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

The SPAC IPO process runs in stages over roughly two to three years: a sponsor forms a shell company, takes it public at $10 per unit to build a trust account, spends up to 24 or 36 months hunting for a private company to acquire, then puts the proposed merger to a shareholder vote before closing the “de-SPAC” transaction that turns the shell into an operating public company. Each stage carries its own filings, deadlines, and investor rights, and the SEC rewrote large parts of the framework in rules that took effect July 1, 2024.

Stage One: The Sponsor Forms the Shell

A SPAC begins with a sponsor, usually a private equity firm, hedge fund, or group of executives with deal-making experience. The sponsor creates the entity, recruits management, and covers the early costs before any public money arrives.

The sponsor’s core economic stake is the “promote”: a block of founder shares purchased for a token sum. A sponsor might pay as little as $25,000 for shares that end up representing roughly 20% of the SPAC’s outstanding stock after the IPO.¹ That 20% costs almost nothing upfront but can be worth a great deal if a merger closes.

The sponsor also buys warrants in a private placement that closes alongside the IPO. Those proceeds fund the SPAC’s operating expenses, legal fees, and deal costs, because the IPO money going into trust can’t be touched for day-to-day operations. The sponsor’s combined outlay on founder shares and private placement warrants is its “at risk” capital. If no acquisition closes, the sponsor loses all of it.²

Stage Two: Filing the S-1

Before the SPAC can sell anything to the public, it files a Form S-1 registration statement with the SEC. The S-1 sets out the offering structure, the management team’s background, risk factors, use of proceeds, and the shell’s financial statements. Because there’s no operating business yet, the S-1 is lighter than a traditional IPO filing in some respects, but it still goes through a full SEC review-and-comment cycle.³

Counsel responds to SEC comments and revises the filing, sometimes over several rounds, until the registration statement goes effective. Only then can securities be sold. For the later de-SPAC transaction, the SEC now allows nonpublic review of the registration statement where the target would independently qualify for confidential submission, treating the de-SPAC as the functional equivalent of the target’s own IPO.⁴

Stage Three: The IPO Itself

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

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

The SPAC lists on a major exchange, typically the NYSE or Nasdaq. Nasdaq requires at least 90% of gross IPO proceeds to go into the trust account, any business combination to be approved by a majority of independent directors, and the combined post-merger entity to meet initial listing standards before closing.⁵

Stage Four: The Trust Account

The IPO proceeds land in a segregated trust account and get invested in low-risk instruments, usually short-term U.S. Treasury obligations.⁶ That money has only two permitted exits: funding an approved acquisition, or being returned to shareholders through redemption or liquidation. The sponsor can’t tap the trust for salaries, rent, or legal bills.

Interest accumulates for the shareholders’ benefit, though some may be released to cover the SPAC’s tax obligations. The practical effect: a public shareholder’s downside is capped. If you don’t like the eventual deal or no deal ever materializes, you get your money back, roughly $10.00 per share plus a share of the interest earned.

Stage Five: Finding a Target Before the Clock Runs Out

The IPO starts a clock. Governing documents typically give the SPAC 24 months to identify and close an acquisition, though some allow up to 36 months.¹ Nasdaq’s listing rules permit up to 36 months from the effective date of the registration statement.⁵

If time runs short, the SPAC can seek an extension, which usually requires a shareholder vote. Shareholders voting on an extension typically have redemption rights at that moment, so each extension vote tends to shrink the trust further. Without an approved extension, and with no deal by the deadline, the SPAC must dissolve and return the trust funds.

Whatever target the sponsor chooses must have a fair market value equal to at least 80% of the net assets in the trust at the time the acquisition agreement is signed.¹ The threshold blocks sponsors from acquiring some trivially small business just to keep the promote alive.

Stage Six: The Vote and the Redemption Right

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 cash out.

