SEC Rule 155

Rule 155 was formally removed from the Code of Federal Regulations effective March 15, 2021, when the comprehensive new Rule 152 — adopted as part of the Facilitating Capital Formation and Expanding Investment Opportunities rulemaking, Securities Act Release No. 33-10884, 86 FR 3594 — absorbed Rule 155's two safe harbor scenarios into its unified, offering-type-neutral integration framework, specifically within Rule 152(b)(3)'s registered offering following exempt offering safe harbor. 

Understanding Rule 155's former framework is nonetheless essential to practitioners and examination candidates, both because the policy rationale and specific conditions it embodied continue to inform the application of Rule 152(b)(3), and because Rule 155 is frequently referenced in legal commentary, continuing legal education materials, and securities law texts whose currency predates the 2021 framework consolidation.

Overview and Regulatory Purpose

The abandoned offering integration problem that Rule 155 addressed was a practical capital formation challenge of significant commercial consequence. An issuer that embarked on a private placement — conducting a Regulation D offering under Rule 506(b) through a private placement memorandum distributed to institutional investors — might find, after investing substantial time and resources in the private offering process, that market conditions had changed, investor appetite was insufficient, or the transaction's terms required reconsideration. 

If the issuer then decided to abandon the private placement and instead pursue a registered public offering, the critical question was whether the prior private placement efforts — the distribution of offering materials, the investor solicitation, and the conditioning of the market through disclosure of the offering's terms — would be integrated with the proposed public offering, potentially rendering the public offering invalid because the prior solicitation had been directed at persons who would not qualify as accredited investors under the registered offering's exemptive requirements, or had been conducted in a manner inconsistent with the Section 5 framework applicable to registered offerings.

Conversely, an issuer that had filed a registration statement and was proceeding toward a public offering might find that adverse market conditions, regulatory concerns, or changed business circumstances required withdrawal of the registration statement. If the issuer then sought to raise capital through a private placement — distributing offering materials to institutional investors without the full registered disclosure that the withdrawn registration statement would have required — the question was whether the prior public offering process, with its filing of a registration statement containing substantive disclosure about the issuer's business and financial condition, would be integrated with the private placement, potentially tainting the private offering's exempt status by treating investors who saw the registration statement as having been solicited through a public offering process.

Rule 155 addressed both scenarios through objective, conditions-based safe harbors that provided issuers with a clear framework for establishing a clean break between the abandoned offering and the subsequent offering. Its absorption into Rule 152(b)(3) in 2021 preserved the substance of these safe harbors within the broader, unified integration framework, without altering the underlying policy rationale or the specific conditions that Rule 155 had developed over its two decades of operation.

Statutory Authority and Rulemaking History

Rule 155 was derived from the same statutory authority as the integration doctrine generally — Sections 3(b), 4(a), and 19(a) of the Securities Act — which together authorise the Commission to prescribe rules defining when multiple offerings will be treated as a single offering for registration and exemption purposes. The rule was adopted January 26, 2001, effective March 7, 2001, following a lengthy rulemaking process that included a 1997 release and a 1998 proposing release that had attracted extensive public comment. 

Prior to Rule 155, no clear regulatory framework addressed the abandoned offering integration scenarios the rule was designed to resolve, leaving issuers and their counsel to rely on a patchwork of informal staff guidance, no-action letters, and the general five-factor integration analysis whose application to abandoned offering scenarios was frequently contested and uncertain.

The Commission's adoption of Rule 155 acknowledged that the prior framework had created practical obstacles to legitimate capital formation by introducing unnecessary uncertainty into the transitioning process between offering types, discouraging issuers from exploring the most appropriate capital formation pathway for their specific circumstances because of the risk that an abandoned attempt through one pathway would contaminate a subsequent attempt through a different one. 

Rule 155 was designed to eliminate this disincentive by providing issuers with objective conditions they could satisfy to establish the clean break necessary to transition between offering types without integration risk.

Rule 155 operated for twenty years as the primary rule governing abandoned offering integration before its removal in March 2021. The Commission's 2020 Facilitating Capital Formation rulemaking determined that Rule 155's safe harbors could be absorbed into the new Rule 152's unified integration framework without loss of their substance, and that maintaining Rule 155 as a standalone provision alongside the new Rule 152 would create redundancy and potential confusion about the applicable integration standard. Rule 155 was therefore formally removed from the CFR simultaneously with Rule 152's adoption.

