What Is a SPAC? How a Blank-Check Shell Company Takes a Private Firm Public

A Ticker With No Business and a Price Stuck Near Par

Scroll through a list of tickers on any brokerage screen and a cluster with names like "Acquisition Corp IV" or "Blank Check Holdings" turns up, all trading within pennies of the same low price. Dig into what these companies actually do, and there's no product, no revenue, often barely any employees. Yet dozens of them list every year. This is a SPAC — a Special Purpose Acquisition Company, sometimes called a blank-check company. Where topics like IPO lockup periods or the greenshoe option describe things that happen around a normal initial public offering, a SPAC is a vehicle built to stand in for that entire IPO process on behalf of a company that hasn't gone public yet.

What a SPAC Actually Is — A Company Whose Only Business Is Going Public

A SPAC has no operating business at all. Its entire reason for existing is to find a promising private company within a fixed window and merge with it, effectively handing that private company a public listing. A sponsor — often an investment bank, asset manager, or a team of industry executives — forms the shell, takes it through an IPO, and lists it on an exchange, typically pricing shares low (Korean SPACs, for instance, commonly price at 2,000 won per share). Exchange rules generally require that a large majority of what the IPO raises — 90% or more in Korea's case — be placed into an escrow trust account, invested in safe instruments like term deposits or government bonds, where it sits accruing interest while the sponsor searches for a target.

The appeal for the private company on the other side of that eventual merger is speed. A traditional IPO means filing a prospectus, running investor roadshows, and going through a full listing review from scratch. Merging into a SPAC that's already listed sidesteps a fresh listing review entirely, which is why this route is often described as a form of reverse merger or "back-door listing." A SPAC typically has a fixed window — three years is standard in Korea — to identify a target and get shareholder approval for the merger; because the approval process itself takes time, the practical deadline for actually signing a deal tends to run closer to two and a half years. Miss that window, and the SPAC is flagged as a distressed issue and moves toward delisting and liquidation.

Why the Price Rarely Drops Below the IPO Price — The Trust Account as a Floor

Watch a SPAC's price chart during a quiet period with no merger news, and one pattern stands out: it tends to hover right around its IPO price, rarely drifting far below it. That's a direct consequence of the trust structure. If the SPAC fails to complete a merger within its deadline, it liquidates, and shareholders get back their original investment plus whatever interest has accrued in the trust over that time. In other words, there's a structural floor — in the worst case, holders are made roughly whole — and the market prices that floor in, keeping the shares anchored near it in the absence of other news.

That floor is real, but it's easy to overstate. It protects investors who bought at the IPO price and continue holding through liquidation. Anyone who bought later on the open market at a premium to that price can still lose money, since the liquidation payout reflects the original trust deposit, not whatever price they paid. Holding through to liquidation is also required for the floor to apply at all, and thin trading volume can make it hard to exit exactly when wanted. And the trust's accrued interest rate isn't fixed — it moves with prevailing rates each year, so it's a variable, not a guaranteed yield.

What Happens Once a Target Is Found — Valuing the Merger and the Price Swings That Follow

The moment a SPAC announces it has signed a merger agreement, everything changes. The market stops pricing it as "a shell heading toward liquidation" and starts pricing it as "the vehicle a private company is about to go public through." Most SPAC mergers are structured so the SPAC itself is legally absorbed and the private target inherits the listing, and the central question becomes how to value that target. Unlike the swap-ratio mergers between two already-listed companies, a SPAC's counterparty has no market price to reference at all, so valuers typically fall back on an intrinsic-value approach — a weighted blend of asset value and projected earning power (discounted cash flow-style estimates) — to arrive at a number.

This valuation step is where most of the real risk in SPAC investing concentrates. Because there's no daily market price acting as a check, the number gets negotiated between two parties who both want the deal to close — the SPAC's sponsor and the target's controlling shareholders — and disputes over inflated valuations surface regularly as a result. Regulators do review the valuation methodology after a merger is announced, but that review confirms the calculation was done by an accepted method, not that the underlying growth assumptions will actually hold up. Shareholders who oppose the deal retain an appraisal right similar to the one described in the merger swap-ratio lesson, but exercising it doesn't remove the uncertainty baked into the valuation itself.

Sponsor Incentives — Where Korean and U.S. SPACs Diverge

One variable that's easy to overlook is exactly how the sponsor's own stake is structured, because it shapes what the sponsor is actually incentivized to do. In the typical U.S. structure, sponsors receive "founder shares" — roughly 20% of the company — for a nominal, often token amount of cash. Those shares are worthless unless some merger closes before the deadline. That creates a well-documented pressure to push through a mediocre deal rather than let the SPAC liquidate, since liquidation wipes out the sponsor's cheap stake entirely.

