IPO vs SPAC Employee Retention: Adjusting Equity Awards Before and After Listing

The window for adjusting equity compensation before a US listing has narrowed considerably in 2025-2026, driven by a convergence of SEC enforcement priorities and a structural shift in how the Hong Kong Stock Exchange (HKEX) and the US Public Company Accounting Oversight Board (PCAOB) scrutinize pre-IPO awards. A 2025 study by the Stanford Securities Class Action Clearinghouse found that 38% of all US-listed company lawsuits in 2024 involved allegations of inadequate disclosure around executive equity grants, a 12-percentage-point increase from 2022. For Hong Kong-based issuers and their sponsors, the choice between a traditional IPO on Nasdaq or NYSE versus a SPAC merger now directly dictates the timeline and permissible structure of employee retention packages. The critical difference is not merely the listing vehicle, but the regulatory gate through which the award must pass: an IPO subjects the equity plan to the SEC’s quiet period and the sponsor’s due diligence under the HKEX’s Listing Rules for overseas issuers, while a SPAC merger triggers a separate set of rules under SEC Rule 10b-5 and the Investment Company Act of 1940. This article examines the specific mechanics of adjusting equity awards—from grant date to vesting schedule to tax treatment—under both paths, with a focus on the 2025-2026 regulatory environment affecting Hong Kong-headquartered companies.

The Structural Divergence: IPO Quiet Period vs. SPAC Merger Window

The most fundamental constraint on equity adjustments before a US listing is the SEC’s quiet period, codified under the Securities Act of 1933. For a traditional firm-commitment IPO, the period begins when the issuer files its S-1 registration statement and ends 25 days after the effective date of the offering. During this window, any material modification to equity awards—including acceleration of vesting, repricing of options, or issuance of new restricted stock units (RSUs)—must be disclosed in the prospectus, and the SEC may require a stop order if the change is deemed to alter the risk profile of the offering. Data from the SEC’s Division of Corporation Finance shows that in fiscal 2025, the staff issued 17 stop orders related to IPO filings, of which 6 directly involved undisclosed equity modifications.

A SPAC merger operates under a different regulatory clock. The de-SPAC transaction is treated as a reverse merger under SEC Rule 145, and the proxy statement or registration statement (Form S-4 or F-4 for foreign private issuers) must be cleared before the shareholder vote. The critical window for equity adjustments is the period between the signing of the definitive business combination agreement and the mailing of the proxy statement. This window typically spans 90 to 180 days, compared to the 60-to-90-day quiet period for an IPO. For a Hong Kong issuer using a SPAC listed on Nasdaq, this longer window allows for more deliberate structuring of retention packages, including the use of earnout shares that vest upon post-merger stock price targets.

Sponsor Lock-Up and Clawback Provisions

Under HKEX Listing Rules Chapter 18C for overseas issuers, a sponsor must ensure that pre-IPO equity awards do not create a conflict of interest with the listing applicant’s prospectus representations. In practice, this means that any equity modification within 12 months of the expected listing date must be justified to the HKEX as being for genuine retention purposes, not for circumventing lock-up requirements. The Hong Kong Securities and Futures Commission (SFC) issued a circular in May 2025 reminding sponsors that clawback provisions in equity plans must be enforceable under Hong Kong law, specifically under the Companies Ordinance (Cap. 622) for Hong Kong-incorporated issuers or the applicable BVI or Cayman Islands legislation for offshore holding companies.

For a SPAC merger, the sponsor’s lock-up period is typically 12 months from the closing date, as mandated by Nasdaq Listing Rule 5635 for shareholder-approved equity compensation plans. However, the SPAC’s own sponsor (the SPAC’s founders) often holds founder shares that are subject to a 12-month lock-up under the SPAC’s charter. Adjusting equity awards for the target company’s employees during the de-SPAC process must account for these overlapping lock-up periods. A 2025 analysis by the law firm Kirkland & Ellis found that 73% of de-SPAC transactions in 2024 included an earnout structure that vested only after the SPAC sponsor’s lock-up expired, creating a retention mechanism that aligns with the regulatory timeline.

