Investors and IPO Demand

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United States · IPO Data

Investors and IPO Demand

Anyone can read a U.S. IPO prospectus for free on EDGAR, but not everyone can be shown the offering or buy it at the offering price. Federal law separates the two: a sequence of named prospectus-access obligations governs which document reaches an investor and when, while the earliest gauging of demand is addressed to qualified institutional buyers and institutional accredited investors, and the allocation of shares is left to the underwriters.

Each section answers one question, with every fact mapped to a named primary authority and linked for verification.

Can any member of the public read an IPO prospectus, and what does it cost?

Yes, and it costs nothing. The SEC's Search Filings page states that the Electronic Data Gathering, Analysis, and Retrieval (EDGAR) system offers 'free public access to millions of informational documents filed by publicly traded companies and others,' and the SEC's About EDGAR page states that access to EDGAR's public database is free. A company's IPO registration statement, and the prospectus inside it, are filed on EDGAR and can be read by anyone — with no account, no fee, and no relationship with the company or any underwriter.

Access to the document is separate from access to the shares. Reading the prospectus on EDGAR requires nothing of the reader; being allocated shares at the offering price depends on the underwriters' distribution decisions, addressed further down this page. The SEC's Office of Investor Education and Advocacy states in its Updated Investor Bulletin: Investing in an IPO that a company's Form S-1 and its amendments — denoted S-1/A — are filed with the SEC and publicly available through EDGAR, and that a reader should check that they are referring to the company's most recent filing 'because the contents of the prospectus may be revised during the course of the registration process.' The About EDGAR page carries the date April 23, 2024 and states 'Last Reviewed or Updated: Nov. 28, 2025.' Where the data behind the IPO market comes from — the index files, the structured datasets, the APIs — is a separate subject, covered on the IPO Market Data page; 1BusinessWorld's live Global IPO Intelligence feed at /ipo-center/ipo-intelligence/ surfaces current registered IPO filings from this same public record as they occur.

Source: SEC — Search Filings (EDGAR public access); SEC — About EDGAR (dated April 23, 2024; last reviewed or updated Nov. 28, 2025) ↗

Which prospectus is the one an investor is actually sold on, and how is it identified on EDGAR?

Two different documents circulate. Before pricing, the prospectus an investor can read is the preliminary prospectus carried inside the Form S-1 or its amendments (S-1/A). After the registration statement is declared effective, the SEC's Updated Investor Bulletin: Investing in an IPO states that the company 'will typically file a final prospectus—usually identified as a 424B3 or 424B4 filing in the EDGAR database,' and that the final prospectus 'generally includes information related to the final offering price that is not available at the time the preliminary prospectus is distributed.'

For an investor, the practical consequence is that the EDGAR form type identifies which document is which: S-1 and S-1/A carry the preliminary prospectus; a 424B filing carries the prospectus that meets Section 10(a) of the Securities Act and governs the completed sale. The legend and content rules that make the preliminary prospectus a 'red herring,' and the mechanics by which price is omitted from the registration statement at effectiveness and then supplied in the Rule 424(b) filing, are the subject of the Waiting-Period Communications and Bookbuilding and Pricing pages respectively; this page addresses only which document an investor can obtain, and when.

Source: SEC / Investor.gov — Updated Investor Bulletin: Investing in an IPO (Oct. 14, 2022) ↗

Must a broker-dealer put a preliminary prospectus in an investor's hands before confirming an IPO sale?

Yes. Exchange Act Rule 15c2-8(b) requires a broker or dealer participating in a distribution to deliver a copy of the preliminary prospectus to any person who is expected to receive a confirmation of sale at least 48 hours prior to the sending of that confirmation, where the issuer has not previously been required to file reports under Exchange Act Section 13(a) or 15(d) — the defining condition of an IPO issuer — unless the issuer has been exempted from reporting under Section 12(h).

