Merger
Definition
A merger is the combination of two companies into a single entity, typically requiring approval from both boards, both sets of shareholders, and antitrust regulators.
Detailed Explanation
A merger joins two companies into one. An acquisition is one company buying another.
In practice the line is mostly rhetorical. Deals get announced as "mergers of equals" for reasons of employee morale and negotiating optics, while the legal structure and the resulting org chart usually make clear that one side is buying the other. This is why the industry says "M&A" (the mechanics are nearly identical) and what matters to a shareholder is the terms, not the label.
What you receive depends on the consideration structure, and it determines your tax bill. In an all-cash deal, your shares are bought out at a set price per share, which is a taxable event triggering capital gains if you're holding in a taxable account. In an all-stock deal, you receive shares of the acquirer at a fixed exchange ratio, and a properly structured stock-for-stock reorganization is generally tax-deferred (your cost basis carries over and nothing is owed until you sell). Cash-and-stock deals split the difference. If you're holding in an IRA or 401(k), none of this matters for taxes as the shares simply convert inside the account.
Getting from announcement to close takes months and can fail at several points. Both boards approve, then shareholders vote (which is what the proxy statement landing in your inbox is asking about). Deals above a size threshold must be reported to the FTC and DOJ under the Hart-Scott-Rodino Act and observe a waiting period before closing, and regulators can issue a "second request" for more information, extending review substantially. Industry-specific regulators add their own approvals for banks, insurers, and telecoms. Deals do get blocked, abandoned, or renegotiated.
The gap between the announced price and where the target trades afterward is the market pricing the odds of completion. A target announced at $50 a share that trades at $47 reflects real doubt about closing, plus the time value of waiting. Trading that gap is merger arbitrage, a strategy dominated by institutions (the returns look attractive until a deal breaks and the target falls back toward where it traded before the announcement). For a long-term investor holding an index fund, mergers require no action at all; the fund handles the conversion and the index provider adjusts membership.
Example
Charles Schwab acquired TD Ameritrade in an all-stock deal announced in November 2019 and completed on October 6, 2020. TD Ameritrade shareholders received 1.0837 Schwab shares for each share they held, with cash paid in lieu of fractional shares. Because it was structured as a stock-for-stock transaction, shareholders received Schwab stock rather than a cash payout, and the roughly $26 billion deal cleared a Justice Department antitrust review that included a second request before closing.
Key Articles Related To a Merger
Related Terms
Acquisition: One company purchasing a controlling interest in another, which unlike a merger doesn't necessarily combine the two into a single entity.
Arbitrage: Profiting from price discrepancies between related assets, including the gap between a target's trading price and its announced deal price.
Exchange Ratio: The number of acquirer shares a target shareholder receives for each share held in an all-stock deal.
Spin-Off: The opposite of a merger, in which a company separates a division into an independent publicly traded company.
Due Diligence: The investigation an acquirer conducts into a target's finances, contracts, and liabilities before completing a deal.
FAQs
What happens to my shares when a company I own is acquired?
It depends on the deal structure. In an all-cash deal your shares are replaced with cash at the agreed price. In an all-stock deal they convert into acquirer shares at the exchange ratio, with cash paid for fractional shares. Your broker handles the conversion automatically, you don't need to do anything.
Do I owe taxes when a company I own gets acquired?
In a taxable account, an all-cash buyout is a sale, so you owe capital gains tax on the difference between the payout and your cost basis. A properly structured all-stock deal is generally tax-deferred, with your original basis carrying over to the new shares. In an IRA or 401(k), neither triggers a tax bill.
What's the difference between a merger and an acquisition?
Technically a merger combines two companies into one entity while an acquisition is a purchase of one by another. In practice the terms are used loosely, and "merger of equals" is often a framing choice rather than a structural one.
Why does a target's stock jump when a deal is announced?
Acquirers almost always pay a premium above the current trading price to persuade shareholders to approve. The stock jumps toward the deal price but usually stays somewhat below it, and that remaining gap reflects the market's estimate of the risk the deal doesn't close.
Can a merger be blocked?
Yes. Shareholders can vote it down, regulators can sue to stop it on antitrust grounds, and either party can walk away if conditions in the agreement aren't met. Larger deals must be filed with the FTC and DOJ under Hart-Scott-Rodino and wait out a review period before closing.
Should I sell my shares after a merger is announced?
That's a question about your tax situation and what you think of the acquirer, not about the merger itself. Selling into the announcement pop realizes a gain now; holding through an all-stock close defers the tax and leaves you owning the combined company. Neither is automatically right.