Exa Corporation was a developer and distributor of computer-aided engineering (CAE) software.

Its main product was PowerFLOW, a lattice-boltzmann derived implementation of computational fluid dynamics (CFD), which can very accurately simulate internal and external flows in low-Mach regimes.

On November 17, 2017, Dassault Systèmes completed acquisition of Exa Corporation.

[4] On September 28, 2017, Dassault Systèmes announced the signing of a definitive merger agreement to acquire Exa, valuing the company at about 400 million USD.

[4] Exa reported $61.4 million in total revenue for the full year fiscal 2015.