Key Provisions and Former Operative Requirements

Rule 155 contained two distinct safe harbors, each addressing one direction of the abandoned offering transition scenario.

Rule 155(b) — the registered offering following abandoned private offering safe harbor — provided that offers and sales in a registered offering that follows an abandoned private offering would not be integrated with the private offering if: the issuer had not sold any securities in the private offering; the issuer and any person acting on its behalf had not made any offers in the private offering after the registration statement was filed; at the time of the first sale in the registered offering, at least thirty calendar days had elapsed since the termination of all efforts by the issuer to make offers or sales in the private offering; and the prospectus included in the registration statement disclosed specified information about the prior private offering and its abandonment.

The required prospectus disclosure was the most operationally distinctive condition of Rule 155(b), requiring the prospectus to identify the private offering, state that the issuer had abandoned it, specify the number of persons to whom the issuer had made offers in the private offering, state that the registered offering had commenced at least thirty calendar days after all offering efforts in the private offering had ceased, and confirm that no investors who had received offering materials in the private offering had become investors in the registered offering in a manner that would compromise the clean break the safe harbor requires. 

This disclosure requirement served both an investor protection function — alerting registered offering investors to the issuer's prior abandoned private offering attempt and providing context for the transition — and a regulatory accountability function, creating a documented record of the issuer's compliance with the safe harbor's conditions.

Rule 155(c) — the private offering following abandoned registered offering safe harbor — provided that offers and sales in a private offering would not be integrated with a prior registered offering if the issuer had withdrawn the registration statement before any securities were sold, the registration statement had not been effective, and certain additional conditions were satisfied. 

These included: the issuer had not made any offers pursuant to the registration statement other than through the filing of the registration statement itself or any pre-effective amendment; the issuer had withdrawn the registration statement before any sale of securities thereunder; and the prospectus had disclosed that the issuer might undertake a subsequent private offering following withdrawal of the registration statement.

Scope of Application and Current Status

Following Rule 155's removal in March 2021, the integration analysis for both of the scenarios Rule 155 had specifically addressed — registered offerings following abandoned private offerings, and private offerings following withdrawn registration statements — is now conducted under Rule 152's unified framework, primarily through Rule 152(b)(3)'s registered offering following exempt offering safe harbor.

Rule 152(b)(3) provides that a registered offering will not be integrated with any prior exempt offering if the prior offering was a terminated or completed offering for which general solicitation was not permitted, or a terminated or completed offering for which general solicitation was permitted that was made only to qualified institutional buyers and institutional accredited investors, or an offering for which general solicitation was permitted that terminated or was completed more than thirty calendar days prior to the commencement of the registered offering. 

This structure substantially preserves the safe harbor logic of Rule 155(b) — the registered offering following abandoned private offering scenario — within Rule 152(b)(3)'s broader framework, while the general principle of Rule 152(a) addresses the more complex scenario of a private offering following a withdrawn registration statement where the specific conditions of any Rule 152(b) safe harbor may not be satisfied.

Practitioners navigating abandoned offering scenarios under the current Rule 152 framework should treat the conditions and policy rationale that Rule 155 embodied as a strong interpretive guide to the application of Rule 152(b)(3) to the specific subset of integration scenarios involving prior abandoned offerings — the Commission's adopting release for the 2021 rulemaking specifically confirmed that Rule 152(b)(3) was designed to be consistent with former Rule 155's safe harbors, and that the substance of those safe harbors was intended to be preserved within the new framework.

Relationship to Related Rules and Regulations

The former Rule 155 connected directly to the Securities Act's registration and exemption framework, bridging the gap between the registered offering process governed by Sections 5 through 11 of the Act and the exempt offering framework of Section 3(b) and Section 4(a). Its absorption into Rule 152 reflects the Commission's determination that the integration question it addressed is most coherently resolved within a unified integration framework rather than through offering-type-specific provisions scattered across the rulebook.

Rule 155's thirty-calendar-day clean break condition directly informed the design of Rule 152(b)(1)'s thirty-calendar-day temporal safe harbor — the Commission specifically chose thirty calendar days as the primary integration safe harbor's temporal threshold in substantial part because of the precedent established by Rule 155's use of that same period as the clean break condition for abandoned offering transitions.

