The company was founded in 1988 by Timothy J. Klein and David A. Snell, and is headquartered in Amherst, New York.

[2] In 1992, ATTO introduced the ISA, EISA and Micro Channel (MCA) host bus adapters for the PC market at the COMDEX trade show.

By 1995, ATTO added to its product line with the introduction of the ExpressPCI SCSI-3 Accelerator, which received the MacUsers Editor's Choice award that year.

The following year, 2016, was a banner year for ATTO, introducing both 32 GB and 16 GB Gen 6 Celerity host bus adapters and debuted the renamed XstreamCORE storage controller, replacing all but a few of its Fibre Channel storage controllers.

These features combine to provide very high, reliable throughput and IOPS with deterministic latency of under 4 microseconds.

Unlike general purpose processor based architectures xCORE maintains performance and latency as services and features are added.

The eCORE Control Engine also manages traffic for data mover offload with added error handling and diagnostic tools.