Question about assets/partners leaving

[cianosheehan]

If someone had a share in a company and was leaving that company (being asked to leave, or agreeing to leave), is that person entitled to the value of the companies assets? Supposing the company had something that was currently valued at $1000, but the price of which could very easily increase or decrease over time, if the person owned 20% of company before leaving would they be entitled to $200 because of that asset and its current value? Or is the potential value of assets taken into consideration when determining someones entitlement?
Cheers