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	April 2021 Count	April 2021 %	March 2021 Count	March 2021 %	Growth %
Let's Encrypt	3,161,905	25.05	3,070,399	24.87	0.72
Sectigo Limited	2,467,099	19.54	2,405,626	19.49	0.30
DigiCert	1,613,963	12.79	1,599,053	12.95	-1.29
cPanel, Inc.	767,275	6.08	748,252	6.06	0.29
GlobalSign nv-sa	570,297	4.52	559,921	4.54	-0.39
Unknown	482,466	3.82	464,272	3.76	1.63
GoDaddy.com, Inc.	411,841	3.26	408,666	3.31	-1.44
Unizeto Technologies S.A.	263,336	2.09	258,209	2.09	-0.26
Amazon	246,936	1.96	240,343	1.95	0.48
Starfield Technologies, Inc.	230,387	1.83	224,607	1.82	0.32
Cloudflare, Inc.	214,257	1.70	207,363	1.68	1.05
COMODO CA Limited	170,788	1.35	175,319	1.42	-4.73
SecureCore	130,772	1.04	127,159	1.03	0.58
Plesk	109,839	0.87	107,108	0.87	0.29
Gehirn Inc.	99,944	0.79	97,732	0.79	0.01
SomeOrganization	97,783	0.77	92,626	0.75	3.25
none	94,997	0.75	92,497	0.75	0.44
Google Trust Services	90,894	0.72	90,344	0.73	-1.60
DreamHost	76,941	0.61	73,329	0.59	2.62
ispgateway	70,708	0.56	70,064	0.57	-1.30
Microsoft Corporation	62,472	0.49	62,012	0.50	-1.47
Internet2	54,321	0.43	53,815	0.44	-1.28
home.pl S.A.	45,830	0.36	44,656	0.36	0.37
Actalis S.p.A.	44,088	0.35	42,959	0.35	0.37
GoGetSSL	43,937	0.35	42,045	0.34	2.20
Gandi	37,605	0.30	36,435	0.30	0.94
Entrust, Inc.	36,681	0.29	36,785	0.30	-2.48
Parallels	36,262	0.29	35,965	0.29	-1.39
GEANT Vereniging	36,041	0.29	33,971	0.28	3.76
TrustAsia Technologies, Inc.	33,768	0.27	32,715	0.26	0.95
Webhosting	32,769	0.26	32,039	0.26	0.03
Trustwave Holdings, Inc.	30,836	0.24	30,769	0.25	-1.99
Odin	30,438	0.24	30,475	0.25	-2.32
TERENA	27,001	0.21	28,927	0.23	-8.71
GeoTrust Inc.	24,653	0.20	24,771	0.20	-2.66
Japan Registry Services Co., Ltd.	24,276	0.19	23,853	0.19	-0.46
Cybertrust Japan Co., Ltd.	22,595	0.18	22,372	0.18	-1.22
SECOM Trust Systems CO.,LTD.	19,719	0.16	17,406	0.14	10.80
Internet Widgits Pty Ltd	18,616	0.15	17,950	0.15	1.43
Acme Co	18,247	0.14	17,523	0.14	1.84
Apache HTTP Server	16,470	0.13	16,443	0.13	-2.04
WebSupport, s.r.o.	15,741	0.12	15,504	0.13	-0.70
Soluciones Corporativas IP, SL	15,580	0.12	14,758	0.12	3.25
Network Solutions L.L.C.	15,556	0.12	14,861	0.12	2.37
Verein zur Foerderung eines Deutschen Forschungsnetzes e. V.	15,461	0.12	15,295	0.12	-1.14
QuoVadis Limited	14,597	0.12	14,879	0.12	-4.05
SH	13,791	0.11	13,300	0.11	1.41
