-28t204856745.jpg\" width=\"270\" />\u003C/picture>Historically, this effect has fluctuated. In the 1990s, stocks saw an average gain of around 9% on the announcement day, reflecting strong market enthusiasm. However, this impact waned in the 2010s, with gains dropping to a modest 0.8% on average.\u003C/p>\n\n\u003Cp>Yet, recent data suggests the effect is making a robust comeback.\u003C/p>\n\n\u003Cp>According to Goldman Sachs, since 2021, newly added S&P 500 stocks have outperformed the market by an average of 4 percentage points on the announcement day, with nearly three-quarters beating the index.\u003C/p>\n\n\u003Cp>So, what’s driving this resurgence? One key factor is the source of new inclusions. Unlike past trends where many companies graduated from the S&P MidCap 400, today’s additions increasingly come from outside this midcap index. Stocks entering directly from outside have averaged relative gains of 5.3 percentage points since 2013, while those transitioning from the midcap index have seen negligible or even negative returns (-0.4 percentage points). This shift reduces predictability, making it harder for traders and funds to "front-run" the move, thus amplifying the surprise effect.\u003C/p>\n\n\u003Cp>\u003Cpicture class=\"image-align-right\">\u003Csource srcset=\"https://cdn.quasa.io/photos/01/image-2025-07-28t204953377.webp\" type=\"image/webp\">\u003Cimg alt=\"The S&P 500 Inclusion Effect: Why Stocks Are Surging Again\" class=\"image-align-right\" height=\"400\" src=\"https://cdn.quasa.io/photos/01/image-2025-07-28t204953377.jpg\" width=\"300\" />\u003C/picture>Another contributor is the nature of the companies being added. Recent entrants like Coinbase, Palantir, and Super Micro Computer are already popular with retail investors, often tied to trendy sectors like cryptocurrency and artificial intelligence. This pre-existing buzz fuels additional demand when inclusion is announced, boosting price surges beyond what might be expected from institutional buying alone.\u003C/p>\n\n\u003Cp>\u003Cstrong>Also read:\u003C/strong>\u003C/p>\n\n\u003Cul>\n\t\u003Cli>\u003Ca href=\"https://quasa.io/media/the-mighty-are-changing-their-tune-a-shift-on-bitcoin\">The Mighty Are Changing Their Tune: A Shift on Bitcoin\u003C/a>\u003C/li>\n\t\u003Cli>\u003Ca href=\"https://quasa.io/media/chatgpt-agent-masters-cloudflare-protection-screenshots-reveal-human-like-behavior\">ChatGPT Agent Masters Cloudflare Protection: Screenshots Reveal Human-Like Behavior\u003C/a>\u003C/li>\n\t\u003Cli>\u003Ca href=\"https://quasa.io/media/streaming-catastrophe-in-india-25-platforms-blocked-overnight\">Streaming Catastrophe in India: 25 Platforms Blocked Overnight\u003C/a>\u003C/li>\n\u003C/ul>\n\n\u003Cp>While the inclusion effect offers a short-term windfall, its long-term impact remains debated.\u003C/p>\n\n\u003Cp>The immediate price jump is largely driven by mechanical buying from index funds, but sustained growth depends on a company’s fundamentals.\u003C/p>\n\n\u003Cp>Still, the renewed vigor of the S&P 500 inclusion effect signals a market increasingly responsive to new, high-profile players — making it a critical factor for investors to watch.\u003C/p>\n\n\u003Cp>Author: \u003Ca href=\"https://www.linkedin.com/in/slava-vasipenok/\">Slava Vasipenok\u003C/a>\u003Cbr />\nFounder and CEO of \u003Ca href=\"https://quasa.io/team\">QUASA\u003C/a> (quasa.io) - Daily insights on Web3, AI, Crypto, and Freelance. Stay updated on finance, technology trends, and creator tools - with sources and real value.\u003C/p>\n\n\u003Cp>Innovative entrepreneur with over 20 years of experience in IT, fintech, and blockchain. Specializes in decentralized solutions for freelancing, helping to overcome the barriers of traditional finance, especially in developing regions.\u003C/p>\n\n\u003Cp>This is not financial or investment advice. 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Millions of Legacy Coins","In a move that could reshape the security of Bitcoin’s unspent transaction outputs forever, Bitcoin developers have introduced BIP-361 — officially titled “Post Quantum Migration and Legacy Signature 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