Editor's Note: In this feature from Stockpickr, we highlight lists of stocks that have made new highs, lows or seen other unusual activity.52-Week Highs: As the price of crude oil rose on the New York Mercantile Exchange Thursday, industry heavyweight Exxon Mobil ( XOM) added $1.42, or 1.7%, to a 52-week high of $84.77. Biggest % Gainers: Fuel cell maker Hoku Scientific ( HOKU) skyrocketed 47% after the company announced a $678 million polysilicon contract. Beginning in 2009, Hoku will deliver polyscilicon to Suntech Power ( STP) over a 10-year period. Hoku shares rose $2.15 to $6.75. 52-Week Lows: Drugmaker Sanofi-Aventis ( SNY) plunged to $41.33, a 52-week low, after the Food and Drug Administration indicated it would reject the company's weight-loss drug Zimulti. The news sent shares tumbling $1.74, or 4%. Biggest % Losers: Capstone Turbine ( CPST) decreased 8% Thursday, after the microturbine maker reported a slump in fourth-quarter and full-year revenue. Shares of the Chatsworth, Calif.-based company fell 9 cents, landing at $1.03. Rising on Unusual Volume: Trading at double its average volume, Homex Development ( HXM) increased 3.8% during Thursday's rally. Unlike its fellow American homebuilders, the Mexico-based company is steadily expanding and recently reported 20% growth in first-quarter revenues. Shares gained $2.29 closing at $62.59. Stocks With Unusual Option Activity: Exelon ( EXC) was experiencing unusual options activity.