Tower Semiconductor (TSEM 2.86%) is making big gains in this week's trading. The Israel-based chip company's share price was up 15.2% from last week's market close as of 3:15 p.m. ET Friday, according to data from S&P Global Market Intelligence. Tower reported its fourth-quarter results before the market opened on Feb. 14. The company posted earnings per share of $0.55 on sales of$351.71 million. Even though sales were down due to weaker demand in the automotive sector, this performance came in ahead of th ...