Founded in 2006, Atlantis raised $10m in August 2010 and a further $5m from angels.
Atlantis Computing, a US-based online software and data centre services provider, has raised $20m in its series D round from a consortium including technology network equipment maker Cisco Systems.
Private equity firm Adams Street Partners and venture capital peers El Dorado Ventures and Partech International joined Cisco in the D round.
Founded in 2006, Atlantis raised $10m in August 2010 and a further $5m from angels.