Default Company Ltd	13,298	0.11	12,612	0.10	3.12
World4You Internet Services GmbH	12,914	0.10	12,542	0.10	0.70
DOMENY.PL sp. z o.o	10,008	0.08	9,806	0.08	-0.18
Test Self SSL Company	9,975	0.08	9,632	0.08	1.28
KAGOYA-JAPAN	9,003	0.07	8,808	0.07	-0.03
Unspecified	8,854	0.07	8,236	0.07	5.14
CloudFlare, Inc.	8,838	0.07	8,788	0.07	-1.64
Corporation Service Company	8,628	0.07	9,728	0.08	-13.26
ZeroSSL	8,233	0.07	7,906	0.06	1.85
Trust Provider B.V.	8,198	0.06	8,092	0.07	-0.92
www.sprinthost.ru	7,963	0.06	7,710	0.06	1.01
ddos-guard	7,492	0.06	6,930	0.06	5.73
Basekit Ltd	7,320	0.06	6,731	0.05	6.36
XX	6,484	0.05	6,226	0.05	1.85
o2switch	6,474	0.05	5,877	0.05	7.74
Dreamcommerce S.A.	5,517	0.04	5,459	0.04	-1.16
Caddy Self-Signed	5,371	0.04	5,564	0.05	-5.59
Alpiro s.r.o.	5,301	0.04	5,327	0.04	-2.68
testexample	5,238	0.04	3,547	0.03	44.43
TAIWAN-CA	5,117	0.04	5,029	0.04	-0.49
dhosting.pl Sp. z o.o.	4,880	0.04	4,660	0.04	2.42
T-Systems International GmbH	4,779	0.04	4,694	0.04	-0.43
SSL Corporation	4,665	0.04	4,609	0.04	-1.01
Mirohost	4,463	0.04	4,433	0.04	-1.54
Buypass AS-983163327	4,349	0.03	3,908	0.03	8.84
WEDOS Internet, a.s.	4,335	0.03	10,298	0.08	-58.83
nazwa.pl sp. z o.o.	4,205	0.03	3,984	0.03	3.23
GMO CLOUD K.K.	4,172	0.03	4,053	0.03	0.67
SwissSign AG	3,903	0.03	3,961	0.03	-3.63
DealerInspire	3,793	0.03	3,725	0.03	-0.41
CentOS Web Panel	3,781	0.03	3,611	0.03	2.41
QuoVadis Trustlink B.V.	3,692	0.03	3,654	0.03	-1.18
GeoTrust, Inc.	3,524	0.03	3,626	0.03	-4.95
thawte, Inc.	3,384	0.03	3,588	0.03	-7.76
HydrantID (Avalanche Cloud Corporation)	3,372	0.03	3,324	0.03	-0.79
Beijing Knownsec Information Technology Co., Ltd	3,317	0.03	3,033	0.02	6.96
Bitrix	3,314	0.03	3,135	0.03	3.39
NetLock Kft.	3,260	0.03	3,243	0.03	-1.69
WoTrus CA Limited	3,201	0.03	3,084	0.02	1.51
The Trustico Group Ltd	3,143	0.02	3,054	0.02	0.65
N/A	3,049	0.02	3,005	0.02	-0.77
Guardian Inc.	2,950	0.02	2,906	0.02	-0.72
SSL Server	2,939	0.02	2,915	0.02	-1.39
ONEsolution s.r.o.	2,934	0.02	2,851	0.02	0.65
Digital Element	2,689	0.02	2,688	0.02	-2.16
FASTVPS	2,669	0.02	2,595	0.02	0.59
Fasthosts Internet Limited	2,459	0.02	2,516	0.02	-4.41
AttHost Sp z o.o.	2,437	0.02	2,358	0.02	1.08
unaone	2,423	0.02	2,437	0.02	-2.76
MyCompany	2,380	0.02	2,384	0.02	-2.36
DivMulTech LLC	2,370	0.02	2,350	0.02	-1.37
EUNETIC GmbH	2,303	0.02	0	0.00	N/A
SpinupWP	2,254	0.02	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.