Innospec Inc.'s (IOSP) shares have gained 23.5% in the past six months. The company also outperformed the industry's rise of 8.5% and topped the S&P 500's nearly 15.8% rise over the same period. Image Source: Zacks Investment Research Let's take a look at the factors driving the stock's price appreciation. Strategic Expansion and QGP Acquisition Fuel Optimism Innospec, currently carrying a Zacks Rank #3 (Hold), is reaping significant benefits from the Performance Chemicals segment and strategic growth initi ...