The former Rule 155's required prospectus disclosure conditions — requiring the prospectus for a registered offering following an abandoned private offering to disclose the prior private offering's existence, its abandonment, and specified details about the prior offering process — connect to Rule 408's catch-all materiality completeness obligation, which independently requires that any material information necessary to make required statements in a registration statement not misleading be disclosed, and would likely require disclosure of a material prior abandoned offering independent of any specific rule's mandate.

Amendment History and Regulatory Evolution

Rule 155's twenty-year operational history — from its March 2001 adoption through its March 2021 removal — was marked by the rule's successful resolution of the abandoned offering integration problem it was designed to address, without generating significant enforcement controversy or requiring substantive amendment in response to identified compliance failures or changed market circumstances. 

The rule's thirty-calendar-day clean break condition and its required prospectus disclosure framework operated effectively as the primary reference for the specific integration scenarios it addressed throughout the period of its effectiveness.

The decision to remove Rule 155 rather than maintain it alongside the new Rule 152 reflected the Commission's assessment that a single, unified integration rule — applicable across all offering types and all transition scenarios — would better serve the capital formation objectives that both Rule 155 and the new Rule 152 were designed to advance, by providing issuers, counsel, and investors with a single, coherent analytical framework rather than a system in which some integration scenarios were governed by a standalone rule and others by a separate general integration provision.

Enforcement Context and SEC Action Patterns

During Rule 155's period of effectiveness, enforcement activity specifically targeting Rule 155 conditions was limited, reflecting both the rule's objective, conditions-based structure and the relatively low volume of abandoned offering transitions that issuers undertook in circumstances that implicated integration concerns. 

The Division of Corporation Finance addressed Rule 155 compliance questions through comment letter practice in registration statement reviews, where the Division would inquire about prior private offering activity that might implicate Rule 155's conditions when a registration statement was filed within thirty days of the termination of a prior private placement effort, or when the prospectus did not include the disclosure that Rule 155(b) required where an abandoned private offering preceded the registered offering.

Post-Rule 155, the same compliance concerns that the rule's former conditions addressed are now evaluated under Rule 152(b)(3)'s framework, with the Commission's EDGAR monitoring and registration statement review processes serving the same function of identifying potential integration issues that were previously identified through the specific Rule 155 compliance lens.

Examination Relevance and Key Takeaways

Rule 155 is examined at the Series 65 level primarily as historical context for understanding the development of the current Rule 152 integration framework and the specific policy concerns that Rule 152(b)(3)'s registered offering following exempt offering safe harbor was designed to address.

Candidates preparing for the Series 65 examination should be aware that Rule 155 was removed in March 2021 and that the integration analysis for abandoned offering scenarios is now conducted under Rule 152's unified framework, particularly through Rule 152(b)(3).

The policy rationale underlying Rule 155 — providing a clean break between an abandoned offering and a subsequent offering of a different type, through objective temporal separation conditions and required disclosure — continues to inform the application of Rule 152(b)(3) to the specific scenarios that Rule 155 formerly addressed.

The key points to retain are these. Rule 155 provided safe harbors for two abandoned offering integration scenarios: a registered offering following an abandoned private offering required a thirty-calendar-day clean break after all private offering efforts had ceased, no sales in the private offering, and required prospectus disclosure of the prior private offering; a private offering following a withdrawn registration statement required withdrawal before any securities were sold, no offers beyond the registration statement filing itself, and prospectus disclosure of potential subsequent private offering activity.

Rule 155 was adopted January 26, 2001 and formally removed effective March 15, 2021 when its substance was absorbed into the new Rule 152's unified integration framework, specifically within Rule 152(b)(3)'s registered offering following exempt offering safe harbor.

Abandoned offering integration scenarios are now analyzed under Rule 152's general principle and non-exclusive safe harbors, with Rule 155's former conditions continuing to serve as strong interpretive guidance for the application of Rule 152(b)(3) to those specific scenarios.

As of June 2026, Rule 155 remains removed from the Code of Federal Regulations, with no Commission proposal to reinstate it as a standalone provision, and the integration analysis for abandoned offering scenarios continues to be conducted exclusively under the unified framework of Rule 152.