What is double-trigger acceleration?

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Short answer: Double-trigger acceleration is an equity clause that accelerates vesting of unvested shares or options when two specific events both occur: a Change of Control of the company (acquisition, merger, IPO in some cases) AND an involuntary termination without Cause or resignation for Good Reason within a defined window (typically 12 months) following the change. It protects employees from being fired during an acquisition to avoid paying out their equity. Standard for VP and above at most growth-stage and public companies.

The two triggers, explained

The "double" in double-trigger refers to the two events that must both occur for acceleration to kick in:

Trigger 1: Change of Control. Typically defined as one of:

Acquisition of more than 50% of the company's voting stock by a third party
Merger in which the company is not the surviving entity, or where stockholders before the merger hold less than 50% of voting power after
Sale of all or substantially all of the company's assets
For some companies, an IPO (less common)

Trigger 2: Involuntary termination within the protected window. Typically defined as:

Termination by the company without Cause, OR
Resignation by the employee for Good Reason
Occurring within 12 months (sometimes 18 or 24 for senior executives) following the Change of Control

When both events occur, the employee's unvested equity vests immediately. The standard amount is 100% of unvested, though some agreements use a fractional acceleration.

If only one trigger occurs (e.g., the company is acquired but the employee keeps their role), no acceleration happens. The employee continues to vest on the original schedule.

Why double-trigger exists

Double-trigger acceleration solves a specific problem in M&A.

When a company is acquired, the acquirer often consolidates roles. Some employees are kept; some are terminated; some are repositioned. Without acceleration protection, the acquirer could fire all the employees with significant unvested equity immediately after closing, saving substantial money on the equity that would otherwise vest over time.

Double-trigger acceleration aligns employee and shareholder incentives. Employees who stay engaged through an acquisition (Trigger 1) but are then let go (Trigger 2) get the value of their equity that the acquisition created. Employees who keep their roles continue to vest normally.

This structure is fair to both sides:

The acquirer can still terminate employees in good faith for performance or restructuring reasons; the acceleration only kicks in for terminations without Cause
Employees get protection against being fired solely to avoid equity payouts
Single-trigger (vest immediately on Change of Control regardless of continued employment) would be too generous, since it would pay out equity even to employees retained through the transition

How double-trigger compares to single-trigger

Feature	Single-trigger	Double-trigger
What triggers acceleration	Change of Control alone	Change of Control + involuntary termination
Acquirer's willingness to honor	Low; they often refuse to accept	High; aligns with industry norm
Tax treatment	Often hits 280G excess parachute	Less commonly hits 280G
When commonly granted	C-suite executives, founders	VP+ at most growth companies, all hands at some startups
Industry norm	Rare in modern offers	Standard for senior roles

Single-trigger acceleration is unusual today. Most modern offers use double-trigger because it's better aligned with acquirers' expectations and creates fewer tax problems.

Standard terms by level

Typical practice at venture-backed and public companies:

IC and Manager: Often no acceleration. Some companies offer partial double-trigger (e.g., 12 months of additional vesting) but it's not standard.
Senior IC / Senior Manager: Some companies provide partial acceleration (12-24 months) on double-trigger. Worth negotiating.
Director: Partial acceleration (12-24 months) common; full acceleration negotiable.
VP: Full double-trigger acceleration (100% of unvested) is standard. Should be in the offer.
SVP / EVP / C-Suite: Full double-trigger acceleration. Often paired with non-CoC acceleration (6-12 months on termination without Cause outside any CoC scenario).
Founders: Often have single-trigger or hybrid arrangements; specific to the company.

Negotiating double-trigger language

If your offer lacks double-trigger acceleration and you're at a level where it's standard, this is one of the highest-leverage asks. Sample counter language:

"In the event of a Change of Control followed within 12 months by Employee's termination by Company without Cause or Employee's resignation for Good Reason, all unvested equity held by Employee shall fully accelerate and become vested as of the date of termination. 'Change of Control' means [standard definition: 50%+ voting stock acquisition; merger where stockholders before hold less than 50% after; sale of substantially all assets]."

Things to negotiate within the double-trigger framework:

Acceleration percentage: 100% is the strongest; some agreements limit to 50% or to a specified number of months
Window length: 12 months is standard; 18-24 months is achievable for senior roles
CoC definition breadth: Include asset sales, not just stock acquisitions
Cause definition: Narrow Cause definition makes it harder for the acquirer to terminate "for cause" to avoid acceleration
Good Reason scope: Include reporting line changes and material role changes, not just comp cuts

What to do next

If you want a delivered analysis of your offer's equity treatment in M&A scenarios, including specific recommended language for double-trigger acceleration, we deliver one in 24 hours for $199. See Offer Review.

Sources

Standard venture capital equity plan templates
Council of Institutional Investors executive compensation guidance
IRC § 280G (parachute payment limits, which affect single-trigger more than double-trigger)
IRC § 409A (deferred compensation, relevant to acceleration timing)

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Last updated: Sun May 31 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

Counteroffer is a contract analysis service, not a law firm. This page is informational, not legal advice.