What Happens to Your Stock Options When Your Company Is Acquired
The merger agreement decides whether your options turn into cash, become options on the buyer's stock or disappear. Here is how each outcome works and where to find yours.
When your employer is acquired, your stock options are handled exactly as the merger agreement says. Vested options are usually cashed out at the spread (deal price minus exercise price) or converted into options on the buyer’s stock. Unvested options may be converted, accelerated or canceled. Your answer is in the agreement’s equity-awards section and your plan document.
The rules below describe how deals are usually written. Your own result depends on three documents: the merger agreement, your company’s equity plan and your individual award agreement. Where they disagree, the plan and award agreement usually control what the company is allowed to do, and the merger agreement says what it chose to do.
What are the usual ways options are treated in a merger?
Most merger agreements pick one of four treatments for each group of options, and many agreements use different treatments for vested and unvested awards.
| Treatment | What you receive | Where it shows up |
|---|---|---|
| Cash-out | Deal price minus exercise price, times the number of shares, less tax withholding | Cash deals, especially for vested options |
| Assumption or substitution | An option on the buyer’s stock, with the share count and exercise price adjusted by the exchange ratio | Deals where the buyer is a public company and wants to keep staff |
| Conversion to a cash award | The cash spread, paid later on a vesting schedule | Unvested options in cash deals |
| Cancellation | Nothing, or a small fixed payment | Underwater options, where the exercise price is above the deal price |
An assumed option keeps roughly the same value. A simple illustration with made-up numbers: you hold options on 1,000 target shares at a $20 exercise price, and the buyer pays 0.5 of its own share for each target share. The converted option covers 500 buyer shares (1,000 x 0.5) at a $40 exercise price ($20 divided by 0.5). The spread you had before closing carries over, and the original vesting schedule usually continues.
What happens to vested options in an all-cash deal?
In an all-cash deal, vested options are most often canceled at closing in exchange for a cash payment equal to the spread. You do not have to exercise them or pay the exercise price yourself.
A real example: in Sanofi’s $15.50-per-share cash acquisition of Dynavax Technologies, the merger agreement dated December 23, 2025 said each outstanding Dynavax option, vested or unvested, would fully vest and be canceled for a cash amount equal to $15.50 minus the option’s exercise price, “less applicable tax withholdings.” The exception was half of the unvested options granted in 2025. Those became cash awards worth the same spread, payable six months after closing, with faster payment if the holder was let go without cause. The terms are in the tender offer document Sanofi filed with the SEC (Offer to Purchase, January 12, 2026).
The math is simple. With 1,000 options at a $9.00 exercise price and a $15.50 deal price, the gross cash-out is $6,500 before tax withholding.
What happens to underwater options?
Options with an exercise price at or above the deal price have no spread, and merger agreements often cancel them for no payment. Your plan has to permit this.
Synopsys’s purchase of Ansys, completed July 17, 2025, shows the split. According to Ansys’s closing Form 8-K, in-the-money options held by people who had already left the company were canceled for cash, and out-of-the-money options held by former service providers were “canceled and extinguished for no consideration.” Current employees’ awards were treated separately. If you are thinking about leaving before a deal closes, check whether the agreement treats departed holders differently.
Do unvested options vest when a company is sold?
Unvested options vest at a sale only if your plan, award agreement or the merger agreement says so. The two common designs are single-trigger and double-trigger acceleration.
| Design | What triggers vesting | What it means for you |
|---|---|---|
| Single-trigger | The change in control itself | Unvested options vest at closing, fully or in part |
| Double-trigger | Change in control plus a qualifying job loss, such as termination without cause or resignation for good reason, within a set window after closing | Options keep vesting on schedule unless you lose your job inside the window |
| No acceleration | Nothing extra | Options follow the treatment the merger agreement picks, which can include assumption on the old schedule |
The definitions of “cause,” “good reason” and the length of the protection window are in your award agreement or an executive severance plan. Some plans also accelerate vesting if the buyer refuses to assume or replace the awards, so read the change-in-control section of your plan.
Where do I find out what happens to my options?
The fastest route is the merger agreement, which a public target files with the SEC shortly after signing. Then compare it with your own grant paperwork.
- Find the target’s current report on Form 8-K announcing the deal on EDGAR. The merger agreement is usually attached as Exhibit 2.1. Our guide on how to read an 8-K shows where to look.
- Search the agreement for “Treatment of Company Equity Awards,” “Company Options” or “Treatment of Options.”
- Read the plain-English version in the proxy statement (DEFM14A), the S-4 for stock deals or the Schedule 14D-9 for tender offers. Look for the section on “interests of directors and executive officers,” which often has an equity table. Our explainer on the merger proxy statement covers the layout.
- Log in to your stock plan portal and download your award agreements and the plan document.
- Write down your grant dates, exercise prices and vesting dates, because some agreements treat grants from certain years differently, as Dynavax’s did.
How are cashed-out options taxed?
A cash payment for canceled options is generally treated as compensation and paid through payroll with tax withheld. The IRS explains how option income is taxed in Topic No. 427, Stock Options.
For nonstatutory options (NSOs), the spread is ordinary income when you exercise, so a cash-out at the spread is taxed the same way. Incentive stock options (ISOs) get capital-gains treatment only if you exercise and hold the shares for the required periods, and a cash-out does not give you shares to hold. ISOs also lose their status if you exercise more than three months after leaving the company, which matters after layoffs that follow a deal. Our comparison of ISO vs NSO stock options covers the holding periods. How this applies to you depends on your income and state, so a tax professional is the right person to ask.
Questions worth sending to HR or the stock plan administrator:
- Which treatment applies to each of my grants, vested and unvested?
- If my options are converted, what are the new share count and exercise price?
- Is my acceleration single-trigger or double-trigger, and how long is the window?
- When will the cash be paid, and at what withholding rate?
Bottom line
Download your award agreements and plan document before closing, while the target’s stock plan portal still shows your full history. If you leave the company between signing and closing, your options can fall into a different category in the merger agreement, as the Ansys deal showed for former service providers.
FAQ
Can the buyer cancel my vested options without paying?
Vested options with a positive spread are usually paid out or converted into buyer options. Underwater options can be canceled with no payment if the plan allows it. The adjustment or change-in-control clause in your plan sets what the company may do.
Do I need to exercise my options before the deal closes?
In most cash deals you do not, because the cash-out pays the spread without an exercise. Whether exercising early makes sense depends on taxes and the option type, so ask a tax professional before acting.
What happens to my options if I am laid off after closing?
If your awards were assumed and carry double-trigger acceleration, a termination without cause inside the protection window usually vests them. Without that protection, unvested awards are normally forfeited, and vested ones must be exercised within the post-termination period in your agreement.
When will I receive the cash?
Cash-outs for vested options are typically paid through payroll after closing, on the timetable the merger agreement sets. Converted cash awards are paid on their own vesting dates, such as six months after closing in the Dynavax deal.
