Will state-owned securities companies dismiss employees?

I won't.

As long as it is done well, it is not illegal or disciplinary. Will not be fired.

Securities companies will be dismissed after they join the company. When recruiting employees, enterprises also have a series of assessment indicators for employees, or have some job requirements. If your work performance can't meet the company's requirements for your position, the company can terminate the labor contract for you according to your work performance after you join the company. You have no way to refute it.