Term · Liquidity & Trading

Off-Book Trading

SpecialistAlso: Over-the-counter trading (OTC), off-order-book trading

In briefOff-book trading refers to transactions outside the central order book, for example bilaterally or via internalisers, which are often only reported afterwards. For small stocks, the visible order book can therefore give a distorted picture of the true liquidity.

Definition

Off-book trading refers to securities transactions concluded outside an exchange's central order book, for example bilaterally between two parties or via systematic internalisers. The transactions are often only reported afterwards and do not appear in the ongoing order book price formation. In the EU, post-trade transparency is subject to the requirements of MiFID II/MiFIR.

Why it matters for small caps

For nano and micro caps, a large part of the volume can run off-book, so that the liquidity visible in the order book over- or understates the actual tradability. This makes it harder to assess spreads and market depth.

Common misreadings

Off-book volume is often equated with dark, suspicious activity, even though it is usually regularly reported bilateral transactions.

In the process

→ Used in Step 6 – Portfolio & monitoring

Frequently asked

Is off-book trading the same as a dark pool?

Not quite. Dark pools are a special form of off-book trading in which orders are not visible before execution. Off-book trading also includes bilateral and internalized transactions.

Are off-book transactions published?

Yes, in the EU there is a post-trade transparency obligation under MiFIR, although delays are possible depending on the instrument and size.

Why does this matter for small stocks?

Because a high off-book share means that the liquidity visible in the order book reflects only part of the market and execution risks are harder to assess.

Sources

Primary

EUR-Lex – MiFIR (Verordnung (EU) Nr. 600/2014)
https://eur-lex.europa.eu/legal-content/DE/TXT/?uri=CELEX:32014R0600

Category: Liquidity & Trading · Trading Venues & ExecutionRelevance: SpecialistJurisdiction: EU

Education only, not investment advice. Ranges and thresholds are didactic orientation values, not an official standard.