Each month SecuritySpace (www.securityspace.com) publishes the market share of each CA. Figures are obtained by examining a sample of over 100,000 domain names actively using SSL certificates.

The following chart summarizes the market share of the top 2 enterprise players in the .net market, namely Verisign and GeoTrust. The chart also shows the market share of Thawte (Thawte is a Verisign company).

worldwide_ssl_market_share