TSMC opened at its 10% limit-down price of NT$2,020 in Taipei on 6 November, 9.82% below its 5 November close, according to Taiwan Stock Exchange data. By about 9:30 a.m. Taiwan time it traded at NT$2,050, down 8.48%, and the TAIEX index was down 8.21% at 38,162.08.
By our arithmetic, TSMC, MediaTek, ASE Technology Holding and Hon Hai were together about NT$6.01 trillion, or about $181.9 billion, lower in market value at that read than at the 5 November close, at 33.054 Taiwan dollars to the US dollar. TSMC accounted for about $149.1 billion of it, or 82%.
Business Pill · Concentration
A short Business Engineer explainer on concentration: when a few big pieces make up most of a total. It teaches the general idea only and says nothing about TSMC or Taiwan’s market.
The key insight: By our arithmetic on Taiwan Stock Exchange data, TSMC opened at its 10% limit-down price, 9.82% below its 5 November close, and TSMC, MediaTek, ASE Technology Holding and Hon Hai were together about $181.9 billion lower in market value at about 9:30 a.m. Taiwan time on 6 November.
Taiwan Stock Exchange data read at 01:31 UTC show MediaTek at NT$3,115 and ASE Technology Holding at NT$515, both 9.97% lower and both at their limit-down prices, with the open, high, low and latest trade at the same price. Hon Hai traded at NT$215.50, down 8.30%, after a low of NT$212.50, 9.57% below its previous close.
The TAIEX opened 6.40% lower at 38,915.76 and touched a low of 37,837.05, 8.99% below its 5 November close of 41,574.72, by our arithmetic. The zerohedge account on X posted at 01:13 UTC that TSMC shares tumbled 9.8%, pushing the TAIEX 9% lower. Those figures match TSMC’s limit-down open and the index’s low; by about 9:30 a.m. both falls were smaller.
Market value lost against the 5 November close on the morning of 6 November 2026: TSMC, MediaTek, Hon Hai and ASE Technology Holding at about 9:30 a.m. Taiwan time (Taiwan Stock Exchange data), Samsung Electronics and SK hynix at the 9:03 a.m. KOSPI halt (Korea Exchange via Naver), and SoftBank Group, Advantest, Tokyo Electron and Kioxia at 9:39 a.m. Japan time (Tokyo Stock Exchange via Kabutan). Our arithmetic: price change times issued shares, converted at different times and exchange rates. Intraday figures, not closes.
By our arithmetic across the three pieces, Samsung Electronics and SK hynix were about $166 billion lower at the Seoul halt, four Tokyo-listed names about $54.3 billion lower at 9:39 a.m. Japan time, and the four Taiwan names about $181.9 billion lower at about 9:30 a.m. Taiwan time. That is about $402 billion across ten companies, a rough sum measured at different times and exchange rates rather than a single snapshot.
Taiwan’s Ministry of Economic Affairs said on 5 November that ASE Semiconductor plans to invest NT$123.7 billion and hire 3,553 more local staff, adding production lines at Nanzih, Kaohsiung and Tainan parks to expand high-end packaging and testing capacity. In our translation, the ministry said the investment responds to “demand for high-end semiconductor packaging and testing driven by the rapid development of AI and high-performance computing”. At 33.054 Taiwan dollars to the dollar, NT$123.7 billion is about $3.74 billion, by our arithmetic.
Micron’s Taoyuan Plant
Separately, Bloomberg and Taiwan’s United Daily News reported on 5 November that Micron had paused construction of its $4.5 billion plant in Taoyuan amid a labour dispute, as we covered in Taiwan Calls Micron’s Union Deal Valid as $4.5B Fab Stalls. The Taoyuan union called the pause report unofficial, and Taoyuan’s labour bureau says the union and the company meet for a third time on 6 November. We found no statement from Micron on the plant.
The Business Lever
The business lever is concentration: TSMC alone accounted for about 82% of the value lost by the four Taiwan names at our read, by our arithmetic, and MediaTek and ASE Technology Holding were held at the 10% limit. The day before, on 5 November, the government’s approval of ASE Semiconductor’s packaging investment showed spending on AI capacity continuing on the island.
As we read the open, Taipei followed Seoul and Tokyo: three markets opened sharply lower within the same hour of trading, after the 5 November sell-off in New York.
As we read the exchange data, the sell-off in Taiwan hit the limit: MediaTek and ASE Technology Holding were held at their 10% limit-down prices at our read, and TSMC opened at its limit before trading back to an 8.48% fall.
As we read the ministry’s release alongside the prices, the government approved new AI packaging capacity on the island on 5 November, the day before the open.
Taiwan Ministry of Economic Affairs, 5 November 2026 (our translation)
“demand for high-end semiconductor packaging and testing driven by the rapid development of AI and high-performance computing”
Three Implications
FOR TSMC At about 9:30 a.m. it was about $149.1 billion lower in market value than at the 5 November close, by our arithmetic, about 82% of the four Taiwan names’ total.
FOR THE REGION With Seoul and Tokyo, about $402 billion across ten companies, by our arithmetic, measured at different times and exchange rates.
FOR ASE SEMICONDUCTOR Its NT$123.7 billion plan, about $3.74 billion by our arithmetic, adds 3,553 local staff, according to the ministry.
The analysis says: “It is a sovereign-scale financing problem dressed in tech-company clothing — and the financial architecture is starting to invert.”
As we read it, Taiwan’s chipmakers sit at the receiving end of that financing: on 6 November, TSMC alone accounted for about $149.1 billion of lost market value at our 9:30 a.m. read, by our arithmetic. The analysis predates this sell-off and does not discuss Taiwanese share prices.
What Is Not Established
The prices in this piece are intraday readings from the Taiwan Stock Exchange’s market information system at about 9:30 a.m. Taiwan time, not a close, and they may change through the session. Market values use issued common shares from Taiwan Stock Exchange open data and Yahoo Finance’s exchange rate at 01:30 UTC. The three-market total combines readings at different times and exchange rates. We read the Bloomberg, United Daily News and Central News Agency reports by headline only, and we did not contact the companies.
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This week’s issue: for two years the AI build-out was priced as a growthstory. This week it started being priced as a credit story.
TSMC opened at its 10% limit-down price on 6 November and was 8.48% lower at about 9:30 a.m. Taiwan time, with MediaTek and ASE Technology Holding held at the limit. By our arithmetic, the four Taiwan names were about $181.9 billion lower in value, the largest single share of an Asian chip sell-off that touched about $402 billion across three markets.
A note on sourcing. Prices, index levels and limit-down prices are Taiwan Stock Exchange market information system data read between 01:29 and 01:31 UTC on 6 November 2026, about 9:30 a.m. Taiwan time; issued common shares are Taiwan Stock Exchange open data; the exchange rate is Yahoo Finance’s quote at 01:30 UTC. The ASE investment is from Taiwan’s Ministry of Economic Affairs release of 5 November, quoted in our translation.
Korea and Japan figures are from our earlier pieces. Market values and changes are our arithmetic. Bloomberg, United Daily News and Central News Agency reports were read by headline only. We did not contact the companies.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
