This is pretty anecdotal and I doubt there will be a list of names written down somewhere. However have a look at the number of acknowledgements in Microsoft's security bulletins from last year:
Palo Alto Networks - 34
Qihoo/360 - 27
FireEye - 14
Tencent - 14
Trend Micro - 12
Fortinet - 7
McAfee - 2
VMware - 2
Kaspersky - 1
They are a pretty unsavory company but they really know what they are doing.
Palo Alto Networks - 34
Qihoo/360 - 27
FireEye - 14
Tencent - 14
Trend Micro - 12
Fortinet - 7
McAfee - 2
VMware - 2
Kaspersky - 1
They are a pretty unsavory company but they really know what they are doing.
Source: https://technet.microsoft.com/library/security/dn903755.aspx