Please read this entire post before posting your own suggestion. Saves everyone the time and effort. Thanks!

Corporations that I considered but rejected:
- Stark Industries (Iron Man): The logo is atrocious, does not look good in Stellaris Gold and is barely readable because of how low resolution the actual emblems are in game. Also, it's Disney property.
- RED, BLU and TF2 logos: While Blu looks tight, but still workable, the Red logo is a disaster - thin lines, squiggly writing and much detail does not translate into Stellaris Gold at all. And because I couldn't with good conscious include Red, I decided to leave Blue out too, because what's Blu without Red? TF2 logo didn't make the cut because apart from the logo of the game itself, I couldn't find any reference to it being an actual, canon corporation, apart from a TF Industries company, but their logo is just writing so it's kinda bad.
- All of the Outer Worlds corps: Their logos are just too complicated, too colourful and packed with writing. I just couldn't fit them in a 128/128 pixel square and not squint. They're great for the fanciful old-west aesthetic of the Outer Worlds, but not for the slick, simple aesthetic of Stellaris, I'm afraid.

Corporations I might add in the future:
- Abstergo (Assassin's Creed): Don't know much about them and never played an Assassin's Creed game so not sure if they fit the theme/requirements. If you think they fit tell me why and I'll look into it.

Before you suggest a corporation, make sure their logo/emblem conforms to these 3 rules:
1. No more than 2 lines of writing, and no more than 10 characters. It just looks bad because Stellaris emblems are really low resolution (128*128), and also any logo that just spells out the name of the corporation in a generic font without any flair is frankly ugly. Hyperion is close to being the limit of what can be accepted.
2. No Disney flagship properties. Their lawyers often have no idea how Fair Use works and can be overzealous in securing their company's IPs. So no thank you.
3. No logo that obviously breaks the Steam or Paradox terms of service. Hopefully don't have to explain that one.

Thanks for reading this and looking forward to your suggestions. Cheers!