AI Infrastructure and Memory Sector Lead Valuation Gains
The market capitalization rankings for the largest corporations in Asia-Pacific underwent a significant reshuffle in the third quarter of 2026, driven primarily by gains in artificial intelligence infrastructure and memory semiconductor companies. According to GlobalData, the combined market capitalization of the region's 50 largest companies reached $13.74 trillion at the end of September, representing a 4.7% increase from June and a 49.5% rise year-over-year.
At the center of this expansion was Taiwan Semiconductor Manufacturing Co (TSMC), which retained the top spot with a market capitalization of $2.02 trillion at the end of September. This figure marked a 2.8% increase from the June quarter and an 81.6% rise year-over-year. GlobalData attributes TSMC’s sustained lead to robust demand for advanced AI processors manufactured at three-nanometer and two-nanometer nodes, as well as for Chip-on-Wafer-on-Substrate (CoWoS) advanced packaging. The company reported record second-quarter profit, with net income rising 77% year-over-year. Management described the AI demand fueling these results as a strong, multiyear structural trend.
Memory Manufacturers Capture Disproportionate Growth
The memory sector accounted for the vast majority of the quarter's aggregate growth. ChangXin Memory Technologies (CXMT), which listed in Shanghai in July, was responsible for $555 billion of the group’s $620 billion gain. Without CXMT, the market capitalization of the 50 largest APAC companies would have risen just 0.5%. Valued at $554.8 billion, CXMT entered the ranking in fourth place.
Other memory manufacturers also saw substantial valuation increases. Samsung Electronics reached a market capitalization of $1.27 trillion, up 225.6% year-over-year, while SK Hynix reached $956.3 billion, up 432.8%. GlobalData noted that SK Hynix’s record second-quarter results were driven by high-value DRAM and HBM demand, with HBM4 entering mass shipments and long-term agreements with key customers.
However, the memory cycle also brought volatility. Samsung is benefiting from the memory upcycle and expanding HBM4 sales, although its shares corrected 25% from their June peak by early October as investors questioned whether memory margins had peaked. Similarly, Japan’s Kioxia market cap rose nearly tenfold year-over-year before falling 37.6% from June, highlighting the volatility accompanying the memory cycle.
Chinese Banks and Energy Stocks Rise Amid Geopolitical Shifts
Chinese state-owned banks also saw significant gains despite broader economic headwinds. ICBC rose 19% quarter-over-quarter to $418.3 billion, while Agricultural Bank of China, China Construction Bank, and Bank of China gained 17%, 21.1%, and 19.8% respectively. FINCHANNEL reported that these gains occurred despite weak credit demand and prolonged pressure from China’s property slowdown and low interest rates, suggesting investors are differentiating large state-owned lenders from smaller institutions.
Energy stocks climbed as geopolitical tensions pushed oil prices sharply higher during the quarter. Brent crude rose about 40% in Q3 amid disruptions linked to the Middle East conflict. PetroChina climbed 29.2% from the end of June to $296.8 billion, while CNOOC rose 18.5%. Seagate also gained 320.2% to $211.3 billion, reflecting storage requirements created by AI and hyperscale data centers; its fiscal 2026 revenue increased by 34% due to robust cloud data-center demand.
Divergence Among Tech Giants and Japanese Financials
Not all major tech firms participated in the rally. Tencent fell 36% year-over-year and Alibaba fell 37.2%, while CATL declined 21.3%. In contrast, MediaTek surged 257.7% year-over-year to $247.8 billion.
Japanese financial institutions also performed strongly as higher Japanese interest rates improved the sector. MUFG was up 44.4% year-over-year, SMFG up 55.6%, and Mizuho up 65.4%. These gains contrasted with the broader market movements in other sectors, illustrating the varied drivers behind the APAC market cap reshuffle.