AI concept stocks welcome heavy positive news! Marvell Technology, Inc. (MRVL.US) and Lantronix, Inc. (FLEX.US) have been included in the S&P 500 index, with their stock prices rising after hours.

Standard & Poor's Dow Jones Indices announced the latest quarter index adjustments on Friday, with artificial intelligence (AI) infrastructure concept stocks Marvell Technology, Inc. (MRVL.US) and electronic manufacturing services giant Lantronix, Inc. (FLEX.US) officially included in the S&P 500 index, replacing pool equipment manufacturer Pool Corp. (POOL.US) and food company Campbell Soup Co. (CPB.US). According to the announcement, the adjustments will take effect before the opening on June 22nd. After the news was announced, Marvell Technology, Inc. saw its stock price rise by about 6% in after-hours trading, while Lantronix, Inc. rose over 2%. The inclusion of these two companies in the S&P 500 index is seen as an important milestone by the market for benefiting from the AI industry boom in recent years. Marvell Technology, Inc. had previously announced its latest financial report, showing quarterly performance guidance higher than market expectations and raising its full-year performance outlook. The management stated that the strong demand for high-speed network chips and custom computing chips in AI data centers is driving the company's business growth. As an important participant in the AI infrastructure industry chain, Marvell Technology, Inc. is benefiting from the increasing demand for computing power brought by the continuous expansion of AI data centers by large global tech companies. Meanwhile, Lantronix, Inc. has recently delivered impressive results. The company's profit guidance for the fiscal year 2027 released earlier exceeded Wall Street's general expectations, and it announced plans to spin off its cloud computing and power infrastructure business units to further unlock shareholder value. With the continuous growth in demand for AI servers, power equipment, and data center construction, Lantronix, Inc. is gradually transforming from a traditional electronic manufacturing services enterprise into an important participant in the AI infrastructure supply chain. Analysts point out that being included in the S&P 500 index is of great significance for listed companies. According to the updated rules in April of this year, companies that want to enter the S&P 500 index need to meet a market value threshold of at least $22.7 billion, as well as meet requirements for profitability, liquidity, and public shareholding ratio. Due to a large number of passive funds and ETF products tracking the S&P 500 index, new index companies usually receive passive capital inflows from index funds, while companies that are excluded may face corresponding selling pressure. With the continuous expansion of passive investment scale, being included in the S&P 500 index has become one of the important value catalysts for US listed companies. In fact, just this Thursday, Standard & Poor's Dow Jones Indices announced that it would maintain the existing index inclusion standards and not create a "fast track" for large tech IPO companies. According to current rules, new companies still need to meet at least a 12-month observation period requirement, as well as profitability and public float requirements, to qualify for inclusion. This decision means that upcoming IPO companies like SpaceX, OpenAI, and Anthropic will not be able to enter the S&P 500 index in the short term. Industry research estimates that if rapid inclusion in the index is allowed, SpaceX could potentially receive about $14 billion in passive capital buying, while OpenAI and Anthropic could attract potential passive capital inflows of around $8 billion and $4.6 billion, respectively. Analysts believe that Standard & Poor's Dow Jones indices' insistence on current rules reflects their emphasis on the stability and investability of index constituents, rather than simply making inclusion adjustments based on company size. It is worth mentioning that in the quarterly adjustments in March of this year, Vertiv Holdings (VRT.US), Lumentum Holdings (LITE.US), Coherent (COHR.US), and EchoStar Corporation Class A (SATS.US) were also included in the S&P 500 index, replacing Match Group (MTCH.US), Molina Healthcare (MOH.US), Lamb Weston (LW.US), and Paycom Software (PAYC.US).