Private shares are typically restricted. To resell, you usually need both:
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● A legal exemption from registration (e.g., Rule 144 for public resales once conditions are met; Rule 144A for resales to qualified institutions), and
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● Contractual permission (company ROFR and transfer restrictions).

Even when legally allowed, companies often limit transfers to control their cap table. Organized secondary platforms can facilitate sales once a company approves. Expect discounts, limited windows, and paperwork (legend removal, opinions). It’s possible—but not always simple.