 Arconic Inc. shares rose 2 in premarket trade Tuesday, after the company posted better-than-expected first-quarter earnings and raised guidance, citing higher aluminum prices and strong orders from the aerospace sector. The maker of aluminum panels for cars and planes said it had net income of 52 million, or 46 cents a share, in the quarter, up from 46 million, or 42 cents a share, in the year-earlier period. 