but thats exactly why they did it! They want to be majority shareholder to get the company under their control, and the board was likely against putting more shares on the market!

https://www.nytimes.com/2023/10/20/technology/openai-artifical-intelligence-value.html

Here it says that just a month ago, there were rumors that they would do it, but then it didnt happen, so I believe altman wanted to but the board did not.