Prior to 2022, Stratus Technologies, Inc. was a privately held company, owned solely by Siris Capital Group.

Starting in 1983, its computers were resold worldwide by Stratus' own sales force as well as partners such as Olivetti under the CPS/32 ("Continuous Processing System") brand.

23 engineers, mostly from the MIT Multics project and Data General, produced their initial product in just 21 months, and delivered it to a local company, the West Lynn Creamery.

In the second quarter of 2002, Lucent sold the telecom product lines that originally came from Stratus to Platinum Equity, a buyout firm based in Los Angeles.

[citation needed] In 2012, Stratus acquired the assets, products, services, and intellectual property of Marathon Technologies along with its customer base and channel-partner network.

In June 2002, Stratus introduced the ftServer line of Intel-based servers, running Microsoft Windows 2000 and higher.

The Stratus ftServer line sold today supports Windows Server, VMware vSphere, and Red Hat Enterprise Linux.

The company began offering Stratus Avance software in June 2008, a high availability product with virtualization built in.

The two servers comprising the Avance high-availability platform may be separated by up to three miles for purposes of disaster recovery and business continuity.

Avance is intended to serve small-to-medium size businesses' need for affordable and simple high availability and virtualization.

Stratus has a large presence in Maynard, Massachusetts, its U.S. headquarters, and in Phoenix, Arizona, as well as several worldwide offices, in locations such as the UK, the Netherlands, South Africa, France, Germany, Italy, Spain, Australia, New Zealand, Singapore, Hong Kong, China, Japan and India.