Shares surged as much as 10.5% to €29.20 after FTSE Russell confirmed that Technoprobe will replace diagnostics firm DiaSorin in Italy's flagship FTSE MIB index, effective at the start of trading on Monday, September 21, 2026. The move caps a remarkable run for a company that debuted on the Milan exchange at €5.70 just four and a half years ago and now commands a market capitalization of roughly €17.5 billion.
• Passive Money Is Coming, and Traders Know It
Index changes aren't just housekeeping — they create a schedule for big, rules-based trades. Funds that track the FTSE MIB, plus managers who stay close to it, generally need to own new members in roughly the right proportions. That can translate into steady buying ahead of September 21, then a concentrated burst near the close on the switch date.
Technoprobe is expected to land at roughly a 0.55% index weight — modest, but enough to generate meaningful volume in a stock that until now sat outside the blue-chip radar.
• The Business Behind the Ticker Is Booming Technoprobe makes probe cards — the precision tools that test every chip before it leaves the factory. It operates in a near-duopoly with U.S.-based FormFactor, which is valued at roughly half Technoprobe's size.
In the first half of 2026, revenue hit €464 million, up 42.4% year-over-year, and the company now guides for full-year revenue of €1.05–€1.1 billion with margins of 46–48%.
About 38% of revenue is tied to AI-related chip testing , the segment driving virtually all of the growth.
• The Price Tag Raises Questions
As of August, Technoprobe traded at roughly 21× revenue and nearly 49× EBITDA — rich by any semiconductor standard. UBS estimates €347 million in net profit for 2026, versus just €97 million in 2025 , so earnings growth is real. But that still implies a price-to-earnings ratio above 50, meaning any stumble in AI chip demand would hit the stock hard.
• What Comes After the Index Pop
The traditional consumer-chip segment remains under pressure, with no recovery expected before 2027.
Meanwhile, Technoprobe plans to double production capacity over 2026–2027 , a capital-heavy bet that the AI testing boom has staying power. If it does, the FTSE MIB inclusion is simply a formality confirming what the market already sees. If it doesn't, today's buyers may be the last ones through the door at the top.