Description Sigma Capital Group is an asset management and venture capital firm that invests in development-stage high-tech and sustainable energy companies and real estate. Its portfolio includes interests in about 20 firms. Portfolio holdings include wind turbine manufacturer Ampair Energy, health care software developer Extramed, and e-mail response management system designer Logicalware. Through Sigma Property Investment Management (SigmaPIM), the company manages assets and portfolios of real estate for third-party investors; it has some £200 million under management.