A deepening scandal involving Nvidia CEO Jensen Huang is unnerving Korean investors, as the chip giant's shares are falling and uncertainty mounts over his future. Nvidia is the second-most-held U.S. stock among Korean investors after Tesla, leaving local shareholders exposed to mounting losses as the chipmaker's shares plunged amid the scandal. Korean investors held about $13.65 billion worth of Nvidia shares as of Thursday, according to data from the Korea Securities Depository. An estimated 800,000 retail investors in Korea own shares in the chipmaker. Nvidia shares have fallen nearly 15 percent since the company announced an investigation into these allegations. Assuming the retail investors maintained their holdings, the 15 percent decline in shares would amount to an estimated $2.4 billion in valuation losses. The losses extend beyond direct shareholdings. Some 153 exchange-traded funds (ETFs) listed on the Korea Exchange have exposure to Nvidia. The ACE Nvidia Bond Mixed ETF, with assets of about 197.9 billion won ($148 million), has roughly 30 percent of its portfolio invested in N