Prothena Announces Proposed Offering of Ordinary Shares

On March 24, 2021 Prothena Corporation plc (NASDAQ:PRTA), a late-stage clinical company with expertise in protein dysregulation and a pipeline of investigational therapeutics for rare peripheral amyloid and neurodegenerative diseases, reported that it has commenced an underwritten public offering of its ordinary shares (Press release, Prothena, MAR 24, 2021, View Source [SID1234577092]). All of the ordinary shares in the offering will be sold by Prothena. In addition, Prothena has granted the underwriters a 30-day option to purchase up to an additional 15% of the number of ordinary shares sold.

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Citigroup, Jefferies, and Cantor are acting as joint book-running managers. 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 Citigroup Global Markets Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, or by telephone at (800) 831-9146; Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, 2nd Floor, New York, NY 10022, or by telephone at (877) 821-7388, or by e-mail at [email protected]; or Cantor Fitzgerald & Co., Attention: Capital Markets, 499 Park Avenue, 6th Floor New York, NY 10022, or by emailing [email protected].

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