Sony Computer Entertainment Inc., a fully owned subsidiary of Sony, have come to an agreement with SMBC Nikko Securities Inc., one of Japan’s three largest brokerage firms, for the transfer of 9,520,000 shares they had in Square Enix.
This transfer is expected to amount up to a total of about 4.8 billion yen (roughly $47 million) of additional profits for Sony’s first quarter of 2014.
http://www.siliconera.com/2014/04/16/sony-sells-shares-square-enix/
Edit: Looks like Sony had about 8.25% of the shares. (As of March 31 2012)
http://www.hd.square-enix.com/eng/ir/stock/shareholder.html