IPO vs acquisition: what it means for your equity
An IPO and an acquisition both turn your options into money, but on very different timelines, with different lockups and different tax bills. Here is how each one actually pays out.
By the roles.cc team··10 min read
An IPO and an acquisition are the two ways your startup equity turns into cash, and they pay out very differently. In an IPO, the company keeps running and your shares become public stock you can sell yourself, usually after a 90 to 180 day lockup. In an acquisition, a buyer sets a single price for the whole company, your vested shares convert to cash or buyer stock at that price, and what happens to your unvested shares depends entirely on a contract you did not write.
The difference matters most for two things: when you actually get money, and how much of it you keep after tax. This post walks both paths for an employee shareholder with worked numbers. For how options and vesting work in the first place, see how stock options and vesting work. For whether the equity was ever worth much, see how startup equity makes money (or not).
What is the core difference for an employee?
An IPO is a financing event. The company sells new shares to the public to raise money, and a side effect is that your existing shares become tradeable. Nobody hands you a check. You own public stock, and after the lockup you decide when to sell into the market at whatever price it trades that day.
An acquisition is a sale of the whole company. The buyer and your board negotiate one price. Your vested shares are converted at that price (cash, buyer stock, or a mix), often on the day the deal closes. You are not timing a market. You are accepting the terms of a transaction that other people structured.
In an IPO you get a liquid asset. In an acquisition you get a transaction. Those are not the same thing, and they tax differently.
How does an IPO pay out, step by step?
The mechanics are slower than people expect. The stock starts trading on day one, but you almost certainly cannot sell yet.
- 01The company lists. Shares begin trading on a public exchange. The opening price is set by the bankers and the market, not by you.
- 02You are locked up. Employees are typically barred from selling for 90 to 180 days after the listing. This is the lockup period, written into agreements you signed. The price can move a lot during it, in either direction.
- 03You exercise, if you have not. Options are not shares until you exercise them and pay the strike price. Many people exercise around the IPO so they own actual stock to sell.
- 04The lockup lifts. You can now sell, usually in trading windows that avoid earnings blackouts. A wave of employee selling on the lockup expiration date sometimes pushes the price down that week.
- 05You sell and pay tax. Each sale is a taxable event. How it is taxed depends on what you held and for how long (more below).
The honest summary: an IPO is liquidity on a delay, at a price you do not control. A company can go public at $40, and your lockup can lift at $22. That is not a rare story.
How does an acquisition pay out, step by step?
An acquisition compresses everything into a closing date, but the details hide in the deal terms.
- 01A price is set. The buyer values the company. Your per-share payout is roughly that valuation divided across the share count, after the preference stack (more on that below).
- 02Vested shares convert. Vested options and shares turn into cash or buyer stock at the deal price. This can be a single payout on close.
- 03Unvested shares get a fate. They might accelerate (vest early), convert to buyer equity on the same schedule, or be canceled. This is decided in the merger agreement, not by you.
- 04Escrow and earnouts may apply. A slice of the price (often 10 to 20 percent) can sit in escrow for 12 to 24 months to cover surprises. Some of your money arrives later, or not at all.
- 05Retention packages appear. Buyers often attach new equity or cash bonuses to keep engineers around for 1 to 4 years. This is comp for staying, not payout for what you already earned.
The preference stack is the part that surprises people. Investors usually hold preferred stock that gets paid back first. If the company raised $80,000,000 and sells for $90,000,000, common shareholders (you) split what is left after the preferred is satisfied, not the full $90,000,000 (illustrative, not advice). In a down-market sale, common stock can be worth close to zero even though the headline number looks fine. We cover this in is startup equity worth it in a down market.
What happens to unvested options in each case?
This is the question that costs people real money, and the answer is different for the two exits.
| IPO | Acquisition | |
|---|---|---|
| Vested options/shares | Become sellable stock after lockup | Convert to cash or buyer stock at deal price |
| Unvested options | Keep vesting on the same schedule, now in public stock | Depends on the deal: accelerate, roll over, or get canceled |
| Your timing control | You choose when to sell, post-lockup | Almost none. The closing date is the event |
| Price certainty | Floats with the market | Fixed at the negotiated price |
| Money you might lose | Strike cost if you exercised and the stock fell | Escrow holdbacks, canceled unvested grants |
Acceleration comes in flavors: single-trigger (vest on acquisition) and double-trigger (vest only if you are also let go after). Read your grant.
If your offer mentions acceleration, find out whether it is single-trigger or double-trigger before you assume the unvested portion is safe. For what to ask about equity terms before you ever sign, see startup equity: seed, Series A, B, what to ask.
How are the two taxed differently?
Taxes often decide which exit was actually better for you, and the rules reward holding. This is general information, not tax advice, and US rules vary by state and by whether you hold ISOs, NSOs, or RSUs.
The big lever is long-term capital gains. In the US, if you hold shares for more than one year after exercise (and meet the holding rules), gains are taxed at long-term rates rather than as ordinary income. An IPO often gives you the clock you need: many employees exercise early, start the holding period, and sell after the lockup with a year already banked. An acquisition can force a sale on the closing date before that clock runs, pushing more of the gain into higher ordinary-income rates (illustrative, not advice).
