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Simpson Thacher represented the underwriters in connection with the initial public offering of common stock of Polypore International, Inc., which closed on July 3, 2007. J.P. Morgan Securities Inc. acted as the sole book running manager for the offering. Credit Suisse Securities (USA) LLC, Bear, Stearns & Co. Inc., Robert W. Baird & Co. Incorporated and William Blair & Company, L.L.C. acted as co-managers for the offering. Polypore’s shares are now listed on the New York Stock Exchange under the symbol “PPO”.

Polypore is a global high technology filtration company specializing in microporous membranes. Polypore’s membrane technologies are used in a wide array of markets and products, from lithium batteries, used in mobile phones and laptop computers, to healthcare applications.

The Simpson Thacher team for this transaction included Gary Sellers, Edgar Lewandowski and Margaret Nicholls (Capital Markets); Jonathan Cantor and Peter Rosen (Tax); Adeeb Fadil and Noreen Lavan (Environmental); Susan Kaufman (Executive Compensation & Employee Benefits); Julie Levy (Labor); Mark Lab and Sean Cotton (NASD).