Taiwanese chip substrate maker Kinsus is falling sharply after a big shareholder said it would sell a chunk of its stock, a setback for a share price that had been racing toward a record.

• Pegatron's investment arm filed plans to sell a large block of Kinsus shares to raise cash.
• Kinsus dropped more than 9% in early trading, hit further by a broader pullback in Taiwan stocks.
• The stock had been one of the year's stars, hitting repeated record highs and closing in on the NT$1,000 mark.
• Business itself is strong: first-half profit already beat all of last year, helped by booming demand for ABF substrates used in AI chips.
• Kinsus has raised its investment budget twice this year, adding roughly NT$19.6 billion as substrate supply stays tight and prices rise.

Outlook: The selling pressure delays the run at NT$1,000, but tight ABF supply and AI chip demand still point to stronger profits ahead.