Several companies have joined the Bitcoin/Blockchain bandwagon, leading towards new ATHs (All-Time-High) for major crypto assets on the market. Both PayPal and Tesla's announcement of adopting Bitcoin, has brought a certain level of confidence among investors and traders alike. People are pouring money like crazy in crypto, as they don't want to miss out the opportunity of a lifetime to make huge streams of profit.
Now that we have several prominent companies supporting Bitcoin, I'm starting to wonder which company will be next? 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.

Everything is possible, isn't it? Perhaps even pension funds will start investing in Bitcoin in the future, at least if they are not legally restricted from doing so. Would depend on the jurisdiction. Companies like PayPal offer Bitcoin, but they are still PayPal with all the issues we know about them.
It is more likely that newly found smaller companies will dominate those who have at first ignored the technology.