1. Valhi ( VHI) is a Texas-based conglomerate that makes everything from security locks and ergonomic work stations to titanium ingots used in industrial manufacturing. It also operates a hazardous waste disposal business. Its shares are up 173% this year, giving it a $7 billion market value. 2. Terra Nitrogen ( TNH) produces and distributes nitrogen fertilizer products to agricultural and industrial customers. Its shares have gained 81% this year, giving it a $3.3 billion market value.