What happens to your stock when your startup is acquired?

Business shakeups may impact employees’ salary, job security, and stock options. Whether the move was an acquisition or a merger can have varied impacts on employees and their equity. 

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While top executives may be negotiating retention packages or accelerated vesting schedules, rank-and-file employees are often left wondering what happens to their unvested options, or whether their hard-earned equity will still be worth anything once the deal closes.

Acquisitions vs. mergers

To start, let’s define acquisitions and mergers.

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When two companies of similar size combine to form a new entity, they’re entering into a merger. These are usually billed as “mergers of equals,” though in reality, one party typically ends up taking a leadership role.

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An acquisition, on the other hand, occurs when one company takes over another — hence its alternative name, a takeover. The acquired company ceases to exist, and the acquiring company becomes the sole owner. Takeovers can be friendly, where both sides see strategic benefit, or hostile, where the acquirer bypasses management and appeals directly to shareholders.

Why mergers and acquisitions matter for your equity

With mergers, companies surrender their existing stocks, and new equity shares are issued for the combined company. That means your old options or shares are usually converted into new ones that reflect the merged entity’s capital structure.

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With acquisitions, the acquiring company's equity shares continue to trade, while the acquired company’s shares are retired. Solid equity management practices from day one can directly affect how favorable your outcome is during an exit. Sometimes employees are offered a cash payout. Alternatively, they may receive stock in the acquiring company, or a mix of both.

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In both cases, the future of your equity will not be determined until the vote for the deal is passed, and it’s cleared by regulators. Large deals often face lengthy review periods, which can leave employees in limbo for months at a time.

In an all-stock acquisition, employees and shareholders may not receive cash right away. Instead, their shares may be exchanged for shares of the acquiring company. The amount they receive depends on the conversion ratio set in the acquisition agreement.

A conversion ratio determines how many new shares someone receives for each old share they owned. The ratio is usually based on the deal terms, each company’s valuation, and the negotiated price for the company being acquired.

For example, say Company A agrees to buy Company B in an all-stock deal. The agreement says that every 2 shares of Company B will be exchanged for 1 share of Company A’s stock.

In this example, the employee does not keep the same shares of Company B after closing. Their shares of Company B are converted into shares of the acquiring company based on the agreed exchange ratio.

A stock conversion can feel simple on paper, but the real value can still move. If Company A’s stock price rises after the deal is announced, the value of the employee’s new shares may rise too. If Company A’s stock price falls, the value of the stock consideration may drop before or after the acquisition closes.

How cash and stock acquisitions change the math

Some acquisitions use a mix of cash and stock. In cash and stock acquisitions, shareholders typically receive a fixed amount of money plus a certain number of shares in the buyer.

For example, a deal might give shareholders $20 in cash plus 0.5 shares of the acquiring company for each target share. The cash portion is fixed, but the stock portion can change in value as the buyer’s stock price moves.

This matters because the final value may be different from the headline deal value. Employees and shareholders should read the acquisition terms carefully to understand whether their payout is fixed, variable, or a mix of both.

The impact on stock prices after an acquisition announcement depends on how investors view the deal. The target company tends to rise when the buyer pays a premium, but the acquiring company’s stock may move in either direction.

A buyer’s stock price may rise if investors believe the acquisition will increase revenue, improve margins, expand the customer base, or create long-term shareholder value. In that case, the market may view the deal as a smart use of capital.

But the buyer’s stock price can also fall. This can happen when investors think the company paid too much, took on too much debt, or may struggle to integrate the new company. Even a strong acquisition can create short-term pressure if the market worries about execution.

For example, if Company A announces plans to buy Company B for a large premium, investors may question whether the price is too high. Company B’s stock price may rise due to the acquisition offer, while Company A’s stock price may fall because investors are concerned about cost and risk.

What this means for startup employees

For startup employees receiving stock in the acquirer, the buyer’s market performance can matter a lot. If the deal includes publicly traded stock, the value of the payout can shift before employees are able to sell.

That is why an acquisition offer should not be judged only by the announced deal price. Employees should also understand the form of consideration, the exchange ratio, vesting treatment, lockup rules, and when they may actually be able to sell.

‍In both cases, the future of your equity will not be determined until the vote for the deal is passed, and it’s cleared by regulators. Large deals often face lengthy review periods, which can leave employees in limbo for months at a time.

When a public company is bought, the target company’s shares often rise toward the acquisition price. But they may not trade exactly at the announced deal price before the acquisition closes.

The gap usually reflects deal risk. Until closing, investors still have to consider whether the acquisition could be delayed, renegotiated, challenged by regulators, rejected by shareholders, or abandoned.

For example, say a buyer offers $100 per share for a company whose current market value was $80 before the announcement. After the announcement, the stock price may rise to $95 instead of the full $100 per share.

That discount exists because investors are not fully certain the deal will close on the original terms. If the deal becomes more likely to close, the stock price may move closer to the offer price. If problems appear, the price may fall.

What happens if the acquisition does not close

If an acquisition falls apart, the target company’s shares may drop, sometimes sharply. The stock may move back toward where it traded before the announcement, or even lower if the failed deal creates concerns about the company’s future.

For private startup employees, the same idea applies in a different way. A signed acquisition agreement does not always mean the payout is guaranteed. The deal may still depend on approvals, closing conditions, employment agreements, retention plans, or shareholder votes.

