Berkshire Hills Bancorp Inc. in Pittsfield, Mass., is selling up to $30 million of common stock.

The $2.5 billion-asset company announced after the market closed Monday that it had begun the public offering and that it would use the proceeds to pursue growth opportunities.

The news sent its stock price tumbling Tuesday, to $26.20, down 9%. The offering draws down on a $125 million shelf registration filed with the Securities and Exchange Commission in 2006.

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