Report Description

This report, much like our original certs and CAs report, focuses on issuers of SSL enabling certificates found on web servers. Unlike our original report, however, this report has a couple of key differences to it:

• Reports on top 100 CAs. The original report only paid attention to the major CAs at the time the report was produced. This report lists the top 100 CAs for the month. You will find here many self-signing organizations such as universities, telecommunications firms, etc.
• Uses issuer name as identifier. Our original report only counted a certificate towards an organization if we were able to prove, by virtue of verifying the key, that the organization in question actually signed the certificate. This had a notable problem with it - we don't always have the public key of the CA. In at least one case, a CA doesn't make their public key available unless you sign a license agreement.

  This report doesn't have that problem, since it only uses the issuer Organization Name to uniquely identify the issuing CA.

CA	May 2017 Count	May 2017 %	April 2017 Count	April 2017 %	Growth %
DigiCert	2,629,025	46.67	496,392	41.62	12.12
GoDaddy.com, Inc.	683,285	12.13	201,117	16.86	-28.08
COMODO CA Limited	557,582	9.90	121,450	10.18	-2.81
GeoTrust Inc.	426,304	7.57	89,235	7.48	1.14
GlobalSign nv-sa	261,999	4.65	55,527	4.66	-0.11
Let's Encrypt	141,207	2.51	23,737	1.99	25.94
Symantec Corporation	126,350	2.24	30,888	2.59	-13.40
Gandi	95,708	1.70	18,160	1.52	11.57
thawte, Inc.	73,130	1.30	14,222	1.19	8.86
Starfield Technologies, Inc.	47,158	0.84	9,989	0.84	-0.06
Amazon	39,400	0.70	10,586	0.89	-21.21
Unknown	38,995	0.69	6,451	0.54	27.97
Microsoft Corporation	36,051	0.64	12,944	1.09	-41.04
Unizeto Technologies S.A.	35,525	0.63	9,856	0.83	-23.69
cPanel, Inc.	34,113	0.61	4,756	0.40	51.84
Internet2	29,847	0.53	8,909	0.75	-29.08
Entrust, Inc.	26,624	0.47	6,608	0.55	-14.70
TERENA	25,485	0.45	6,441	0.54	-16.24
Google Inc	23,984	0.43	8,969	0.75	-43.39
StartCom Ltd.	20,596	0.37	5,522	0.46	-21.04
Network Solutions L.L.C.	20,492	0.36	4,484	0.38	-3.25
Parallels	18,761	0.33	2,428	0.20	63.58
Trustwave Holdings, Inc.	13,878	0.25	2,521	0.21	16.54
SomeOrganization	13,168	0.23	2,236	0.19	24.67
none	10,468	0.19	1,108	0.09	100.01
GeoTrust, Inc.	10,087	0.18	1,773	0.15	20.44
QuoVadis Limited	9,104	0.16	1,974	0.17	-2.36
Cybertrust Japan Co., Ltd.	7,046	0.13	1,160	0.10	28.59
DreamHost	7,018	0.12	1,055	0.09	40.83
Odin	6,864	0.12	734	0.06	97.97
SecureCore	5,399	0.10	674	0.06	69.58
WoSign CA Limited	4,664	0.08	925	0.08	6.74
Internet Widgits Pty Ltd	4,152	0.07	1,266	0.11	-30.57
Comodo Limited	4,036	0.07	682	0.06	25.28
home.pl S.A.	4,004	0.07	732	0.06	15.80
Hostpoint GmbH	3,668	0.07	367	0.03	111.58
nazwa.pl sp. z o.o.	3,614	0.06	680	0.06	12.51
SSL.com	3,589	0.06	779	0.07	-2.47
SECOM Trust Systems CO.,LTD.	3,463	0.06	349	0.03	110.06