Rule 15c2-8(a) supplies the enforcement mechanism: it is a deceptive act or practice, as those terms are used in Section 15(c)(2) of the Exchange Act, for a broker or dealer to participate in a distribution of securities with respect to which a registration statement has been filed under the Securities Act of 1933 unless it complies with paragraphs (b) through (h). For this purpose, 'a broker or dealer participating in the distribution' means any underwriter and any member or proposed member of the selling group. Paragraph (b) does not apply to asset-backed securities meeting the requirements of General Instruction I.B.5 of Form S-3, subject to a proviso that applies paragraph (b) to all issuances of asset-backed securities regardless of the issuer's prior reporting status. The SEC's investor bulletin states the same point in plain terms: 'If you buy directly in an IPO you will receive a copy of the prospectus before your broker confirms your sale.' Rule 15c2-8 was adopted at 35 FR 18457 (December 4, 1970) and last amended at 79 FR 57344 (September 24, 2014). Rule 15c2-8 is also treated as a communications rule, from the broker-dealer's side, on the Waiting-Period Communications page; this page takes the investor's side and adds paragraphs (d) and (f) and the interaction with Rule 174.

Source: eCFR — 17 CFR 240.15c2-8(a)-(b) (Exchange Act Rule 15c2-8, Delivery of prospectus) ↗

Can someone who is not a customer request a prospectus, and for how long?

Rule 15c2-8(c) requires a participating broker or dealer to take reasonable steps to furnish, to any person who makes a written request between the filing date and a reasonable time prior to the effective date, a copy of the latest preliminary prospectus on file with the Commission. Rule 15c2-8(d) carries the same duty past effectiveness: reasonable steps to comply promptly with the written request of any person for a copy of the final prospectus, during the period between the effective date and the later of the termination of the distribution or the expiration of the applicable 40- or 90-day period under Section 4(3) of the Securities Act.

In both paragraphs the rule specifies that 'reasonable steps shall include receiving an undertaking by the managing underwriter or underwriters to send such copy to the address given in the requests.' Paragraph (d) adds a point of precision that matters for the length of the window: the 40-day and 90-day periods 'shall be deemed to apply for purposes of this rule irrespective of the provisions of paragraphs (b) and (d) of § 230.174' — so the written-request obligation runs the full statutory period even where Rule 174 shortens or removes a dealer's own delivery duty. Separately, Rule 15c2-8(f) requires the broker or dealer to take reasonable steps to make the final prospectus available to each associated person expected to solicit customer orders after the effective date before any such solicitation, unless a preliminary prospectus that is substantially the same as the final prospectus 'except for matters relating to the price of the stocks' has already been made available.

Source: eCFR — 17 CFR 240.15c2-8(c), (d), (f) ↗

Does the SEC consider whether preliminary prospectuses actually reached the market before accelerating effectiveness?

Rule 460 provides that, pursuant to the statutory requirement that the Commission give due regard to the adequacy of the information respecting the issuer theretofore available to the public when ruling on requests to accelerate an effective date, the Commission may consider whether the persons making the offering have taken reasonable steps to make the information in the registration statement conveniently available to the underwriters and dealers it is reasonably anticipated will be invited to participate in the distribution.

Rule 460(b)(1) states the minimum: distribution, to each underwriter and dealer reasonably anticipated to be invited into the distribution, a reasonable time in advance of the anticipated effective date, of as many copies of the proposed form of preliminary prospectus permitted by Rule 430 as appears reasonable to secure adequate distribution. Rule 460(c) provides that acceleration will not be conditioned on distributing a preliminary prospectus in any state where that distribution would be illegal, or in the specified competitive-bidding, face-amount-certificate, open-end-company, subscription-rights, and Rule 145 situations. Acceleration is a timing decision about the effective date and is not an approval of the offering: the SEC's investor bulletin states that 'the SEC's declaration of effectiveness does not represent an approval of the merits of the IPO or an indication that the information disclosed is complete or accurate.' The acceleration request itself, under Rule 461, is covered on the Bookbuilding and Pricing page. Rule 460 was last amended at 76 FR 71876 (November 21, 2011).

Source: eCFR — 17 CFR 230.460 (Rule 460, Distribution of preliminary prospectus) ↗

Must a final prospectus physically reach the buyer before the shares do?

