Chip-maker, Advanced Micro Devices (AMD), surged 73% this year, making it the top stock in the S&P 500. The gains are partly coming at the expense of semiconductor giant Intel (INTC), whose stock has fallen this year on concerns about lower profit margins and possible product delays. AMD is benefiting from increased demand for PCs. Even though we live in a smartphone world, lots of businesses still need PCs, and AMD's Ryzen chips have been taking market share from Intel. The company's growth is being led by CEO Lisa Su — one of the few female CEOs in tech, let alone Corporate America. With Su on board, AMD has strengthened ties with the big PC companies like Dell and HP.