Once your company completes its IPO, there is usually a lockup period, during which you probably won’t be able to sell any of your shares. It depends on the agreement your company has with the investment bank helping your firm go public, but a typical lockup period includes the six months following the IPO.
Some companies may offer an early lock up release as part of a standard lockup. An early lock up release may allow for limited ability to sell a portion of equity if and when certain metrics are obtained. Not all companies offer this, and the rules can be specific, so you’ll want to check your plan agreement to know the details.