Section 5(b)(2) of the Securities Act makes it unlawful to carry or cause to be carried through the mails or in interstate commerce a security for the purpose of sale or for delivery after sale 'unless accompanied or preceded by a prospectus that meets the requirements of subsection (a) of section 10.' Rule 172(b) provides that this obligation 'is satisfied if the conditions in paragraph (c) of this section are met' — the treatment commonly called access equals delivery, under which the issuer's filing of the final prospectus with the Commission stands in for physical delivery of a copy to each purchaser.

Rule 172(c) sets three conditions: the registration statement relating to the offering is effective and is not the subject of any pending proceeding or examination under Section 8(d) or 8(e) of the Act; neither the issuer nor an underwriter or participating dealer is the subject of a pending proceeding under Section 8A of the Act in connection with the offering; and the issuer has filed a prospectus with the Commission satisfying Section 10(a), or will make a good faith and reasonable effort to file such a prospectus within the time required under Rule 424 and, if it fails to file timely, files it as soon as practicable thereafter. Rule 172(c)(4) provides that the third condition does not apply to transactions by dealers requiring delivery of a final prospectus under Section 4(3) of the Act. Rule 172 does not apply to offerings of registered investment companies other than registered closed-end companies, to business combination transactions as defined in Rule 165(f)(1), to offerings registered on Form S-8, or to offerings of registered non-variable annuity securities. Rule 172 was adopted at 70 FR 44808 (August 3, 2005) and last amended at 89 FR 60083 (July 24, 2024).

Source: eCFR — 17 CFR 230.172 (Rule 172, Delivery of prospectuses); Securities Act of 1933, Section 5(b)(2) ↗

Are the confirmation and the allocation notice an investor receives themselves prospectuses?

Rule 172(a) exempts two specific communications from Section 5(b)(1) of the Securities Act after the effective date, if the Rule 172(c) conditions are met: written confirmations of sales in a registered offering that contain information limited to that called for in Exchange Act Rule 10b-10 and other information customarily included in written confirmations of sales of securities, which may include notices provided under Rule 173; and notices of allocation of securities sold or to be sold in the offering.

Rule 172(a)(2) draws the boundary of the allocation notice narrowly: it may include information identifying the securities, including the CUSIP number, and 'otherwise may include only information regarding pricing, allocation and settlement, and information incidental thereto.' The effect is that the routine post-pricing paperwork an allocated investor receives is not treated as an offer made by means of a non-conforming prospectus, provided it stays inside those limits. What the underwriters may say to investors before that point — Rule 134 notices, free writing prospectuses, road-show materials — is governed by a separate set of rules covered on the Waiting-Period Communications and IPO Road Show pages.

Source: eCFR — 17 CFR 230.172(a) ↗

What does an investor who buys in the IPO actually receive after the sale?

Rule 173(a) applies in a transaction that represents a sale by the issuer or an underwriter, or a sale where there is not an exclusion or exemption from the requirement to deliver a final prospectus meeting the requirements of Section 10(a) of the Act under Section 4(3) of the Act or Rule 174. In such a transaction it requires each underwriter or dealer selling in the transaction to provide to each purchaser from it, not later than two business days following the completion of the sale, either a copy of the final prospectus or, in lieu of it, a notice to the effect that the sale was made pursuant to a registration statement or in a transaction in which a final prospectus would have been required to be delivered in the absence of Rule 172. Where the sale was by the issuer and was not effected by or through an underwriter or dealer, Rule 173(b) places that responsibility on the issuer.

Rule 173(d) provides that a purchaser may request a copy of the final prospectus from the person responsible for sending the notice if one has not been sent. Rule 173(c) states that compliance with Rule 173 is not a condition to reliance on Rule 172 — the notice duty and the access-equals-delivery treatment are separate. Rule 173(e) exempts the notice itself from Section 5(b)(1) after the effective date. Rule 173 does not apply to transactions solely between brokers or dealers in reliance on Rule 153, to offerings of registered investment companies other than registered closed-end companies, to business combination transactions as defined in Rule 165(f)(1), or to offerings registered on Form S-8. Rule 173 was adopted at 70 FR 44809 (August 3, 2005) and last amended at 85 FR 33353 (June 1, 2020).

