Companies with large amount of BTC

I saw this tweet today and got me thinking: https://twitter.com/saylor/status/1476539985562152960

Is this good for Bitcoin and what does it actually mean? A single company owns now 124,391 BTC which is a significant portion of the overall Bitcoin supply. There are 18.9 million BTC have been mined altogether, estimates say 3.7 million lost (debatable, but let's go with it). That means there is 15.2 million BTC out there. This one company then owns 0.81% of that. One company.

Now, maybe they are the biggest, but in general: what if big companies with real lot of cash reserves (Apple, Google, ...) decide to buy into?

Sure, I get it, it's great, price will go up and we all benefit, but that's exactly my question: do we all benefit? What's the market dynamic here, e.g. what would happen if suddenly most BTC went into the hands of big companies? Or simply that's not possible because the price would so much soar that even they couldn't afford to buy?

What's the market theory here?