Pure-play MEMS foundry Silex sets the price for its IPO in Stockholm.

      The pure-play MEMS foundry backed by Bure Equity and Creades was priced at SEK 81 per share, with the offering significantly oversubscribed. Key cornerstone investors included Capital Research, Fidelity, AFA, AP2, AP3, AP4, Swedbank Robur, and Carnegie, who collectively accounted for about three-quarters of the offering.

      Silex Microsystems saw a strong opening on its Nasdaq Stockholm debut on Wednesday, with the chipmaker’s shares rising shortly after the IPO priced at SEK 81 each. The offering was heavily oversubscribed during the bookbuild process and was primarily allocated to institutional cornerstone investors, resulting in limited availability for retail investors on the first day.

      The IPO raised around SEK 1.99 billion ($217 million) through a 24.6-million-share offering, leading to an equity valuation of approximately SEK 8.9 billion at the time of the IPO. The trading symbol for the company is SILEX, and the settlement is set for May 11.

      Silex claims to be the world’s leading pure-play MEMS foundry, producing micro-electromechanical systems for clients in various sectors including automotive, industrial, life sciences, and consumer electronics, from a single 200mm wafer production facility located in Järfälla, near Stockholm.

      The pure-play model signifies that Silex fabricates chips designed by other firms instead of creating its own products, akin to TSMC’s dealings with fabless semiconductor companies, but within the more niche MEMS market.

      The financial details surrounding the listing are notably transparent compared to other recent European chip IPOs. For the year ending December 31, 2025, the company reported net sales of SEK 1,385 million and EBIT of SEK 368 million, resulting in an operating margin of about 27 percent. Early figures for the first quarter of 2026 were even better, showing SEK 375 million in revenue and SEK 128 million in EBIT, with an operating margin exceeding 34 percent. These metrics contribute to the appeal of a pure-play foundry for the institutional cornerstone investors behind the majority of the offering.

      The cornerstone investors significantly influenced the stock’s anticipated trading behavior. Together, they acquired ordinary shares valued at around SEK 1.501 billion, representing approximately 75 percent of the offering. Investors included Creades, AFA Insurance, Tredje AP-fonden, Capital Research Global Investors, Swedbank Robur Fonder, Fjärde AP-fonden, Andra AP-fonden, Fidelity International, and Carnegie Fonder.

      This diverse group of three Swedish national pension funds, two of the country’s largest fund managers, two significant US institutional investors, and Sweden's largest insurance company creates a remarkably strong cornerstone shareholder base for a chip listing in Stockholm.

      Ownership after the IPO remains concentrated, with Bure Equity maintaining about 34.2 percent of the outstanding ordinary shares and Creades holding around 10.1 percent. These two firms were instrumental in the original investor consortium that took Silex from its former Chinese state-aligned owner in 2023, restoring Swedish ownership after roughly seven years under Sai MicroElectronics.

      This ownership shift is significant: Silex operated in the latter half of the 2010s as a Swedish facility within a Chinese corporate framework until the geopolitical shifts of 2022 and 2023 rendered this structure unsustainable both commercially and politically.

      The MEMS market is experiencing growth driven by AI-related demand. Recent contracts include a high-volume manufacturing partnership with the Norwegian audio company sensiBel for high-fidelity MEMS microphones, where the demand for processors is increasingly influenced by rising on-device AI workloads across the semiconductor industry.

      Silex's customer portfolio is diverse, with no single end-market dominating, yet the same demand trends that have led to increased foundry capacity worldwide support the successful execution of a Stockholm IPO at this valuation multiple.

      Two questions remain unanswered in the public domain. The first concerns the extent of the price movement on the debut day; Bloomberg reported a substantial rise, but the exact percentage is not available in subsequent analyses. The second pertains to how Silex will utilize the funds generated from the IPO.

      The prospectus suggests that funds will be directed toward capacity expansion at the Järfälla facility and providing flexibility for selective acquisitions within the broader MEMS supply chain. Investors will initially be interested in whether the company can successfully invest this capital before the broader AI-driven demand cycle stabilizes.

      For the time being, the listing has accomplished its objectives. Silex achieved a public market valuation near SEK 8.9 billion, garnered strong cornerstone support, and offered Bure Equity and Creades a partial route to monetization while maintaining a combined controlling stake. The forthcoming Q2 results will mark the first reporting cycle for Silex as a publicly traded entity.