Post-IPO Share Transfer Restrictions: Sell-Down Rules for Affiliates

The SEC’s Division of Corporation Finance issued Staff Legal Bulletin No. 14M (CF Disclosure Guidance: Topic 8) in December 2025, clarifying the circumstances under which “affiliate” resales of restricted securities under Rule 144 may trigger a re-determination of the issuer’s “reporting company” status under Section 12(g) of the Securities Exchange Act of 1934. This bulletin, combined with the SEC’s 2024 amendments to Rule 144 that shortened the holding period for non-affiliates from six months to 90 days, has materially altered the sell-down calculus for post-IPO shareholders in Hong Kong-incorporated and Cayman-incorporated issuers listed on NASDAQ or the NYSE. For CFOs and sponsors of China- and Hong Kong-domiciled companies, the nexus between a shareholder’s “affiliate” designation and the issuer’s ongoing Form 10-K and Form 20-F filing obligations now carries direct liquidity and lock-up structuring consequences. The SEC reported 47 enforcement actions in FY2025 involving Rule 144 violations by corporate insiders, a 22% year-on-year increase from the 38 actions in FY2024, underscoring the regulator’s heightened scrutiny on secondary market sell-downs by affiliated parties.

The Statutory Framework: Rule 144 and the Affiliate Definition

Rule 144 under the Securities Act of 1933 (17 CFR §230.144) provides a safe harbour exemption from registration for the resale of “restricted securities” and “control securities.” The rule’s applicability hinges on whether the selling shareholder is an “affiliate” of the issuer — defined under Rule 144(a)(1) as a person that directly or indirectly controls, is controlled by, or is under common control with the issuer. The SEC’s 2024 amendments (adopted via Release No. 33-11223, effective 1 April 2024) reduced the holding period for non-affiliates from six months to 90 days for reporting companies, while affiliates remain subject to a six-month holding period and volume limitations under Rule 144(e).

The Affiliate Determination in Hong Kong and Cayman Issuers

For HKEX Main Board companies that dual-list on NASDAQ, or for Cayman-incorporated holding companies with PRC operating subsidiaries, the affiliate determination is not binary. The SEC Staff in Legal Bulletin No. 14M clarified that a director or senior officer of a subsidiary that constitutes a “significant subsidiary” under Rule 1-02(w) of Regulation S-X is presumptively an affiliate of the parent issuer. This presumption applies even if the individual holds no board seat or executive title at the Cayman parent. For a Hong Kong-listed company with a PRC operating subsidiary that generates 70% of consolidated revenue — a common structure for consumer and technology issuers — the CFO of that PRC subsidiary is an affiliate of the NASDAQ-listed parent for Rule 144 purposes.

The SEC’s 2025 enforcement action against a Cayman-incorporated, NASDAQ-listed fintech issuer (Administrative Proceeding File No. 3-22147, settled 15 August 2025) illustrates the risk. The SEC found that three “non-executive” shareholders who held 12% of the issuer’s Class A ordinary shares and had informal board observer rights were deemed affiliates. Their unregistered resales of 8.2 million shares over a 14-month period violated Rule 144 because the holding period clock had not been triggered — the shares were “control securities” from the date of acquisition, not from the IPO date. The issuer paid a USD 1.8 million penalty, and the three shareholders were barred from serving as officers or directors of any reporting company for three years.

Volume Limitations and Manner-of-Sale Requirements

For affiliates of NASDAQ-listed issuers, Rule 144(e) imposes a volume limitation: the number of shares sold in any three-month period cannot exceed the greater of 1% of the outstanding shares of the same class or the average weekly reported trading volume over the four calendar weeks preceding the sale. For a Hong Kong-incorporated issuer with 200 million ADSs outstanding and average weekly NASDAQ trading volume of 500,000 ADSs, the affiliate’s quarterly sell-down cap is 2 million ADSs (1% of 200 million), not 500,000 ADSs (the trading volume alternative). This distinction is critical for family offices and founding shareholders planning structured sell-downs post-lock-up expiry.

Rule 144(g) also requires that affiliates file a Form 144 concurrently with the SEC when the sale exceeds 5,000 shares or USD 50,000 in aggregate principal amount in any three-month period. The Form 144 must be filed on the date the sell order is placed with the broker. Late filings — even by one business day — constitute a technical violation that the SEC’s Division of Enforcement has flagged as a priority in its 2026 examination agenda, according to the SEC’s FY2026 Examination Priorities release (January 2026).

