March 24, 2010, PETALUMA, CA—Calix, Inc. announced today the pricing of the initial public offering of shares of its common stock at a public offering price of $13.00 per share. Calix is offering 4,166,666 shares of common stock and certain selling stockholders are offering 2,162,266 shares of common stock. Calix has granted the underwriters an option to purchase up to an additional 949,339 shares of common stock. Calix common stock is expected to begin trading on the New York Stock Exchange under the symbol "CALX" on March 24, 2010. Goldman, Sachs & Co. and Morgan Stanley & Co. Incorporated are acting as lead joint book runners for the offering, and Jefferies & Company, Inc. and UBS Securities LLC are acting as joint book runners for the offering.

A registration statement relating to this offering was declared effective by the Securities and Exchange Commission (SEC) on March 23, 2010. This offering is being made solely by means of a written prospectus forming part of the effective registration statement. A copy of the final prospectus relating to the offering may be obtained, when available, from any of the following investment banks:

• Goldman, Sachs & Co., Attention: Prospectus Department, 200 West Street, New York, NY 10282-2198, phone (866) 471-2526 or by email: prospectus-ny@ny.email.gs.com;
• Morgan Stanley & Co. Incorporated, Attention: Prospectus Department, 180 Varick Street, 2^nd Floor, New York, NY 10014, phone (866) 718-1649 or by email: prospectus@morganstanley.com;
• Jefferies & Company, Inc., Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, 12th Floor, New York, NY 10022, phone (877) 547-6340 or by email: prospectus_department@jefferies.com; or
• UBS Securities LLC, Attention: Prospectus Department, 299 Park Avenue, New York, NY 10171, phone (888) 827-7275.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sales of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such jurisdiction.

About Calix

Calix is a leading provider in North America of broadband communications access systems and software for copper- and fiber- based network architectures that enable communications service providers to connect to their residential and business subscribers. Calix has shipped over six million ports of its Unified Access Infrastructure portfolio to more than 500 North American and international customers, whose networks serve over 32 million subscriber lines in total.