There have been very few examples at all, and most that exist are from oddball times, or circumstances. One example I know of are Israel's "labor-owned^" companies of the 50s and 60s, notably "eged" the bus company.

There were pathologies but not necessarily what you might expect. Notably, employees objected to expanding the employee pool. This led to a system where old employees were shareholders and new ones were not. This eventually led to the collapse of the system, as much for ideological (classism) reasons as practical ones.

The dynamics are poorly understood, imo. One possibility is that this type of company will tend to maximize earnings-per employee. Without the ideological baggage, I wonder if a dual classes if employees isactually a good idea.

As this article demonstrates, the lines between ownership, governance on paper & governance in practice are not straight.

^"labor" was, att, the dominant institution of the country with the ruling party, largest medical network, etc. It was a new country, post holocaust solidarity, war, socialism... exceptional circumstances and not a perfect example, certainly.