Asymmetry in stock returns following block trades on the Australian Stock Exchange

A note

Michael Aitken, Alex Frino

Research output: Contribution to journalArticle


A number of recent U.S. studies have examined the price impact of large (block) trades using intraday data. A major finding is that the price movement following block trades continues upwards following purchases but reverses following sales. This asymmetry in price behaviour, which suggests that block sellers pay a liquidity premium while block buyers do not, has been described as 'intriguing' and a 'key puzzle'. The purpose of this note is to determine whether the phenomenon exists on the Australian Stock Exchange. Evidence consistent with the 'puzzling' asymmetry is shown to exist when returns are measured from the block trade until the close of trade. Contrary to U.S. findings, which have shown that prices appear to reverse following both block purchases and sales in transaction time analysis, the asymmetry in price behaviour is also demonstrated to exist in transaction returns for the ASX. All results are found to be robust to a number of research design innovations and data partitions.
Original languageEnglish
Pages (from-to)54-61
Number of pages8
Issue number1
Publication statusPublished - 1 Mar 1996
Externally publishedYes

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