CATALYST BIOSCIENCES

Corporate Overview

15 November 2021

© Catalyst Biosciences

Forward looking statements

Certain information contained in this presentation and statements made orally during this presentation include forward-looking statements that involve substantial risks and uncertainties. All statements included in this presentation, other than statements of historical facts, are forward-looking statements. This press release contains forward-lookingstatements that involve substantial risks and uncertainties. Forward-lookingstatements include, without limitation, our plans to submit an IND for CB 4332 and begin clinical trials, announce a development candidate from our ProTUNE platform, continue to support Biogen in the development of CB 2782-PEG, and reduce the Company's burn rate by stopping development of MarzAA, as well as statements about the product candidates of Catalyst Biosciences, Inc. (the "Company") and the benefits of its protease engineering platform.

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, including, but not limited to, the risk that clinical trials and preclinical studies may be delayed as a result of COVID-19, competitive products, and other factors, that the FDA may not agree to our clinical trial plan for CB 4332, that Biogen could terminate our agreement for the development of CB 2782-PEG, that the Company's complement degraders are not yet in human clinical trials and will require additional manufacturing validation and preclinical testing before entering human clinical trials, that the Company may need to raise additional capital, and other risks described in the "Risk Factors" section of the Company's Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on March 4, 2021, the Quarterly Report on Form 10-Q filed with the SEC on November 12, 2021, and in other filings filed from time to time with the SEC. The Company does not assume any obligation to update any forward-looking statements, except as required by law.

© Catalyst Biosciences

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The Protease Medicines Company

Harnessing the catalytic power of proteases

Novel differentiated medicines

Robust complement portfolio

Unique expertise in protease engineering

© Catalyst Biosciences

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Corporate strategy change announced 12 November

Path for long-term success

Stop MarzAA development

Focus on our protease medicines & complement

therapeutics platform

  • MarzAA enrollment challenging
  • No longer feasible to deliver topline data in 2022
  • Plan to report data from MAA-304 obtained to date
  • Exploring opportunities to license or sell MarzAA & DalcA
  • Reduces burn rate significantly
  • Programs poised to achieve several value-creating milestones in 2022 and beyond
  • Move forward with CB 4332 clinical development
  • Complete transfer of CBIO supported activities to Biogen for CB 2782-PEG, our C3 degrader for the potential treatment of dry AMD
  • Generate candidates from our protease platform for licensing or internal development

© Catalyst Biosciences

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Catalyst protease platform

Focus on complement therapeutics

CB 2782-PEG

CB 4332 Enhanced CFI

Best-in-class profile for dry AMD

Restoring balance to complement

Extended pharmacodynamics

in patients with dysregulated CFI

Novel C3-degrader

Engineered CFI entering

partnered to Bio for dry AMD

the clinic in 2022

© Catalyst Biosciences

Engineered proteases

Protease platforms tailored to restore function in specific indications​

C4b C3b

ProTUNE™

PLATFORM

C3b/C4b degrader platform delivering candidates 2022

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Catalyst Biosciences Inc. published this content on 15 November 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 15 November 2021 18:14:06 UTC.