Sentry.co – Sold yesterday on Triad Domains for a whopping $24,450 USD, the domain name is under privacy at present so I am unsure who has acquired it.
Sentry Insurance owns Sentry.com & Sentry.io is operated by an application monitoring company that has raised over $127 Million USD in funding, could either of them be the new owner of Sentry.co, time will tell but congratulations to the buyer and sell of this domain name.
Another possibility could Marvel have bought it? – Sentry (Robert “Bob” Reynolds) is a fictional character appearing in American comic books published by Marvel Comics. The character first appears in The Sentry #1 (September 2000) and was created by Paul Jenkins and Jae Lee with uncredited conceptual contributions by Rick Veitch.