Source: eCFR — 17 CFR 230.173 (Rule 173, Notice of registration) ↗

How long does a prospectus keep following the shares into the aftermarket?

Section 4(a)(3)(B) of the Securities Act withholds the dealer exemption from Section 5 for transactions in a security as to which a registration statement has been filed taking place before the expiration of 40 days after the effective date, or 40 days after the security was first bona fide offered to the public after that date, whichever is later — 'or such shorter period as the Commission may specify by rules and regulations or order.' A flush paragraph following clause (C) provides that, with respect to transactions referred to in clause (B), 'if securities of the issuer have not previously been sold pursuant to an earlier effective registration statement the applicable period, instead of forty days, shall be ninety days, or such shorter period as the Commission may specify by rules and regulations or order' — the IPO case. Rule 174(d) is the Commission's exercise of that shortening authority: it sets 25 calendar days after the offering date where the issuer was not subject to Exchange Act Section 13 or 15(d) reporting immediately prior to filing and the security is, as of the offering date, listed on a registered national securities exchange or authorized for inclusion in an electronic inter-dealer quotation system sponsored and governed by the rules of a registered securities association.

Rule 174(d) defines 'offering date' for this purpose as the later of the effective date of the registration statement or the first date on which the security was bona fide offered to the public. Rule 174(b) removes the delivery obligation entirely where the issuer was already a reporting company immediately before filing — which is why the period is a live question in an IPO and not in a follow-on by a seasoned issuer. Rule 174(h) provides that any obligation under Section 4(3) and Rule 174 to deliver a prospectus, other than the blank-check obligation in paragraph (g), may be satisfied by compliance with Rule 172. Rule 174(g) extends the statutory period for a blank check company as defined in Rule 419 until 90 days after funds and securities are released from the Rule 419 escrow or trust account. Rule 174(e) preserves the full Section 4(3) period where the registration statement was the subject of a stop order under Section 8.

Source: eCFR — 17 CFR 230.174 (Rule 174, Delivery of prospectus by dealers); Securities Act of 1933, Section 4(a)(3) ↗

Which investors can be approached before any prospectus exists?

A narrow, institution-only audience. Section 5(d) of the Securities Act permits an emerging growth company, or any person authorized to act on its behalf, to engage in oral or written communications with potential investors 'that are qualified institutional buyers or institutions that are accredited investors, as such terms are respectively defined in section 230.144A and section 230.501(a) of title 17, Code of Federal Regulations,' to determine whether such investors might have an interest in a contemplated securities offering, either before or after a registration statement is filed. Rule 163B (17 CFR 230.163B) extends a comparable accommodation to any issuer, and fixes its audience by naming Rule 144A and an enumerated list of the entity paragraphs of Rule 501(a). Under either provision the audience is institutional: a natural person is not within it, whatever their wealth.

This is the sharpest asymmetry in investor access to an IPO. The earliest stage of demand-gathering is addressed to institutions, is not filed, and is not public; the first document an individual investor can read is the registration statement once it appears on EDGAR. The rule itself — who may rely on it, when, on what conditions, whether the communications must be filed or legended, and the liability that still attaches — is the subject of the Testing the Waters page and is not restated here. Because Section 5(d) and Rule 163B define their audience by reference to Rule 144A and Rule 501(a), the boundary of that audience is a definitional question, addressed in the next section.

Source: Securities Act of 1933 (U.S. GPO compilation, as amended through P.L. 119-27), Section 5(d); eCFR — 17 CFR 230.163B ↗

What makes an institution a qualified institutional buyer or an institutional accredited investor?

