Olezarsen: A Potential New Medicine for Patients with FCS

September 26, 2023

Nasdaq: IONS

Forward-Looking Statements

This presentation includes forward-looking statements regarding the therapeutic and commercial potential of olezarsen, Ionis' technologies, and Ionis' other products in development. Any statement describing Ionis' goals, expectations, financial or other projections, intentions or beliefs is a forward-looking statement and should be considered an at-risk statement. Such statements are subject to certain risks and uncertainties including but not limited to those related to our commercial products and the medicines in our pipeline, and particularly those inherent in the process of discovering, developing and commercializing medicines that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such medicines. Ionis' forward-looking statements also involve assumptions that, if they never materialize or prove correct, could cause its results to differ materially from those expressed or implied by such forward-looking statements. Although Ionis' forward-looking statements reflect the good faith judgment of its management, these statements are based only on facts and factors currently known by Ionis. As a result, you are cautioned not to rely on these forward-looking statements. These and other risks concerning Ionis' programs are described in additional detail in Ionis' annual report on our Form 10-K for the year ended December 31, 2022, and our most recent Form 10-Q quarterly filing, which are on file with the SEC. Copies of these and other documents are available at www.ionispharma.com.

In this presentation, unless the context requires otherwise, "Ionis," "Company," "we," "our," and "us" refers to Ionis Pharmaceuticals and its subsidiaries.

Ionis Pharmaceuticals® is a registered trademark of Ionis Pharmaceuticals, Inc. Akcea Therapeutics® is a registered trademark of Akcea Therapeutics, Inc. TEGSEDI® is a trademark of Akcea Therapeutics, Inc. WAYLIVRA® is a registered trademark of Akcea Therapeutics, Inc. QALSODYTM is a trademark of Biogen. SPINRAZA® is a registered trademark of Biogen.

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Agenda

Topic

Speaker

Welcome

Wade Walke, Ph.D.

Introduction

Brett Monia, Ph.D.

FCS: Biology and Significant Unmet Need

Sam Tsimikas, M.D.

Phase 3 Balance Study: Topline Results

Sam Tsimikas, M.D.

FCS Go-to-Market Plan

Onaiza Cadoret

Concluding Remarks

Brett Monia, Ph.D.

Q&A

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Introduction

Brett Monia, Ph.D.

Chief Executive Officer

4

Positive Results from Olezarsen Balance Study Further Advances Two of Our Key Priorities

Establish an integrated commercial organization

Deliver a steady cadence of new medicines to the market

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Ionis Pharmaceuticals Inc. published this content on 26 September 2023 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 26 September 2023 15:06:08 UTC.