- Heavy construction (civil and industrial infrastructure, mechanical engineering, road & railways construction, irrigation works, hydropower plants and transmission & transformer stations)

- Mechanical products manufacturing (mechanical equipment such as pipe bearing pile).

- July 20, 1960: Formerly known as Mechanical inter-station at Thac Ba Hydroelectric Plant, was established.

- March 26, 1993: Song Da 9 Company, was established under the Decision No.128A BXD/TCLD of Minister of Construction.

- November 18, 2005: Equitized and renamed as Song Da 9 Joint Stock Company.

- January 04, 2006: Officially operated as a Joint Stock Company with the initial charter capital of VND70 billion.

- December 20, 2006: Traded on Hanoi Stock Exchange (HNX).

- 2007: Increased charter capital to VND150 billion.

- 2010: Increased charter capital to VND292.5 billion.

- 2014: Increased charter capital to VND305.6 billion.

- 2016: Increased charter capital to VND342.3 billion.