This is the 449th most frequent Turkish word.
şirketi
The Turkish word "şirketi" means "the company" in English.
The word 'şirketi' here is the accusative form of 'şirket' (company) used as the subject of the action.
Şirketi yeni bir projeye başladı.
The company started a new project.
In this context, 'şirketi' indicates possession, referring to 'kardeşim' (my brother).
Bu, kardeşimin şirketi.
This is my brother's company.
Here, 'şirketi' is in the accusative case and is the object of the verb 'visited'.