• 1974 A family-owned company, PET HOLDING was founded in 1974 under the name of PET TİCARET BÜROSU (PET Bureau of Commerce) by H. Güntekin KÖKSAL as a sole proprietorship, with the aim of taking part in the trade business as an agency, consultancy and insurance firm.
  
• 1979 PET MÜHENDİSLİK MÜŞAVİRLİK MÜMESSİLLİK LİMİTED ŞİRKETİ (PET ENGINEERING, CONSULTANTS & REPRESENTATION LTD. CO.) was founded. (This company became INCORPORATED in 1988.) 
  
• 1979 PET-KONTUR KONUT İNŞAAT VE TURİZM LİMİTED ŞİRKETİ (PET-KONTUR CONSTRUCTION & TOURISM LTD. CO.) was founded to carry out construction and contracting services. (This company became INCORPORATED in 1988.)
  
• 1979 GÖZETİM EKSPERTİZ SERVİS LİMİTED ŞİRKETİ (GÖZETİM SPECIALIZED SERVICING LTD CO.) was founded with the aim of complementing and supporting the activities of the existing companies. (From 1981 on it has continued working under the name of PET-MADENCİLİK İMALAT LİMİTED ŞİRKETİ (PET MINING & PRODUCTION LTD. CO.).)
  
• 1979 PETKÖK GIDA MADEN VE SANAYİ ÜRÜNLERİ İHRACAT İTHALAT VE PAZARLAMA LİMİTED ŞİRKETİ (PETKÖK FOOD, MINING, & INDUSTRIAL PRODUCTS IMPORT, EXPORT & SALES LTD. CO.) was founded. (In 1986 it became PETMER MADEN ÜRÜNLERİ SANAYİ VE TİCARET LİMİTED ŞİRKETİ (PETMER MINING PRODUCTS INDUSTRY & TRADE LTD. CO.). In 1992 its name became PET DEMİR ÇELİK SANAYİ VE TİCARET ANONİM ŞİRKETİ (PET IRON & STEEL INDUSTRIES AND TRADE INC.) and it has been continuing its commercial activities under this name.)
  
• 1981 PET HOLDINGS INCORPORATED was founded.
  
• 1981 PET BOYA VERNİK SENTETİK REÇİNE SANAYİ LİMİTED ŞİRKETİ (PET PAINT, VARNISH & SYNTHETIC RESIN INDUSTRIES LTD. CO.) was founded. (After 1992 it continued under the name PET TRANS ULUSLARARASI NAKLİYAT VE TİCARET ANONİM ŞİRKETİ (PET TRANS INTERNATIONAL TRANSPORTATION & TRADE INC.)

History...