Legion of Corps (White Giant)

My country, Legion, keeps losing Corp Value. Which corps are my unprofitable ones?

And, by that, I mean which ones should I turn around, which should I close?

On your My Corporations page you'll see a link near top that says "profit, cash, and debt" .... click that link

You'll then see a list of your corps, their respective profits or losses, and any debt they have.

You may also want to check your trade strategies and supply qualities.... make sure you're not buying at "any" quality.