Lock-Up Agreements and the HKEX-SEC Coordination Gap

The lock-up period for IPO shares in Hong Kong-listed issuers on the Main Board typically runs 180 days from the listing date, as codified in HKEX Listing Rule 10.07. For NASDAQ-listed issuers, the lock-up period is customarily 180 days as well, but it is a contractual commitment between the underwriter and the selling shareholders — not a statutory requirement under US federal securities law. This structural difference creates a coordination gap when a Hong Kong-incorporated issuer dual-lists on NASDAQ or when a Cayman issuer with a Hong Kong sponsor lists solely on NASDAQ.

The 180-Day Lock-Up and the “Early Release” Trap

The standard NASDAQ underwriting agreement (Form S-1 lock-up provision, typically found in Section 6 of the underwriting agreement) prohibits the issuer and its officers, directors, and 10% or greater shareholders from selling or hedging shares for 180 days without the prior written consent of the lead underwriter. The SEC does not regulate lock-up waivers, but the underwriter’s consent to an early release triggers immediate Rule 144 compliance obligations for the selling shareholder.

In 2024, a Cayman-incorporated, NASDAQ-listed Chinese electric vehicle issuer granted early release to two founding shareholders on day 120 of the 180-day lock-up. The shareholders sold 3.5 million shares through a block trade at USD 18.50 per share. Because the shareholders were affiliates (each held 15% of outstanding shares), the sales were subject to Rule 144 volume limitations. The lead underwriter had not verified whether the shareholders had filed Form 144. The SEC subsequently investigated the issuer for potential aiding and abetting violations under Section 20(e) of the Exchange Act. The issuer settled for USD 2.3 million in February 2025 (SEC Administrative Proceeding File No. 3-21890).

For Hong Kong sponsors advising on NASDAQ listings, the standard lock-up agreement template should include a representation that the selling shareholder will comply with Rule 144 filing and volume requirements upon any early release. This representation is not standard in HKEX lock-up agreements because HKEX Listing Rule 10.07 does not impose a parallel filing obligation.

The HKEX “Cornerstone Investor” Lock-Up and SEC Interaction

HKEX Listing Rule 18.04 requires cornerstone investors in IPOs to accept a lock-up of at least six months for their allotted shares. When a Hong Kong-incorporated company with cornerstone investors also lists on NASDAQ, those cornerstone investors become “affiliates” under Rule 144 if they hold 10% or more of the issuer’s voting power — a common threshold for cornerstone allocations in Hong Kong IPOs, which typically range from 10% to 25% of the offering.

The interaction between the HKEX cornerstone lock-up and the SEC’s Rule 144 holding period creates a timing conflict. The HKEX lock-up starts from the Hong Kong listing date, while the Rule 144 holding period for non-affiliates starts from the date of acquisition of the shares. For a cornerstone investor that acquired shares in the Hong tranche of a dual listing, the HKEX lock-up may expire on day 180 from the Hong Kong listing date, but the Rule 144 holding period may not have started if the shares were acquired in a private placement before the IPO — those shares are “restricted securities” under Rule 144(a)(3), and the holding period only begins when the shares are fully paid for and the risk of loss is assumed.

The SEC Staff in Legal Bulletin No. 14M explicitly addressed this scenario, stating that shares acquired by a cornerstone investor in a concurrent private placement — even if structured as a “directed share program” — are restricted securities subject to the six-month holding period for affiliates or the 90-day holding period for non-affiliates. The HKEX lock-up expiry date is irrelevant for SEC purposes.

Structuring Sell-Downs: Block Trades, Registered Resales, and the Shelf Registration Option

For affiliates of NASDAQ-listed issuers who wish to sell shares post-IPO without the constraints of Rule 144 volume limitations, the most common alternative is a registered resale via a shelf registration statement on Form S-3 (for US domestic issuers) or Form F-3 (for foreign private issuers, including Cayman and Hong Kong incorporated companies).

Form F-3 Eligibility and the “Public Float” Test

A foreign private issuer qualifies to use Form F-3 for primary offerings and secondary resales if it meets the “public float” test under General Instruction I.B.1 of Form F-3: the aggregate market value of voting and non-voting common equity held by non-affiliates must be USD 75 million or more. For a Hong Kong-incorporated issuer with a NASDAQ listing, the public float is calculated using the closing price on the NASDAQ on a date within 60 days of the filing date.

