Sigma.me is tracked by us since April, 2011. Over the time it has been ranked as high as 738 899 in the world, while most of its traffic comes from China, where it reached as high as 49 116 position. It was owned by several entities, from df Liu to REDACTED FOR PRIVACY of Domains By Proxy LLC, it was hosted by Columbia University, ALICLOUD-US and others. While doMEn was its first registrar, now it is moved to .

Sigma has a decent Google pagerank and bad results in terms of Yandex topical citation index. We found that Sigma.me is poorly ‘socialized’ in respect to any social network. According to MyWot and Google safe browsing analytics, Sigma.me is quite a safe domain with no visitor reviews.