Haven Bancorp has adopted a shareholder rights plan that would be triggered when an individual, group, or company acquires at least 10% of the New York City thrift company's stock.

Under the plan, which would be activated 20 business days after a buyer passes the 10% threshold, the rights would entitle shareholders to buy shares of Haven common stock for half the market value. That would dilute the value of the large buyer's holdings in an effort to force negotiations with the board.

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