Is working as an accountant in commercial companies that mediate in selling products at a lower price to the acquiring owner, while other shareholders are unaware, considered unlawful (haram)?

It is impermissible for the chairman of the board or a partner to conduct a transaction between the company and himself or an affiliated company without the permission of the remaining partners. This is because an agent cannot sell to himself due to the suspicion involved and the conflict between the purposes of the two actions. The majority of jurists have held that it is not permissible for an agent to sell to himself unless authorized by the principal. What the chairman of the board does by selling to his company without the knowledge of his partners is a forbidden act. Assisting him in this is obligatory to refrain from, and if participation is inevitable, then it is not permissible to remain in a position that necessitates assisting in the betrayal of partners.