No, the fiduciary duty the company has to shareholders is vague in this regard and practically speaking they can define the shareholders interest broadly, for e

No, the fiduciary duty the company has to shareholders is vague in this regard and practically speaking they can define the shareholders interest broadly, for example maximising returns at some indeterminate point in the far future. Shareholders can try to sue over this but almost certainly would lose the suit unless real malfeasance is uncovered. IANAL though.