Saint-Gobain, the French parent company of builders merchants chain Jewson, has been fined €896m (£738m) for acting in a cartel to illegally fix the price of glass used in cars.
The fine is the largest ever levied by the European Commission on a single company for cartel offences.
The British company Pilkington was also fined €370m (£307m) for its role in the cartel, which fixed prices in glass used in the automotive industry.