Double Trigger Acceleration

Double trigger acceleration is the vesting structure requiring two events before unvested shares accelerate: a change of control plus a qualifying termination. The change of control (acquisition, merger, asset sale) plus termination without cause or resignation for good reason within a 12-18 month window means holders accelerate only if the acquirer terminates them or pushes them out, protecting both the holder and the acquirer's retention lever. It is the modern default acceleration structure for founders and executives in venture-backed companies and the structure most aligned with investor preferences.

The mechanic of double trigger:

• First trigger - change of control: typically defined as acquisition of >50% of voting power, merger where existing stockholders own less than majority of surviving entity, sale of substantially all assets. Specific definition varies; should be precise in the equity agreement.
• Second trigger - qualifying termination: either termination without cause by the company (acquirer) OR resignation by the holder for "good reason." Good reason typically includes:
  • Material reduction in title, role, or responsibilities.
  • Material reduction in base compensation.
  • Required relocation beyond a defined distance (often 25-50 miles).
  • Material breach of the holder's employment agreement.
• Timing window: the second trigger must occur within a defined window after the first trigger, typically 12-18 months. Outside that window, the second trigger no longer triggers acceleration.
• Acceleration percentage: typically 100% of unvested for founders; 50-100% for executives; 25-50% for senior employees. The percentage is independently negotiated.

Concrete example: founder has 1M shares of founders stock, currently 50% vested (500K vested, 500K unvested), with double-trigger acceleration on the full 500K unvested.

• Change of control, founder stays through transition and continues working: no second trigger fires. Founder vests on original schedule under acquirer. After 1-2 more years, founder is fully vested. Voluntary departure later doesn't trigger acceleration.
• Change of control + acquirer terminates founder 8 months later without cause: both triggers fire (within 12-18 month window). 500K unvested accelerates immediately. Founder owns 1M shares fully vested.
• Change of control + founder resigns 6 months later because role was demoted: if "demotion" qualifies as good reason in the agreement, both triggers fire and 500K accelerates. If not, no acceleration.
• Change of control + founder is terminated 20 months later: second trigger is outside the 12-18 month window, no acceleration.

Why double trigger is the modern default:

• Holder protection: protects the holder against bad-faith termination by an acquirer who wants to capture the equity without retaining the talent. The acquirer can't fire the holder to claim unvested equity without triggering acceleration.
• Acquirer retention lever: if the holder stays and works, no acceleration triggers. The acquirer retains the time-vesting structure that incentivizes long-term retention.
• Investor alignment: investors prefer double trigger because it preserves acquirer flexibility and typically results in higher deal prices than single-trigger-heavy structures.
• Industry standard: most modern offer letters and equity plans default to double-trigger, making it the path of least resistance in hiring negotiations.

The "good reason" definition matters enormously: a narrow good-reason definition makes double trigger less protective (the executive can only trigger via termination, not resignation); a broad good-reason definition (covering demotion, compensation reduction, relocation, material breach) makes double trigger more like single trigger in practice. Negotiate the good-reason definition explicitly.

What founders get wrong: Accepting double-trigger as a structural concept without negotiating the specific good-reason definition. A double-trigger with narrow good-reason (only covering termination by the acquirer) is much less protective than a double-trigger with broad good-reason (covering demotion, compensation cuts, relocation, material breach). The right discipline: at hiring, negotiate the specific good-reason language; ensure it covers material role changes, material compensation reductions, required relocation, and material breaches of the employment agreement; document precisely in the equity agreement and offer letter so the structure works as intended at the actual transaction.

Related: Vesting Acceleration · Single Trigger Acceleration · Vesting · Acquisition · Founder Vesting

FAQ

What is double trigger acceleration?
A vesting acceleration structure requiring two events both to occur: a change of control AND termination of the holder's employment without cause (or resignation by the holder for good reason) within a defined window (typically 12-18 months) after the close. Both triggers must fire for acceleration to occur.

Why is double trigger the modern default?
Because it protects the holder against bad-faith termination by an acquirer (acquirer can't fire to capture unvested equity), preserves acquirer retention lever for executives who stay willingly, aligns with investor preferences (higher deal prices than single-trigger heavy structures), and reflects industry standard at most venture-backed companies.

What is "good reason" in double trigger?
The set of conditions under which the holder can resign and have it count as a qualifying termination for acceleration. Typically includes material reduction in title/role/responsibilities, material reduction in base compensation, required relocation beyond a defined distance, and material breach by the company. The definition should be negotiated explicitly because narrow vs broad good-reason significantly affects how protective the double-trigger structure actually is.