Your company just announced it's being acquired, or the discussions are far enough along that everyone knows. You have a stack of unvested equity — restricted stock units, stock options, or another form of employer stock. And the question keeping you up isn't whether the deal is good for shareholders. It's whether your unvested equity becomes real money at the close, or whether it depends entirely on what happens to your job in the combined company.
Here's the uncomfortable part. Most people assume the answer is the generous one. Most of them are wrong.
What is the difference between single-trigger and double-trigger vesting acceleration?
Single-trigger means your unvested equity vests when the deal closes, no matter what happens to your role. Double-trigger means it vests only if two things happen — the deal closes and you lose your job under specific conditions. One protects you at close. The other protects you only if you're shown the door.
The provision most people assume they have — and usually don't
Single-trigger acceleration is the version everyone hopes for. The transaction closes, and every share of your unvested equity vests that day. The acquirer wants you? You're fully vested. The acquirer eliminates your role? You're still fully vested. The close of the deal is the only event required (i.e. one trigger), which is where the name comes from.
It's generous. And that generosity is precisely why it's rare.
Think about it from the acquirer's side. If everyone's equity vests automatically at close, the acquirer has just handed a large payout to people it may not need — and removed any financial reason for those people to stay (after all, the whole point of vesting is employee retention). That's why single-trigger vesting is opposite of what a buyer wants. Buyers are paying for a business and often for the people who run it. So most company equity plans, and most negotiated deals, deliberately avoid single-trigger for exactly this reason. If you're assuming you have it, you're assuming the least common outcome.
Why keeping your job might mean waiting for your stock to complete vesting
The far more common structure is double-trigger. Two events have to happen before your unvested equity accelerates. First, the deal closes. Second, you experience what the plan calls a qualifying termination — usually defined as being let go without cause, or resigning for a legitimately good reason (a demotion, a forced relocation, a big pay cut), within a set window after close.
If the acquirer keeps you in your role, the second trigger never happens. No qualifying termination, no acceleration. You keep your job, and your stock grants will typically convert to stock in the new company, vesting along the original schedule - nothing accelerates.
This is where people get surprised. The reasonable assumption is that surviving the deal is the good outcome and losing your role is the bad one. Under double-trigger, it's the reverse for your unvested equity. The acquirer knows this too, which is exactly why the structure exists — it gives the buyer a financial reason to retain the people whose unvested equity is largest, not to cut them loose with an accelerated payout.
The document that tells you which outcome is yours
You don't have to guess which version applies to you. It's written down. The provisions governing what happens to your equity in an acquisition live in your stock plan document, typically in a dedicated section on change of control — the definition of a qualifying sale of the company.
Three things to confirm before the deal closes. First, which structure you have — single-trigger, double-trigger, or no acceleration at all. Second, if it's double-trigger, how the document defines a qualifying termination, because that definition determines whether resigning on your own terms counts or doesn't. Third, the window — how long after close the double-trigger protection lasts.
Depending on what it says, it can be worth a very large amount of money. Stock plan documents can be genuinely hard to parse, and the definition of "good reason" in particular is where the real money and the real ambiguity live. This is the point to bring in someone who reads these provisions for a living.
Pro-Tip: Obtain a copy of your employer’s stock plan document and get a trained professional to find the change-of-control acceleration provisions before the deal closes. The difference between single-trigger and double-trigger is not a detail — it is the entire question of whether you receive your unvested equity at close or only if you are later terminated. That answer is in the document. The second reason to get professional advice is that it’s important to be sure that your payout is calculated correctly. Deal terms change many times before close, and a payout that is handled incorrectly can be a very costly mistake.
If you'd like to explore whether ongoing financial planning and investment management make sense for your situation, you can schedule an intro call here:
Common Questions
Will my unvested RSUs vest when my company is acquired if I keep my job?
Only if you have single-trigger acceleration, which vests everything at close regardless of your role. If you have the more common double-trigger structure, keeping your job means the second required event — a qualifying termination — never happens, so your unvested shares do not accelerate. You continue vesting on the original schedule. The answer depends entirely on which structure your plan document specifies.
How do I find out if my equity has single-trigger or double-trigger acceleration?
Get a copy of your stock plan document. The section on change of control will state whether your unvested awards accelerate at close, only upon a qualifying termination after close, or not at all. If it's double-trigger, also confirm how it defines a qualifying termination. These definitions carry real financial weight and can be ambiguous, so it's worth having someone who reads them regularly confirm what applies to you.
What happens to my unvested stock options if I stay at the company after an acquisition?
Under a double-trigger structure, staying means your options don't accelerate — they typically continue vesting on the original schedule, after being converted into the acquirer's equity. Under single-trigger, they would have vested at close regardless. What actually happens to the shape and timing of your award post-close is spelled out in the deal terms and your plan document, which is why reading both before the transaction closes matters.
This blog was written by Jeremy Bohne, Principal & Founder of Paceline Wealth Management. Paceline is a fee-only investment advisor serving clients in the Boston area, and on a remote basis throughout the country. Paceline specializes in helping tech and biotech leaders, business owners, physicians, and those seeking financial planning services.