In 1993 Dan Olofsson purchased the technical consulting department of tech company Sapia and renamed it Sigma.

The company struck a deal with Ericsson, becoming a "strategic partner" while expanding into wireless communications solutions.

[7] Noteworthy also were a 2009 arrangement with BTG Instruments AB to outsource technical documentation;[8] a 2011 win of a competitive contract to run IT functions for a new Swedish subsidiary of the Finnish energy firm Fortum;[9] and winning a contract competition to provide software services for an upgrade project for the public transport systems of Stockholm County.

[1] In 2006 Sigma AB bought a controlling stake (60%) in Kharkiv-based Ukrainian IT-company Eclipse for 8,7 million SEK.

The company, employing 2 000 workers including 150 consultants, reported resumption of normal activities within two months of the invasion.