The accounting literature has found evidence that acquirers in stock-for-stock M&A have typically managed earnings upwards ahead of a bid. Other literatures have concluded that, when stock prices are high and rising, M&A is higher, more M&A is financed with stock, market sentiment and stockholders’ perceptions of information appear to change, and in these circumstances new (arbitrage) motivations for M&A emerge. This paper revisits earnings management ahead of M&A in the light of these findings, comparing experience in ‘hot’ and ‘cold’ markets. It finds that such earnings management is more pronounced in hot markets; that only in such markets are positive discretionary accruals commonly associated with positive abnormal returns on the announcement of earnings; and that in such markets – against the expectations from signalling theory – these positive returns are not reversed on announcement of a stockfor- stock bid. The results suggest that the economic benefits achieved by engaging in earnings management during hot markets are indeed significant: in hot markets, we estimate that on average share acquirers engage in working capital accrual management equivalent to over a third of the average acquirer’s return on total assets in that year; and that this earnings management is associated with increases in market value which are statistically and economically significant, enabling the bidder to secure control of the target with fewer shares.