Thanks everybody for your input and help.
susiedqq is it possible to omit the “shareholders”? I guess your variation looks very formal, that’s what it should be.
How about the first two sentences, are they correct and formal?
1.The company has reduced the sated capital by 6.3% to 164.4 million rubles. 2.The change has been approved by the company’s shareholders at a special meeting on March 6.