This is one of the most stressful financial moments a high earner can face. Rumors start. An announcement drops. And suddenly the equity you have been building for years is in question.
Here is what you need to know before the deal closes ⬇️:
First — Not All Equity Is Treated the Same
An acquisition does not automatically mean your equity pays out. What happens depends on your equity type, your vesting schedule, your company's deal structure, and the terms of your equity plan documents.
Read those documents. Now. Before the deal closes.
RSUs in an Acquisition
Unvested RSUs are the biggest question mark. Three things can happen:
They accelerate. Some equity plans include a change of control provision that vests unvested RSUs immediately upon acquisition. This is the best outcome and not guaranteed.
They convert. The acquiring company may replace your unvested RSUs with equivalent grants in the new company's stock. You keep the unvested equity but it is now tied to a different company.
They disappear. If the deal is structured as an asset purchase or if your plan does not include acceleration provisions, unvested RSUs may simply be canceled. This is more common than people expect.
Vested RSUs you already hold are shares you own. In a cash acquisition they typically pay out at the deal price. In a stock acquisition they may convert to acquirer shares.
Stock Options — ISOs and NSOs — in an Acquisition
Options add another layer of complexity.
In a cash acquisition, options are typically cashed out at the spread between your strike price and the deal price. If your strike price is $10 and the deal is at $40, you receive $30 per option, subject to taxes.
In a stock acquisition, options may convert to options in the acquiring company at an adjusted strike price.
Unvested options face the same three scenarios as RSUs — acceleration, conversion, or cancellation.
The critical window for ISOs: If you have unvested ISOs that accelerate at acquisition, exercising them triggers the AMT clock. You may have a narrow window to exercise and begin the holding period for favorable long-term capital gains treatment. Miss it and you lose the tax advantage.
ESPPs in an Acquisition
Most ESPP plans include provisions that close the offering period early at acquisition, purchase shares at the lower of the original offering price or the deal price, and pay out in cash or acquirer stock. Check your plan documents — ESPP treatment varies significantly by company.
Founders and Restricted Stock
If you hold restricted stock and filed an 83(b) election at grant, you already paid tax on the grant value and any proceeds above that basis are capital gains. Timing matters for long versus short-term treatment.
If you did not file an 83(b) election, unvested restricted stock at acquisition creates ordinary income on the vesting spread. This can be a significant and unexpected tax event.
The Earn-out Consideration
Some acquisitions include earn-out provisions — a portion of the deal value paid out over time based on performance milestones. If your equity is tied to earnout payments, the timing and certainty of your payout is less clear than a clean cash deal. Model the scenarios before you sign anything.
What This Looks Like in Practice
A client came to us after their biotech company announced an acquisition. They had four years of unvested RSUs, two ISO grants at different strike prices, and an ESPP contribution mid-cycle.
The deal was structured as a cash acquisition at $42 per share. Their strike prices were $8 and $14. On paper it looked like a straightforward payout.
It wasn't.
Their ISO grants had a 90-day post-termination exercise window triggered by the acquisition. Their unvested RSUs accelerated under the change of control provision — but only 50% of them. The other 50% were subject to a retention agreement tied to the acquirer's stock over 18 months.
The decisions made in the 60 days before the deal closed — which ISOs to exercise and when, how to handle the retained RSUs, how to coordinate the tax exposure across two different grant types — determined whether they kept or lost a significant portion of the windfall.
We modeled four scenarios. They made an informed decision. The tax outcome was meaningfully better than the default path would have been.
That is what pre-event planning actually looks like.
What to Do Right Now
If your company is in acquisition conversations — or you have heard rumors — do these things immediately:
Find your equity plan documents and read the change of control provisions.
Map every grant you have — type, grant date, strike price if applicable, vesting schedule, and how many shares are vested versus unvested.
Understand the deal structure — cash, stock, or mixed. Each has different tax implications.
Talk to a financial advisor before the deal closes. The decisions made in the 30 to 90 days around an acquisition can have significant tax consequences. This is not the time to figure it out afterward.
The Bottom Line
An acquisition is not automatically a windfall. It is a financial event with complex tax consequences, timing decisions, and plan-specific rules that most people do not understand until it is too late.
The employees who navigate it well are the ones who understood their equity compensation before the deal closed — not after.
If your company is in acquisition conversations and equity compensation is part of your picture, this is worth a conversation before the deal is done.
If your current advisor is not bringing this up proactively, that is worth a second look. 👀