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Certificate Authority Market Share Report
May 1st, 2021

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 Encrypt3,161,90525.053,070,39924.870.72
Sectigo Limited2,467,09919.542,405,62619.490.30
DigiCert1,613,96312.791,599,05312.95-1.29
cPanel, Inc.767,2756.08748,2526.060.29
GlobalSign nv-sa570,2974.52559,9214.54-0.39
Unknown482,4663.82464,2723.761.63
GoDaddy.com, Inc.411,8413.26408,6663.31-1.44
Unizeto Technologies S.A.263,3362.09258,2092.09-0.26
Amazon246,9361.96240,3431.950.48
Starfield Technologies, Inc.230,3871.83224,6071.820.32
Cloudflare, Inc.214,2571.70207,3631.681.05
COMODO CA Limited170,7881.35175,3191.42-4.73
SecureCore130,7721.04127,1591.030.58
Plesk109,8390.87107,1080.870.29
Gehirn Inc.99,9440.7997,7320.790.01
SomeOrganization97,7830.7792,6260.753.25
none94,9970.7592,4970.750.44
Google Trust Services90,8940.7290,3440.73-1.60
DreamHost76,9410.6173,3290.592.62
ispgateway70,7080.5670,0640.57-1.30
Microsoft Corporation62,4720.4962,0120.50-1.47
Internet254,3210.4353,8150.44-1.28
home.pl S.A.45,8300.3644,6560.360.37
Actalis S.p.A.44,0880.3542,9590.350.37
GoGetSSL43,9370.3542,0450.342.20
Gandi37,6050.3036,4350.300.94
Entrust, Inc.36,6810.2936,7850.30-2.48
Parallels36,2620.2935,9650.29-1.39
GEANT Vereniging36,0410.2933,9710.283.76
TrustAsia Technologies, Inc.33,7680.2732,7150.260.95
Webhosting32,7690.2632,0390.260.03
Trustwave Holdings, Inc.30,8360.2430,7690.25-1.99
Odin30,4380.2430,4750.25-2.32
TERENA27,0010.2128,9270.23-8.71
GeoTrust Inc.24,6530.2024,7710.20-2.66
Japan Registry Services Co., Ltd.24,2760.1923,8530.19-0.46
Cybertrust Japan Co., Ltd.22,5950.1822,3720.18-1.22
SECOM Trust Systems CO.,LTD.19,7190.1617,4060.1410.80
Internet Widgits Pty Ltd18,6160.1517,9500.151.43
Acme Co18,2470.1417,5230.141.84
Apache HTTP Server16,4700.1316,4430.13-2.04
WebSupport, s.r.o.15,7410.1215,5040.13-0.70
Soluciones Corporativas IP, SL15,5800.1214,7580.123.25
Network Solutions L.L.C.15,5560.1214,8610.122.37
Verein zur Foerderung eines Deutschen Forschungsnetzes e. V.15,4610.1215,2950.12-1.14
QuoVadis Limited14,5970.1214,8790.12-4.05
SH13,7910.1113,3000.111.41
Default Company Ltd13,2980.1112,6120.103.12
World4You Internet Services GmbH12,9140.1012,5420.100.70
DOMENY.PL sp. z o.o10,0080.089,8060.08-0.18
Test Self SSL Company9,9750.089,6320.081.28
KAGOYA-JAPAN9,0030.078,8080.07-0.03
Unspecified8,8540.078,2360.075.14
CloudFlare, Inc.8,8380.078,7880.07-1.64
Corporation Service Company8,6280.079,7280.08-13.26
ZeroSSL8,2330.077,9060.061.85
Trust Provider B.V.8,1980.068,0920.07-0.92
www.sprinthost.ru7,9630.067,7100.061.01
ddos-guard7,4920.066,9300.065.73
Basekit Ltd7,3200.066,7310.056.36
XX6,4840.056,2260.051.85
o2switch6,4740.055,8770.057.74
Dreamcommerce S.A.5,5170.045,4590.04-1.16
Caddy Self-Signed5,3710.045,5640.05-5.59
Alpiro s.r.o.5,3010.045,3270.04-2.68
testexample5,2380.043,5470.0344.43
TAIWAN-CA5,1170.045,0290.04-0.49
dhosting.pl Sp. z o.o.4,8800.044,6600.042.42
T-Systems International GmbH4,7790.044,6940.04-0.43
SSL Corporation4,6650.044,6090.04-1.01
Mirohost4,4630.044,4330.04-1.54
Buypass AS-9831633274,3490.033,9080.038.84
WEDOS Internet, a.s.4,3350.0310,2980.08-58.83
nazwa.pl sp. z o.o.4,2050.033,9840.033.23
GMO CLOUD K.K.4,1720.034,0530.030.67
SwissSign AG3,9030.033,9610.03-3.63
DealerInspire3,7930.033,7250.03-0.41
CentOS Web Panel3,7810.033,6110.032.41
QuoVadis Trustlink B.V.3,6920.033,6540.03-1.18
GeoTrust, Inc.3,5240.033,6260.03-4.95
thawte, Inc.3,3840.033,5880.03-7.76
HydrantID (Avalanche Cloud Corporation)3,3720.033,3240.03-0.79
Beijing Knownsec Information Technology Co., Ltd3,3170.033,0330.026.96
Bitrix3,3140.033,1350.033.39
NetLock Kft.3,2600.033,2430.03-1.69
WoTrus CA Limited3,2010.033,0840.021.51
The Trustico Group Ltd3,1430.023,0540.020.65
N/A3,0490.023,0050.02-0.77
Guardian Inc.2,9500.022,9060.02-0.72
SSL Server2,9390.022,9150.02-1.39
ONEsolution s.r.o.2,9340.022,8510.020.65
Digital Element2,6890.022,6880.02-2.16
FASTVPS2,6690.022,5950.020.59
Fasthosts Internet Limited2,4590.022,5160.02-4.41
AttHost Sp z o.o.2,4370.022,3580.021.08
unaone2,4230.022,4370.02-2.76
MyCompany2,3800.022,3840.02-2.36
DivMulTech LLC2,3700.022,3500.02-1.37
EUNETIC GmbH2,3030.0200.00N/A
SpinupWP2,2540.0200.00N/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.



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