You can check your corporation rank on your player profile page. These are the corporation ranks (low to high):
-5: Bankrupt
-4: Insolvent
-3: Losing Contracts
-2: Increasing Debts
-1: Operating in the Red
0: Break Even
1: First Positive Steps
2: Operating in the Black
3: Profit Orientated
4: Customer Favourite
5: Trusted Bank Client
6: Strong Competitor
7: Brand Leader
8: Top 10 Most Valuable Corporation
9: Top 3 Most Valuable Corporation
10: Absolute Monopoly