In most completed acquisitions, individual shareholders cannot simply refuse to sell and keep the same shares after the company is bought. If the deal is approved and closes, shareholders may be required to accept the consideration described in the agreement.

That consideration might be cash, stock in the buyer, or a mix of both. In an all-cash deal, shares are usually converted to cash. In a stock deal, shares may be exchanged for the buyer’s stock based on the conversion ratio.

Shareholders may have voting rights before the deal closes, depending on the company, share class, and transaction structure. But once the acquisition is approved and completed, shareholders typically receive the deal consideration rather than continuing to hold the old shares.

What if a shareholder disagrees with the acquisition?

A shareholder who disagrees with a deal may be able to vote against it if they have voting rights. In some cases, shareholders may have appraisal or dissenters’ rights, which allow them to challenge the value they receive. Those rights depend on the company’s governing documents, state law, and deal structure.

For startup employees, the practical question is usually not whether they can block the deal. It is what happens to their vested options, unvested options, RSUs, or shares when the acquisition closes.

The answer depends on the agreement. Some equity may accelerate, some may roll into the buyer’s plan, some may be canceled, and some may be paid out. Employees should review the acquisition documents, equity plan, and option grant agreement before making decisions.

How hostile deals can differ

In a hostile acquisition, the buyer tries to acquire a company without the target board’s initial support. This is more common in public markets than in private startups.

A hostile offer can create uncertainty for shareholders because the board may resist the deal, seek another buyer, or negotiate better terms. That uncertainty can affect the stock price until investors know whether the deal will move forward.

Your company has been acquired. What’s next? Start by asking these questions. 

Can you exercise before the acquisition closes?

This is possible in some cases, but it carries real risk and is a decision that depends heavily on your personal tax and financial situation. If a deal is delayed — or ultimately doesn't go through — you may face a tax burden, in the form of the alternative minimum tax, on shares that may be difficult to sell. This is a decision worth making with a tax or financial advisor rather than on a general rule of thumb; knowing how taxes impact startup equity can help inform that conversation.

How can tax-advantaged accounts affect acquisition tax?

The tax implications of an acquisition can depend on where the stock is held and how the deal is structured. In a taxable brokerage account, an all-cash acquisition may trigger capital gains tax if the shares are sold for more than the investor paid.

In a tax-advantaged account, such as an IRA or 401(k), the tax result may be different. The acquisition may still cause shares to be converted to cash or exchanged for new stock, but the investor may not owe capital gains tax at the time of the transaction inside the account.

This is more relevant for publicly traded shares than private startup equity. Most startup employees hold options, restricted stock, RSUs, or private shares outside a retirement account. Still, the distinction matters for readers comparing public company acquisitions with private startup outcomes.

Cash, stock, and tax timing

The form of the acquisition can affect when taxes may apply.

Employees should not assume every merger or acquisition is taxed the same way. The tax result can depend on the deal structure, the type of equity, holding period, account type, and whether the employee holds options or actual shares.

Will you need to re-vest under the new owner?

That depends. Vested and unvested stock options can be converted to the options of the acquiring company, with terms dependent on the deal in place. In some cases, stock options could be canceled, or a cash or stock payout could be offered. 

‍When your startup is acquired, be sure to inquire about the terms of your vested and unvested stock options. The terms of the deal often dictate whether you receive cash or shares in the acquiring company. 

Is there a secondary sale or cash-out option?

Yes. Platforms like Augment enable the sale of startup stock options to other accredited investors. These private secondary markets are relatively new, but increasingly popular, particularly for employees who want more financial certainty ahead of major corporate events.

Liquidity needs can arise unexpectedly, and equity that is tied up in a company being acquired isn't always accessible right away.

Augment operates a private secondary market platform that, where eligible, allows accredited investors to buy and sell existing stakes in private companies while they remain private. Some shareholders try to access liquidity or reduce concentration in a single company's stock — though outcomes vary, a buyer is not guaranteed, and any transaction remains subject to the risks described in the disclosures below. Here's more on why timing matters when entering the private market, especially as liquidity windows open or close around acquisitions.

Some shareholders use proceeds from a private secondary sale toward near-term expenses  such as a down payment or medical costs, or could be used to rebalance a broader portfolio — but whether any of that makes sense depends on an individual's own finances and should be discussed with a financial or tax advisor.

Platforms like Augment aim to bring transparency and structure to private-market transactions, including pricing estimates and transaction support, though private-market liquidity remains inherently less certain than public markets.

Built for startup employees

Augment’s private secondary market trading platform allows investors to buy and sell existing stakes in private companies or funds while they remain private. This enables individuals to potentially access liquidity when they need it most (though a buyer is not guaranteed), but also to diversify their financial position, reduce risk, and avoid having their entire net worth tied to a single company’s outcome. Here’s why timing matters when entering the private market, especially as liquidity windows open or close around announced acquisitions.

‍In practice, this could mean selling a portion of your shares to cover a down payment on a home, securing cash to pay unexpected medical expenses, or simply rebalancing your portfolio to include more stable assets alongside high-risk startup equity.

Augment operates a platform where eligible investors may seek liquidity in the private market, subject to buyer availability and the risks described below. By offering a transparent marketplace with pricing data and transaction support, platforms like Augment are bridging the gap between companies remaining private longer and the real, immediate financial needs of startup employees.