--- title: "📈 AI Stock Chat, 2026-08-18 | Massive foreign short positions weigh down, guard against volatility and pullbacks tomorrow, novices must avoid blindly chasing highs!" description: "Hi everyone, I'm Muyan! Welcome to \"AI Stock Chat.\" With the market hitting all-time highs, are you feeling nervous and unsure of what to do next? Today, we're going to break down the latest AI model predictions for Wednesday, August 19, 2026, and see how that record-breaking \"mysterious insurance policy\" held by foreign investors will affect tomorrow's trends. Keep listening to find out!" canonical_url: "https://blog.markkulab.net/en/ai-stock-chat/ai-stock-chat-2026-08-18" author: "Mark Ku" author_url: "https://blog.markkulab.net/en/author/mark-ku" site: "Mark Ku's Tech Notes" date_published: "2026-08-18 10:00:00 +0800" category: "AI Stock Market Chit-Chat" tags: ["ai-stock", "podcast", "台股預測", "台股", "AI預測", "台積電2330", "航運股", "萬海2615", "長榮2603"] 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, 2026-08-18 | Massive foreign short positions weigh down, guard against volatility and pullbacks tomorrow, novices must avoid blindly chasing highs! ## Intro Hi everyone, I'm Mu-Yen! Welcome to "AI Stock Chat." Now that the market has hit an all-time high, are you feeling a bit nervous and unsure of what to do next? Today, we're going to break down the AI model's latest predictions for Wednesday, August 19, 2026. How will that record-breaking "mysterious insurance policy" held by foreign institutional investors affect tomorrow's trend? Let's dive right in! ## Today's Market Forecast

TAIEX AI Prediction Range (Next-Day / Short-Term)

Our service only forecasts the Taiwan Capitalization Weighted Stock Index (TAIEX), providing two perspectives: "Next-Day" and "Short-Term." Below are the prediction data from the AI model: | Perspective | Current Price | Predicted Direction | Target Range | Confidence | | --- | --- | --- | --- | --- | | Next-Day (08-19) | 45857.27 | Bearish | 45161.7 ~ 45681.15 | 61.0% | | Short-Term (1 Week) | 45857.27 | Bearish | 44359.11 ~ 45520.63 | 61.0% | To be completely honest, the AI model's outlook for the broader market on Wednesday, August 19, 2026, leans "neutral-to-bearish." Although Taiwanese equities previously surged to historic highs, the subsequent pullback on high volume indicates that overhead selling pressure is indeed heavy. More critically, foreign institutional investors have built up a record-breaking short position of 85,000 contracts in the futures market. This acts like a massive insurance policy, hinting at potential high volatility in the short term. When the market opens on Wednesday, we need to closely monitor whether the spot market will drift toward the lows of the night session and futures. Whether the heavyweight TSMC can hold its ground is also a key factor. For beginners, it's highly recommended to watch from the sidelines and avoid blindly chasing highs! ## Global Market Status Here is the latest closing status of the TAIEX futures night session and the four major US stock indices. Please note that this section is **for reference only and does not contain predictions**: | Index | Close | % Change | | --- | --- | --- | | TAIEX Futures Night Session (TXF) | 45811 | -0.12% | | Dow Jones Industrial Average (DJI) | 53459.78 | -0.71% | | S&P 500 Index (GSPC) | 7745.06 | -0.69% | | Nasdaq Composite (IXIC) | 26644.91 | -0.59% | | Philadelphia Semiconductor Index (SOX) | 12621.01 | +1.32% | ## Key Stock AI Predictions Below is the actual AI-predicted stock information: | Stock | Direction | Target Range | Confidence | Technical Signals | | --- | --- | --- | --- | --- | | (No individual stock predictions today) | - | - | - | - | A friendly reminder from Mu-Yen: Today, the AI model did not generate any individual stock buy/sell predictions that met our standards. We adhere to the principle of honesty—quality over quantity—and will never make up data. ## Strategic Stock Selection Radar The following are the results of our strategic screening and **are not buy/sell predictions for individual stocks**. These stocks are selected using quantitative indicators based on high market popularity or specific technical signals to help you observe market dynamics: | Stock | Overall Score | Institutional Score | P/E Ratio | Valuation | | --- | --- | --- | --- | --- | | Wan Hai (2615) | 76 | 100 | 7.21 | Fair | | Formosa Plastics (1301) | 71 | 100 | - | - | | Evergreen (2603) | 69 | 100 | 9.44 | Expensive | | TSMC (2330) | 67 | 100 | 27.59 | Expensive | | ASUS (2357) | 67 | 100 | 13.3 | Fair | * **Wan Hai (2615)**: Trading volume has significantly expanded by 2.3x, with momentum strengthening. However, the Williams %R indicates overbought conditions, and there are signs of bearish divergence in the MACD. Be cautious of chasing highs. * **Formosa Plastics (1301)**: Volume-price bullish divergence signals stabilization, but the Williams %R has also entered the overbought zone. Watch out for short-term overhead resistance. * **Evergreen (2603)**: Momentum is strengthening, but the stock is overbought after a short-term rally. Coupled with a bearish MACD divergence, the risk of chasing the price is rising. * **TSMC (2330)**: Although its institutional score is a perfect 100, the technicals show a high-level KD death cross and overbought signals. With an expensive valuation, it faces short-term downward pressure. * **ASUS (2357)**: Trading volume surged by 3.19x, showing strong momentum. However, both RSI and KD indicators show overbought conditions and signs of weakening at high levels. Exercise extra caution when chasing highs. ## Recent Prediction Accuracy Review

