Tronics Microsystems S.A. Tronics Microsystems SA (ALTRO.PA), a subsidiary majority-owned by TDK Electronics AG TDK Corporation, designs, manufactures and sells inertial micro-electro-mechanical systems (MEMS) sensor solutions for precise motion sensing, positioning, navigation and condition monitoring of critical assets; its core offerings include tactical-grade digital closed-loop accelerometers and gyroscopes, high-temperature MEMS accelerometers for energy applications such as directional drilling, vibration sensors for industrial asset health monitoring, and custom inertial MEMS foundry services utilizing silicon-on-insulator (SOI) surface micromachining, deep reactive ion etching, wafer-level packaging and nano-imprint technologies. The company serves demanding markets in transportation, energy, industrial automation, oil and gas, marine, subsea, railway, aerospace and condition-based monitoring sectors with EN9100-certified production facilities; it operates primarily from its headquarters in Crolles near Grenoble, France, with a subsidiary in Dallas, United States, and targets international customers through sales in France, the rest of Europe, the Americas and other regions. Founded in 1997 as a spin-off from CEA-Leti, Tronics employs around 100 engineers and scientists and generates revenue of approximately 14.9 million euros from French and American operations. Recent developments include TDK Electronics AG's initiation of a public tender offer in 2025 to acquire the remaining 2.56% stake at 5.56 euros per share followed by a squeeze-out to fully consolidate ownership, the launch of a high-temperature closed-loop MEMS accelerometer for complex energy operations and the appointment of Florian Gibon as Commercial Director to drive sales growth; the company also expanded into machine health monitoring with new vibration sensor solutions showcased at electronica 2024 and plans to feature products at IEEE Inertial 2025 and OTC 2025.