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Ftse 100 and Ftse 250 Index Changes

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Submitted By chcenev
Words 1550
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Thesis Seminar Finance (6314M02343)
Thesis Proposal – First Draft
Chavdar Tsenev, 10840974

Comparative study of abnormal stock performance on announcements of FTSE 100 and FTSE 250 index revisions – is there evidence of inattention for smaller caps?

1. Research Question
Trading strategies that focus on stocks’ inclusion/exclusion in the composition of a major stock exchange index have always been an interesting topic for academic research with high practical application. The highest amount of papers on the subject is focused on the American stock market, and mainly on stock performance in relation to changes in the S&P 500 index constituents.
Unlike the several rules that apply for inclusion in the S&P 500, the criteria for the constituents of the British indices FTSE 100 and FTSE 250 are simpler – the decision is determined only by the market capitalization of the listed companies. Documented studies so far have focused only on stock performance based on inclusion/exclusion in the FTSE 100 – the index, consisting of the top 100 companies in the UK, arranged by market cap. They find an anticipatory effect, which proves to be temporary in contrast to the permanent effect, documented for the S&P 500. A possible explanation is increased investor awareness and monitoring, which accounts for positive prices effects for additions and negative for exclusions.
The idea of my research question is to study the anticipatory effect of stock inclusion/exclusion in the FTSE 100, compared to the FTSE 250, measured by abnormal stock performance. The hypothesis of such an event study is that the anticipatory effect for changes in the FTSE 100 will be higher, due to limited investor attention and lower salience of stocks with smaller market cap, included in the FTSE 250 index.

2. Initial literature review

Generally, the criteria for stock

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