A SPAC — a special purpose acquisition company — is a shell company that raises cash in an IPO with the sole purpose of merging with a private business and taking it public. It has no operations of its own. Its only assets are the cash sitting in trust and roughly two years to find a target.

How a SPAC Is Structured

A SPAC's structure has three parts that matter for anyone analyzing one: the trust account, the founder (sponsor) shares, and the warrants.

When a SPAC IPOs, the proceeds from public investors — typically sold as $10.00 units — go straight into an interest-bearing trust account. That cash is held there, untouched, until either a merger closes or the SPAC's deadline (usually 18–24 months) passes and the trust is liquidated back to shareholders.

Alongside the public units, the SPAC's founders — the sponsor team — receive founder shares, commonly called the promote. The promote is almost always set at 20% of the SPAC's post-IPO share count, regardless of deal size. The sponsor also puts in a smaller amount of at-risk capital to cover underwriting fees and running costs during the search period.

Each public unit also usually includes a fraction of a warrant — the right to buy additional shares later at a fixed strike price, typically $11.50. Warrants are a sweetener for public investors and a source of future dilution once a deal is announced.

How the Sponsor Actually Makes Money

This is the part interviewers care about most, because it's where the SPAC structure's biggest quirk shows up. The sponsor's founder shares convert into common stock of the combined company once a merger closes — at essentially no cost beyond the sponsor's initial at-risk capital. Because the promote is a fixed 20% share count rather than a return proportional to capital invested, the sponsor can turn a few million dollars of at-risk capital into tens of millions of dollars of stock, purely by closing a deal — not necessarily a good one.

That asymmetry is the central tension in SPAC economics: the sponsor's payoff depends on getting a deal done before the deadline, while public shareholders only benefit if the deal is actually a good one.

The De-SPAC Process

Once the sponsor identifies a target, the SPAC negotiates merger terms, and the deal is put to a shareholder vote — this is the "de-SPAC." Two things happen simultaneously at that vote: shareholders decide whether to approve the merger, and — independently of how they vote — each shareholder can choose to redeem their shares for a pro-rata slice of the trust account in cash, while keeping their warrants for free.

Redemptions are often the deciding factor in whether a de-SPAC deal actually has enough cash to close. If a large share of public investors redeem, the SPAC may need a backstop — a PIPE (private investment in public equity) or a forward purchase agreement — to fill the funding gap before the transaction can proceed.

Where the Conflicts of Interest Show Up

Because the sponsor forfeits its founder shares and at-risk capital entirely if no deal closes before the deadline, sponsors are structurally biased toward closing a deal — any reasonable deal — rather than returning capital to investors and admitting the search failed. Public shareholders don't face that same pressure: they can redeem for cash at the vote and keep their warrants regardless of the outcome, so their downside is capped in a way the sponsor's isn't.

This is exactly the setup interviewers use to test whether a candidate understands SPAC mechanics beyond the headlines. Working through the actual numbers — the size of the promote, the sponsor's return multiple on at-risk capital, and how redemptions affect closing cash — makes the incentive misalignment concrete rather than abstract.

To see this worked through with real figures — a $300m trust, a 20% promote, and a full de-SPAC funding waterfall — see the case walkthrough on SPAC Transactions.

SPAC structuring sits alongside other M&A deal mechanics that interviewers like to probe in similar depth — see Cash vs. Stock Consideration and Earn-Out Structuring for two more examples of deal terms that shape who actually bears the risk in a transaction.

Why SPACs Exist as an Alternative to a Traditional IPO

The core appeal of a SPAC merger, from a target company's perspective, is speed and certainty relative to a traditional IPO roadshow. A conventional IPO requires months of investor education, a marketed roadshow, and pricing risk right up until the day of listing — the deal can be pulled or repriced if market conditions sour during the process. A de-SPAC merger, by contrast, is negotiated privately between the target and the SPAC sponsor, with pricing agreed upfront in the merger agreement rather than discovered through a live roadshow. This made SPACs particularly attractive to earlier-stage or higher-growth companies that might struggle to tell a clean, established-earnings story to public-market investors in a traditional IPO process, since a de-SPAC merger allows the target to present forward-looking financial projections in its investor materials in ways that are more constrained in a conventional IPO prospectus.

Why SPAC Issuance Boomed and Then Collapsed

SPAC issuance surged dramatically in 2020 and 2021, driven by a combination of low interest rates, abundant capital searching for yield, and a wave of high-growth private companies eager for a faster path to public markets. The subsequent collapse in SPAC issuance after 2021 came from several directions at once: rising interest rates made the opportunity cost of parking capital in a low-yielding trust account less attractive to sponsors and investors, a string of poorly performing de-SPAC mergers damaged the reputation of the structure with public investors, and increased regulatory scrutiny — including new SEC disclosure requirements specifically targeting SPAC projections and sponsor conflicts — raised the cost and complexity of running a SPAC. Understanding this boom-and-bust cycle, rather than treating SPACs as a permanently popular structure, signals to an interviewer that a candidate follows market cycles rather than only static mechanics.

