SPAC IPO Process Explained: S-1, Trust Account, and De-SPAC Merger

The SPAC IPO process runs in two acts over roughly two to three years. First, a sponsor forms a shell company, files a registration statement with the SEC, sells units to the public at $10 each, and parks the proceeds in a trust account. Second, the SPAC hunts for a private company to acquire, negotiates a merger, clears another round of SEC review, holds a shareholder vote, and closes the “de-SPAC” transaction that turns the target into a public company. The SEC’s rules that took effect on July 1, 2024 reshaped the disclosure and liability pieces of that second act, so the process today looks meaningfully different than it did a few years ago.

Sponsor Formation and the Promote

Every SPAC begins with a sponsor, usually a private equity firm, hedge fund, or group of executives with deal experience. The sponsor incorporates the shell, assembles a management team, and funds the early costs before any public money is raised.

The sponsor’s economic hook is the “promote”: a block of founder shares bought for a token amount. A sponsor might pay roughly $25,000 for shares that end up representing about 20% of the SPAC’s outstanding stock after the IPO.¹ Alongside the IPO, the sponsor also buys warrants in a private placement, which funds the SPAC’s operating expenses, legal fees, and deal costs. That money matters because the IPO proceeds in the trust account cannot be used for day-to-day operations.

The sponsor’s combined outlay on founder shares and private placement warrants is its “at-risk” capital. If the SPAC never completes an acquisition, the sponsor loses that investment entirely.²

Filing the S-1 Registration Statement

Before selling anything to the public, the SPAC files a Form S-1 with the SEC. The S-1 covers the offering structure, the management team’s background, risk factors, planned use of proceeds, and the shell’s (very thin) financial statements. Because there’s no operating business to describe, the filing is lighter than a traditional IPO prospectus in some respects, but it still goes through the SEC’s full review-and-comment cycle.³

Counsel responds to staff comments and revises the filing, sometimes through several rounds, until the SEC declares the registration statement effective. Only then can the SPAC sell securities. For the later de-SPAC filing, the SEC now permits nonpublic review of the registration statement where the target would independently qualify to submit a confidential draft, treating the de-SPAC as the functional equivalent of the target’s own IPO.⁴

The IPO: Units, Pricing, and Listing

Once the S-1 is effective, the underwriters run a roadshow. The pitch rests almost entirely on the sponsor’s track record and investment thesis, since there’s no business to evaluate yet.

SPACs almost always price at $10.00 per “unit.” Each unit bundles one share of common stock with a fraction of a redeemable warrant, often one-half or one-third of a warrant.³ The fractional warrant gives IPO investors the right to buy more shares later at a fixed price, typically $11.50, if the merger closes. After a set period, usually 52 days post-IPO, the units split and the shares and warrants trade separately.

The SPAC lists on a major exchange, usually the NYSE or Nasdaq. Exchange rules add their own layer. Nasdaq, for example, requires that at least 90% of gross IPO proceeds go into the trust, that any business combination be approved by a majority of independent directors, and that the post-merger entity meet initial listing standards before closing.⁵

The Trust Account

The trust is what makes a SPAC a SPAC from an investor-protection standpoint. Gross IPO proceeds go into a segregated account invested in low-risk instruments, typically short-term U.S. Treasury obligations.⁶ That money can only be released to fund the approved acquisition or to return cash to shareholders through redemption or liquidation. The sponsor cannot pull from the trust for salaries, rent, or legal bills.

Interest earned on the trust accumulates for shareholders, though a portion may be released to cover the SPAC’s taxes. The practical consequence: a public shareholder’s downside is capped. If you don’t like the proposed deal or the SPAC never finds a target, you can get your money back, roughly $10.00 per share plus a share of the interest.

Finding a Target and the Acquisition Window

The clock starts the day the IPO closes. SPAC governing documents typically allow 24 months to identify and close an acquisition, and some allow up to 36 months.¹ Nasdaq’s listing rules allow up to 36 months from the date the registration statement becomes effective.⁵

If the deal isn’t done by the deadline, the SPAC can seek an extension, which usually requires a shareholder vote. Shareholders typically get the right to redeem on an extension vote, so each extension tends to shrink the trust further. If no extension is approved or the extended deadline passes without a closed deal, the SPAC must dissolve and return the trust funds.

Target size matters too. The target must have a fair market value equal to at least 80% of the net assets held in trust at the time the acquisition agreement is signed.¹ That threshold stops sponsors from grabbing a trivially small business just to keep the promote alive.

