TOKYO (Reuters) - BlackRock Inc has a stake in Toshiba Corp of 5.01 percent, according to a Japanese government filing, likely becoming the struggling firm's top shareholder.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=P0oz1J9ihxc:yHCxP7ksrXs:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=P0oz1J9ihxc:yHCxP7ksrXs:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=P0oz1J9ihxc:yHCxP7ksrXs:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=P0oz1J9ihxc:yHCxP7ksrXs:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=P0oz1J9ihxc:yHCxP7ksrXs:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/P0oz1J9ihxc" height="1" width="1" alt="" />