There is also QSBS (Qualified Small Business Stock). If your shares qualify and you held them more than five years, a large share of the gain can be federally excluded. Acquisitions sometimes cut the five-year clock short. IPOs do not, since you keep holding the same stock. Whether your stock qualifies is specific and worth a real accountant, not a blog post.
90 to 180 days
typical IPO lockup
You cannot sell during it
1 year
hold for long-term capital gains
After exercise, US rules
10 to 20%
price often held in escrow
In an acquisition, for 12 to 24 months
A worked example: same equity, two exits
Say you joined as an early engineer and hold options for 20,000 shares at a $1.00 strike, so exercising costs $20,000 (illustrative, not advice).
IPO path. The company goes public. After the 180 day lockup, the stock trades at $18. You exercised early, so you held more than a year and qualify for long-term rates. You sell: 20,000 x $18 = $360,000, minus the $20,000 strike, minus long-term capital gains tax. You also controlled the timing, so you could have sold in pieces as the price moved (illustrative, not advice).
Acquisition path. A buyer acquires the company at a price that values your shares at $18 each. Same headline. But if you had not exercised a year earlier, your gain may be taxed as ordinary income, a meaningfully higher rate. If 15 percent of the price sits in escrow, you receive about $306,000 on close and the rest 18 months later, if no claims hit it. And if the preference stack is heavy and the sale price is soft, your per-share number could come in well below $18 (illustrative, not advice).
Same nominal value, two different amounts of money in your pocket, on two different timelines. The exit type is not a detail.
Who tends to come out ahead in each?
- IPO favors employees who exercised early and can hold. You get the long-term tax clock, timing control, and full upside if the stock runs. The cost is risk: you might exercise, owe tax, and watch the price fall.
- Acquisition favors investors and the preference stack first. Common shareholders get what is left. A strong, all-cash acquisition above the preference stack is great for you. A soft acquihire often is not.
- Acquisition can favor you when the alternative is nothing. A clean sale beats a slow fade. Most startups never IPO, so a fair acquisition is the realistic good outcome, not the consolation prize.
Neither exit is the one to root for in the abstract. The right thing to hope for is a sale price (or trading price) comfortably above the preference stack, terms that protect your unvested grant, and enough lead time to plan the tax. That is a judgment about a specific company, which is exactly what funding stage and recency help you read.
For the decision one step earlier (whether the equity is worth weighting at all), read is startup equity worth it in a down market and how to evaluate a startup job offer.
Questions people ask
What happens to my stock options when the company IPOs?
Your options do not automatically become cash. The stock starts trading publicly, but employees are usually locked up for 90 to 180 days and cannot sell. You exercise your options to own actual shares, then sell them after the lockup lifts at whatever price the market is paying. Each sale is taxable, and holding more than a year after exercise can qualify you for lower long-term capital gains rates.
What happens to my unvested options if the company is acquired?
It depends entirely on the merger agreement, not on you. Unvested options might accelerate and vest early, roll over into the buyer's equity on the same schedule, or be canceled outright. Acceleration can be single-trigger (vests on the acquisition) or double-trigger (vests only if you are also terminated after). Read your specific grant before assuming the unvested portion is safe.
Is an IPO better than an acquisition for employees?
Not always. An IPO gives you timing control, full upside, and an easier path to long-term capital gains tax rates, but you carry market risk during and after the lockup. An acquisition fixes a price up front and can pay out faster, though investors and the preference stack get paid first, and unvested grants may be canceled. A strong all-cash acquisition above the preference stack can beat a shaky IPO.
What is a lockup period and why does it matter?
A lockup period is the window after an IPO, typically 90 to 180 days, during which employees and insiders cannot sell their shares. It matters because the stock price can swing significantly while you are locked out. A company can list at a high price and have its lockup expire at a much lower one, so the IPO-day number is not the price you actually get.
Will I pay more tax in an acquisition or an IPO?
It depends on how long you held the shares before the exit. An IPO often lets you exercise early and bank a one-year holding period, so gains qualify for lower long-term capital gains rates. An acquisition can force a sale on the closing date before that clock runs, pushing more of the gain into higher ordinary-income rates. This is general information, not tax advice, and your situation depends on whether you hold ISOs, NSOs, or RSUs and on QSBS eligibility.
What is the preference stack and how does it affect my payout in an acquisition?
The preference stack is the order in which shareholders get paid in a sale. Investors usually hold preferred stock that is paid back before common shareholders, which is what employees hold. If a company raised a lot and sells for only a bit more, the preferred can absorb most of the proceeds and leave common shares worth little. This is why a high acquisition headline number does not always mean a large payout for you.
The data is live roles
Every number in this post comes from live US engineering roles we track daily, sorted by funding recency.
About roles.cc. roles.cc is a recruiting agency for software engineers at venture-backed startups in San Francisco, New York, and other major US hubs. The public board lists engineering roles pulled straight from each company's own job site, sorted by how recently the company raised. It is free for engineers. Start by sending your resume or reading what we do.