--- title: "📈 AI Stock Chat, 2026-10-21: Heavy bearish pressure on the market, individual stocks technically overbought, avoid chasing highs" description: "Hello everyone, I'm Muyan! Welcome to today's \"AI Stock Chat.\" Today is Wednesday, October 21, 2026. Although the Taiwan stock market only fell slightly by 0.61% today, the number of declining stocks actually reached as high as 859, leaving the entire board in a sea of green with extremely high capital concentration. Today, we are going to predict the trends of the Taiex and key stocks for the next trading day, Thursday, October 22. The AI models seem to have a conservative outlook for both tomorrow and next week. How should we interpret this? Let's dive right in!" canonical_url: "https://blog.markkulab.net/en/ai-stock-chat/ai-stock-chat-2026-10-21" author: "Mark Ku" author_url: "https://blog.markkulab.net/en/author/mark-ku" site: "Mark Ku's Tech Notes" date_published: "2026-10-21T02:00:00.000Z" category: "AI Stock Market Chit-Chat" tags: ["ai-stock", "podcast", "台股預測", "台股", "AI預測", "和泰車", "聯詠", "萬海", "台灣大", "00713"] language: "en" license: "CC BY 4.0" license_url: "https://creativecommons.org/licenses/by/4.0/" attribution: "when reusing or quoting, credit the author and link back to the original" --- # 📈 AI Stock Chat, 2026-10-21: Heavy bearish pressure on the market, individual stocks technically overbought, avoid chasing highs ## Introduction Hi everyone, I'm Mu-Yen! Welcome to today's episode of "AI Stock Chat". Today is Wednesday, October 21, 2026. Although the TAIEX only dipped slightly by 0.61% today, a whopping 859 stocks declined, leaving the entire board in the red with capital highly concentrated. Today, we're going to predict the market trends and key stock movements for the next trading day, Thursday, October 22. The AI model seems to have a conservative outlook for both tomorrow and next week. How should we interpret this? Let's dive right in! ## Today's Market Forecast

TAIEX AI Forecast Interval (Next-Day / Short-Term)

