The Rise of 'Invisible AI': How Traditional Industrial Giants Dominate the Tech Era

20 April 2026 – The Tokyo Stock Exchange (TSE) is witnessing a historic shift in capital flows. Investors are no longer focusing on pure software companies; instead, they are pouring money into long-established industrial enterprises – entities that hold the "physical keys" to operating artificial intelligence.

1. The Unitika (3103) phenomenon: From textiles to AI server components

Unitika Ltd. (3103), a symbol of Japan's textile industry, has become the hottest name on the stock exchange in recent days.

• Why is it hot? The frenzy stems from Unitika's mastery of ultra-thin glass cloth production technology. This is a core material for manufacturing printed circuit boards (PCBs) used in high-performance AI servers. Amid the boom in AI data centres, the demand for materials with excellent heat dissipation and ultra-fast signal transmission has turned Unitika's product into a rare commodity.
• Stock price (20 April 2026): Closed at 3,745 JPY, hitting the daily limit with a +21.39% increase from the previous session.

2. Ajinomoto and TOTO: Semiconductor "tycoons" in consumer goods clothing

Why would a monosodium glutamate company and a toilet manufacturer grow thanks to AI? The answer lies in their materials science expertise.

• Ajinomoto (2815): Holds nearly 100% of the market share for ABF film insulation. Without this film, graphics processing units (GPUs) from Nvidia or AMD cannot connect to the circuit board. Ajinomoto is, in essence, a sophisticated chemical company disguised as a food business.
  • Stock price (20 April 2026): 5,650 JPY.
• TOTO (5332): Ceramic firing technology from toilets has been elevated by TOTO into fine ceramics. They produce "electrostatic chucks" that secure wafers during the EUV chip etching process. Without TOTO, the 2nm chip manufacturing process cannot be carried out with precision.
  • Stock price (20 April 2026): 5,547 JPY.

3. A list of 7 similar "hidden" stocks under expert scrutiny

Below are companies with similar characteristics: a traditional core business but holding proprietary AI-supporting technology.

Expert view: "Physical advantage" is eternal

Analysts in Tokyo note: "Software can be replaced by new algorithms, but the physical limits of heat dissipation and conductive materials cannot be bypassed. Companies like Unitika and Ajinomoto have spent decades optimising materials, creating an 'economic moat' that new technology rivals cannot cross overnight."

---

Disclaimer: This information is for investment reference purposes only.