Prothena Announces Proposed Public Offering of Ordinary Shares

On December 13, 2022 Prothena Corporation plc (NASDAQ:PRTA), a late-stage clinical biotechnology company with a robust pipeline of investigational therapeutics built on protein dysregulation expertise, reported that it has commenced an underwritten public offering of 3,000,000 of its ordinary shares (Press release, Prothena, DEC 13, 2022, View Source [SID1234625237]). All of the ordinary shares in the offering will be sold by Prothena. In addition, Prothena expects to grant the underwriters a 30-day option to purchase up to an additional 15% of the number of ordinary shares sold.

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Jefferies, Evercore ISI and Cantor are acting as joint book-running managers for the offering. The offering is subject to market conditions, and there can be no assurance as to whether or when the offering will be completed, or as to the actual size or terms of the offering.

The proposed public offering will be made pursuant to an automatic shelf registration statement on Form S-3 that was filed with the Securities and Exchange Commission (the "SEC") on March 23, 2021 and automatically became effective upon filing. A preliminary prospectus supplement and accompanying prospectus relating to and describing the terms of the offering will be filed with the SEC and available on the SEC’s website located at View Source or may be obtained by contacting Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, New York, NY 10022, or by telephone at (877) 821-7388, or by e-mail at [email protected]; Evercore Group L.L.C., Attention: Equity Capital Markets, 55 East 52nd Street, 35th Floor, New York, NY 10055, or by telephone at (888) 474-0200, or by email at [email protected]; or Cantor Fitzgerald & Co., Attention: Capital Markets, 499 Park Avenue, 4th Floor, New York, NY 10022, or by e-mail at [email protected].