1. Cisco Systems Inc.
2. Juniper Networks Inc.
3. IBM Corporation
4. Hewlett Packard Enterprise Development LP
5. VMware Inc.
6. Nokia Corporation
7. Huawei Technologies Co. Ltd.
8. Extreme Networks Inc.
9. NetBrain Technologies Inc.
10. SolarWinds Worldwide
LLC
11. BMC Software Inc.
12. Micro Focus International plc
13. Apstra Inc.