Double trigger acceleration is a vesting mechanism that accelerates an employee's or founder's unvested equity when two specific conditions occur at the same time. The first trigger is typically a change of control event—such as an acquisition, merger, or significant ownership shift. The second trigger is usually an employment-related event, such as termination without cause, constructive dismissal, or voluntary resignation following the change of control. Only when both triggers happen does the acceleration activate, allowing employees to immediately vest portions of their remaining equity grants.
How It Works
In a standard equity grant, vesting occurs gradually over time—commonly a four-year schedule with a one-year cliff. Without acceleration provisions, employees risk losing unvested equity if the company is acquired and their role is eliminated. Double trigger protection addresses this risk by creating a conditional acceleration clause in equity agreements.
When a company receives an acquisition offer, the first trigger (change of control) is satisfied. If the acquiring company then eliminates the employee's position or the employee chooses to leave during the transition period, the second trigger activates. Depending on the agreement terms, this might accelerate 50% of remaining unvested equity, 100% of it, or some other percentage specified in the employment agreement.
Why It Matters for Investors
For angel investors and early-stage backers, double trigger acceleration has direct implications for cap table management and acquisition economics. It reduces the equity pool available for post-acquisition retention bonuses, which can impact purchase price allocation. Investors should understand these provisions because they affect the actual cost of acquiring a company—acceleration can reduce the total equity available for acquirer incentives.
For employees, this protection makes equity compensation more meaningful. It ensures they're not penalized for company transitions beyond their control. For founders, it balances employee retention with fiscal responsibility by preventing automatic acceleration upon any change of control.
Example
Consider a software startup where an engineer received a grant of 10,000 options with a four-year vest. After two years, 5,000 options have vested and 5,000 remain unvested. Tech Company X acquires the startup, and the acquiring company decides not to retain this particular engineer, offering only a small severance package. The double trigger clause in the engineer's agreement specifies that a change of control plus termination without cause accelerates 100% of unvested equity. As a result, all 5,000 remaining options immediately vest, allowing the engineer to exercise them and realize value from their early contribution.
Key Takeaways
- Double trigger acceleration requires two simultaneous events—typically a change of control plus employment termination—to activate equity vesting acceleration
- This protection benefits employees by preserving equity value during acquisitions while limiting automatic dilution for acquirers and early investors
- Terms vary significantly; understand specific acceleration percentages and trigger definitions in employment agreements and term sheets
- Double trigger provisions reduce post-acquisition equity available for retention bonuses, affecting deal economics for acquirers and exit valuations for investors