Applied Materials' stock is in free-fall due to weak earnings and guidance. Learn why AMAT stock remains a sell with unimpressive margins and growth.

Shares of Applied Materials (NASDAQ: AMAT), the nation's biggest manufacturer of semiconductor equipment, dropped today after it offered disappointing guidance in its fourth-quarter earnings report due to weakness in China.

Applied Materials (AMAT) shares were active in late trading on Thursday after the semiconductor equipment maker reported fiscal fourth-quarter results. Read for more.

Applied Materials Inc., the largest US maker of chip-manufacturing equipment, suffered its worst stock decline in a month after giving a disappointing revenue forecast, a sign that some semiconductor customers may be holding off on orders.