The shares were bought at an average A$4.34 each through a cash-settled equity swap with UBS that gives Tabcorp voting rights subject to certain conditions, the company said.
A source familiar with the situation told Reuters that the share purchase was meant to make it harder for an interloper to break up an agreed merger between the pair.
““Tabcorp, Australia's biggest bookmaker, last month agreed to acquire lottery operator Tatts for A$6.4 billion to create a gambling powerhouse in an effort to fend off a growing challenge from overseas online rivals
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Tabcorp, the smaller of the two companies by market value, will offer 0.8 Tabcorp share plus A$0.425 in cash for each Tatts share. That implies a value of A$4.09 based on the last closing price of Tabcorp.