ispgateway	3,371	0.06	371	0.03	92.36
Corporation Service Company	3,165	0.06	670	0.06	0.00
CloudFlare, Inc.	2,769	0.05	800	0.07	-26.73
Verisign	2,716	0.05	519	0.04	10.79
Thawte, Inc.	2,665	0.05	433	0.04	30.30
KDDI Web Communications Inc.	2,665	0.05	123	0.01	358.68
Plesk	2,450	0.04	267	0.02	94.26
Trust Provider B.V.	2,223	0.04	274	0.02	71.76
io.ua	2,112	0.04	533	0.04	-16.11
National Institute of Informatics	2,108	0.04	335	0.03	33.21
Government of Korea	2,071	0.04	456	0.04	-3.85
Pizza-Taxi.de GmbH / CA	1,909	0.03	1,510	0.13	-73.24
T-Systems International GmbH	1,696	0.03	271	0.02	32.49
Equifax (Geotrust)	1,632	0.03	260	0.02	32.88
TAIWAN-CA	1,544	0.03	425	0.04	-23.09
DOMENY.PL sp. z o.o	1,486	0.03	294	0.02	7.00
AlphaSSL	1,333	0.02	205	0.02	37.66
WebSupport, s.r.o.	1,314	0.02	165	0.01	68.59
EUNETIC GmbH	1,218	0.02	234	0.02	10.19
SwissSign AG	1,196	0.02	249	0.02	1.68
Rede Nacional de Ensino e Pesquisa - RNP	1,196	0.02	237	0.02	6.83
UIC	1,169	0.02	344	0.03	-28.06
KEYNECTIS	1,164	0.02	285	0.02	-13.54
U.S. Government	1,115	0.02	306	0.03	-22.86
Actalis S.p.A./03358520967	1,071	0.02	65	0.01	248.82
NetLock Kft.	1,013	0.02	214	0.02	0.21
Volusion, Inc.	988	0.02	0	0.00	N/A
Hosting Ukraine LLC	917	0.02	184	0.02	5.50
Default Company Ltd	850	0.02	107	0.01	68.17
AC Camerfirma S.A.	822	0.01	178	0.01	-2.24
Dreamcommerce S.A.	815	0.01	170	0.01	1.49
Japan Registry Services Co., Ltd.	784	0.01	63	0.01	163.45
Trend Micro Inc	782	0.01	158	0.01	4.78
Globe Hosting, Inc.	663	0.01	112	0.01	25.32
Verizon Enterprise Solutions	660	0.01	536	0.04	-73.93
CAcert Inc.	659	0.01	160	0.01	-12.81
TBS INTERNET	646	0.01	156	0.01	-12.33
FNMT-RCM	632	0.01	135	0.01	-0.89
Intermediate Certificate	612	0.01	84	0.01	54.24
Zimbra Collaboration Server	594	0.01	73	0.01	72.26
Root CA	584	0.01	114	0.01	8.45
Verein zur Foerderung eines Deutschen Forschungsnetzes e. V.	583	0.01	98	0.01	25.94
Buypass AS-983163327	576	0.01	99	0.01	23.17
WEDOS Internet, a.s.	544	0.01	0	0.00	N/A
XX	535	0.01	105	0.01	7.87
Comodo CA Limited	527	0.01	63	0.01	77.09
Test Self SSL Company	526	0.01	97	0.01	14.80
ACCV	522	0.01	195	0.02	-43.33
Thawte	513	0.01	0	0.00	N/A
ICP-Brasil	512	0.01	130	0.01	-16.62
Nijimo, Inc.	483	0.01	0	0.00	N/A
Webhosting	471	0.01	0	0.00	N/A
HydrantID (Avalanche Cloud Corporation)	464	0.01	148	0.01	-33.63
Apache HTTP Server	437	0.01	75	0.01	23.35
SWsoft, Inc.	412	0.01	0	0.00	N/A
Parallels, Inc.	407	0.01	63	0.01	36.76
KPN Corporate Market BV	389	0.01	97	0.01	-15.10
Universitaet Stuttgart	367	0.01	0	0.00	N/A
FIDUCIA & GAD IT AG	354	0.01	0	0.00	N/A
AffirmTrust	353	0.01	0	0.00	N/A
Firstserver, Inc	341	0.01	0	0.00	N/A

Note: Readers are cautioned that the Growth percentages are based on a CA's market share penetration rather than the absolute number of certificates we detected. Thus, it is possible for the number of certificates to increase, while the growth is actually a negative value.