- May 1973: Establishment of Quang Tri Grocery & Foodstuff Agency
- 1974: Upgrading into Quang Tri Grocery & Foodstuff Company
- 1977: Establishment of Dong Ha Trade Company
- 1992: Establishment of Quang Tri General Trade Company
- January 1993: Emerging the two companies: Dong Ha Trade Company and Quang Tri General Trade Company, establishment of Trading Company of Quang Tri
- April 1995: Establishment of Branch of Quang Tri Trading One Member Limited Company in Ho Chi Minh City
- November 1999: Establishment of Branch of Trading Company of Quang Tri in Lao Bao Special Commercial Economic Zone
- December 2003: Establishment of Branch of Quang Tri Trading One Member Limited Company - Viet Lao Trade Enterprise
- March 2004: Establishment of Branch of Quang Tri Trading One Member Limited Company - Huong Hoa Tapioca Starch Factory
- 21st March 2004: Successful manufacture of tapioca starch product with SEPON brand
- July 2004: Establishment of Branch of Quang Tri Trading One Member Limited Company - SEPON Hotel
- June 2006: Establishment of Branch of Quang Tri Trading One Member Limited Company - SEPON Travel Agency
- October 2006: Changing into Quang Tri Trading One Member Limited Company
July 2008: Established Atuc Trade Center
September 2008: Established Hung Vuong Trade and Service Center
2009: Built Lang Vay Service Center
February 2009: Established Quang Tri Trading One-Member LLC Branch in An Giang
April 2009: Established Sepon Travel Joint Stock Company
March 2010: Established the Agricultural Experiment and Technology Transfer Center
December 2010: Inaugurated Dong Ha Coopmart Supermarket – a joint venture between Quang Tri Trading One-Member LLC and Saigon Co.op (HCMC Cooperative Alliance for Trade)
April 27, 2011: Established Quang Tri Trading One-Member LLC Branch – Dong Ha Agricultural Processing Plant
February 21, 2012: Established Global Import-Export Branch under Quang Tri Trading One-Member LLC
August 6, 2012: Established Quang Tri Trading One-Member LLC Branch – Cam Lo Rubber Processing Plant
August 25, 2012: Successfully produced Sepon-branded rubber products
May 17, 2014: Established Quang Tri Trading One-Member LLC Branch – Cam Lo Biomass Pellet Plant
December 2014: Converted Quang Tri Trading One-Member LLC into Quang Tri Trading Corporation (Joint Stock Company)
April 1, 2015: Established Quang Tri Trading Corporation Branch – Cua Viet Tourism Service Center
November 16, 2016: Approved by the State Securities Commission as a Public Company
February 6, 2017: Company’s shares officially traded on Vietnam Stock Exchange under ticker: SEP
April 16, 2024: Established Sepon Rice Drying Plant
June 1, 2024: Established Sepon Organic Fertilizer Plant