All organizations are welcome to become EI Member Section Supporting Entities. To join EI, contact member-services@oasis-open.org.

Sponsor-level members

• AtHoc
• Desktop Alert, Inc.
• Sandia National Laboratories
• US Department of Defense (DoD)
• Warning Systems, Inc.

Contributor-level members

• Alerting Solutions, Inc.
• Canadian Association for Public Alerting and Notification (CAPAN)
• CellCast Technologies
• Edmond Scientific Company
• Emergency Interoperability Consortium
• ENISA
• ESI Acquisition, Inc.
• IEM
• Lockheed Martin
• Mitre Corporation
• MyStateUSA
• Open Geospatial Consortium, Inc. (OGC)
• OSS Nokalva
• Previstar Inc.
• Salzburg Research Forschungsgesellschaft
• Safe Environment Engineering
• Society of Broadcast Engineers
• Solace Systems
• SRA International, Inc.
• Telecommunication Systems Inc.
• US Department of Homeland Security
• WidePoint Corporation