What Is a SPAC? Definition, How It Works and Examples

In finance, a SPAC is a listed company formed to buy one private business. The SEC, the US securities regulator, defines it by its plan. A SPAC sells shares to the public, aims to complete a merger within a set time frame and returns the money if it fails. People call it a blank check company because investors do not know the target when they buy.

A SPAC sponsor sets it up. The sponsor is the firm or person that organizes and runs the SPAC, often an investment firm or a group of executives. The sponsor picks the target and negotiates the deal. In return, it receives cheap shares known as founder shares, or the promote. The SEC says these usually amount to around 20% of the SPAC’s shares after its IPO.

Founder shares are worth something only if a merger happens. That gives the sponsor a strong reason to close a deal, even a weak one. Most of the rules and risks covered below come back to this point.

The IPO SPAC meaning is simple: the SPAC goes public first and finds its business later. In a traditional IPO, an operating company sells its own shares. In the SPAC route, the shell lists and the operating company joins it. The IPO SPAC process has five steps:

1. 1.0
   The SPAC IPOBanks sell units to investors, usually at $10 each. The offering must be at least $5M. The banks’ fee is typically 5% to 5.5%, and about 3% of it is paid only if a merger closes.
2. 2.0
   The trustAt least 90% of the money goes into a trust account. It earns interest and can only be used for the merger or to repay shareholders.
3. 3.0
   The searchThe sponsor looks for a private company to buy. The SPAC’s own documents often give it 24 months. Exchange rules allow up to three years.
4. 4.0
   The deal and the voteThe SPAC signs a merger agreement and announces it. Shareholders then vote, and each one can ask for their money back from the trust.
5. 5.0
   The closingThe private company merges into the SPAC and trades under a new name and ticker. Within four business days, it files a full description of the business with the SEC.

If the sponsor finds no deal in time, it can ask shareholders for an extension. Those who object can usually redeem their shares at that vote. Otherwise the SPAC winds up and pays the trust back to its public shareholders.

A SPAC merger is the deal in which the SPAC combines with its target and the target becomes a public company. The SEC calls it a de-SPAC transaction. It can be a merger, an exchange of shares or a purchase of assets. The SEC describes it as the functional equivalent of the target’s IPO.

Before the vote, every public shareholder chooses. They can redeem, which means handing back their shares for a pro rata cut of the trust, about $10 each plus interest. Or they can stay and own part of the combined company. Many redeem, so SPACs often raise extra money from large investors in a PIPE, a private investment in public equity.

Since July 1, 2024, new SEC rules apply to these deals. The target signs the registration statement as a co-registrant and is liable for misstatements in it. The documents must reach shareholders at least 20 calendar days before the vote. The de-SPAC vs SPAC guide compares the shell and the deal side by side.

A SPAC stock trades on a stock exchange like any listed share. At first, it trades as a unit: one share plus a fraction of a warrant. After a set period, the share and the warrant trade on their own, each with its own ticker.

A warrant is a right to buy a share later at a fixed price, often $11.50 against a $10 share price. It usually becomes usable 30 days after the merger or one year after the IPO, whichever is later. The SPAC can often call the warrants early once the shares trade at or above a set level, often $18.

Before a deal, the share price usually stays close to the cash per share in the trust. A holder can redeem for that amount at the vote. After a deal is announced, the price starts to reflect what the market thinks of the target. After the closing, the stock trades as an ordinary listed company.

In investing, a SPAC is a bet on two things: the sponsor’s choice of target and the price it pays. The example below shows why the cash behind each share can shrink before the merger closes. The numbers are illustrative. The 20% promote, the 3% deferred fee and the 85% redemption rate are the typical figures the SEC reports.

• At the IPO20,000,000 units sold at $10 → $200M in the trust. The sponsor also holds 5,000,000 founder shares, 20% of 25,000,000.
• At the vote85% of public holders redeem → 17,000,000 shares bought back for $170M. $30M stays in the trust.
• At the closingThe deferred bank fee of 3% of $200M is paid → $24M of cash left.
• Cash per share$24M across 8,000,000 SPAC shares, the 3,000,000 public shares left plus 5,000,000 founder shares → $3.00 per share, against the $10 paid at the IPO.

