When investors think about the artificial intelligence boom, they tend to picture chip designers like Nvidia or sprawling data centers humming with servers. They almost never picture toilets. Yet in 2024, one of the most striking AI-related rallies on the Tokyo Stock Exchange belonged to Toto, a 109-year-old Japanese company best known for its high-tech bidet washlets. After Toto announced plans to ramp up production of a specialized semiconductor component, its shares jumped 18 percent to a five-year high of ¥6,425, bringing the stock's gain for the year to more than 46 percent.
The reason lies in an obscure piece of equipment called an electrostatic chuck — a precision ceramic device that uses static electricity to hold silicon wafers perfectly still while they are processed into memory chips. Toto, it turns out, is the world's second-largest producer of these chucks, drawing on decades of expertise in advanced ceramics originally developed for toilet bowls. As demand for Nand flash memory has soared alongside AI infrastructure spending, Toto's semiconductor components division has surged. Sales there grew 34 percent year-on-year and now account for more than half of the company's operating profit, which itself climbed 11 percent to ¥53.8 billion in the year ending in March. Toto expects the unit's sales to grow another 27 percent and has pledged ¥30 billion in new investment by 2028.
But here's the catch: most investors had no idea this business even existed inside a company branded around bathrooms. That changed in February, when activist investor Palliser Capital took a stake in Toto and publicly urged management to highlight the chip unit's importance and pour more money into it. The strategy worked. As Palliser's campaign brought attention to Toto's hidden semiconductor exposure, the share price climbed and the company became, in the language of markets, an artificial intelligence play.
Toto is not alone. Several Japanese manufacturers with no obvious connection to computing have found themselves repriced by global investors hunting for AI-adjacent businesses. Kioxia, a maker of Nand flash memory, has now eclipsed Sony in market value. The cosmetics company Kao began producing chips last year at a former cleaning facility. Ajinomoto, the firm that invented monosodium glutamate, is investing more than ¥25 billion to expand production of an insulating film critical for motherboards by 2030. What unites these companies is industrial expertise — in ceramics, chemistry, precision manufacturing — that turns out to be unexpectedly valuable in chip supply chains.
The Toto story carries a warning as well. The company cautioned that its core toilet and bathroom-fittings business faces possible shortages of adhesives and plastics tied to energy disruptions in the Middle East. Toto suspended new orders of prefabricated baths in mid-April, and although it has resumed taking orders, Japanese building contractors say they still cannot reliably obtain bathroom units. The same global forces that lifted the chip division — concentrated supply chains, geopolitical fragility, sudden shifts in demand — could squeeze the traditional business that built the company in the first place.
For now, the market is celebrating. But Toto's rally is also a lesson in where value hides in modern technology booms. The companies that win are not always the famous ones designing the products consumers see. Sometimes they are the ones quietly making the precision parts that everything else depends on — even when those parts came, originally, from a factory that perfected porcelain for a very different purpose.
A 109-year-old Japanese company famous for high-tech toilets just became one of the year's hottest AI stocks — without making a single chatbot, GPU, or data center.
Toto, the Japanese firm best known for its luxury bidet toilets, saw its share price jump 18% to a five-year high after announcing it would ramp up production of a little-known semiconductor component called an electrostatic chuck. The company also reported record annual profits, with operating profit climbing 11% to ¥53.8 billion ($340m).
Here's the twist: Toto is the world's second-largest maker of these chucks, which are essential for manufacturing Nand flash memory chips — the kind of storage that powers AI data centers. Sales in that division rose 34% year-on-year and now account for more than half of Toto's operating profit. The company plans to invest ¥30 billion to expand production by 2028.
When a gold rush hits, the people who get rich aren't always the prospectors — sometimes it's the ones selling shovels, jeans, and pickaxes. Toto is a shovel-seller in the AI boom.
If you're thinking about investing, picking a career in tech, or just trying to understand the AI economy, Toto is a lesson in where value actually hides. The flashy AI names dominate headlines, but the real bottlenecks — and real profits — are often in obscure components made by century-old industrial firms. The next time you read about an 'AI stock,' ask what physical thing it actually makes.
Japan's industrial base, written off for decades as stagnant, is quietly being repriced by global investors hunting for AI-adjacent plays. Watch for more activist campaigns pushing Japanese conglomerates to spotlight hidden tech divisions — and watch for the risk too: Toto warned that Middle East energy shocks could disrupt supplies of adhesives and plastics for its core toilet business, a reminder that even shovel-sellers are vulnerable to shocks they can't control.