You will have to go through a lot of education and then apply for a job with them, stand out and climb the ladders as far as you can meanwhile planning out the assassination of every employee that stands in your way of climbing higher.
Alternatively if you have money buy out as many shares as you can, the shareholders that will not sell you their shares you will need to threaten and manipulate into selling without getting caught, worst case scenario you will have to assassinate them and go to the person that inherits their shares, if they too don't want to sell you will also need to assassinate them and then repeat the process until you get the shares and do so for each shareholder.