The companies are accused of reducing the quantity of supply despite the available capacity so as to raise prices.
India sees a huge demand for cement, as there has been a push in recent years to improve the country’s existing infrastructure.
The construction activity has been picking up pace both in bigger cities and smaller towns.
These factors have resulted in a growing demand for cement.
However, the CCI said that the 11 accused firms did not increase their supplies to meet the surge in demand, a move it said resulted in higher cement prices.