SpaceX President Gwynne Shotwell declined to rule out a future merger with Tesla $TSLA +4.60% on Friday, the day SpaceX began trading on the Nasdaq $NDAQ 0.00%, saying the two Elon Musk-led companies share overlapping goals. Speaking to CNBC, Shotwell said the two companies are heading in the same direction. "There's no question that there are synergies between Tesla and SpaceX in our futures," she said. "There's a convergence of what we're all trying to accomplish in the future."Shotwell quippe...