I have those shares from a (french) company I used to work for, and I don't know how to find a buyer, conduct the sale, etc. Most of the documents I have are confidential, due diligence needs the company's help and I have no clue how to pitch my shares. I have no good proof I own those shares (well, I have the signed minutes of the attribution assembly, but it's confidential). The company is not interested in buying them back.
Maybe I should sort my questions:
1) who might be interested in buying?
2) how can I pitch it to them, when most of the documents I have are confidential?
3) how do we conduct the sale?
They might reuse them for another employee compensation later or give them to the remaining shareholders.
Typically companies are keen to keep among they shareholders only those that can bring in value and try to keep out those that might sue them for mismanagement at the earliest opportunity.