Samsung Electronics has recorded the steepest year-on-year market capitalisation growth among the world’s largest publicly traded companies, with its valuation climbing 453.12 percent to approximately $1.5 trillion as of 17 June 2026, according to a new report from BestBrokers.
The South Korean technology giant’s surge, up from $271.40 billion a year earlier, outpaced every other mega-cap firm globally and reflects what analysts describe as a broad re-rating of semiconductor and AI-linked equities. The jump comes as Samsung reportedly prepares a 1,000 trillion won ($648 billion) investment in chips, AI infrastructure, and next-generation technologies, intensifying competition among the world’s most valuable companies.
The BestBrokers report examined 97 mega-cap companies, defined as those with market capitalisations of $200 billion or more, classifying them by country, sector, and industry while tracking three-year and one-year shifts in valuation. The findings point to accelerating demand for advanced memory chips and high-bandwidth components used in artificial intelligence infrastructure as the primary driver behind Samsung’s growth.
Dutch semiconductor equipment manufacturer ASML Holding posted the second-largest gain, with its market capitalisation rising 136.85 percent to more than $695 billion, up from roughly $293.54 billion. As the world’s leading supplier of extreme ultraviolet lithography systems essential for advanced chip production, ASML has benefited from sustained AI-driven capital expenditure across the semiconductor supply chain, particularly from major clients such as TSMC and Samsung as both expand leading-edge chip production capacity. The gain placed ASML 20th globally by market capitalisation.
Alphabet, Google’s parent company, recorded the third-highest growth among mega-caps, with its valuation increasing 119.99 percent to approximately $4.53 trillion, up from around $2.06 trillion. The increase cements Alphabet’s position as the world’s second most valuable company, trailing only Nvidia, and reflects strong investor confidence in the company’s cloud computing operations, advertising resilience, and integration of generative AI across its core products.
Taiwanese chipmaker TSMC and US networking equipment maker Cisco rounded out the top five fastest-growing mega-caps, with valuations rising 118.55 percent and 86.39 percent respectively. TSMC’s growth lifted it to become the world’s seventh most valuable company, fuelled by surging demand for its advanced AI chips from customers including Nvidia, Apple, and AMD. Cisco, ranked 27th globally, benefited from growing enterprise spending on AI-ready networking infrastructure and data centre upgrades.
Other notable gainers included China Construction Bank, Morgan Stanley, HSBC, Broadcom, and Johnson & Johnson, each posting year-on-year increases of more than 50 percent.
Not every mega-cap shared in the rally. Netflix recorded the steepest decline in the cohort, with its market capitalisation falling 36.10 percent from $518.76 billion to $331.47 billion. The drop was driven largely by the collapse of its $82.7 billion bid for Warner Bros. Discovery, which had weighed on the stock for months, alongside the departure of co-founder Reed Hastings as board chairman, which rattled investor confidence at an already fragile moment for the company.
French luxury group Hermès International also saw its valuation decline, falling 26.18 percent to $211.76 billion amid a broader cooling in luxury demand following several years of exceptional post-pandemic growth. US payments company Mastercard slipped 16.07 percent to $442.97 billion, as investors reassessed valuation levels in mature financial infrastructure stocks and rotated toward higher-growth segments of the market.
The report underscores technology’s continued dominance of the global mega-cap landscape. The sector now comprises 39 companies with a combined valuation of $38.6 trillion, accounting for roughly 60 percent of total mega-cap value despite representing less than half of the firms tracked. At the top of that hierarchy, four US companies, Nvidia, Alphabet, Microsoft, and Apple, together command $16.87 trillion, or about a quarter of the entire mega-cap universe.
Alan Goldberg, lead data analyst at BestBrokers, said the findings point to a deeper shift beneath the headline figures. “Capital is beginning to cluster around the physical backbone of artificial intelligence rather than its consumer-facing sheen,” he said, adding that growth is increasingly defined by proximity to bottlenecks such as chip fabrication, networking capacity, and the broader industrial machinery of computation. He noted that the divergence between rapidly accelerating and cooling companies suggests markets are no longer rewarding digital expansion uniformly, but are instead distinguishing between the enablers and the end products of the AI economy.
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