The story
GlobalSign was founded in Belgium in 1996 and acquired in 2007 by GMO group in Japan (formerly GeoTrust Japan).
In September 2011, as a precaution, GlobalSign suspended issuing authentication certificates temporarily after an anonymous hacker going by the name "ComodoHacker" claimed to have compromised their servers, as well as those of other certificate authorities. The company took the claim seriously enough to halt the signing/issuing of new certificates while investigating the claims; it resumed issuing certificates a week later. Dutch security company Fox-IT was contracted to analyze the breach and GlobalSign released a security incident report. On December 13, 2011 GlobalSign released its final report on the incident.
The report concluded that while GlobalSign's own web server was breached and the certificate of this server was stolen, due to the air gap separating this web server from the certificate-issuing machine (the one holding the company's root certificate), there was no evidence of any rogue certificates issued or any customer data exposed, thus the remedial actions were limited to cancelling their own web server's certificate and patching its software. Sophos's Chester Wisniewski summarized the report and GlobalSign's response to the incident on his blog and concluded "Not only is the report thorough and convincing, but it appears that GlobalSign took every action, exactly as they should have, both during and after the incident."
As of January 2015, Globalsign was the 4th largest certificate authority in the world according to the Netcraft survey. GlobalSign was the first CA to improve revocation checking for HTTPS pages through the use of a CDN, and the company was also the first to offer IPv6 compliant revocation services ("CRL").
In 2018, GlobalSign became a Qualified Trust Service Provider (QTSP) under the eIDAS regulation in both the European Union and the United Kingdom. In 2021, after the UK left the EU, GlobalSign was approved as the UK's first QTSP.
From Wikipedia’s article on GlobalSign, shared under CC BY-SA 4.0.4