Block trades vs accelerated bookbuilds
When a major shareholder needs to reduce or fully exit a listed position, two primary execution mechanisms exist: the block trade and the accelerated bookbuild. Understanding their structural differences is essential before selecting an approach.
Defining the block trade
A block trade is a privately negotiated transaction in which a single buyer — typically a principal acting from its own balance sheet — purchases a large parcel of shares directly from the seller at an agreed price. The transaction settles bilaterally, away from the open market. Speed and certainty of execution are the defining characteristics: the seller knows immediately whether the transaction is done and at what price. Black Haven operates as that principal buyer, taking the line onto its own book and bearing the market risk from the moment of agreement. There is no syndication, no roadshow, and no dependence on third-party demand. For shareholders who value discretion and finality above all else, this bilateral structure is frequently the preferred route.
How an accelerated bookbuild works
An accelerated bookbuild, sometimes called an ABB, is an intermediated process in which an investment bank or broker solicits demand from a range of institutional investors over a compressed period — typically a few hours during the Asian, European, or North American trading session. The final price is set once the book is covered, and shares are allocated across multiple buyers. Unlike a block trade, execution is not guaranteed at the outset: the transaction depends on sufficient institutional appetite at an acceptable clearing price. The bookrunner acts as agent or underwriter, not as permanent buyer of last resort. The seller accepts some price uncertainty and execution risk in exchange for the potential to achieve a price closer to the prevailing market level.
Key structural differences
The most important distinction between the two mechanisms is certainty. In a block trade executed by a principal such as Black Haven, the seller obtains a firm bid at a defined price and the trade is complete. In a bookbuild, the price range and final allocation remain open until the book closes. A second distinction is confidentiality: a bookbuild by definition involves multiple institutional parties and a period of market solicitation, which can move the underlying share price before execution. A bilateral block trade can be agreed and settled with minimal market footprint. Finally, speed differs materially: a block trade can be agreed in hours, whereas a bookbuild — even an accelerated one — requires a market window and sufficient liquidity to attract adequate demand.
Choosing between the two approaches
The choice between a block trade and a bookbuild depends on several factors: the size of the parcel relative to average daily trading volume, the seller’s tolerance for price uncertainty, the sensitivity of the position, and the timing constraints in play. For sellers with a large concentration in a less liquid stock, or where market impact is a serious concern, a block trade with a single principal buyer may offer the best outcome even if the achieved price involves a larger discount than a bookbuild might theoretically deliver. For sellers with time to run a process and positions in highly liquid large-cap names, a bookbuild can be competitive. Black Haven engages with both scenarios and provides a direct principal price where appropriate.
The role of a principal lender in block liquidity
Black Haven’s position as a principal — not a broker or intermediary — changes the nature of the conversation for a selling shareholder. When Black Haven provides a price for a block, it does so as the ultimate risk-taker, with no requirement to re-sell the position before the transaction closes. This gives the seller a single counterparty, a single negotiation, and a defined outcome. Shareholders considering a block sale are encouraged to approach Black Haven early in the process, before committing to any public or semi-public bookbuild exercise, in order to assess whether a bilateral transaction offers a more favourable combination of price, certainty, and discretion.
Frequently asked.
01Can Black Haven purchase a block even if the stock is not highly liquid?
02How quickly can a block trade be agreed and settled?
03Does a block trade always involve a discount to the prevailing market price?
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