The amount of the deal was not disclosed.
The company will use the funds for future organic and inorganic growth initiatives.
Founded in 2007 by Jonathan Haigh and led by CEO Craig Bennett, Sigma Retail Solutions offers a wide range of services from procurement to project delivery and supply chain solutions of various specialist fixtures and fittings.
The company serves some of the leading global retailers including large format food retailers, pharmaceuticals, fashion and high street brands.
It has more than 230 employees worldwide and over £50m revenues.