The U.S. Securities and Exchange Commission (SEC) has filed a lawsuit against Elon Musk, alleging that he failed to properly disclose his ownership stake in Twitter during its acquisition, resulting in an underpayment of $150 million. The lawsuit accuses him of securities fraud related to the timing and disclosure of his stock purchases. This legal action marks another confrontation between Musk and the SEC, recently led by Gary Gensler. Analysts view this lawsuit as significant, amid broader concerns over market regulations and the potential implications for investors.