Lexicon Announces Completion of Common Stock Offering

THE WOODLANDS, Texas, March 19 /PRNewswire-FirstCall/ -- Lexicon Pharmaceuticals, Inc. today announced the completion of its previously-announced public offering and concurrent private placement of its common stock, resulting in net proceeds to Lexicon of approximately $181.4 million after the exercise in full by the underwriters of their over-allotment option and by Invus, L.P., Lexicon's largest stockholder, of its associated right to purchase additional shares. The public offering and concurrent private placement included an aggregate of 161,770,206 shares of Lexicon's common stock. Of this total, 96,521,739 shares were offered through the underwriters and 65,248,467 shares were purchased by Invus and one of its affiliates in the concurrent private placement.

The shares subject to the public offering were offered pursuant to an effective shelf registration statement previously filed with the Securities and Exchange Commission. Morgan Stanley & Co. Incorporated and J.P. Morgan Securities Inc. acted as joint book-runners for the public offering, with Cowen and Company, LLC and Thomas Weisel Partners LLC acting as co-managers.

This press release does not constitute an offer to sell, or the solicitation of an offer to buy, these securities, nor will there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale is not permitted. The offering of the securities in the public offering was made only by means of a final prospectus supplement and accompanying prospectus, copies of which may be obtained from Morgan Stanley & Co. Incorporated, Attn: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014, telephone: [phone], or by emailing [e-mail], or from J.P. Morgan Securities Inc., Attention: Broadridge Financial Solutions at 1155 Long Island Avenue, Edgewood, New York 11717, or by telephone at [phone].

The issuer has filed a registration statement (including a base prospectus) with the Securities and Exchange Commission, or SEC, for an offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and related prospectus supplements and other documents that the issuer has filed or will file with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting EDGAR on the SEC website at http://www.sec.gov/. Alternatively, you may obtain a final prospectus supplement and accompanying prospectus as indicated above.

The shares sold to Invus and its affiliate in the private placement have not been, and will not be, registered under the Securities Act of 1933, as amended, or any state securities laws and may not be offered or sold in the United States absent registration or applicable exemption from the registration requirement of such Act and applicable state securities laws.

About Lexicon

Lexicon is a biopharmaceutical company focused on discovering breakthrough treatments for human disease. Lexicon currently has four drug candidates in mid-stage development for diabetes, irritable bowel syndrome, carcinoid syndrome and rheumatoid arthritis, all of which were discovered by the company's research team.

Safe Harbor Statement

This press release contains "forward-looking" statements. Any statements contained in this press release that are not statements of historical fact may be deemed to be forward-looking statements. Words such as "anticipated," "will," "proposed," and similar expressions are intended to identify these forward-looking statements. There are a number of important factors that could cause Lexicon's results to differ materially from those indicated by these forward-looking statements. Additional risks and uncertainties relating to Lexicon and its business can be found under the headings "Factors Affecting Forward-Looking Statements" and "Risk Factors" in Lexicon's annual report on Form 10-K for the year ended December 31, 2009, as filed with the Securities and Exchange Commission and under the heading "Risk Factors" in the final prospectus supplement related to the public offering filed with the Securities and Exchange Commission. Unless required by applicable law, Lexicon undertakes no obligation to update or revise any such forward-looking statements, whether as a result of new information, future events or otherwise.

Lexicon Pharmaceuticals, Inc.

CONTACT: D. Wade Walke, Senior Director, Corporate Communications of
Lexicon Pharmaceuticals, Inc., [phone], [e-mail]

Web Site: http://www.lexpharma.com/