And, insofar as such an obligation to “maximise shareholder value” might exist, that obligation doesn’t necessarily translate into “maximise profit”.
The shareholders of a theatre company might care more about breaking even while getting an interesting assortment of plays produced with a great cast than they do about making a bunch of money out of the venture, so an executive who makes a bunch of money by running productions of uninspired cash grab shows won’t actually be maximising value. Likewise, I’m sure that Rob McElhenney and Ryan Reynolds care more about Wrexham AFC’s managers getting good athletic results than they do about making a bunch of money.
And even where it does translate into "maximise profit" because it's what shareholders of a particular company may want, there is no timeframe for it, and there is no way to tell whether any particular decision by the CEO runs contrary to the goal of eventually maximising profits.
Companies can spend all their revenues plus a constant stream of new capital on growing market share or revenue, on charitable activities or the happiness of employees, on huge research and development projects or on restructuring after restructuring and still credibly claim that all of it is ultimately meant to maximise profits.
The point where CEOs and CFOs have to be careful is when the company faces solvency issues. That's where legal limits of freewheeling decision making kick in, because it's where it's no longer about shareholders but about creditors.
As long as the executives are behaving generally how the shareholders want, it's not a problem.
My (IANAL) reading of it is that maximising shareholder value is probably the law, but it's practically unenforcible. Being practically unenforcible doesn't stop CEOs and boards from using it as a guiding principle.
And that's just civil influence, there are legal mechanisms indeed in place if a CEO "trashes a company" and what that means is different depending on the company.
It's more like too hard to be proven in any way. Unless you live in an simulator it's really hard to say which set of decisions is better than another. People often say it is obvious or in hindsight but fact is there are no such hard proofs.
eBay v Newmark
This stupid meme needs to die already. There is no such obligation, he only has a fiduciary duty to not trash the company and spend the earnings on cocaine. "companies are legally forced to maximise profit" has never been true and this piece of misinformation has been going around for ages now.