Rosen and Pomerantz law firms representing AMDs investors claim that the processor maker had prior knowledge about the Spectre variant 2 vulnerability. Investors are also claiming that the stock prices have dropped upon the release of BIOS updates for the Spectre variant 2 vulnerability.
https://www.notebookcheck.net/AMD-hit-by-double-class-action-suit-over-Spectre-vulnerabilites.278930.0.html