[5]: 87 In 1926, a capital increase allowed the large Belgian commercial banks to strengthen their presence among the SNCI's shareholders and to gradually dominate its board.
Over time, it opened branches and offices in Antwerp, Bruges, Charleroi, Ghent, Hannut, Hasselt, Kortrijk, Leuven, Liège, Lokeren, Mechelen, Mons, Namur, Nivelles, Saint-Nicolas, Tournai, Turnhout, Verviers, and Vilvoorde.
[1]: 60-62 In 1973, the SNCI was a founding member of a club of specialized long-term credit institutions in the European Community, together with France's Crédit National, Germany's Kreditanstalt für Wiederaufbau, Italy's Istituto Mobiliare Italiano, the Netherlands' Nationale Investeringsbank, and the UK's Finance Corporation for Industry among others.
[1]: 50 From 1968 to 1986, the Crédit à l'Industrie partnered with ASLK / CGER and became a major provider of state aid to Belgian industrial businesses, e.g. in the textile and steel sectors.
The Belgian government coalition agreement of 8 May 1988 foresaw a combination of public-sector banks, resulting in legislation of 17 June 1991 that mandated the integration of the SNCI into a single group together with the Crédit Communal de Belgique and the Office Central de Crédit Hypothécaire.