Hoang Mai Stone Joint Stock Company is a Vietnam-based infrastructure materials and civil engineering enterprise specializing in stone quarrying, concrete products manufacturing, and transport infrastructure construction. The company operates primarily across three core business segments: Stone Mining and Processing, Concrete Products Manufacturing, and Construction Contracting. Its product and service portfolio comprises quarrying and processing of crushed stone, including railway track ballast, construction aggregates, and industrial stone materials; manufacturing of prestressed reinforced concrete railway sleepers, switch ties, turnout sleepers, and custom precast concrete structural components; and contracting services covering railway track laying, track rehabilitation, bridge and station modernization, and road infrastructure development. Hoang Mai Stone Joint Stock Company primarily supplies railway management entities under the national rail network, transport infrastructure contractors, and commercial construction projects across Vietnam, utilizing production assets strategically located along National Highway 1A and the North-South railway corridor. Founded in 1969 as Hoang Mai Quarry and headquartered in Hoang Mai Town, Nghe An Province, Vietnam, the company trades on the Hanoi Stock Exchange under the ticker HMR and operates as an affiliate of Railway Construction Joint Stock Corporation (RCC). In recent developments, parent entity RCC initiated a capital restructuring program to divest a 23.2% equity stake representing 1.3 million HMR shares to optimize asset allocation, while Hoang Mai Stone Joint Stock Company continues to expand production capacity and technological standards to support major national railway renovation and urban transit development contracts.