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	March 2021 Count	March 2021 %	February 2021 Count	February 2021 %	Growth %
Let's Encrypt	3,070,399	24.87	2,970,259	24.55	1.29
Sectigo Limited	2,405,626	19.49	2,332,841	19.28	1.05
DigiCert	1,599,053	12.95	1,576,277	13.03	-0.60
cPanel, Inc.	748,252	6.06	728,793	6.02	0.61
GlobalSign nv-sa	559,921	4.54	573,071	4.74	-4.26
Unknown	464,272	3.76	451,130	3.73	0.84
GoDaddy.com, Inc.	408,666	3.31	408,692	3.38	-2.02
Unizeto Technologies S.A.	258,209	2.09	238,345	1.97	6.16
Amazon	240,343	1.95	241,245	1.99	-2.38
Starfield Technologies, Inc.	224,607	1.82	219,347	1.81	0.34
Cloudflare, Inc.	207,363	1.68	199,238	1.65	1.98
COMODO CA Limited	175,319	1.42	207,576	1.72	-17.24
SecureCore	127,159	1.03	122,944	1.02	1.35
Plesk	107,108	0.87	105,787	0.87	-0.79
Gehirn Inc.	97,732	0.79	94,739	0.78	1.08
SomeOrganization	92,626	0.75	91,951	0.76	-1.29
none	92,497	0.75	89,500	0.74	1.27
Google Trust Services	90,344	0.73	89,105	0.74	-0.65
DreamHost	73,329	0.59	68,485	0.57	4.92
ispgateway	70,064	0.57	69,197	0.57	-0.78
Microsoft Corporation	62,012	0.50	60,562	0.50	0.33
Internet2	53,815	0.44	53,806	0.44	-1.99
home.pl S.A.	44,656	0.36	43,581	0.36	0.41
Actalis S.p.A.	42,959	0.35	41,709	0.34	0.93
GoGetSSL	42,045	0.34	40,679	0.34	1.28
Entrust, Inc.	36,785	0.30	37,225	0.31	-3.17
Gandi	36,435	0.30	36,649	0.30	-2.58
Parallels	35,965	0.29	36,602	0.30	-3.72
GEANT Vereniging	33,971	0.28	28,945	0.24	15.00
TrustAsia Technologies, Inc.	32,715	0.26	31,178	0.26	2.82
Webhosting	32,039	0.26	31,009	0.26	1.24
Trustwave Holdings, Inc.	30,769	0.25	30,716	0.25	-1.84
Odin	30,475	0.25	37,335	0.31	-20.02
TERENA	28,927	0.23	32,524	0.27	-12.85
GeoTrust Inc.	24,771	0.20	24,635	0.20	-1.47
Japan Registry Services Co., Ltd.	23,853	0.19	23,360	0.19	0.06
Cybertrust Japan Co., Ltd.	22,372	0.18	19,497	0.16	12.44
Internet Widgits Pty Ltd	17,950	0.15	17,711	0.15	-0.69
Acme Co	17,523	0.14	17,170	0.14	0.00
SECOM Trust Systems CO.,LTD.	17,406	0.14	16,558	0.14	3.01
Apache HTTP Server	16,443	0.13	16,411	0.14	-1.82
WebSupport, s.r.o.	15,504	0.13	15,175	0.13	0.11
Verein zur Foerderung eines Deutschen Forschungsnetzes e. V.	15,295	0.12	15,166	0.13	-1.18
QuoVadis Limited	14,879	0.12	15,009	0.12	-2.86
Network Solutions L.L.C.	14,861	0.12	15,342	0.13	-5.08
Soluciones Corporativas IP, SL	14,758	0.12	14,268	0.12	1.35
SH	13,300	0.11	12,919	0.11	0.88
Default Company Ltd	12,612	0.10	12,828	0.11	-3.66
