This might be an easy answer and i've just missed but it just occured to me that since IM1 i can't recall what Stark Industries does. Back in Iron Man they were a weapons nanufacturer, but they ceased making weapons after Tonys experience in the movie. In Iron Man 2 Tony made Pepper the CEO of the company, and Hammer industries took up the weapons contract ith the US governent, but it from what i recall it never mentioned what Stark Industries do now instead of making weapons. In The Avengers Tony builds Stark Tower and sets up a power grid, thats all we see. In Iron Man 3, Killian visits Pepper about partnering up for Extremis and is turned down. I don't remember much else of Stark Enterprises in the movie. So since "That's a weapons company that doesn't make weapons" what do they do now?