Samsung, Hynix, Infineon, NEC, Hitachi, Mitsubishi, Toshiba, Elpida and Nanya have been fined for price-fixing in the market.
Micron was also involved in the illegal practise but escaped without punishment since it was the company that alerted the authorities.
Samsung and Infineon received the biggest fines for their roles in the price-fixing affair that has been under investigation since 2002.
The EU’s Competition Commissioner, Joaquin Almunia, said: “By acknowledging their participation in a cartel the companies have allowed the Commission to bring this long-running investigation to a close and to free up resources to investigate other suspected cartels.”
He added that future cases should be concluded more speedily.
“As the procedure is applied to new cases it is expected to speed up investigations significantly.”