Spain's top lender Santander moved to gain full control of Polish bid target Bank Zachodni WBK (BZWB.WA) on Monday, offering to buy minority investors out for a 4.5 percent premium which values the bank at $5.7 billion. Santander beat European rivals seeking a slice of Polish growth with a deal in September to buy 70.4 percent of the country's fifth largest bank by assets from Allied Irish Banks (ALBK.I), part of a 2.9 billion euro transaction. It is still awaiting Polish regulatory approval.
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