This is the 7333rd most frequent Turkish word.
firması
"Firması" means "company" or "firm" (possessive form: "its company" or "the company of").
Here, 'firman' is the noun 'firma' (company) in its genetive form, linked to the possessive adjective 'nın'.
Bu firmanın ürünleri çok kaliteli.
The products of this company are of very high quality.
In this sentence, 'firmasına' refers to the noun 'firma' (firm), in the dative form with the meaning 'to the firm'.
O yeni bir mimarlık firmasına katıldı.
She/He joined a new architecture firm.
Here, 'firmamız' is the noun 'firma' (company) with the possessive suffix indicating 'our' company.