[1][2] In 1991 Sema and British Aerospace established the BAeSEMA naval systems joint venture to produce naval systems: it was dissolved in November 1998 when BAe purchased Sema's 50% share for £77 million.

In the same time frame, Sema also acquired Syntax in Italy, formerly the IT Services division of Olivetti, adding another important market to its geography.

The messaging unit was merged with Taral Networks and spun off as Airwide Solutions.

The Smart Card and Terminal Department (formerly part of Schlumberger Test & Transactions) became Axalto,[7] which later merged with Gemplus International to form Gemalto.

Sema originally stood for Société d'Économétrie et de Mathématiques Appliquées.