Thermo Fisher Scientific Inc. (NYSE: TMO) will buy FEI Co. (Nasdaq: FEIC) for about $4.2 billion, gaining imaging technology for the life sciences and materials science industries.

The boards of the two companies unanimously approved the deal, in which Thermo Fisher will pay $107.50 a share in cash, the companies said in a statement Friday. That represents a 14 percent premium to FEI’s closing share price of $94.58 on Thursday.

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