Briefly

Sealy Corp., the world’s largest mattress maker, raised $448 million in an initial public offering that will enable its owner, Kohlberg Kravis Roberts & Co., to more than double its investment in two years.

The maker of the Sealy Posturepedic mattress sold 28 million shares at $16 each, a person involved in the transaction said Thursday. The IPO price range was $14 to $16 a share.

The company’s stock will trade on the New York Stock Exchange under the symbol ZZ.