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

As I always say, we report both the good and the bad—our accuracy is transparent for everyone to see. Recently, the AI model's directional accuracy for the TAIEX "Next-Day Forecast" was 44.4% (4 out of 9 times), with a perfect range hit rate of 3/9 and an average error of 1.05%. For the TAIEX "Short-Term Forecast," the directional accuracy was 50.0% (3 out of 6 times), with a perfect range hit rate of 1/6 and an average error of 2.29%. There is certainly room for improvement in our accuracy. When using these forecasts, please make sure to combine them with your own strategies and practice proper risk management. ## Disclaimer This content is automatically generated by an AI model based on quantitative data and is for research and reference purposes only. It does not constitute investment advice. Investing involves risk; please make your own judgments and assume full responsibility. --- ## 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-2026-08-18) 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 Solution Provider - 10+ years senior software engineer, now an AI Builder - Focused on large-platform architecture — North-American e-commerce, AI SaaS subscription billing - Combining AI Agents and automation to build evolvable product foundations ### 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. Everything runs in your browser; nothing is uploaded. - [VS Code Refactory](https://blog.markkulab.net/en/tools/refactory): Refactory is a VS Code refactoring extension: 34 actions plus a 37-rule code-smell inspection layer with a Code Health dashboard, across 18 languages, backed by 534 tests. It learns your repo's conventions: where interfaces live, where DI is registered, whether 'use client' belongs. It ranks files by git churn × complexity so you know what to fix first, and hands any smell to the Claude Code already on your machine. Free to use, and your source never leaves your computer. - [DB-Kit Database Manager](https://blog.markkulab.net/en/tools/db-kit): DB-Kit is a lightweight, cross-platform database manager built with Tauri + Rust + React. Manage MySQL, MariaDB, PostgreSQL, SQL Server, Oracle, SQLite, MongoDB, Redis, Kafka, Elasticsearch and RabbitMQ from one consistent interface: passwords encrypted in the OS keychain, SSH tunnels, full CRUD, a visual query builder, stacked multi-statement result sets, cross-connection data transfer and compare/sync, Excel / CSV import & export, visualized execution plans, ER diagrams, scheduled backups, SQL stress testing with p50–p99 latency percentiles, a 15-rule SQL review engine, Kafka message browsing with monitoring & alerts, a bilingual UI (Traditional Chinese / English), a built-in AI assistant (natural-language SQL, AI review and tuning advice) and the dbk CLI. Free and open source (MIT), with installers for Windows, macOS and Linux. - [VS Code Super Mermaid](https://blog.markkulab.net/en/tools/super-mermaid): Super Mermaid is a VS Code extension for beautiful Mermaid diagrams out of the box: auto-colored live preview, mouse pan & zoom, high-res PNG / SVG export, 21 templates and multiple themes. Free and open source (MIT). - [React Super Mermaid](https://blog.markkulab.net/en/tools/react-super-mermaid): react-super-mermaid is an open-source React component library: render beautiful Mermaid diagrams with a single , with built-in colorful / sketch themes, pan & zoom, in-diagram search, and high-res SVG / PNG export. Lightweight, SSR-safe, fully typed. Free and open source (MIT). - [Jira / Confluence Super Mermaid](https://blog.markkulab.net/en/tools/jira-super-mermaid): An Atlassian Forge app: write Mermaid syntax directly inside a Jira issue or a Confluence page and get flowcharts, sequence diagrams, state machines and Gantt charts. 11 diagram types, SVG / PNG export, light and dark themes, full CJK support. Runs on Atlassian: your diagrams live in your own site and the app calls no third-party service. Free, coming soon to the Atlassian Marketplace. - [Mermaid Live Preview](https://blog.markkulab.net/en/tools/mermaid-preview): Write Mermaid in your browser, see it render instantly, and share the whole diagram as a single link. No sign-up, nothing uploaded to a server, and mermaid.live share links work as-is. - [React Intl Phone Number](https://blog.markkulab.net/en/tools/react-intl-phone-number): react-intl-phone-number is an open-source React component: framework-agnostic and antd-free, with E.164 in/out, a searchable flag / country-code dropdown, configurable validation levels (strict / mobile-strict / loose), themeable CSS, and i18n — phone logic powered by google-libphonenumber. Lightweight and fully typed. Free and open source (MIT). - [Uptime Kuma Cluster](https://blog.markkulab.net/en/tools/uptime-kuma-cluster): Turn single-node Uptime Kuma into a highly available cluster: OpenResty + Lua smart load balancing, shared MariaDB state, health checks and automatic failover, plus cluster-management REST APIs. One Docker Compose command to start. Free and open source (MIT). - [Special Education](https://blog.markkulab.net/en/education): Learning materials crafted for special education students ### Daily podcasts - [Tech News](https://blog.markkulab.net/en/category/tech-news): Daily curated AI and tech trends. Catch the latest developments via audio summaries — covering AI applications, software architecture, DevOps, and engineering practice. — RSS: https://blog.markkulab.net/feed.xml - [AI Stock Chat](https://blog.markkulab.net/en/category/ai-stock-chat): Every trading day, an AI-analyzed take on the Taiwan stock market, delivered as a two-host conversation covering the session and the next-day outlook. — RSS: https://blog.markkulab.net/ai-stock-chat/feed.xml ### Newsletter [Subscribe to the newsletter](https://blog.markkulab.net/en/subscribe) — Be the first to know about new posts. No spam, unsubscribe anytime.