For Toshiba, breaking up may be hard to do

3D Investment Partners, the second-largest Toshiba shareholder with a 7% stake, is objecting to the Japanese conglomerate's plan to split into three companies, per a letter obtained by Reuters.

Why it matters: This could set up a takeover battle for all of Toshiba, which was the target of a failed $20 billion bid earlier this year from CVC Capital Partners.