Who are the BIG 5?

well plenty of talk here , and hints of a deal with one of the big 5.
well whos got some ideas of who that might be?
are we talking Google, Apple, Microsoft, or??
sick of seeing the naysayers i see this stock equivalent to the days pre computers.
imagine what this technology can do.
medical
defence
aged care
home
basically if you want to know anything you will ask AI
Then imagine if you combined this tech with the internet of things.
example, please turn on my air-conditioning at home and put the oven on.

truely mind boggling where this could take us.