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Accelerated bookbuild meaning
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What does Accelerated bookbuild mean?
An accelerated bookbuild (ABB) is a rapid equity placing by a listed company or selling shareholder, executed by investment bank bookrunners with minimal marketing, typically after market close and completed overnight or the same day. It is a market practice term, not defined in legislation or case law.
Following an announcement (and, where needed, prior wall‑crossing/market sounding), the bookrunners take legally binding orders from institutional investors—often by telephone and confirmed by placing letters or subscription agreements—build a book, set price and allocations, and then announce the results. Settlement follows on the usual timetable.
Key legal features include: reliance on shareholder authorities and disapplication of statutory pre‑emption rights (or equivalent mechanisms) for non‑pre‑emptive issues; use of prospectus exemptions under the applicable UK or Irish prospectus regime (commonly offers limited to qualified/institutional investors); and compliance with disclosure and inside‑information controls under UK MAR/EU MAR.
Usage and legal treatment are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, including on the London Stock Exchange and Euronext Dublin. ABBs are used for primary issues and secondary sell‑downs, offering speed and reduced market and execution risk compared with fully marketed offerings.
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View the related Practice Notes about Accelerated bookbuild
PRACTICE NOTES
UK equity secondary fundraisings (pre-2026 regime): placings, rights issues and open offers—prospectus triggers, shareholder approvals, pre-emption, pricing, timetable, MAR/Takeover Code, and AIM/Main Market rules
STOP PRESS : Significant reforms to the UK prospectus regime came into effect on 19 January 2026. The fresh rules that govern public offers of securities and admissions to trading in the UK are primarily contained in the Public Offers and Admissions to Trading Regulations 2024, SI 2024/105 (the POATRs), and in the FCA sourcebook, The Prospectus Rules: Admission to Trading on a Regulated Market (PRM). The UK Prospectus Regulation and the FCA Prospectus Regulation Rules are revoked. The changes aim to streamline capital raising and markedly cut the instances when a company must publish an FCA-approved prospectus for a further share issue. For full details of the changes, see Practice Note: UK prospectus regime reform. This Practice Note reflects the regime in place before 19 January 2026. It considers the principal issues that arise when an existing listed or AIM UK company plans to conduct a secondary offer, such as a placing, rights issue or open offer, to raise additional capital. What is a secondary offer? ...
22 May
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PRACTICE NOTES
UK equity capital markets glossary: UK Listing Rules, DTR, UK MAR, UK Prospectus Regulation, AIM Rules, London Stock Exchange standards and practice, updated for 2024 reforms
A Term Definition ABI See Association of British Insurers. Accelerated bookbuild or ABB A method for swiftly allocating shares to investors following the fundraising announcement, with minimal or no marketing. After the announcement, brokers/investment banks secure binding telephone commitments from investors to subscribe for shares, and the fundraising commonly completes the same day it is announced. Admission Generally, the entry of securities to trading on an exchange. More specifically, it refers to: (1) admission of securities to trading on AIM; or (2) admission of securities to trading on the Main Market and to listing on the Official List. See also admission to listing and admission to trading. Admission and disclosure standards The London Stock Exchange rulebook for companies with securities admitted to trading on its markets (excluding AIM) or seeking such admission. Admission document A document that must be published under Rule 3 or Rule 27 of the AIM Rules when a company...
22 May
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