Question about btc price…

I’m somewhat new to Bitcoin. My understanding is that, like other commodities, its price rises and falls based on supply and demand. Of course other smaller factors also play a role.

But my question is this: Since it is a fixed, limited asset (21 million supply), shouldn’t the price rise very noticeably when an enormous purchase is made? For example, Saylor’s Strategy purchases like 200,000 Bitcoin. That is a gigantic percentage of the market cap. How come the price didn’t move at all?

I’ve also noticed other huge acquisitions that don’t affect the price. In fact, the pumps seem completely random most of the time. They don’t seem to correspond to supply at all…