Sero is a provider of Electronic Manufacturing Services (EMS). The company focuses on the development, co‑engineering, assembly, calibration and testing of electronic components for industrial, medical and automotive applications. The electronic components manufactured by the group are used in, among other things, electric‑vehicle charging stations, heat meters, cardiac monitoring devices, photovoltaic inverters and e‑bike motors. Sero’s key customers include a number of blue‑chip industrial companies.

The company is headquartered in Rohrbach and operates additional production sites in Slovakia and the United States.