According to CoinMeta, TSMC ( TSMC ) experienced a significant decline in its stock price in October 2026, despite its quarterly financial report showing record-breaking earnings and upward-revised revenue forecasts. TSMC's stock price fell from $485.80 at the beginning of October to $406.13 on the 30th, representing a cumulative decrease of about 16% for the month. Although the report indicated that third-quarter revenue reached $46.72 billion, a year-on-year increase of 41.2%, and net profit grew by 68.7% to NT$763.06 billion, concerns regarding spending on artificial intelligence and semiconductor valuations put pressure on the stock price. After a strong start in October, TSMC's stock price dropped to $430 on the 14th and further fell to $412.61 on the 16th. Although it briefly rebounded to $439.51 on the 28th, it declined by another 5.95% on the 30th. TSMC expects its fourth-quarter revenue to be between $52.3 billion and $54.3 billion.