ASE Technology Holding Co Ltd (NYSE: ASX) is a major global provider of semiconductor assembly and testing services. The company plays a crucial role in the electronics supply chain by packaging and testing silicon chips before they are used in devices such as smartphones, computers, servers, and AI infrastructure.
On June 23, 2026, Chief Administration Officer Uang Du-Tsuen sold 3,000 ordinary shares at NT$697 per share, for a total value of about NT$2.09 million. The same filing also reported two earlier June sales: 3,000 shares at NT$611 on June 18 and 5,000 shares at NT$667 on June 22. In total, the executive sold 11,000 ordinary shares across the three transactions for about NT$7.26 million. After the transactions, Uang Du-Tsuen directly held 767,000 ordinary shares.
This insider selling adds to investor attention around valuation. GuruFocus has described ASX as significantly overvalued compared with its GF Value estimate, suggesting that the market price has moved far ahead of that proprietary fair-value measure.
Despite valuation concerns, ASE continues to benefit from strong demand in advanced semiconductor packaging. In the first quarter of 2026, the company reported gross margin of 20.1%, up from 16.8% a year earlier. The improvement was supported by a higher mix of ATM revenue, better factory utilization, and demand for advanced packaging services.
The growth outlook remains closely tied to AI chips and high-performance computing. ASE now expects revenue from its leading-edge advanced packaging services to exceed $3.5 billion in 2026. This reflects strong customer demand for packaging technologies needed in next-generation AI semiconductor applications.
ASX shares have risen sharply over the past year, trading near the upper end of their 52-week range. While the company’s operating momentum remains strong, the combination of insider selling and elevated valuation metrics suggests investors may need to balance AI-driven growth expectations against valuation risk.
