When a company you own stock in is acquired, each of your shares is converted, at closing, into the cash, acquirer stock, or combination spelled out in the merger agreement, and that consideration usually appears in your brokerage account automatically within a few business days. That is the short version of what happens to your shares when a company is acquired. The longer version depends on how the deal is structured, whether you hold the stock in a taxable or retirement account, whether any of it came from an employer equity plan, and how long you have owned it.
What You Actually Receive
Acquirers use one of three payment structures, and the structure decides what lands in your account.
An all-cash deal pays a fixed dollar amount per share. Your shares are canceled at closing and replaced with cash. You know the exact price in advance, and payment follows shortly after the deal closes. Private equity buyers almost always use this structure because they have no public stock to offer.
A stock-for-stock deal gives you shares of the acquiring company instead of cash. The merger agreement sets a conversion ratio: at 0.5, every two of your old shares become one new share. Ratios rarely produce whole numbers, so any leftover fraction is paid out as a small cash amount alongside the new shares.
A mixed-consideration deal blends the two and is the most common structure in large public acquisitions. A typical package might be a set dollar amount plus a fractional share of the acquirer for each target share. Some mixed deals let shareholders elect their preferred split, though proration caps in the merger agreement usually limit how many shareholders can choose one form over the other.
Between the Announcement and the Closing
Public acquisitions do not close overnight. Weeks or months pass between announcement and closing, and your shares keep trading during that window. The market price typically jumps toward the deal price on the announcement date but almost never reaches it, because the gap reflects the risk the deal falls through on regulatory review, shareholder rejection, or financing problems.
Most acquisitions need shareholder approval before they can close. In a traditional one-step merger, the target’s board holds a shareholder vote; approval usually requires a majority of outstanding shares, though some charters set the bar higher. In a two-step structure, the acquirer runs a tender offer directly to shareholders and, if enough shares are tendered, sweeps up the rest in a back-end merger. Either way, your practical role is to vote or tender, or to do nothing and receive the same consideration at closing.
You are also free to sell on the open market at any point before closing. Some shareholders take a small discount to the deal price to lock in certainty rather than carry the risk the transaction collapses. If a deal does fall apart, the target’s stock price usually drops sharply back toward its pre-announcement level.
How the Exchange Actually Happens
After the deal legally closes, an exchange agent (usually a commercial bank or trust company) handles the swap of old shares for new consideration.
Shares Held Electronically
If your shares sit in a brokerage account, the exchange is essentially automatic. Your broker settles with the agent through the Depository Trust Company, and the cash or new shares appear in your account within a few business days after closing. The old ticker disappears from your holdings and the consideration replaces it. No paperwork is required from you.
Paper Certificates
If you still hold physical stock certificates, you have to mail the originals to the exchange agent along with a signed Letter of Transmittal that carries your payment instructions and tax certification (typically a W-9 for U.S. taxpayers or a W-8BEN for non-U.S. holders).1U.S. Securities and Exchange Commission. CNET Networks, Inc. Letter of Transmittal Send certificates by registered or insured mail. Payment arrives after the agent processes your materials, which can take several weeks.
Lost or destroyed certificates require an extra step. The transfer agent will typically ask you to buy a surety bond, often called a lost instrument bond, before releasing your funds. These bonds generally run 1% to 2% of the current market value of the shares. If you still hold paper certificates, replacing them before a merger materializes saves real headaches.
If You Ignore the Paperwork
Your money does not disappear, but it becomes harder to reach. The exchange agent holds unclaimed funds for a period set in the merger agreement, then returns them to the surviving company. Eventually the proceeds are reported to the state as abandoned property under that state’s escheatment laws, and you have to file a claim with the state’s unclaimed property office to recover them. That process can take months and may require proving your identity and former ownership.
What You Will Owe in Taxes
For shares held in a regular taxable account, an acquisition is a taxable event. How large a bite depends on the structure and your holding period.
Cash Deals
An all-cash merger is treated as a straight sale. Your capital gain or loss equals the cash received minus your adjusted cost basis. Shares held more than one year qualify for long-term capital gains rates of 0%, 15%, or 20% depending on taxable income.2Internal Revenue Service. Topic No. 409 Capital Gains and Losses For 2026, the 20% rate begins at $545,500 for single filers and $613,700 for married couples filing jointly. Shares held a year or less are taxed at ordinary rates, up to 37%.
Higher earners also owe the 3.8% net investment income tax on capital gains once modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly), which pushes the top effective federal rate on long-term capital gains to 23.8%.3Internal Revenue Service. Net Investment Income Tax
Stock-for-Stock Deals
A stock-for-stock exchange can qualify as a tax-deferred reorganization under the Internal Revenue Code, meaning you owe nothing on the exchange itself.4Office of the Law Revision Counsel. 26 U.S.C. 368 – Definitions Relating to Corporate Reorganizations Your original cost basis and holding period carry into the new shares, and the tax bill waits until you sell the acquirer’s stock. Not every stock deal qualifies; the merger proxy statement will state whether the transaction is intended to. Where it does qualify, the basis of your new shares equals the basis of the old shares, reduced by any cash received and increased by any gain you recognized.5Office of the Law Revision Counsel. 26 U.S.C. 358 – Basis to Distributees
Mixed Deals and the Boot Rule
When a deal that otherwise qualifies as a tax-deferred reorganization also throws in cash, the cash portion is called “boot.” You recognize gain on the boot, but only up to the total gain you actually realized in the transaction.6Office of the Law Revision Counsel. 26 U.S.C. 356 – Receipt of Additional Consideration If your total gain is $10,000 and you receive $15,000 in cash boot, you are taxed on $10,000. The stock portion stays tax-deferred.
