https://www.bbc.com/news/articles/cm2xrz71zm3o

In eBay vs Newmark: >Having chosen a for-profit corporate form, the craigslist directors are bound by the fiduciary duties and standards that accompany that form. Those standards include acting to promote the value of the corporation for the benefit of its stockholders. The “Inc.” after the company name has to mean at least that. Thus, I cannot accept as valid for the purposes of implementing the Rights Plan a corporate policy that specifically, clearly, and admittedly seeks not to maximize the economic value of a for-profit Delaware corporation for the benefit of its stockholders—no matter whether those stockholders are individuals of modest means or a corporate titan of online commerce.

https://courts.delaware.gov/Opinions/Download.aspx?id=143440

In the Trados case: >It is, of course, accepted that a corporation may take steps, such as giving charitable contributions or paying higher wages, that do not maximize profits currently. They may do so, however, because such activities are rationalized as producing greater profits over the long-term. Decisions of this nature benefit the corporation as a whole, and by increasing the value of the corporation, the directors increase the share of value available for the residual claimants. Judicial opinions therefore often refer to directors owing fiduciary duties ―to the corporation and its shareholders. This formulation captures the foundational relationship in which directors owe duties to the corporation for the ultimate benefit of the entity‘s residual claimants. Nevertheless, ―stockholders‘ best interest must always, within legal limits, be the end. Other constituencies may be considered only instrumentally to advance that end.

https://courts.delaware.gov/opinions/download.aspx?ID=193520

Considering the vast majority of US corporations are incorporated in Delaware, I think it's accurate to say most US companies only aim to maximize shareholder value.