Amazon appears untouchable.
It's rallied 37 percent this year, outperforming the market nearly fourfold. And a stunning quarter, reported last month, prompted nearly two dozen firms to up their price targets on the e-commerce giant; a handful of those newly minted price targets place the company north of the $1 trillion threshold.
But at this juncture, I suspect a black swan has taken flight. Just consider the stock's presence in so many passive vehicles.