Before we look at the forecast, I would like to remind everyone that our service only predicts the TAIEX (Taiwan Capitalization Weighted Stock Index), providing perspectives across two dimensions: "Next-Day" and "Short-Term". The latest forecast data for tomorrow, Thursday, October 22, is as follows: | Horizon | Current Price | Forecast Direction | Target Interval | Confidence | | --- | --- | --- | --- | --- | | Next-Day (10-22) | 46822.08 | Bearish | 46158.44~46689.35 | 70.0% | | Short-Term (1 Week) | 46822.08 | Bearish | 45338.13~46525.29 | 70.0% | According to the AI model's forecast, whether for tomorrow's (October 22) next-day trading or short-term positioning over the coming week, the predicted direction is "Bearish" with a confidence level of 70.0%. Tomorrow's expected target interval lies between 46,158 and 46,689. This aligns closely with the current market sentiment. Looking back at today, October 21, only 164 stocks advanced while a staggering 859 declined, with sentiment indicators clearly leaning bearish. Although the index didn't plummet, most individual stocks are already under pressure and market breadth is extremely poor. Everyone should exercise extra caution in their trading to guard against further downward market corrections. ## Global Market Status Next, let's look at the latest status of global markets. Please note that the US stock market and TAIEX futures night session data are for "current status display" only and **contain absolutely no predictive elements**! | Index | Close | Change % | | --- | --- | --- | | TAIEX Futures Night Session (TXF) | 46691 | -0.17% | | Dow Jones Industrial Average (DJI) | 51966.03 | -0.07% | | S&P 500 Index (GSPC) | 7690.73 | 0.41% | | Nasdaq Composite (IXIC) | 26430.89 | 1.11% | | Philadelphia Semiconductor Index (SOX) | 11316.34 | 1.61% | Although US tech stocks and semiconductors performed brilliantly, with the Philadelphia Semiconductor Index surging 1.61%, the TAIEX futures night session dipped slightly by 0.17%. This indicates that the Taiwan stock market is currently somewhat decoupled from US markets. Local selling pressure and a wait-and-see attitude remain strong, meaning tomorrow's opening may still face volatile pressure. ## Strategy Stock Radar The following are the results of our strategy screening. They are **not individual stock buy/sell predictions**, so please do not use them as a copy-trading guide! | Stock | Overall Score | Institutional Flow Score | P/E Ratio | Valuation | | --- | --- | --- | --- | --- | | Hotai Motor (2207) | 77 | 100 | 13.28 | cheap | | Novatek (3034) | 75 | 100 | 20.41 | expensive | | Wan Hai (2615) | 71 | 100 | - | - | | Taiwan Mobile (3045) | 70 | 100 | 24.67 | fair | | Yuanta Taiwan High Dividend Low Volatility ETF (00713) | 69 | 100 | - | - | Let's take a look at what lies behind these five screened stocks: * **Hotai Motor (2207)**: Overall score of 77, with a perfect score for institutional flow, and its valuation is considered cheap. Although the CCI indicator shows signs of strengthening momentum, today's overall score is -0.2, placing it in the wait-and-see zone. Additionally, the Williams %R (-4.55) indicates that it has entered severely overbought territory in the short term, so do not blindly chase highs. * **Novatek (3034)**: Overall score of 75, also with a perfect institutional flow score, and trading volume expanded by 1.53 times. Although momentum is strengthening, its valuation is already expensive. Furthermore, a bearish KD death cross has appeared at high levels on the technical front, and the Williams %R also indicates overbought conditions. Investors should be particularly cautious of signals pointing to weakness at these highs. * **Wan Hai (2615)**: Overall score of 71, with a perfect institutional flow score. Today's overall score is 1.0, and momentum is strengthening (CCI 120.92), making it one of the relatively bullish momentum plays on the list. * **Taiwan Mobile (3045)**: Overall score of 70, with a perfect institutional flow score and a fair valuation. However, today's overall score is -1.7, and with the RSI as high as 72 and an elevated Williams %R, there is a technical risk of overheating and overbuying if chasing highs. * **Yuanta Taiwan High Dividend Low Volatility ETF (00713)**: Overall score of 69. Today's trading volume expanded by 1.85 times. Although momentum is strong, today's overall score is -1.9, approaching the wait-and-see zone that leans toward selling. Most notably, a bearish "shooting star" candlestick pattern has appeared on the technical chart, and the RSI has reached a severely overbought level of 77, making short-term overheating signals highly prominent. ## Recent Forecast Accuracy Review

Recent Directional Accuracy (higher is more accurate; includes settled sample size)

Finally, it's time for my favorite segment, "Honest Performance Review". No matter how good or bad the forecasts are, we report them exactly as they are! Regarding the TAIEX market forecasts: * **Next-Day Forecast**: Directional accuracy is **58.3%** (7 correct predictions out of 12); the target interval was fully hit 4 times; the average error rate is 0.86%. * **Short-Term Forecast**: Directional accuracy is **50.0%** (4 correct predictions out of 8); the target interval was fully hit 1 time; the average error rate is 2.92%. Short-term forecasting is indeed more challenging, with the accuracy rate sitting at exactly fifty-fifty. This proves once again that AI quantitative forecasting is merely a decision-support tool, not a guaranteed money-making tip. Everyone must manage their capital risk properly! ## Disclaimer This content is automatically generated by an AI model based on quantitative data and is for research reference only. It does not constitute any investment advice or recommendation. This website and the program producers are not licensed securities investment consulting enterprises, do not provide analytical opinions to specific individuals, and do not receive any compensation for this content. Investing involves risk; please exercise independent judgment and bear your own risks. --- ## About this article and its author Originally published on [Mark Ku's Tech Notes](https://blog.markkulab.net/en/ai-stock-chat/ai-stock-chat-2026-10-21) License: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) — when reusing or quoting, credit the author and link back to the original ### About the author **[Mark Ku](https://blog.markkulab.net/en/author/mark-ku)** — Software engineer - 10+ years as a software engineer - Built North-American e-commerce and AI SaaS subscription billing ### Free tools built by the author All of these are free to use: - [Free PDF Sign Tool](https://blog.markkulab.net/en/tools/pdf-sign): Online PDF sign tool — draw, type, or upload a signature, then drag, resize, and download. 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