The companies are being investigated by the CFC over alleged price-fixing, which the commission assures has been occurring since 1982.
On May 28, CFC notified the companies they had five working days to comply with the requirement, which is based on article 31 of federal economic competition law LFCE.
Cemex would be fined 20mn pesos (US$1.55m) if found guilty of collusion, but on May 20 CFC president Eduardo Pérez Motta said this penalty was too low.
