Two of Mexico's most influential business groups are proposing new efforts to stem corporate corruption.

The heads of the Mexican Business Council and the Business Coordinating Council say they will promote new accountability measures. Their members include corporations such as Coca-Cola and the airline Aeromexico.

This is as the Mexico City-based think tanks Mexicans Against Corruption and Mexican Transparency issued a report this week saying only about a third of Mexico's 500 biggest companies follow anti-corruption protocols.

Eduardo Bohórquez, head of Mexican Transparency, said previous anti-corruption initiatives have failed.

Bohórquez pointed to the case of the state-owened oil company Pemex, which has be mired in corruption scandals for decades. Most recently, the leader of the oils worker's union, Carlos Romero Deschamps, resigned amid an investigation by the country's attorney general into Romero Deschmaps' unexplained wealth.

"Pemex has all the seals of approval that exist, but the company hasn't changed," Bohórquez said in a news conference in Mexico City.

Bohórquez is proposing an alliance across Mexico's corporate sector to increase accountability.