Polypore International has priced a previously announced public offering of 4.5 million shares of common stock. Sellers include two Warburg Pincus private-equity funds and some Polypore executives and directors. The stock is being sold at $52.75 per share. The deal, valued at $237.4 million, is scheduled to close March 23, 2011. The polymer-based microporous membranes maker appointed Barclays Capital as the book-running manager for the offering.

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