Despite all that's going right, however, new signs indicate that the tech giant could be in a vulnerable spot against competitors. Tesla Motors (TSLA), the electric carmaker, has reportedly poached 150 employees from Apple (APPL), according to Bloomberg. This is not a surprise in the competitive world of technology, but the scale of Tesla's talent grab should be a wake-up call for Apple. That doesn't mean the iconic company is in trouble, just that it needs to innovate aggressively to stay on top. The problem is that the market share for Apple's largest business segment — the iPhone and iPad family — while still high, declined by about 2% between the fourth quarter of 2012 to the fourth quarter of 2014, ending at 20%, according to data compiled by market intelligence firm IDC. In addition, the popularity of the company's phones in China, a large and attractive market with 550 million smartphone users, could be threatened by the recent entry of e-commerce behemoth Alibaba (BABA) into this segment.