When a company you own gets acquired, your shares can turn into cash, stock in the buyer, or a mix of both, often without you doing anything. This guide explains exactly what an acquisition does to your position, how to update your holdings by hand so your cost basis stays accurate, and how to set price alerts on stocks you own that are takeover targets.
What is a corporate action, and why should investors care?
A corporate action is any event initiated by a company that changes its shares or their value, including acquisitions, mergers, stock splits, spinoffs, dividends, and delistings. These events can silently reshape your holdings, converting shares into cash or new tickers overnight.
The July 29 news that Verisk acquired McKenzie Intelligence Services, alongside Descartes Systems Group signing a new transportation management system customer, are good examples. One reshapes a private target's ownership, the other quietly signals revenue momentum that moves a public stock.
For retail investors, the key point is simple. Corporate actions are not optional to track. They directly affect your cost basis, your tax liability, and the number of positions in your account.
What actually happens to your shares when a company you own is acquired?
When a company you own gets acquired, your shares are typically converted into cash, buyer stock, or a combination, based on the deal terms. You do not choose this; the merger agreement dictates it.
The three most common acquisition payout structures
- All-cash deal: You receive a fixed price per share, often at a 20% to 40% premium to the pre-announcement price. Your position closes and cash lands in your account on the closing date.
- All-stock deal: Your shares convert into shares of the acquirer at a set exchange ratio, for example 0.75 buyer shares per 1 target share. Fractional shares are usually paid out as cash.
- Cash-and-stock (mixed) deal: You get part cash, part buyer stock, such as $30 cash plus 0.4 shares per target share.
Timing: announcement vs. closing
The announcement date and the closing date are different, and the gap matters. Deals can take 3 to 12 months to close, pending shareholder votes and regulatory approval.
- On announcement, the target's price usually jumps toward the offer price but trades at a small discount, reflecting deal risk.
- At closing, the conversion happens and the target ticker is delisted.
- If the deal fails, the price often falls back, sometimes below where it started.
How does an acquisition change your cost basis and taxes?
An acquisition changes your cost basis differently depending on whether you receive cash or stock. Cash payouts usually trigger a taxable event, while qualifying all-stock mergers often defer the tax.
Here is the practical breakdown for a typical US-listed holding:
| Deal type | Taxable now? | New cost basis |
|---|---|---|
| All-cash | Yes, capital gain/loss | N/A, position closes |
| All-stock (qualifying) | Usually deferred | Carries over to buyer shares |
| Cash-and-stock | Partially taxable | Adjusted for cash received |
Getting this right matters because your weighted average entry price on the new buyer shares determines your future gains. If you track everything in a spreadsheet, an acquisition is exactly the kind of event that breaks your formulas. Our comparison of portfolio trackers versus spreadsheets covers why manual logs fall apart during corporate actions.
How do you record an acquisition in PortfolioTrackr?
PortfolioTrackr has no corporate action entry, so on a portfolio you manage by hand you record the deal yourself. Nothing is adjusted automatically.
Step-by-step for an acquisition
- Open the position for the acquired ticker, for example MKZI or any target you hold.
- For a cash deal, record the sale of the whole position at the cash per share.
- For a stock deal, remove the old position and add the buyer shares: your share count times the exchange ratio.
- Enter the buyer position's cost basis yourself from the deal terms, since nothing carries over automatically.
If your broker already processes the conversion and you have a connected account, the change often syncs automatically. Learn how syncing works in our guide to connecting your brokerage account to a portfolio tracker. Even so, always verify the recorded cost basis, since broker data feeds sometimes lag on complex mixed deals.
What if you hold the acquirer, not the target?
If you hold the acquirer, you usually do nothing to your position, but you should reassess your thesis. Acquisitions can dilute existing shareholders when funded by new share issuance, or add debt when funded by borrowing. Log a note on the position so you remember why the fundamentals shifted.
How do you set price alerts on stocks that could be acquired?
PortfolioTrackr has no merger, corporate action or news alerts. What you can set is a price level on a holding or a watchlist entry, and you hear within a minute of that level being hit.
Levels some holders set on a possible takeover target:
- A level well above today's price, since a 15% to 30% overnight jump often signals a takeover bid before headlines catch up.
- A level below today's price, in case a rumored deal falls apart and the price drops back.
PortfolioTrackr alerts are price levels, so a deal reaches you as an alert only when it moves the price through a level you set, just as an earnings surprise does.
Verify before you react
Not every M&A rumor is real, and fake takeover headlines are a growing problem. A spoofed acquisition rumor can spike a stock 10% or more in minutes before it collapses. Before acting on any alert, confirm the source, a tactic we detail in our guide to spotting fake market alerts and verifying breaking news.
Why do multi-broker investors miss corporate actions?
Multi-broker investors miss corporate actions because each broker only notifies you about the specific holdings sitting in that account. If your target company is in your Interactive Brokers account but you rarely log in, the alert can slip past you entirely.
Common gaps that catch investors off guard:
- Holdings spread across Schwab, Alpaca, and a UAE broker on the Abu Dhabi Securities Exchange, each with separate inboxes.
- Small positions you forget you own until they are suddenly converted to cash.
- Cross-border deals where a foreign-listed target follows different disclosure timelines.
A consolidated tracker helps by keeping every position in one place, so you are not relying on one inbox per broker. That single-pane view is the core reason multi-broker investors move off native broker apps, as covered in our real-data comparison of the best portfolio trackers.
The bottom line
Acquisitions quietly rewrite your holdings, turning shares into cash, buyer stock, or a taxable mix, often while you are looking the other way. The two habits that protect you are simple: log every corporate action accurately so your cost basis and taxes stay correct, and set price alerts so a takeover jump does not catch you unaware.
PortfolioTrackr helps with both: connected brokers sync conversions for you, you can record a deal by hand on any other portfolio, and price alerts on the tickers you own tell you within a minute when a level is hit. It does not track deal news, so verify before you react.
Frequently asked questions
What happens to my shares when my company gets acquired?
Your shares convert into cash, buyer stock, or a mix, based on the merger agreement. All-cash deals close your position and deposit cash. All-stock deals convert your shares at a set exchange ratio. The conversion happens on the closing date, when the target ticker is delisted.
Do I pay taxes when a stock I own is acquired?
Usually yes for cash payouts, which trigger a capital gain or loss. Qualifying all-stock mergers often defer the tax and carry your cost basis to the buyer shares. Cash-and-stock deals are partially taxable. Confirm treatment with your local tax rules, since specifics vary by country.
How do I log an acquisition in PortfolioTrackr?
PortfolioTrackr has no acquisition entry type. On a portfolio you manage by hand, record the sale of the old position at the cash price, or for a stock deal remove it and add the buyer shares with the cost basis from the deal terms. A connected broker usually syncs the conversion for you.
How can I get alerts about mergers for stocks I own?
PortfolioTrackr has no merger alerts. You can set price levels on your holdings and watchlist entries, and you hear within a minute when one is hit, so a takeover jump through your level reaches you. That covers every portfolio in one place, not scattered across separate apps.
Why did my stock disappear and turn into cash overnight?
That almost always means an acquisition closed and your shares were converted to cash. The target ticker gets delisted on the closing date and the agreed cash-per-share lands in your account. Check the deal terms and log the corporate action so your records and tax basis stay accurate.