Qualified Small Business Stock
If your shares are qualified small business stock under Section 1202, the acquisition can either preserve or destroy a substantial tax break. QSBS held at least five years qualifies for up to a 100% exclusion on capital gains, capped at the greater of $10 million or ten times your adjusted basis.7Office of the Law Revision Counsel. 26 U.S.C. 1202 – Partial Exclusion for Gain From Certain Small Business Stock For QSBS issued after July 4, 2025, a tiered exclusion applies: 50% at three years, 75% at four, 100% at five. In a cash-out merger the exclusion applies if you have met the holding period. In a stock-for-stock reorganization, QSBS status can carry over to the replacement shares in certain qualifying exchanges; if the deal does not meet those requirements, the new shares lose QSBS status. Verify the treatment with a tax advisor before closing.
Reporting
Report the transaction on IRS Form 8949 and carry the totals to Schedule D.8Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets Your broker or the exchange agent will send a Form 1099-B showing the proceeds.9Internal Revenue Service. Instructions for Form 8949 Check the cost basis on the 1099-B against your own records. Basis reporting is frequently wrong for shares acquired through employee equity plans, reinvested dividends, or older purchases where the broker never had the original data, and errors flow straight into your tax bill.
Shares in a Retirement Account
Shares held inside a traditional IRA, Roth IRA, or 401(k) do not trigger a taxable event when a merger closes. The cash or new shares simply land inside the account, and no tax is due until you take a distribution (or ever, for qualifying Roth distributions).10Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
The exception to watch for is a 401(k) that holds company stock and gets terminated or restructured as part of the deal. If proceeds are distributed to you rather than rolled into another qualified plan or IRA, they become taxable income and, if you are under 59½, may trigger a 10% early withdrawal penalty. You have 60 days to complete a rollover. Request a direct rollover from the plan administrator; an indirect rollover triggers a mandatory 20% federal withholding, which you then have to replace from other funds to roll over the full amount.
If You Hold Employee Stock Options or RSUs
Employee equity does not follow the same path as ordinary shares. The merger agreement includes a separate schedule for each type of award, and the treatment turns on whether the award is vested at closing.
Vested RSUs are treated like common stock and cashed out at the deal price. Vested stock options are cashed out at the spread, which is the deal price minus the exercise price. Options with an exercise price of $15 and a $40 deal price pay $25 each in cash. Options that are underwater at closing are canceled without payment.
Unvested awards face one of three outcomes, and the details of your grant agreement and equity plan control which one applies:
- Acceleration, where all unvested awards vest at closing and receive the same consideration as vested holders. Full single-trigger acceleration is the most favorable outcome for employees but has become less common in large deals because it creates a retention problem for the acquirer.
- Substitution, where your unvested awards are replaced with economically equivalent awards in the acquirer and your original vesting schedule continues.
- Cash-out, where the intrinsic value is paid in cash, sometimes immediately and sometimes on the original vesting schedule.
Many companies now use double-trigger vesting, which requires both the acquisition and a qualifying termination (an involuntary layoff or a constructive dismissal such as a pay cut or forced relocation) before unvested awards accelerate. Under a double trigger, the deal alone speeds up nothing; awards simply convert into equivalent acquirer awards and keep vesting. Acceleration kicks in only if you are terminated without cause within a set window after closing, commonly nine to eighteen months.
On the tax side, the spread on non-qualified stock options is treated as ordinary income subject to federal income tax and FICA withholding, just as if you had exercised normally, and your employer withholds before you see the money.11Internal Revenue Service. Topic No. 427, Stock Options Incentive stock options are more complicated. Favorable capital gains treatment on ISOs normally requires holding the shares more than two years from grant and more than one year from exercise.12Office of the Law Revision Counsel. 26 U.S.C. 422 – Incentive Stock Options A cash-out merger forces a sale before those holding periods can run, turning the transaction into a disqualifying disposition: the spread at exercise is taxed as ordinary income, and any additional gain above the exercise-date fair market value is a capital gain.
If You Think the Price Is Too Low
Most states give shareholders who believe the deal undervalues their stock the right to petition a court to independently determine “fair value.” This is called an appraisal right or dissenter’s right. Instead of accepting the merger consideration, you ask a judge to decide what your shares are actually worth, and the company pays that amount.
Appraisal sounds appealing but is demanding. You have to formally object before the shareholder vote, refrain from voting in favor of the deal, and file a court petition within tight statutory deadlines. The litigation is expensive and can drag on for years. Courts sometimes set fair value below the deal price, leaving you worse off than shareholders who simply accepted the merger consideration. The remedy is best suited to situations with concrete evidence the price was struck below fair value.
Preferred Stock and Contingent Value Rights
Preferred stockholders do not get the same deal as common holders. Preferred shares carry a liquidation preference, so preferred holders are paid first from the acquisition proceeds before common shareholders receive anything. A standard “1x non-participating” preference returns the original investment amount; if the deal price is high enough, preferred holders can instead convert to common and share in the total proceeds, whichever pays more. In later or distressed rounds, investors sometimes negotiate 2x or 3x preferences.
Some deals also include contingent value rights, or CVRs, which pay out additional money if a milestone is hit after closing, such as a drug receiving FDA approval or a product reaching a revenue target. The tax treatment of CVR payments is genuinely complex: depending on how the IRS classifies the right (debt instrument, contract right, or something else), payments can be treated as ordinary income, capital gain, or a mix. If your deal includes CVRs, professional tax advice pays for itself.