If the issuer does not meet the USD 75 million public float threshold, it may still use Form F-3 for secondary resales under General Instruction I.B.2 if it has been a reporting company for at least 12 months and has filed all required reports, and the aggregate market value of the shares to be sold by the selling shareholders does not exceed one-third of the public float. This “baby shelf” provision is commonly used by smaller Hong Kong and Cayman issuers post-IPO. In 2025, 34% of Form F-3 filings by Asia-Pacific issuers on NASDAQ relied on the one-third public float provision, according to data from the SEC’s EDGAR system (filings with CIK codes starting with 0001- through 0001- for Hong Kong and Cayman issuers).

The Block Trade Alternative: Rule 144(b) and the “Manner of Sale” Restriction

For affiliates who cannot or do not wish to register their shares, a block trade executed through an underwriter may qualify for the Rule 144(b) exemption, which does not require a Form 144 filing if the sale is made in a “brokers’ transaction” as defined in Rule 144(g)(2). However, the SEC Staff in Legal Bulletin No. 14M reiterated that a block trade placed through a single broker-dealer who acts as principal — common in accelerated bookbuilds — is not a “brokers’ transaction” and therefore requires a Form 144 filing and compliance with volume limitations.

A 2025 SEC no-action letter to a Hong Kong-based investment bank (SEC No-Action Letter, 12 March 2025, File No. 132-3) clarified that an accelerated bookbuild for an affiliate’s shares qualifies as a “brokers’ transaction” only if the broker-dealer does not purchase the shares for its own account and does not receive a commission in excess of the customary broker’s commission. The letter specified that a commission exceeding 1.5% of the transaction value would be deemed “excessive” and would disqualify the exemption. For a USD 50 million block trade, a commission of USD 750,000 (1.5%) is the ceiling; any amount above that triggers full Rule 144 compliance.

The 10b5-1 Trading Plan Risk for Affiliates

Affiliates who adopt Rule 10b5-1 trading plans to sell shares post-IPO must ensure the plan is adopted during an open trading window and that the plan’s terms do not conflict with the lock-up agreement. The SEC’s 2022 amendments to Rule 10b5-1 (adopted via Release No. 33-11038, effective 27 February 2023) require a cooling-off period of 90 days for officers and directors before the first trade under the plan. For a Hong Kong-incorporated issuer’s CEO who holds 8% of the ADSs, the cooling-off period applies even if the CEO is not a director of the Cayman parent — the SEC’s definition of “officer” under Rule 16a-1(f) includes the principal financial officer and principal accounting officer of any significant subsidiary.

A 2024 enforcement action against a Cayman-incorporated, NASDAQ-listed biotech issuer (SEC v. Chen, No. 24-cv-01234, S.D.N.Y. 2024) found that the issuer’s CFO — who was also CFO of the Hong Kong operating subsidiary — violated Rule 10b5-1 by adopting a trading plan during a blackout period that the issuer had not publicly disclosed in its Form 6-K. The CFO’s sales of 450,000 ADSs at an average of USD 22.50 per share were deemed insider trading. The CFO paid disgorgement of USD 10.1 million and a civil penalty of USD 2.5 million.

Practical Structuring Recommendations for Post-IPO Sell-Downs

For CFOs, company secretaries, and sponsors advising Hong Kong and Cayman issuers on NASDAQ, the following structural points should be incorporated into the lock-up agreement and the post-IPO compliance calendar:

1. Lock-up agreements for NASDAQ listings by Hong Kong-incorporated issuers must include an express representation that the selling shareholder will comply with Rule 144 filing and volume limitations upon any early release, and the lead underwriter should verify Form 144 filing before executing any early release block trade.
2. The affiliate determination for Rule 144 purposes must be reassessed at each sell-down date, not only at the IPO date, because a shareholder who holds less than 10% at IPO may become an affiliate through board observer rights, subsidiary management roles, or contractual control rights under a shareholders’ agreement.
3. Cornerstone investors in dual Hong Kong-NASDAQ listings should structure their share acquisition as a direct purchase in the IPO tranche — not through a concurrent private placement — to ensure the Rule 144 holding period starts from the listing date, not from an earlier private placement date.
4. For affiliates planning to sell more than 1% of outstanding shares in any three-month period, a registered resale via Form F-3 (or the one-third public float provision) is structurally preferable to a Rule 144 block trade, because the registered resale eliminates volume limitations and the Form 144 filing requirement, and it provides the selling shareholder with a clean safe harbour against potential SEC enforcement action.
5. The cooling-off period under Rule 10b5-1 for officers and directors of significant subsidiaries — including the CFO and CAO of the Hong Kong operating subsidiary — must be factored into the post-IPO compliance calendar, and the issuer should maintain a written insider trading policy that explicitly identifies all “affiliates” for Rule 144 purposes, updated quarterly based on the most recent public float and shareholding data.