The answer is **Exactly one**. **Synopsys**. That is the entire list. Together, these two firms control nearly 100% of the high-end market. The barrier to entry isn't capital. It's syntax. Engineers spend a decade mastering the interface of one platform. Switching providers requires firing your engineering team and hiring a new one. The switching costs are effectively infinite. Silicon Valley mythology loves a dropout in a garage. Jobs. Gates. Zuckerberg. This monopoly has a different pedigree.