

Given that Huang said he was unfaithful to his wife and made a public apology to her, I don’t think they had an open or poly agreement. As another poster mentioned there might not be a prenup either so a divorce (which is likely) will force Huang to hand over half of his shares making his wife a major shareholder overnight. That creates a lot of tension for people invested in Nvidia.
She’s never gonna be CEO. She could with a divorce become a major shareholder and thus have serious power over the direction of the company. She likely has no experience providing direction let alone for such a huge company and that creates uncertainty. No one wants to invest in uncertainty hence stock prices plummeting just on the outlook that this can turn sour.