World4You Internet Services GmbH	12,542	0.10	12,126	0.10	1.35
WEDOS Internet, a.s.	10,298	0.08	11,791	0.10	-14.42
DOMENY.PL sp. z o.o	9,806	0.08	9,612	0.08	-0.03
Corporation Service Company	9,728	0.08	9,567	0.08	-0.36
Test Self SSL Company	9,632	0.08	9,188	0.08	2.72
KAGOYA-JAPAN	8,808	0.07	8,629	0.07	0.02
CloudFlare, Inc.	8,788	0.07	5,753	0.05	49.68
Unspecified	8,236	0.07	7,501	0.06	7.59
Trust Provider B.V.	8,092	0.07	12,750	0.11	-37.81
ZeroSSL	7,906	0.06	7,883	0.07	-1.73
www.sprinthost.ru	7,710	0.06	7,455	0.06	1.34
ddos-guard	6,930	0.06	6,982	0.06	-2.74
Basekit Ltd	6,731	0.05	5,838	0.05	12.98
XX	6,226	0.05	5,834	0.05	4.57
o2switch	5,877	0.05	5,583	0.05	3.15
Caddy Self-Signed	5,564	0.05	5,573	0.05	-2.17
Dreamcommerce S.A.	5,459	0.04	5,341	0.04	0.15
Alpiro s.r.o.	5,327	0.04	0	0.00	N/A
TAIWAN-CA	5,029	0.04	4,877	0.04	1.04
T-Systems International GmbH	4,694	0.04	4,608	0.04	-0.18
dhosting.pl Sp. z o.o.	4,660	0.04	4,503	0.04	1.41
SSL Corporation	4,609	0.04	4,443	0.04	1.65
Mirohost	4,433	0.04	4,377	0.04	-0.76
GMO CLOUD K.K.	4,053	0.03	3,911	0.03	1.55
nazwa.pl sp. z o.o.	3,984	0.03	3,986	0.03	-2.06
SwissSign AG	3,961	0.03	3,976	0.03	-2.38
Buypass AS-983163327	3,908	0.03	3,923	0.03	-2.39
DealerInspire	3,725	0.03	3,580	0.03	1.96
QuoVadis Trustlink B.V.	3,654	0.03	3,543	0.03	1.06
GeoTrust, Inc.	3,626	0.03	3,582	0.03	-0.81
CentOS Web Panel	3,611	0.03	3,581	0.03	-1.19
thawte, Inc.	3,588	0.03	3,623	0.03	-2.96
testexample	3,547	0.03	3,171	0.03	9.61
HydrantID (Avalanche Cloud Corporation)	3,324	0.03	3,553	0.03	-8.33
NetLock Kft.	3,243	0.03	2,419	0.02	31.37
Bitrix	3,135	0.03	2,974	0.02	3.29
WoTrus CA Limited	3,084	0.02	2,978	0.02	1.48
The Trustico Group Ltd	3,054	0.02	6,499	0.05	-53.95
Beijing Knownsec Information Technology Co., Ltd	3,033	0.02	2,731	0.02	8.82
N/A	3,005	0.02	3,012	0.02	-2.24
National Institute of Informatics	2,960	0.02	3,497	0.03	-17.06
SSL Server	2,915	0.02	2,883	0.02	-0.92
Guardian Inc.	2,906	0.02	2,858	0.02	-0.37
ONEsolution s.r.o.	2,851	0.02	2,776	0.02	0.64
Digital Element	2,688	0.02	2,688	0.02	-2.01
FASTVPS	2,595	0.02	2,505	0.02	1.51
Fasthosts Internet Limited	2,516	0.02	2,428	0.02	1.54
unaone	2,437	0.02	2,443	0.02	-2.25
MyCompany	2,384	0.02	2,378	0.02	-1.76
AttHost Sp z o.o.	2,358	0.02	2,246	0.02	2.88
DivMulTech LLC	2,350	0.02	2,306	0.02	-0.14
Comodo Limited	2,271	0.02	2,316	0.02	-3.92

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.