US stock futures are trading mixed this Tuesday morning. Here are the stocks investors are watching today: GE General Motors is expected to report earnings of $2.20 per share on $45.80 billion in revenue before the opening bell. According to Benzinga Pro Data, shares fell 0.5% to $79.05 in after-hours trading. WR Berkeley reported inline fourth quarter earnings, while revenue came in above expectations. The company posted earnings of $1.13 per share. And sales of $3.72 billion topping estimates. Shares rose 1.2% to $67.71 in after-hours trading. Boeing (BA) Boeing is expected to post a quarterly loss of 39 cents per share on $22.47 billion in revenue. With results due before the market opens, shares edged up 0.1% to $248.52 after hours. After the closing bell, New Corp reported weaker than expected fourth quarter results, with earnings of $1.73 per share. And revenue of $7.69 billion both missing estimates. Shares fell 3.1% to $172.13 in after-hours trading. United Health Group is e...