Equity (that is, stock options or shares of stock) is often part of an employee’s compensation package, so startups and other private companies may be understanding of employees who seek liquidity for that equity for personal needs, portfolio diversification, etc.
To find out if you can sell your shares, you might read over company documents such as your employee stock option plan, which could specify rules and restrictions around selling your shares.
Still, there can be nuances, so you might speak with your HR department or other leadership to confirm if and when you can sell your shares. A Forge Private Market Specialist can also help you navigate your interactions with your company and guide you through your company's preferred transaction process.