Highstar Capital is a private equity firm specializing in infrastructure related assets and businesses and service providers in the energy, pipeline construction, environmental services, transportation, waste management, and water sectors. The firm does not invest in low-growth, annuity-like assets such as toll roads, social infrastructure or government sale-lease back arrangements. In transportation, it seeks to invest in the expansion and renovation of transportation infrastructure including ports, terminal and inter modal operations, surface transportation, logistic companies, and other service providers to the transportation sectors.