PIPE Financing

Redemption rates in recent years have averaged above 95%, meaning most IPO investors cash out before the merger closes. That leaves a funding gap, and PIPE financing fills it. A PIPE, or Private Investment in Public Equity, is a private placement of shares to institutional investors that runs alongside the de-SPAC negotiation. The PIPE commitment and merger agreement are usually announced together.

PIPE investors agree to buy shares at a fixed price months before closing, delivering committed capital that isn’t subject to public redemption. For the target, the PIPE is a backstop: even if most public shareholders redeem, there’s still enough cash to make the deal work. PIPE investors run their own diligence on the target, which gives public shareholders who stay in some market check on valuation.

The Shareholder Vote and Redemption Rights

SPAC investors hold two rights that don’t exist in a traditional IPO. They vote on whether to approve the proposed merger, and they can redeem their shares for a pro-rata slice of the trust account, regardless of how they vote.⁶ An investor can vote yes on the deal and still redeem, pocketing the cash rather than holding stock in the combined company. In practice, most do redeem.

Closing the De-SPAC Merger

Once a target is identified and terms are agreed, the SPAC files either a proxy statement (if it already has the securities authorized) or a new registration statement on Form S-4 (if it’s issuing new securities to the target’s shareholders).⁶ These filings must include the target’s audited financial statements, detailed deal terms, risk factors, and pro forma financials showing the combined entity.

The SEC reviews and comments, which can take months to resolve. Under the 2024 rules, the final disclosure materials must be distributed to shareholders at least 20 calendar days before the shareholder meeting or consent deadline.¹ That window gives investors time to review the deal, vote, and decide whether to redeem.

After the vote and closing, the combined entity files a Form 8-K often called the “Super 8-K.” It covers completion of the transaction, any change in control, the change from shell company status, and updated financial statements. The Super 8-K is due within four business days of closing, with no extensions available for the acquired business’s financials.⁷

What Changed in July 2024

The SEC adopted new rules in January 2024, effective July 1, 2024, that narrowed the gap between de-SPAC transactions and traditional IPOs.⁸ A few changes matter most for anyone trying to understand how the process now works.

Forward-looking projections lost their soft legal cover. The rules eliminated the safe harbor that the Private Securities Litigation Reform Act of 1995 previously extended to forward-looking statements by blank check companies, including SPACs.⁹ Aggressive revenue and growth projections now carry real litigation risk, and SPACs must disclose the material bases and assumptions behind any projections used in the de-SPAC process.

The target is now on the hook for disclosures. In certain de-SPAC structures, the target company must sign the registration statement as a co-registrant, making it jointly liable for the accuracy of what’s filed.⁹ The target’s management and board face personal liability for material misstatements, as they would in a traditional IPO.

The de-SPAC itself is treated as a securities sale to the SPAC’s existing shareholders, triggering the full liability framework that applies to public offerings.⁸ The rules also require enhanced disclosure about sponsor compensation, conflicts of interest, and dilution.

Why Dilution Matters Before You Invest

A dollar in a SPAC IPO does not become a dollar of value in the post-merger company, and the gap is bigger than most retail investors expect.

The sponsor’s 20% promote is the largest piece. If a SPAC sells 80 shares at $10 and the sponsor holds 20 founder shares bought for essentially nothing, there’s $800 in trust spread across 100 shares, so net cash backing each share is $8.00, not $10.00. Warrants dilute further, because each exercised warrant creates a share that wasn’t funded at the full price.¹

Underwriting fees take another bite. SPAC underwriters typically take a smaller upfront commission plus a larger deferred fee that only gets paid if the de-SPAC closes. Combined with the promote and warrants, the cash actually delivered to the target can be meaningfully less than what IPO investors put in. The 2024 rules now require SPACs to spell this out in detail, including a per-share measure of net cash backing each share.⁹ Read that section carefully before deciding whether to hold through the merger or redeem.

1
U.S. Securities and Exchange Commission. Special Purpose Acquisition Companies, Shell Companies, and Projections – Final Rules
2
U.S. Securities and Exchange Commission. SEC EDGAR Filing – SPAC Registered Offerings
3
U.S. Securities and Exchange Commission. Form S-1 Registration Statement – New America Acquisition I Corp.
4
U.S. Securities and Exchange Commission. Enhanced Accommodations for Issuers Submitting Draft Registration Statements
5
Nasdaq. SPAC Listing Guide
6
Investor.gov. What You Need to Know About SPACs – Updated Investor Bulletin
7
U.S. Securities and Exchange Commission. Form 8-K General Instructions
8
U.S. Securities and Exchange Commission. Special Purpose Acquisition Companies, Shell Companies, and Projections
9
U.S. Securities and Exchange Commission. SEC Adopts Rules to Enhance Investor Protections Relating to SPACs, Shell Companies, and Projections