On June 10, Silex Microsystems announced that its subsidiary Silex International plans to acquire the 19% stake in Silex Beijing held by the China Big Fund for RMB 623.63 million ($85.6M) . After the deal, Silex Micro would indirectly own 100% of Silex Beijing. The transaction, approved by state‑asset authorities, is pending final auction results.

Silex Beijing is Silex Micro’s core domestic MEMS foundry, in production since June 2021. Pre‑transaction ownership: Silex International 76%, Big Fund 19%, employee platform Jixin Sensor 5% (which waived its right of first refusal). The fab currently mass‑produces silicon microphones, BAW filters, micro‑mirrors, and high‑frequency devices, with gas sensors, biochips, and IMUs in small‑batch pilot runs.

The foundry remains unprofitable due to capacity ramp‑up, expansion, and high R&D/depreciation costs: 2025 revenue RMB 172.97M with net loss of RMB 309.89M ; Q1 2026 revenue RMB 39.07M , net loss RMB 58.50M .

The equity valuation (market approach) as of Dec 31, 2025 was RMB 3.17B , a 204.48% premium over book value. Silex Micro sees the move as key to integrating MEMS operations, while the Big Fund’s exit follows its normal investment cycle.

ICgoodFind: Big Fund exits the MEMS foundry as Silex takes full control, aiming for long‑term synergy – but profitability remains a near‑term hurdle.