Rule 144A(a)(1)(i) defines a qualified institutional buyer to include listed categories of entity — insurance companies, registered investment companies and business development companies, SBICs and Rural Business Investment Companies, state and local employee benefit plans, ERISA plans, certain bank-trusteed trust funds, Section 501(c)(3) organizations, corporations, partnerships, limited liability companies and business trusts, registered investment advisers, and, under Rule 144A(a)(1)(i)(J), any institutional accredited investor as defined in Rule 501(a) of a type not otherwise listed — acting for their own account or the accounts of other QIBs, that in the aggregate own and invest on a discretionary basis at least $100 million in securities of issuers not affiliated with the entity. A registered dealer qualifies at a $10 million threshold under Rule 144A(a)(1)(ii). Rule 501(a) defines accredited investor. Section 5(d) names 'institutions that are accredited investors' as defined in Rule 501(a) generally; Rule 163B(c)(2) is more specific, naming institutions that are accredited investors 'as defined in §§ 230.501(a)(1), (a)(2), (a)(3), (a)(7), (a)(8), (a)(9), (a)(12), or (a)(13)' — the entity paragraphs of the definition, not the natural-person paragraphs.

Note 1 to Rule 144A(a)(1)(i)(J) states that an entity seeking QIB status under that paragraph may be formed for the purpose of acquiring the securities being offered. Rule 144A(a)(1) adds further routes and conditions: a registered dealer acting in a riskless principal transaction on behalf of a QIB; a registered investment company that is part of a family of investment companies owning at least $100 million in securities in the aggregate; any entity all of whose equity owners are QIBs; and banks, savings and loan associations, and foreign equivalents, which must both own and invest at least $100 million on a discretionary basis and have an audited net worth of at least $25 million shown in financial statements dated not more than 16 months before the sale (18 months for a foreign institution). Rule 144A(a)(2) excludes bank deposit notes and certificates of deposit, loan participations, repurchase agreements, securities owned but subject to a repurchase agreement, and currency, interest rate and commodity swaps from the computation; Rule 144A(a)(3) values holdings at cost, except where the entity reports on a market-value basis and no current cost information has been published. Which paragraphs of Rule 501(a) count as institutional for testing-the-waters purposes, and the Note 1 gloss limiting the 'family client' category to institutions, are set out on the Testing the Waters page. Rule 501(a)'s entity categories include banks and savings and loan associations, registered brokers and dealers, registered and certain exempt investment advisers, insurance companies, registered investment companies and BDCs, SBICs and RBICs, state and local government employee plans with total assets over $5,000,000, ERISA plans meeting specified conditions, and Section 501(c)(3) organizations, corporations, business trusts, partnerships, and limited liability companies not formed for the specific purpose of acquiring the securities offered with total assets over $5,000,000. Rule 144A was last amended at 85 FR 64276 (October 9, 2020); Rule 501 at 90 FR 9687 (February 18, 2025); Rule 163B at 85 FR 64276 (October 9, 2020).

Source: eCFR — 17 CFR 230.144A(a)(1)-(3) (qualified institutional buyer); 17 CFR 230.501(a) (accredited investor); 17 CFR 230.163B(c) (audience) ↗

What is an indication of interest from the investor's side, and how binding is it?

It is revocable and it binds no one. Rule 134(d) permits a communication that is accompanied or preceded by a prospectus meeting the requirements of Section 10 of the Act — expressly 'other than a free writing prospectus as defined in Rule 405' — including a price range where required by rule, to solicit an offer to buy the security or to ask the recipient to indicate whether they might be interested in it. It may do so only if the communication carries substantially a prescribed statement, whose operative words for the investor are that no offer to buy can be accepted and no part of the purchase price received until the registration statement has become effective, and that any such offer 'may be withdrawn or revoked, without obligation or commitment of any kind, at any time prior to notice of its acceptance given after the effective date.' So an indication of interest given before pricing commits the investor to nothing, and secures nothing.

Rule 134(e) provides that a Section 10 prospectus included in such a communication remains a prospectus for all purposes under the Act. The full text of the prescribed statement, the conditions on Rule 134 notices, and the circumstances in which the statement may be omitted (including that it need not be included in a communication to a dealer) are set out on the Waiting-Period Communications page. On the underwriters' side, the SEC's Updated Investor Bulletin: Investing in an IPO describes how the responses are used: 'The underwriters of the IPO typically will have obtained "indications of interest" from prospective investors prior to effectiveness and will use this information to recommend a price for the shares to the issuer, who ultimately determines the price of the IPO.' How the compiled indications become the order book, and how that book is used to set the public offering price, is the subject of the Bookbuilding and Pricing page; how the marketing itself is conducted is covered on the IPO Road Show page.