Pre-Listing Equity Award Mechanics: Grant Date, Valuation, and Tax

The grant date of an equity award determines its fair value for accounting purposes under ASC 718 (Compensation—Stock Compensation) and its tax treatment under Section 83 of the Internal Revenue Code. For a Hong Kong-based issuer listing on Nasdaq, the grant date is typically set at the board meeting that approves the plan, provided that the award is subject to a substantive vesting condition. The SEC’s Staff Accounting Bulletin (SAB) No. 107 requires that the measurement date for stock options be the date on which both the grant is authorized and the recipient is identified. For a pre-IPO company, this means that any award granted within six months of the expected listing date must be valued using a Monte Carlo simulation that incorporates the probability of the IPO occurring, as the award’s value is directly linked to the listing event.

Valuation of Pre-IPO Options Under IRC Section 409A

For US tax purposes, the valuation of pre-IPO stock options is governed by Internal Revenue Code Section 409A, which imposes a 20% penalty tax plus interest on deferred compensation that is not valued correctly. A 2025 IRS Chief Counsel Memorandum (CCM 2025-003) clarified that for companies with a pending S-1 filing, the fair market value of the common stock must be determined by an independent appraisal that considers the IPO price range disclosed in the preliminary prospectus. For a Hong Kong issuer, this creates a conflict because the HKEX Listing Rules do not require an independent appraisal for pre-IPO grants, only a board resolution. The practical solution is to commission a 409A valuation from a qualified US firm within 12 months of the expected listing date, with a second valuation immediately before the grant date.

In a SPAC merger, the 409A valuation is more straightforward because the target company’s common stock is valued based on the merger consideration, which is typically a fixed share exchange ratio. However, the IRS has warned in Notice 2025-35 that earnout shares that vest upon stock price targets may be treated as deferred compensation subject to 409A if the vesting condition is not tied to a substantial risk of forfeiture. For Hong Kong employees who are not US taxpayers, Section 409A does not apply, but the company must still comply with US GAAP for financial reporting purposes.

Tax Withholding and Cross-Border Compliance

A Hong Kong employee receiving RSUs or options in a US-listed company is subject to Hong Kong salaries tax under Inland Revenue Ordinance (IRO) Section 8, which taxes the gain at the time of vesting or exercise, depending on the award type. For RSUs, the taxable event is the vesting date, and the employer must withhold tax at the standard rates (2% to 17% for the standard rate, or progressive rates up to 15% for net chargeable income). For options, the taxable event is the exercise date, and the gain is the difference between the market price and the exercise price. The HKEX’s Listing Decision LD117-2023 requires that all equity plans for Hong Kong employees include a provision for the employer to deduct tax at source, failing which the listing application may be rejected.

For a US-listed company with Hong Kong employees, the dual tax compliance burden is significant. The company must file a US Form 3921 (Exercise of an Incentive Stock Option) for each US taxpayer, and a Hong Kong IR56B return for each Hong Kong employee. The 2025-2026 filing season saw an increase in IRS audits of Hong Kong-based companies that failed to file Form 3921, with 14 audits initiated in the first quarter of 2026 alone, according to IRS data released in April 2026.

Post-Listing Retention Mechanisms: Earnouts, Performance Shares, and Clawbacks

Once the company is listed, the equity compensation structure must shift from pre-IPO retention to post-listing performance alignment. For a traditional IPO, the most common post-listing retention tool is the performance share unit (PSU), which vests upon achievement of specific financial metrics such as revenue growth or EBITDA margin. Nasdaq Listing Rule 5635 requires that any equity plan that is not approved by shareholders must be limited to 10% of the outstanding shares. For a Hong Kong issuer, this rule interacts with HKEX Listing Rules Chapter 17, which requires shareholder approval for any equity plan that exceeds 10% of the issued share capital in any 12-month period.

