Mécénat Musical Société Générale is the main sponsor of Les Siècles.

The orchestra is also financed by the French Ministère de la Culture et de la Communication and DRAC Picardie. Since 2011, the orchestra is supported by the Conseil Général de l’Aisne to reinforce its artistic and educational presence on this territory. The orchestra is in residency in the Forum du Blanc-Mesnil with the support of the Conseil Général de Seine-Saint-Denis and regularly performs in Hauts-de-Seine with the support of the Conseil Général 92 and the city of Nanterre.

The orchestra is sponsored by the Art Mentor Foundation, the Palazzetto Bru Zane, the Fondation Echanges and Bibliothèques, Katy & Matthieu Debost and occasionally by the SPEDIDAM, ADAMI and FCM. The orchestra has been invited to become Resident Orchestra in Grand Théâtre de Provence, Festival Berlioz de La Côte Saint-André, Festival de Saint-Riquier and Festival de l’Epau.