Eplontersen:

NEURO-TTRansform Results

April 25, 2023

Nasdaq: IONS

Every Moment Matters...

in the Discovery, Development & Delivery of Life Transforming Genetic Medicines

Forward-Looking Statements

This presentation includes forward-looking statements regarding our business, financial guidance and the therapeutic and commercial potential of SPINRAZA® (nusinersen), TEGSEDI® (inotersen), WAYLIVRA® (volanesorsen), eplontersen, olezarsen, donidalorsen, ION363, pelacarsen, bepirovirsen, 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 Form 10-K for the year ended December 31, 2022, which is on file with the SEC. Copies of this 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.

2

Agenda

Topic

Speaker

Welcome

Wade Walke, Ph.D.

Introduction

Brett Monia, Ph.D.

ATTR & Eplontersen Program Overview

Eugene Schneider, M.D.

NEURO-TTRansformWeek-35 and Week-66 Data

Sami Khella, M.D.

ATTR Cardiomyopathy & CARDIO-TTRansform

Sam Tsimikas, M.D.

Commercial Readiness

Onaiza Cadoret

Concluding Remarks

Brett Monia, Ph.D.

Q&A

3

Introduction

Brett Monia, Ph.D.

Chief Executive Officer

Every Moment Matters...

in the Discovery, Development & Delivery of Life Transforming Genetic Medicines

Eplontersen: Well Positioned to Address Underserved, Global ATTRv-PN Market1,2

Met co-primary and all secondary endpoints

Favorable safety and tolerability

Next steps: regulatory & commercial

  • Met all co-primary and secondary endpoints at week-35 and 66
  • Substantial number of patients improved in measures of neuropathy progression and quality of life compared to baseline
  • Favorable safety and tolerability profile comparable to placebo
  • Safety and tolerability consistent with LICA platform
  • Preparing to launch in the U.S.; PDUFA December 22, 2023
  • Preparing for additional oUS regulatory submissions this year

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1. Timing expectations based on current assumptions and subject to change. 2. Assuming approval.

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Disclaimer

Ionis Pharmaceuticals Inc. published this content on 25 April 2023 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 25 April 2023 17:14:36 UTC.