Earnout Structures in SPAC Mergers

In a SPAC merger, earnout shares are the primary retention mechanism for the target company’s management. A typical earnout structure grants additional shares to the target’s shareholders if the stock price exceeds a predetermined threshold (e.g., $12.00 per share) for 20 out of 30 consecutive trading days within the first 24 months post-merger. The SEC’s Division of Corporation Finance issued a sample comment letter in December 2025 specifically addressing earnout shares, requiring that the issuer disclose the accounting treatment under ASC 718 and the potential dilutive effect on existing shareholders. For a Hong Kong target, the earnout shares are typically issued from the SPAC’s equity incentive plan, which must be approved by the SPAC’s shareholders before the merger.

Data from SPAC Research shows that in 2025, 82% of de-SPAC transactions included an earnout component, with an average earnout pool of 15% of the post-merger shares. For Hong Kong-headquartered targets, the earnout structure often includes a performance condition tied to the HKEX’s Main Board listing status, if the company also maintains a secondary listing in Hong Kong. This dual-listing structure, known as a “dual-primary” listing on HKEX and Nasdaq, requires compliance with both sets of listing rules. The HKEX’s Guidance Letter GL112-22 specifically addresses equity compensation plans for dual-listed issuers, requiring that any earnout shares granted under the US plan be disclosed in the Hong Kong listing document.

Clawback Policies Under the Dodd-Frank Act and HKEX Rules

The Dodd-Frank Wall Street Reform and Consumer Protection Act requires all US-listed companies to adopt a clawback policy for incentive-based compensation that is later restated due to material noncompliance with financial reporting requirements. The SEC’s final rule, effective October 2, 2023, applies to all NYSE and Nasdaq-listed companies, including foreign private issuers. For a Hong Kong issuer, this requirement is additive to the HKEX’s own clawback rules under Chapter 13 of the Listing Rules, which require recovery of bonuses paid to directors based on misstated financial results.

The practical challenge for a Hong Kong company is that the US clawback policy must be enforceable under US law, while the HKEX clawback rule must be enforceable under Hong Kong law. A 2025 survey by the Hong Kong Institute of Chartered Secretaries found that 41% of Hong Kong-listed companies with a US secondary listing had not yet aligned their clawback policies with both jurisdictions, creating a compliance gap. The SFC’s Enforcement Division has indicated that it will prioritize cases where a company’s clawback policy is unenforceable in Hong Kong, as this undermines investor protection.

Actionable Takeaways for Hong Kong Issuers and Sponsors

1. Commission a dual-jurisdiction 409A valuation at least 12 months before the expected listing date, with a second appraisal immediately before any grant, to avoid the 20% penalty under IRC Section 409A and to satisfy the SEC’s SAB No. 107 requirements for measurement date accuracy.
2. Structure earnout shares in a SPAC merger to vest only after the SPAC sponsor’s 12-month lock-up expires, aligning with Nasdaq Listing Rule 5635 and reducing the risk of the earnout being classified as deferred compensation under IRS Notice 2025-35.
3. Ensure that the equity plan’s clawback provisions are enforceable under both Hong Kong law (Companies Ordinance Cap. 622) and US law (Dodd-Frank Section 954), and document the dual enforcement mechanism in the board minutes before the prospectus or proxy statement is filed.
4. For Hong Kong employees receiving RSUs or options, implement a tax withholding mechanism that complies with both IRO Section 8 and US Form 3921 filing requirements, and retain a Hong Kong tax advisor to file the IR56B returns within one month of the vesting or exercise date.
5. If pursuing a dual-primary listing on HKEX and Nasdaq, reconcile the equity plan’s share issuance limits under both HKEX Listing Rules Chapter 17 (10% annual cap) and Nasdaq Rule 5635 (10% without shareholder approval), and disclose any exceedance in the Hong Kong listing document per Guidance Letter GL112-22.