Eastern Bank has completed its third acquisition in five years as it remains in the crosshairs of an activist investor that says it has acquired too many banks too quickly.

Eastern’s holding company, Eastern Bankshares Inc. (Nasdaq: EBC), confirmed Monday that on Nov. 1 it closed on its $490 million deal to merge with Brockton-based HarborOne Bancorp Inc., the parent of HarborOne Bank.

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