"Sony Corp. stock on Tuesday closed at its highest level since January 2008 in Tokyo to become the biggest Japanese electronics maker by market capitalization for the first time in more than 15 years.

Sony closed at a 10-year high of ￥5,705 ($51.30) on Tuesday, following a 4.5 percent rise Monday, taking its total market value to around $65 billion, allowing it to overtake industrial instrument and equipment maker Keyence. The stock is up more than 12 percent so far this year.

With Sony's gaming, film and music divisions forecast to provide a combined 51 percent of its profits for the current fiscal year ending March 2019, some have highlighted that the conglomerate has become more an entertainment than an electronics giant."