The "KONLHEK MINI MARATHON" charity walk-run event was first held in 2008, initiated by Sahaviriya Steel Industries Public Company Limited (SSI), under the event name SSI Mini Marathon 2008: Strength to Live, on September 6, 2008, at Lumpini Park. It began as a volunteer-driven activity by SSI employees, receiving strong support from staff, executives, customers, financial institutions, and the general public. In 2009, the event was officially renamed “Khon Lek Mini Marathon” and has continued under this name to the present day.
This year, Sahaviriya Steel Industries PCL (SSI), together with leading Thai steel industry partners, is organizing the event on Sunday, October 5, 2025, at Vachirabenjatas Park (Rot Fai Park), Bangkok. Participating companies include: Thai Cold Rolled Steel Sheet PCL (TCRSS) , NS BlueScope (Thailand) Ltd., NS-Siam United Steel Co., Ltd. (NS-SUS), JFE Steel Galvanizing (Thailand) Ltd. (JSGT), G Steel PCL, G J Steel PCL