Update : Dec. 30, 2013
[Tokyo Stock Exchange, Inc.]
Japan Exchange Group, Inc. and Tokyo Stock Exchange, Inc. and Nikkei Inc. have calculated the values of JPX-Nikkei Index 400 retroactively, from December 9 to December 30 this year on an end-of-day basis, which were published today. The index will start to be calculated on a real-time basis from January 6, 2014.
The above mentioned index values were added in the CSV file here which had included the retroactive index data from August 30, 2013 to December 6, 2013, which were published on December 10.csv file
Japan Exchange Group, Inc., Corporate Communications.