How SPAC Trust Economics Actually Work

A detail that's easy to overlook is that the trust account itself typically earns interest while the SPAC searches for a target, since the cash is invested in short-term government securities rather than sitting idle. In a higher-rate environment, this trust interest can be a meaningful source of return for shareholders who choose to hold through to either a deal or a liquidation, and it also affects the redemption value per share, which rises slightly above the original $10.00 unit price as interest accrues. This is one reason SPAC shares can trade at a premium to the $10.00 IPO price even before any merger target is announced: the market is pricing in the accrued trust interest plus the option value of a potential deal, which is also why redemption decisions at the de-SPAC vote are calculated against the trust's current per-share value rather than the original issue price.

Sponsor Track Record and Why It Matters to Investors

Because a SPAC is, at the point of its IPO, essentially a blank check with no identified target, public investors are making a bet primarily on the sponsor team's ability to source and close an attractive deal rather than on any specific business. This is why a sponsor's prior track record — whether previous SPACs they've run found attractive targets and delivered positive post-merger performance, or whether they struggled to find a deal and were forced to liquidate — carries significant weight in how a new SPAC IPO is received by the market. A serial sponsor with a strong track record can often raise a larger trust at better terms than a first-time sponsor, which is a market-based check on sponsor quality that operates alongside, though separately from, the structural conflict-of-interest problem described above.

Frequently Asked Questions About SPACs

What is a SPAC in simple terms?

A SPAC is a shell company with no operating business that raises money from public investors through an IPO, holds that cash in a trust account, and has a set window of time — usually 18 to 24 months — to find and merge with a private company, effectively taking that company public without a traditional IPO process.

How does the sponsor promote work?

The sponsor promote is typically 20% of the SPAC's post-IPO share count, granted to the sponsor team in exchange for a relatively small amount of at-risk capital used to cover underwriting and search costs. If a merger closes, that 20% stake converts into stock of the combined company, often worth far more than the sponsor's original at-risk capital — which is the core economic engine behind why sponsors are motivated to complete deals.

What happens to shareholders who don't want the merger to go through?

Shareholders can redeem their shares for a pro-rata portion of the trust account in cash, independent of how they vote on the merger itself, and they keep their warrants regardless of whether they redeem. This gives public shareholders a way to exit with their capital largely protected even if they disagree with the deal the sponsor has proposed.

Why do SPAC mergers sometimes need extra financing like a PIPE?

If enough shareholders redeem their shares at the de-SPAC vote, the trust account may no longer hold enough cash to fund the deal as originally structured. A PIPE (private investment in public equity) or a forward purchase agreement raises additional capital from outside investors to fill that gap, allowing the merger to close even with significant redemptions.

How to Structure an Interview Answer on This Topic

Understanding the mechanics above is necessary but not sufficient for answering a SPAC interview question well — interviewers are specifically listening for whether a candidate can quantify the sponsor's economics and articulate the conflict of interest with a reason, not just a label. A full four-step framework for structuring that kind of answer, applied to worked numerical examples, is covered in how to answer SPAC interview questions on sponsor economics and conflicts of interest, which is worth treating as the natural next step after getting comfortable with the structural mechanics covered here.

How SPACs Fit Among the Broader Types of M&A Buyers

A SPAC sponsor is a distinct category of buyer that doesn't map cleanly onto the traditional strategic-versus-financial buyer split most candidates learn first. Unlike a strategic acquirer pursuing synergies with an existing business, or a private equity fund raising capital deal-by-deal from limited partners, a SPAC sponsor raises a fixed pool of capital before identifying any target at all, which is precisely what creates the deadline-driven pressure described above. Placing SPACs correctly within the fuller landscape of M&A buyer types — and being able to explain what makes their incentive structure different from either a strategic or a traditional financial buyer — is covered in strategic vs. financial buyer: the three types of M&A buyers.

How SPAC Deal Terms Compare to Other M&A Structures

A SPAC merger shares some structural DNA with other deal mechanics used to bridge valuation or risk gaps between parties, even though the specific problem it solves is different. An earn-out, for instance, defers part of the purchase price and ties it to the target's future performance, addressing a valuation disagreement between a buyer and seller in a private M&A transaction — a mechanism covered in more depth in the earn-out structuring case referenced above, and explained conceptually in what an earn-out is and how it works. A SPAC merger doesn't defer price in the same way, but it does share the property of shifting risk: public shareholders who don't redeem are effectively betting on the combined company's post-merger performance, much like a seller accepting stock consideration in a traditional M&A deal is betting on the acquirer's future share price rather than locking in a fixed cash amount. Recognizing these structural parallels across seemingly unrelated deal types is exactly the kind of connected thinking that helps a candidate answer follow-up questions that ask them to compare and contrast different M&A structures rather than treating each one as an isolated topic.