Source: eCFR — 17 CFR 230.134(d)-(e) (Rule 134, Communications not deemed a prospectus); SEC / Investor.gov — Updated Investor Bulletin: Investing in an IPO (Oct. 14, 2022) ↗

Can an individual investor get shares at the offering price?

There is no entitlement. Investor.gov states that 'the underwriters and the company that issues the shares control the IPO process. They have wide latitude in allocating IPO shares. The SEC does not regulate the business decision of how IPO shares are allocated.' It adds that the underwriters, in consultation with the company, decide the basic terms and structure of the offering well before trading starts, 'including the percentage of shares going to institutions and to individual investors,' and that 'most underwriters target institutional or wealthy investors in IPO distributions.' The SEC's investor bulletin states that 'it is often the case that underwriters and dealers will distribute most of the shares in the IPO to their institutional and high net-worth clients, such as mutual funds, hedge funds, pension funds, insurance companies and high net-worth individuals.'

Investor.gov describes the structural reasons: only a limited number of broker-dealers are invited into the underwriting syndicate, some of which may not have individual investors as clients, and syndicate members do not receive equal allocations; when an IPO is 'hot,' demand exceeds the supply of shares and underwriters usually offer those shares to their most valued clients. Its companion page, Initial Public Offerings: Eligibility to Get Shares at Broker-Dealers, states that 'no brokerage firm can guarantee you will be able to purchase shares in an initial public offering (IPO),' that a firm 'may not sell to you IPO shares unless it has determined the investment is suitable for you,' that firms may sell IPO shares only to selected clients — for example customers with certain cash balances, active traders, or subscribers to more expensive premium services — and that some firms impose restrictions on investors who 'flip' or sell their IPO shares soon after trading begins to make a quick profit — a firm may refuse to sell a flipper any other IPOs or prevent them from buying an IPO for several months. Separately, the SEC's Updated Investor Bulletin: Investing in an IPO states that underwriters 'may discourage flipping by refusing to allocate IPO shares to customers who have flipped shares in the past, but the practice of flipping, alone, is not prohibited under the federal securities laws.' The bulletin describes the alternative route: purchasing the shares when they are resold in the public market in the days following the IPO, 'which is more common in the case of individual investors.' Who is barred outright from buying a new issue, under FINRA Rules 5130 and 5131, is covered on the FINRA Corporate Financing Review page.

Source: SEC / Investor.gov — Initial Public Offerings, Why Individuals Have Difficulty Getting Shares; Initial Public Offerings: Eligibility to Get Shares at Broker-Dealers; SEC / Investor.gov — Updated Investor Bulletin: Investing in an IPO (Oct. 14, 2022) ↗

Which prospectus reaches which investor, at what moment, and under whose obligation?

Investor access to the offering document is not one event but a sequence of separate obligations, each with its own trigger, its own audience, and its own named rule. The table maps the moment to the document, the rule, and the person the rule binds. Federal statutes and SEC rules are U.S. Government works in the public domain (17 U.S.C. 105); each row links to the official text.

