As pressure to strengthen defenses against security breaches increases, at least five Am Law 100 and Magic Circle firms are working to form an alliance that would allow them to ultimately share information with each other about cyberthreats and vulnerability.

The group includes Sullivan & Cromwell, Debevoise & Plimpton, Paul Weiss Rifkind Wharton & Garrison, Allen & Overy and Linklaters. It will be affiliated with the financial industry’s forum for cyberthreat discussions, called the Financial Services Information Sharing and Analysis Center (FS-ISAC), according to Bill Nelson, CEO of FS-ISAC.