Prakash Singh / Bloomberg via Getty Images Tesla CEO Elon Musk purchased about $1 billion in the electric vehicle maker's stock. Key Takeaways U.S. equities mostly rose at midday on optimism about U.S.-China trade and TikTok's future. Tesla CEO Elon Musk purchased about$1 billion in the electric vehicle maker's stock. Chinese regulators are investigating U.S. chipmakers for alleged dumping of analog integrated circuit semiconductors. U.S. equities were higher at midday on positive comments about ...