That may not be a good example because everyone is saying Groq isn't worth $20B.

They were valued at $6.9B just three months before Nvidia bought them for $20B, triple the valuation. That figure seems to have been pulled out of thin air.

Speaking generally: It makes sense for a acquisition price to be at a premium to valuation, between the dynamics where you have to convince leadership its better to be bought than to keep growing, and the expected risk posed by them as competition.

Most M&As arent done by value investors.

Maybe it was worth the other $13.1B to make sure their competitors couldn't get them?