The pay arrives in pieces
A stock option is the right to buy company shares later at a preset price, called the exercise price. It is not cash, and it is not a share the worker already owns. The option becomes usable only as it vests—typically in installments tied to continued employment.
That schedule turns a promised package into a series of future opportunities. A worker who leaves before an installment vests generally forfeits that portion. Even vested options may have deadlines or other conditions for exercising them, so leaving can create a second decision: spend money to buy shares now, or let the opportunity expire.
Why the tradeoff can be hard to judge
The option’s value depends on what happens to the company. If its share value stays below the exercise price, buying at that price may make little sense. If the company grows substantially, the difference can become valuable—but that outcome is uncertain, and private-company shares may be difficult to sell.
So the worker is weighing a known opportunity elsewhere against compensation that is delayed and risky. A new job may offer higher immediate pay, but leaving could mean walking away from options close to vesting. Staying preserves the chance to receive them, not a guarantee that they will be worth anything.
The calendar becomes part of compensation
Vesting can shape decisions that salary alone does not: when to change jobs, whether to wait for an upcoming vesting date, or how much risk to accept in exchange for potential upside. The practical cost of quitting is therefore not simply “losing stock.” It is giving up a future right whose value depends both on the company’s performance and on the worker remaining long enough to earn it.