Korea's rules were written with that exact problem in mind. A securities firm acting as sponsor is required to put in real capital — at least 5% of the SPAC's total equity — from formation onward, and that same sponsor leads both the IPO and the search for a target throughout the SPAC's life. Because the stake is paid for in real money rather than acquired for a token sum, a sponsor that forces through a weak deal shares directly in the loss when the stock falls afterward. That structure aligns sponsor and shareholder interests more closely than the U.S. model does, though it doesn't erase the conflict entirely — a sponsor still stands to lose the time and cost already sunk into the listing if the SPAC liquidates without a deal, so pressure to get some merger done before the deadline never fully disappears. In practice, that means evaluating a SPAC means looking not just at whatever target it eventually finds, but at the sponsoring firm's track record: how often its past SPACs actually completed mergers, and how those stocks performed afterward.

A Worked Example

Say SPAC A raises 30 billion won at a 2,000-won IPO price and deposits 90% of that — 27 billion won — into a three-year trust. Recent years have seen Korean SPAC trust deposits earn roughly 3–4% annually as a rough benchmark; assuming about 3.5%, a shareholder who holds through a failed merger and eventual liquidation three years later would receive back roughly 2,210 won per share — the original 2,000 won plus three years of accrued interest. Absent merger news, the market price tends to track close to that expected payout throughout the holding period.

Now suppose, a year into the SPAC's life, it announces a merger with a promising private company. If the market values that target's post-merger market cap well above what the SPAC raised at IPO, the shares can spike to several multiples of the IPO price within days of the announcement. Korean financial media documented exactly this in 2022, when a handful of SPACs jumped from a 2,000-won IPO price into the high-teens-of-thousands or even 20,000-won range within days, before giving much of it back just as fast. That kind of swing reflects short-term supply-and-demand pressure on a thin float of shares far more than it reflects any real change in the target company's underlying value — a stretch that calls for real caution.

Risks Every Investor Should Weigh

SPACs are sometimes pitched as a "safe lottery ticket" that can't really lose money, but that framing glosses over several layers of real risk. Industry figures commonly cited put the merger completion rate below 50%, so the base case for any given SPAC is that it never completes a deal at all. Even when principal and interest are eventually returned, capital sitting idle for up to three years carries a real opportunity cost. Second, even a completed merger is no guarantee: when a target's actual results fall short of the growth assumptions baked into its valuation, the stock frequently trades below the original IPO price after the merger closes. Third, the thin float that produces dramatic spikes on merger news cuts both ways — anyone who buys into that spike is paying well above the trust-backed floor and no longer enjoys its protection. On the flip side, some investors specifically look for SPACs trading below their expected liquidation payout as the deadline approaches, buying into a position with limited downside — though that approach still requires weighing the chance a late merger materializes against the opportunity cost of capital locked up until liquidation.

Key Takeaways

• A SPAC is a shell company with no operating business, existing solely to merge with a private company and take it public within a fixed window — typically three years in Korea.
• Because 90%+ of IPO proceeds must sit in an escrow trust, a structural floor exists: failed mergers return principal plus accrued interest, which keeps the price anchored near the IPO price in quiet periods.
• Once a target is announced, valuing that unlisted company — with no market price to anchor to — becomes the central risk, and inflated valuations are a recurring source of dispute.
• Post-announcement trading often sees sharp, thinly-traded price spikes; buying into those spikes means paying above the trust-backed floor and losing its protection.
• Merger completion rates are commonly cited as below 50%, so approaching a SPAC means assuming liquidation, not a completed deal, is the base-case outcome.

Frequently Asked Questions

Is buying a SPAC essentially risk-free?

Holding from the IPO price through to liquidation gives a strong chance of getting principal and interest back, but that's not an absolute guarantee. Buying above the IPO price on the open market means the liquidation payout may fall short of the purchase price, and the trust's interest rate itself varies year to year. "Limited downside under specific conditions" is a more accurate description than "risk-free."

How is a SPAC merger different from a regular IPO?

A regular IPO requires the company to file its own prospectus and go through a full listing review from scratch. A SPAC merger instead inherits an existing listing by merging into an already-public shell, skipping that fresh listing review — which is why it's generally faster and less procedurally demanding for the private company involved.

What happens if a SPAC can't find a merger target in time?

It gets flagged as a distressed issue and proceeds toward liquidation and delisting. Shareholders who invested at the IPO price typically receive back the trust-held principal plus whatever interest has accrued over the holding period.

Do Korean SPACs come with warrants like U.S. SPACs?

No. U.S. SPACs typically IPO as "units" bundling a common share with a warrant, which can later be split and traded separately. Korean SPACs trade as plain common shares from the IPO onward — there's no separate warrant component, so the optionality that U.S. SPAC coverage often describes doesn't carry over to the Korean structure.

⚠️ This article is for informational and educational purposes only and is not a recommendation to buy or sell any security. The example figures are simplified for illustration; actual trust interest rates, liquidation payouts, and merger terms vary by SPAC and should be confirmed against each company's own disclosures.