That combination has made redemption the dominant outcome. Average redemption rates now exceed 95%, meaning nearly all IPO investors take their cash back before the merger closes. When almost everyone redeems, the SPAC is left with a fraction of its original trust, which opens a serious funding gap that the sponsor and target have to close some other way.

Stage Seven: PIPE Financing Fills the Gap

With redemptions routinely above 90%, the trust alone rarely covers the deal and the target’s growth plans. A PIPE, or Private Investment in Public Equity, is a private placement of shares to institutional investors that runs alongside the merger negotiation. The PIPE commitment and the merger agreement are usually announced together.

PIPE investors agree to buy shares at a fixed price months before the deal closes, providing committed capital that isn’t subject to public shareholder redemption. For the target, the PIPE acts as a backstop: even if most public shareholders cash out, there’s still funding to make the merger work. PIPE investors do their own due diligence on the target, which functions as a market check on the deal’s valuation.

Stage Eight: The De-SPAC Merger

Once a target is picked and terms are agreed, the SPAC announces the business combination and files either a proxy statement or a new Form S-4 registration statement with the SEC, depending on whether new securities are being issued to the target’s shareholders.⁶ These filings must include the target’s audited financials, detailed deal terms, risk factors, and pro forma financial information for the combined entity.

SEC review can take several months. Under the 2024 rules, the final disclosure materials have to reach shareholders at least 20 calendar days before the shareholder meeting or consent deadline.¹ That window is what gives investors time to review, vote, and decide whether to redeem.

After the vote and closing, the combined company files a Form 8-K, commonly called the “Super 8-K,” as its coming-out disclosure. It covers deal completion, any change in control, the exit from shell company status, and updated financial statements, and it must be filed within four business days of closing with no extensions available for the acquired business’s financials.⁷

What Changed Under the SEC’s 2024 Rules

The SEC adopted new SPAC rules in January 2024, effective July 1, 2024. The goal was to close the gap between de-SPAC transactions and traditional IPOs, which had long carried stronger investor protections.⁸

The rules eliminate the safe harbor that the Private Securities Litigation Reform Act of 1995 previously gave forward-looking statements by blank check companies, including SPACs.⁹ Before this change, SPACs could include aggressive revenue and growth projections in merger materials with relatively limited legal exposure. Now those projections carry real litigation risk, and the rules require disclosure of all material bases and assumptions behind them.

The target company must sign the registration statement as a co-registrant in certain de-SPAC structures, making it jointly liable for the accuracy of disclosures.⁹ Previously the target could sit behind the SPAC’s disclosures without the same legal responsibility. Under the new regime, the target’s management and board face personal liability for material misstatements, the same way they would in a traditional IPO.

The rules also treat the de-SPAC itself as a sale of securities to the SPAC’s existing shareholders, which triggers the same liability framework that applies to public offerings.⁸ On top of that, the SEC now demands enhanced disclosures about sponsor compensation, conflicts of interest, and dilution.

The Dilution Reality

Every dollar invested in a SPAC IPO does not translate into a dollar of value in the post-merger company. This is the single most important thing for a SPAC investor to grasp.

The 20% promote is the largest source of dilution. If a SPAC sells 80 shares at $10 in the IPO and the sponsor holds 20 founder shares acquired for essentially nothing, the SPAC has $800 in cash spread across 100 shares. Net cash backing each share is $8.00, not $10.00. Warrants issued to both IPO investors and the sponsor dilute further, because each exercised warrant creates a new share that wasn’t funded at the full price.¹

Underwriting fees take another bite. SPAC IPO underwriters typically get an upfront commission plus a larger deferred fee paid only if the de-SPAC closes. The structure aligns the underwriter with deal completion, but the total fees still reduce cash available for the acquisition. Stack the promote, warrants, and fees together and the cash actually delivered to the target can be meaningfully less than what IPO investors put in. The 2024 rules now require SPACs to disclose dilution in granular detail, including a per-share measure of net cash backing each share.⁹

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