What is founder vesting?
Founder vesting is an arrangement under which a founder earns full ownership of their own shares over time, rather than owning them outright from day one. Although the founder holds the stock, the company retains the right to repurchase any unvested portion — typically at cost or the original purchase price — if the founder leaves before the schedule completes.
Mechanically this is usually reverse vesting: the founder is issued all their shares up front but they are subject to a repurchase right that lapses over time. As the founder continues to work, shares vest and the company's repurchase right falls away. Leave early and the company can claw back the unvested shares.
The purpose is alignment and protection. Vesting ensures founders earn their equity by building the company, and it protects co-founders and investors from a scenario where a founder departs in year one yet keeps a large slice of the cap table — the so-called dead equity problem.
How founder vesting works
The terms are usually set in a restricted stock purchase agreement at incorporation and revisited at the first priced financing. The standard structure mirrors employee equity:
- Vesting period. A four-year schedule is the common default, over which the repurchase right lapses.
- The cliff. A one-year cliff means nothing vests until the founder has stayed twelve months; at that point a chunk (often a year's worth) vests at once, then the remainder vests monthly or quarterly.
- Repurchase right. If the founder leaves, the company may buy back the unvested shares, returning them to the pool and removing dead equity.
- Acceleration. Provisions may accelerate vesting on a change of control (single trigger) or on a change of control plus termination (double trigger), protecting founders in an exit.
An 83(b) election is a related tax step founders commonly file, electing to be taxed on the restricted stock at grant when its value is low, rather than as it vests.
Why investors insist on founder vesting
Investors rarely fund a company without founder vesting in place, and they often reset the clock at financing even on shares a founder already nominally owns. The logic is straightforward: a venture is a multi-year bet on the founding team, and the cap table should reflect who actually does the work over those years.
Vesting also resolves co-founder risk. If one of two equal founders leaves after six months, vesting prevents them from walking away with half the company while the remaining founder carries the next several years alone. By making equity contingent on continued contribution, vesting keeps the ownership aligned with effort — which is exactly the incentive investors are underwriting. Founders, in turn, negotiate for credit on time already served and for acceleration on an exit so they are not penalized in a sale.