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Siltronic AG

Siltronic makes ultra-pure silicon wafers — the blank discs that computer chips are built on — and sells them to chipmakers around the world.

Siltronic makes the starting material for almost every computer chip on Earth: a perfectly round, mirror-polished disc of pure silicon, roughly the size of a dinner plate. Chipmakers buy these blank wafers, then print billions of microscopic circuits onto them and cut the result into individual chips. Without a clean, flawless wafer underneath, none of it works — a single stray atom can ruin a chip, so the purity here is extreme.

The business is essentially a race to make something almost impossibly perfect, at enormous scale and low cost. Siltronic grows giant silicon crystals, slices them into wafers thinner than a sheet of paper, and polishes them to near-atomic smoothness. Most of its wafers are 300 millimeters across, the industry standard for cutting-edge chips, and it sells to the biggest chipmakers, including TSMC, Samsung, and Intel. Customers stay loyal because switching suppliers means re-qualifying every manufacturing step — a slow, expensive process — so once Siltronic is designed in, it tends to stay designed in. That loyalty cuts both ways. Siltronic's fortunes swing with the chip cycle: when demand for phones, cars, and data centers booms, wafer prices and volumes rise; when inventories pile up, orders slump fast. The company is based in Munich, Germany, and its roots run back to Wacker-Chemie, which is why it was long known as Wacker Siltronic before listing on the Frankfurt exchange in 2015. A planned merger with Taiwan's GlobalWafers was blocked by regulators in 2022, leaving Siltronic independent.

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Making wafers is brutally capital-intensive. Building a new plant costs billions and takes years, so the company spends heavily on factories and equipment rather than showering cash on shareholders. In good years it pays a modest dividend and keeps the rest to fund expansion and ride out downturns. That is the whole gamble: spend big in the booms, survive the busts, and stay essential to an industry that cannot build a single chip without you.

Saved answer · last researched 12 Nov 2026