I don't know if its been said but you can also make money on the back end too. I don't know about the first mission but for the second one after you sell your stock you can then buy the rival company and make out too. This is because their stock will rebound.
22 PS4 Now playing Rocket League; 103 PS3
Now Playing None; 91 Xbox360
Now retired. 10 XB1 No playing Gears of War Ultimate