X-FAB Stock Surges 76% Intraday on Retail Meme Frenzy Sparked by X Post

Shares of Paris-listed chip foundry X-FAB (XFAB) soared as much as 76% intraday on May 27, 2026, reaching a record high before closing up 33% at €12.00. The surge was fueled by a viral post on X from account Serenity (@aleabitoreddit), which called the stock an “interesting long-term play” tied to photonics and power semiconductors. No company-specific news prompted the move. The post ignited a retail-driven rally, with X-FAB briefly becoming the second-most-traded stock on Germany’s Tradegate platform, behind only Micron Technology. CEO Damien Macq said the company was unaware of any undisclosed material development to explain the spike. The account, which now has over 410,000 followers, has previously triggered sharp moves in Raspberry Pi and Soitec. Analysts remain skeptical. The average price target stands at €5.5, and only one of eight analysts rates the stock a buy. Berenberg recently downgraded it to hold, and AllianceBernstein cited limited near-term visibility. The episode highlights intensifying meme-stock speculation in the semiconductor space amid the AI boom.