Is PTC Stock Increasing Your Market Risk?

Schneider Electric has agreed to buy PTC (PTC), an industrial software maker, and the stock rose 37.6% over the past five sessions against the S&P 500's 1.2%. After a move like that, holders may look again at what PTC does to the rest of their money, most of which probably follows the market. When the market has a bad day, does PTC make it worse for you.