Report Description

1. In some cases CAs require you to agree to licensing terms before accessing their public keys. Any root public key not freely available is not included in this report, and the associated certificates signed by the key will be in the "Other" category.
2. Some of the root public keys are inaccessible for other reasons, or may have simply not been included in our survey.
3. This report limits itself to the top 7 verified root keys for reporting purposes (with the exception of self signed certificates, that are all grouped together in a single category).

An alternative view of the CA market can be seen in our newer CA Market Share report which does not rely on certificate chain validation, and reports on the top 100 CAs known.

Across All Domains

Certificate Authority¹ Market Share Change (Total servers: 315,944 )

Authority2	April Count	April %	March Count	March %	Change
GeoTrust	65,227	20.65%	63,328	20.47%	+0.18%
Thawte	39,167	12.40%	38,533	12.45%	-0.05%
Self Signed	26,786	8.48%	26,497	8.56%	-0.08%
Verisign	24,170	7.65%	25,137	8.12%	-0.47%
Starfield	14,078	4.46%	14,482	4.68%	-0.22%
Comodo	11,083	3.51%	11,997	3.88%	-0.37%
Entrust.net	3,665	1.16%	3,798	1.23%	-0.07%
Other	131,768	41.71%	125,647	40.61%	+1.10%

¹Visit our alternative CA Market Share report for a view of CAs not covered here.
²Certificate Authorities are ordered according to their global market share.