| A | Associazione Italiana di Richercha Operativa | (NPO) |
| Armasuisse | ||
| B | BSS Informatik | |
| C | Cantaluppi & Hug | |
| Chinese Society of Operations Research | (NPO) | |
| COOP Schweiz | ||
| CRAS AG | ||
| D | Département d'informatique | Université de Fribourg |
| G | GOR | (NPO) |
| I | I.F.O.R.S. | (NPO) |
| O | Operational Research Society (UK) | (NPO) |
| Operations Research Society of South Africa | (NPO) | |
| R | RDP Organisations AG | |
| S | SBB | |
| Schiltknecht Consulting Group AG | ||
| SUVA | ||
| SwissRe Company | ||
| Z | Zürich Leben |