Joshua Waters JWaters02

## companies-using-zos.md

      
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              April 24, 2026 14:37
            
              
                Companies known to use IBM z/OS mainframes - please write comments to suggest new companies
              
          
    Companies known to use IBM z/OS mainframes

Customer orgs


ABN AMRO (Netherlands)
Allianz (Germany)
Allied Irish Bank PLC
American Express (USA)
ANZ Bank (Australia)
AT&T (USA)