Now that we have several prominent companies supporting Bitcoin, I'm starting to wonder which company will be next?
I would rephrase the question a bit and ask which of all these companies will stay with Bitcoin even if things go downhill? Also, all attention has been focused on large American companies, although some will say that they are positioned globally - but one should still wonder why some other large global companies have not shown interest in investing in BTC so far?
It seems to me that there is simply too much centralization in everything that has been happening lately - the biggest exchange Coinbase - the biggest crypto fund Grayscale - the biggest companies like PayPal, Tesla, MicroStrategy and all that US based.
Will it be Walmart, Amazon, or Apple? What do you think will happen if one (or all) of these major companies invest in Bitcoin? Will it benefit the market immediately? Or will it take some time? Do you think such companies will control a huge portion of Bitcoin's supply, effectively making it centralized? Your input will be greatly appreciated. Thanks in advance. 
What doesn't seem likely to me is Apple whose shareholder is the famous Warren Buffett (Berkshire Hathaway Inc - 5.96% of total shares), and we all know what he thinks about BTC. Furthermore, there is no doubt that such news would have a positive effect on price, but only in the short term - we have an obvious example of Tesla and PayPal having their 5 crypto minutes - and today the price is equal to that produced by the news of Tesla's $1.5 billion investment in BTC.
Inevitably, BTC will be centralized in the sense that large quantities will end up in one place - and when it comes to American companies, we know that everything ends up in Coinbase Custody, and that Coinbase has under its control around 1 million BTC.