Catalyst Biosciences Announces Proposed Public Offering of Common Stock

SOUTH SAN FRANCISCO, Calif., June 17, 2020 (GLOBE NEWSWIRE) -- Catalyst Biosciences, Inc. CBIO today announced that it is offering shares of its common stock in an underwritten public offering. The offering is subject to market and other conditions, and there can be no assurance as to whether or when the offering may be completed, or as to the actual size or terms of the offering. In addition, Catalyst expects to grant the underwriters of the offering a 30-day option to purchase up to an additional 15% of the number of shares of common stock offered in the public offering. All of the shares in the offering are being offered by Catalyst.

Catalyst anticipates using the net proceeds from this offering for general corporate purposes, which may include research and development activities in its complement program, clinical and manufacturing activities for marzeptacog alfa and dalcinonacog alfa, other research and development activities, capital expenditures, selling, general and administrative costs, facilities expansion, and to meet working capital needs.

Raymond James & Associates, Inc. is acting as the sole book-running manager and National Securities Corporation, a wholly-owned subsidiary of National Holdings, Inc. (Nasdaq NHLD), is acting as the lead manager for the proposed offering.

A "shelf" registration statement on Form S-3 (File No. 333-228970) relating to the public offering of the shares of common stock described above was previously filed with and declared effective by the Securities and Exchange Commission (SEC) on February 14, 2019. A preliminary prospectus supplement and accompanying prospectus relating to the offering will be filed with the SEC and will be available on the SEC's web site at www.sec.gov. When available, copies of the preliminary prospectus supplement and accompanying prospectus may also be obtained from Raymond James & Associates, Inc., Attention: Equity Syndicate, 880 Carillon Parkway, St. Petersburg, Florida 33716, by telephone at (800) 248-8863, by e-mail at prospectus@raymondjames.com.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy any of the securities described herein. There shall not be any offer, solicitation of an offer to buy, or sale of securities in any state or jurisdiction in which such an offering, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Catalyst Biosciences
Catalyst is a research and clinical development biopharmaceutical company focused on addressing unmet needs in rare hematologic and systemic complement-mediated disorders. Our protease engineering platform includes development programs in hemophilia, a research program on subcutaneous (SQ) systemic complement inhibitors and a partnered preclinical development program with Biogen for dry age-related macular degeneration (AMD). One of our key competitive advantages is that the product candidates generated by our protease engineering platform have improved functionality and potency. These characteristics allow for improved dosing of our candidates including SQ systemic administration of recombinant coagulation factors and complement inhibitors, low-dose, high activity gene therapy constructs, and less frequently dosed intravitreal therapeutics. Our most advanced asset, SQ MarzAA has successfully completed Phase 2 development in prophylaxis, significantly reducing the annualized bleed rate (ABR) in individuals with Hemophilia A or B with inhibitors. Following regulatory guidance from the U.S. Food and Drug Administration and European Medicines Agency, we recently announced the design of a Phase 3 registration study that is planned for late 2020. Subcutaneous dalcinonacog alfa (DalcA) is being developed for the treatment of Hemophilia B and has demonstrated efficacy and safety in a Phase 2b clinical trial. We have a discovery stage Factor IX gene therapy construct - CB 2679d-GT - for Hemophilia B, that has demonstrated superiority compared with the Padua variant in preclinical models. Finally, we have a global license and collaboration agreement with Biogen for the development and commercialization of anti-complement Factor 3 (C3) pegylated CB 2782 for the potential treatment of geographic atrophy-associated dry AMD.

Forward-Looking Statements
This press release contains forward-looking statements that involve substantial risks and uncertainties. All statements pertaining to Catalyst's expectations regarding the intention to conduct an offering, and sale of securities, ability to complete the offering and expected use of proceeds  described in this press release constitute forward-looking statements. All statements, other than statement of historical facts (including, but not limited to, statements that contain words such as "will," "believes," "plans," "anticipates," "expects," "estimates") are forward-looking statements. Actual results or events could differ materially from the plans, intentions, expectations and projections disclosed in the forward-looking statements. Various important factors could cause actual results or events to differ materially from the forward-looking statements that Catalyst makes, including, but not limited to, uncertainties associated with market conditions and the completion of the public offering on the anticipated terms or at all and other risks described in the "Risk Factors" sections of Catalyst's most recent annual report filed with the SEC on February 20, 2020, quarterly report filed with the SEC on May 11, 2020, the prospectus supplement related to the public offering and in other filings with the SEC. Catalyst does not assume any obligation to update any forward-looking statements, except as required by law.

Contact:
Ana Kapor
Catalyst Biosciences, Inc.
investors@catbio.com