Abstract
Firms that change their listing from the less regulated AIM to the more regulated main section of the London Stock Exchange exhibit positive abnormal returns on the announcement day. For firms moving in the opposite direction, both announcement and implementation day abnormal returns are negative. Following implementation, the pattern is reversed for both categories of firm. We show that differences in liquidity, conventional risk factors and in medium to long term firm survival rates between the two listing regimes do not explain the observed patterns of returns, suggesting that the answer lies in the different bonding requirements of the two market segments and an agency risk premium.
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