This paper presents a mobile agents platform called SyMPA, compliant with the specifications of the MASIF standard from the OMG, that supports both stationary and mobile agents implemented using the high-level agent-oriented programming language CLAIM. Agents designed thanks to CLAIM are endowed with cognitive capabilities, are able to communicate with other agents and are mobile. The primitives of mobility are inspired from the ambient calculus. The paper is focused on SyMPA’s architecture, mobility, implementation and security elements.