The Competition Board concluded the preliminary inquiry conducted on Bilal Ensar İnşaat Mad. Enerji Nak. San. ve Tic. Ltd. Şti. (ENSAR), Maruf OYSAL-Uğur Beton (UĞUR), Tarlak Yapı İnş. Mad. San. AŞ (TARLAK) and Tekyol Beton San Tic. Ltd. Şti. (TEKYOL), operating in the ready-mix concrete sector in the Siirt Province, concerning the claim that the relevant undertakings violated Article 4 of the Act no 4054 on the Protection of Competition (Act no 4054) by colluding to fix sale prices of ready-mix concrete and by maintaining supply amounts.

After examining the information and documents acquired and the observations made during the preliminary inquiry in its meeting of 28.08.2025, with the decision no 25-32/754-M, the Competition Board ruled that the findings were significant and sufficient, and launched an investigation, under Article 41 of the Act no 4054, to determine if Article 4 of the Act no 4054 was violated  

• by ENSAR, TARLAK, TEKYOL and UĞUR through fixing sale prices of ready-mix concrete and controlling the supply of ready-mix concrete,
• by ENSAR, TEKYOL and UĞUR through fixing sale prices of aggregate and controlling the supply of aggregate,
• by ENSAR, TEKYOL, UĞUR and TARLAK though their practices involving fixing staff wages and non-poaching agreements,  

* Investigation decisions taken by the Competition Board are announced to the public following the notification of the decision to the undertakings or associations of undertakings under investigation. These declarations, which are made within the framework of informing the public on Competition Board decisions, cannot be interpreted to mean that the undertakings or associations of undertakings under investigation have violated the Act no 4054 and that they have faced or will face sanctions under the Act.