When it comes to food or 'almost' food, then, for all of them, these companies.
Realizing 90% of the 'food' is processed. The produce aisle is under represented, grains and beans that are not processed can be found from farmers or distributors. These companies will buy up vegan markets to gain their share, and make sure to earn money for their stock holders. I don't think anything will change in terms of who owns them, just what they own changes.
Since I can my own condiments except soy sauce, make my own soy milk, don't eat faux meat or cheese so far (things change you never know), and we eat mostly from the produce aisle, it's not going to matter to me. I used to work for a company that supported the canned food industry, even though I canned my food at home. I used to work for another food processing bottling line, that was fun too, I don't eat their products either. I guess I've always been this way.
If you want to do good for the ideal of veganism for whatever reason you do that, then support small businesses that don't sell out to the big names. Money though, is a powerful motivator for everyone. If you want to do good for your health, then processed food probably isn't going to impact you as much as others.