Dec 30 (Reuters) - CME GROUP INC:

* RAISES CORN FUTURES (C) MAINTENANCE MARGINS BY 14.7% TO $975 PER CONTRACT FROM $850 FOR MARCH 2021

* RAISES SOYBEAN FUTURES (S) MAINTENANCE MARGINS BY 9.1% TO $2,400 PER CONTRACT FROM $2,200 FOR JAN. 2021

* RAISES WHEAT FUTURES (W) MAINTENANCE MARGINS BY 9.1% TO $1,500 PER CONTRACT FROM $1,375 FOR MARCH 2021

* SAYS INITIAL MARGIN RATES ARE 110% OF THESE LEVELS

* SAYS RATES WILL BE EFFECTIVE AFTER THE CLOSE OF BUSINESS ON JAN. 4, 2021 (Reporting by Anjishnu Mondal and K. Sathya Narayanan in Bengaluru)