The $10 price does not change in the merger agreement. Each remaining share is still counted at $10, but only $3.00 of cash stands behind it. The gap is the cost of the founder shares and the bank fee, spread over fewer shares. The SEC’s 2024 rules require a table showing this dilution at different redemption levels.

The table sums up the main rules for a US SPAC and where each one comes from. Exchange rules set the trust and the deadline. SEC rules set the disclosure and the liability.

Advantages

The target negotiates its price with one buyer, the sponsor, before the vote. The SEC notes that owners of private companies may see advantages over a traditional IPO. Public investors in the SPAC can redeem and get their cash back.

Risks

Founder shares and bank fees dilute the shares that stay. The sponsor gains from any deal, so its interests can differ from yours. High redemptions can leave the company with far less cash than announced.

Redemptions are the clearest sign of investor doubt. The SEC reports an average redemption rate of 38% in 2020 and 45% in 2021. In 2022, it reached 85%.

One case shows what can go wrong. In July 2021, the SEC charged Stable Road Acquisition Corp., its sponsor and its CEO, along with the target, Momentus, and its founder. The SEC said Momentus misled investors and the SPAC failed in its own checks. The parties who settled agreed to pay more than $8M, and the sponsor gave up 250,000 founder shares. The merger closed on August 12, 2021, and the company now trades on Nasdaq as Momentus. Details are in the SEC’s announcement.

If your private company agrees to merge with a SPAC, your shares are exchanged for shares of the combined company. The exchange ratio is set in the merger agreement and the SEC filings. The company’s value in the deal is counted at $10 per SPAC share. Compare it with the price of the last private round and with dilution from founder shares and warrants.

Listing does not mean you can sell at once. Existing holders often sign a lock-up, a contract that bars sales for a period after closing. Shares that were not registered in the deal fall under Rule 144. Because the SPAC was a shell company, Rule 144 opens only one year after the combined company files its full business description with the SEC.

If you hold through a fund or an SPV, a special purpose vehicle that pools investors’ money for one deal, the vehicle receives the new shares. Its manager decides when to sell them.

Related Comparisons

• IPO vs SPACHow the two routes to a listing differ in cost, pricing and risk: IPO vs SPAC.
• De-SPAC vs SPACThe shell company and the merger it exists for: de-SPAC vs SPAC.
• Direct listing vs IPOThe third route, where existing shares start trading without a bank: direct listing vs IPO.

Common Mistakes

• Treating $10 as the value of a shareIt is the IPO price and the deal’s counting unit. After redemptions and fees, the cash behind each share can be far lower.
• Ignoring the founder sharesThe sponsor’s 20% stake usually cost it very little. It comes out of everyone else’s share of the company.
• Reading the announced deal size as cash raisedThe headline assumes no redemptions. Check the final redemption level and any PIPE before the closing.
• Expecting to sell on day oneLock-ups and the one-year Rule 144 wait for former shell companies can keep pre-IPO holders out of the market.

SPAC (special purpose acquisition company)

A shell company that lists on an exchange to raise money and then merge with one private company.

Blank check company

A company with no business that raises money before it names what it will buy. A SPAC is one kind.

SPAC sponsor

The firm or person that organizes and runs the SPAC and picks its target.

Founder shares

Shares the sponsor buys cheaply before the IPO, usually about 20% of the SPAC after it. Also called the promote.

Trust account

The account that holds the IPO money until a merger or a refund. Exchanges require at least 90% of the proceeds in it.

Redemption

A public shareholder’s right to hand back shares for a pro rata cut of the trust before the merger.

De-SPAC transaction

The merger of a SPAC with its target, which makes the target a public company.

PIPE

A private investment in public equity: large investors buy shares directly, often to replace redeemed cash.

Unit

What a SPAC sells at its IPO: one share plus a fraction of a warrant.

Warrant

A right to buy a share later at a fixed price, often $11.50 for a SPAC.

Figures were last checked on October 29, 2026. The rules are United States rules. Exchange listing rules are quoted from the SEC’s 2024 release, and the exchanges’ current rulebooks are the binding text. Each SPAC’s own documents can set shorter deadlines and other terms.