: Gained 387% due to positive developments in its painkiller and immuno-oncology portfolio.

: One of the year's biggest winners, surging 438% . The biotech firm saw its valuation jump from roughly $200 million to over $1.4 billion following a key collaboration with a major pharmaceutical player.

The year 2017 was a landmark year for equity markets, characterized by a massive surge in and semiconductors . While the tech giants of the "FANG" era (Facebook, Amazon, Netflix, Google) continued to post impressive gains, the true "breakout" stories came from specialized medical research and the chips powering the digital revolution. The Best Performing Stocks of 2017

The top of the leaderboard was dominated by small-to-mid-cap biotechnology firms that saw astronomical returns following clinical trial successes or major partnerships.

For more conservative investors, the major indices also provided significant "win" stories through well-known household names.

: The top-performing stock in the S&P 500 for 2017, rising 121% . Its turnaround was fueled by a restructuring plan and a shift in investor sentiment toward utility companies.