A number of early employees at startups have recently pinged me to ask about how to sell secondary shares. Below is a short primer. A Short Guide To Selling Secondary Stock 0. Understand if you can sell some stock. Check your stock option plan or other company documents to see whether you can sell secondary stock. If your company has a general counsel, you can also ask them about the details of what you can or can not do. Alternatively, some later stage companies have a person on the finance team dedicated to secondary transactions or the CFO may be the right point of contact.