Moment What the investor can obtain Governing rule Whom it binds Source
Before any filing Nothing is public. Only qualified institutional buyers and institutions that are accredited investors may be contacted to determine whether they might have an interest in a contemplated offering Securities Act Section 5(d); Rule 163B An emerging growth company under Section 5(d), or any issuer under Rule 163B, and persons authorized to act on its behalf Securities Act §5(d) · source
After filing, before effectiveness The preliminary prospectus inside the Form S-1 or S-1/A, free, on EDGAR, with no account and no fee EDGAR public dissemination No investor-side condition SEC — Search Filings · source
After filing, before effectiveness The latest preliminary prospectus on file with the Commission, on written request Rule 15c2-8(c) Any broker or dealer participating in the distribution 17 CFR 240.15c2-8(c) · source
At least 48 hours before a confirmation is sent A copy of the preliminary prospectus, delivered to any person expected to receive a confirmation of sale (issuer not previously reporting) Rule 15c2-8(b) Any broker or dealer participating in the distribution 17 CFR 240.15c2-8(b) · source
Before a salesperson solicits an order Reasonable steps to make the preliminary prospectus, or after effectiveness the final prospectus, available to the associated person before that person solicits the order Rule 15c2-8(e), (f) The broker or dealer whose associated persons are expected to solicit customers' orders 17 CFR 240.15c2-8(e)-(f) · source
Before acceleration of the effective date Preliminary prospectuses distributed in quantity to underwriters and dealers anticipated to be invited into the distribution Rule 460 Persons making the offering (considered by the Commission on an acceleration request) 17 CFR 230.460 · source
On and after effectiveness The final prospectus filed under Rule 424(b), identified on EDGAR as a 424B3 or 424B4 filing and carrying the final offering price Rule 424(b) The issuer SEC Investor Bulletin — Investing in an IPO · source
Carrying or delivery of the security No physical prospectus need precede or accompany the security if the Rule 172 conditions are met — filing with the Commission stands in for delivery Section 5(b)(2); Rule 172(b)-(c) Any person carrying or delivering the security 17 CFR 230.172 · source
With the confirmation A confirmation limited to Rule 10b-10 information and customary content, and an allocation notice limited to identification, pricing, allocation, settlement and incidental information Rule 172(a) Sellers relying on the exemption from Section 5(b)(1) 17 CFR 230.172(a) · source
Within two business days after the sale The final prospectus, or a notice that the sale was made pursuant to a registration statement Rule 173(a)-(b) Each underwriter or dealer selling in the transaction; the issuer if no underwriter or dealer is involved 17 CFR 230.173 · source
Aftermarket, first 25 calendar days (exchange-listed IPO) A prospectus from dealers trading the security, an obligation satisfiable by compliance with Rule 172 Section 4(a)(3); Rule 174(d), (h) Dealers, including underwriters no longer acting as underwriters 17 CFR 230.174 · source
Effectiveness until the later of the end of the distribution or the 40- or 90-day period The final prospectus, on written request, regardless of whether Rule 174 has shortened the dealer's own duty Rule 15c2-8(d) Any broker or dealer participating in the distribution 17 CFR 240.15c2-8(d) · source

