Corporation Limit

Greetings, I play as the CEO of White Giant. I have 79 corps and when I want to build a new corp I get "Sorry, you already own too many corporations." notification. Since I did not fully understand the building capacity, I purchased 10 production plants, but I still get the same text. Is there a certain limit or do I need to do something to build more corps?

I also asked Andy about the limit CEO Corp for non-premium members. No answer yet. You can assume the limit is 75 Corps for non-premium.