Key terms, defined

Access equals delivery (Rule 172)
The treatment under Rule 172(b) by which any obligation under Section 5(b)(2) of the Securities Act to have a Section 10(a) prospectus precede or accompany the carrying or delivery of a security in a registered offering is satisfied if the conditions in Rule 172(c) are met — principally that the registration statement is effective and not subject to specified pending proceedings, and that the issuer has filed, or will make a good faith and reasonable effort to file, the final prospectus within the time required under Rule 424.
Notice of registration (Rule 173 notice)
The notice an underwriter or dealer must provide to each purchaser from it, not later than two business days following completion of the sale, in lieu of a copy of the final prospectus, to the effect that the sale was made pursuant to a registration statement or in a transaction in which a final prospectus would have been required to be delivered in the absence of Rule 172. A purchaser may request a copy of the final prospectus if one has not been sent.
Notice of allocation
A notice of allocation of securities sold or to be sold in a registered offering. Under Rule 172(a)(2) it is exempt from Section 5(b)(1) after the effective date, subject to the Rule 172(c) conditions, and may include information identifying the securities (including the CUSIP number) and 'otherwise may include only information regarding pricing, allocation and settlement, and information incidental thereto.'
Confirmation of sale
The written confirmation of a securities sale. Under Rule 172(a)(1), a written confirmation of a sale in a registered offering that contains information limited to that called for in Exchange Act Rule 10b-10 and other information customarily included in written confirmations — which may include a Rule 173 notice — is exempt from Section 5(b)(1) after the effective date if the Rule 172(c) conditions are met.
48-hour rule (Rule 15c2-8(b))
The requirement that a broker or dealer participating in a distribution deliver a copy of the preliminary prospectus to any person who is expected to receive a confirmation of sale at least 48 hours prior to the sending of that confirmation, where the issuer has not previously been required to file reports under Exchange Act Section 13(a) or 15(d) — the IPO case. Non-compliance with paragraphs (b) through (h) is a deceptive act or practice, as those terms are used in Section 15(c)(2) of the Exchange Act, for a broker or dealer participating in a distribution of securities with respect to which a Securities Act registration statement has been filed.
Prospectus delivery period
The period during which dealers trading a newly registered security must still deliver a prospectus. Section 4(a)(3)(B) of the Securities Act sets 40 days, extended to 90 days where securities of the issuer have not previously been sold pursuant to an earlier effective registration statement, in each case subject to 'such shorter period as the Commission may specify by rules and regulations or order.' Rule 174(d) shortens the period to 25 calendar days after the offering date for a previously non-reporting issuer whose security is listed on a registered national securities exchange or authorized for inclusion in a registered securities association's inter-dealer quotation system as of the offering date.
Qualified institutional buyer (QIB)
Defined in Rule 144A(a)(1) to include specified categories of institution acting for their own account or the accounts of other QIBs that in the aggregate own and invest on a discretionary basis at least $100 million in securities of unaffiliated issuers; a registered dealer qualifies at $10 million; a bank or savings and loan association must also have an audited net worth of at least $25 million. Rule 144A(a)(1)(i)(J) adds, as a further category, any institutional accredited investor as defined in Rule 501(a) of a type not otherwise listed in the definition. Rule 144A(a)(2) excludes specified instruments from the computation and Rule 144A(a)(3) values holdings at cost, subject to a market-value exception.
Institutional accredited investor
An institution that is an accredited investor under Rule 501(a). Section 5(d) of the Securities Act uses the phrase 'institutions that are accredited investors, as such terms are respectively defined in section 230.144A and section 230.501(a).' Rule 163B(c)(2) is more specific, permitting communications with institutions that are accredited investors 'as defined in §§ 230.501(a)(1), (a)(2), (a)(3), (a)(7), (a)(8), (a)(9), (a)(12), or (a)(13)' — the entity paragraphs of the definition. Those categories include, for example, banks and savings and loan associations, registered broker-dealers, registered investment advisers, insurance companies, registered investment companies and BDCs, a state or local employee plan with total assets over $5,000,000, and a corporation, partnership, limited liability company, business trust or Section 501(c)(3) organization with total assets over $5,000,000 not formed for the specific purpose of acquiring the securities offered.
Accredited investor (natural person)
Rule 501(a)(5) includes any natural person whose individual net worth, or joint net worth with a spouse or spousal equivalent, exceeds $1,000,000, excluding the primary residence as an asset and subject to specified treatment of indebtedness secured by it; Rule 501(a)(6) includes any natural person with individual income over $200,000, or joint income with a spouse or spousal equivalent over $300,000, in each of the two most recent years and a reasonable expectation of the same income level in the current year. A natural person meeting these tests is an accredited investor but is not an institution.
Indication of interest
A prospective investor's non-binding response to a solicitation. Rule 134(d) permits a communication accompanied or preceded by a Section 10 prospectus (other than a free writing prospectus as defined in Rule 405) to solicit an offer to buy or ask whether the recipient might be interested, only if it carries substantially a prescribed statement: that no offer to buy can be accepted and no part of the purchase price received until the registration statement has become effective, and that any such offer 'may be withdrawn or revoked, without obligation or commitment of any kind, at any time prior to notice of its acceptance given after the effective date.'

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1BusinessWorld IPO Center, "Investors and IPO Demand." Compiled from U.S. Government primary sources — the Securities Act of 1933 (Sections 4(a)(3), 5(b)(2) and 5(d)) in the U.S. GPO compilation, Securities Act Rules 134, 172, 173, 174, 144A, 501 and 460 and Exchange Act Rule 15c2-8 as published in the eCFR, the SEC's EDGAR public-access pages, and the SEC Office of Investor Education and Advocacy's Updated Investor Bulletin: Investing in an IPO and Investor.gov IPO-eligibility materials — each linked inline. Retrieved 2026-07-16.

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