ION-582

WAINUATM U.S. launch progressing well; approved in UK; positive CHMP opinion Olezarsen FCS PDUFA December 19, 2024 Donidalorsen HAE PDUFA August 21, 2025; EU regulatory submission in process On track to achieve 2024 P&L financial guidance; increased 2024 cash guidance CARLSBAD, Calif., Nov. 6, 2024 /PRNewswire/ -- Ionis Pharmaceuticals, Inc. (Nasdaq: IONS) (the "Company") today reported financial results for the third quarter of 2024. "Today, we stand on the cusp of a new era for Ionis, with our first co-commercialization launch proceeding well with WAINUA, our first planned independent launch fast approaching and continued strong progress across our rich pipeline. With an upcoming December FDA action date, we are ready to independently bring olezarsen to people with familial chylomicronemia syndrome, a serious rare disease with no approved treatments in the U.S. We are similarly well positioned for our second independent launch for donidalorsen, which we believe could become a preferred treatment choice for people with hereditary angioedema, with an FDA action date of August 21, 2025," said Brett P. Monia, Ph.D., chief executive officer of Ionis. "In parallel, we are making great progress across the rest of our rich Phase 3 pipeline. We expect Phase 3 results supporting olezarsen's second indication in severe hypertriglyceridemia and pelacarsen in Lp(a)-driven cardiovascular disease next year, as well as Phase 3 results supporting eplontersen's second indication in ATTR cardiomyopathy in the second half of 2026. We are also advancing our next wave of potentially transformational wholly owned medicines, including ION582 for Angelman syndrome, which we expect to enter Phase 3 development in the first half of next year following our positive end of Phase 2 discussion with the FDA. Our recent achievements, together with our advancing and expanding pipeline, position Ionis to deliver on our goal to bring a steady cadence of transformational medicines to people with serious diseases." Third Quarter 2024 Summary Financial Results(1): Financial Highlights Revenue for the three and nine months ended September 30, 2024 decreased by 7% and increased by 3% compared to the same periods last year, respectively. Ionis continued to generate revenue from diverse sources, including a new source of royalty revenue with the launch of WAINUA in the U.S in the first quarter Operating expenses for the three and nine months ended September 30, 2024 increased as planned compared to the same periods last year, excluding certain one-time costs in 2023, reflecting continued investments in late-stage development, including WAINUA for ATTR cardiomyopathy (ATTR-CM) and olezarsen for severe hypertriglyceridemia (sHTG), and commercialization efforts for WAINUA, olezarsen and donidalorsen Reaffirmed 2024 P&L financial guidance, increased cash guidance to $2.2 billion reflecting proceeds from equity offering Recent Marketed Medicines Highlights WAINUA (WAINZUA in Europe) for the treatment of adults with polyneuropathy of hereditary transthyretin-mediated amyloidosis (ATTRv-PN) achieved multiple commercial and regulatory milestones: Generated sales of $23 million and $44 million resulting in royalty revenue of $5 million and $10 million in the three and nine months ended September 30, 2024, respectively Received positive Committee for Medicinal Products for Human Use (CHMP) opinion from European Medicines Agency (EMA) for the treatment of hereditary transthyretin-mediated amyloidosis in adult patients with stage 1 or stage 2 polyneuropathy Approved in UK by the Medicines and Healthcare products Regulatory Agency (MHRA) with an accelerated National Institute for Health and Care Excellence (NICE) recommendation; earning $30 million from AstraZeneca Launch underway in Canada, following approval and reimbursement from Health Canada SPINRAZA® (nusinersen) for the treatment of spinal muscular atrophy (SMA) generated global sales of $381 million and $1.2 billion resulting in royalty revenue of $57 million and $152 million in the three and nine months ended September 30, 2024, respectively Positive Phase 2/3 DEVOTE study data presented from higher dose nusinersen; global regulatory applications planned QALSODY® (tofersen) granted marketing approval in China for the treatment of SOD1-ALS Recent Late-Stage Pipeline Highlights Olezarsen positioned to potentially treat two patient populations with urgent unmet need, familial chylomicronemia syndrome (FCS) and severe hypertriglyceridemia (sHTG): NDA for patients with FCS under FDA Priority Review with a PDUFA date of December 19, 2024 Marketing authorization application (MAA) under regulatory review by the EMA Ongoing pivotal development program for sHTG on track for data in H2:2025 Donidalorsen Phase 3 data position it to potentially launch next year as the first RNA-targeted prophylactic treatment for people with hereditary angioedema (HAE): FDA accepted the NDA for patients with HAE with a PDUFA date of August 21, 2025; Otsuka, Europe and Asia Pacific partner, preparing to submit MAA Presented positive Phase 2 open label extension (OLE) study data in patients treated up to three years with every four weeks or every eight weeks dosing Zilganersen Phase 3 study fully enrolled as a potential treatment for Alexander disease; on track for data in 2025 Granted Fast Track designation by the FDA ION582 achieved important clinical and regulatory milestones enabling initiation of Phase 3 development in Angelman syndrome (AS) in H1:2025: Presented positive Phase 1/2 data in patients with AS at Angelman Syndrome Foundation (ASF) Family Conference Completed positive End-of-Phase 2 discussion with FDA, included alignment on Phase 3 design Reported positive data from the Phase 2 study of IONIS-FB-LRx in patients with immunoglobulin A nephropathy (IgAN); Roche continues to advance IONIS-FB-LRx in the Phase 3 IMAGINATION study Recent Other Pipeline Updates Sapablursen for the treatment of polycythemia vera granted orphan drug designation by FDA; enrollment complete in Phase 2 IMPRSSION study with data expected in 2025 IONIS-MAPTRx (BIIB080) enrollment complete in Phase 2 CELIA study in patients with early Alzheimer's disease (AD); data expected in 2026 Initiated first in human studies with multiple medicines from neurological disease pipeline: Phase 1/2 Orbit study of ION356 (PLP1) in patients with Pelizaeus-Merzbacher disease (PMD) Phase 1/2 HERO study of ION269 (APP), for the potential treatment of Alzheimer's disease (AD), which is initially being evaluated in patients with Down syndrome (DS) who have a genetic risk for developing AD Phase 1/2 ATTUNE study of ION440 (MECP2) in patients with MECP2 duplication syndrome Third Quarter 2024 Financial Results "This year has been marked by strong delivery on our pipeline and business goals, which position Ionis to deliver on our vision of bringing a steady cadence of innovative medicines to patients in need. Fully realizing these significant opportunities requires substantial investment. As a result, we recently executed an equity offering that extends our cash runway, enabling us to continue to invest in the numerous attractive opportunities ahead of us, including our near-term commercial launches with multi-billion-dollar revenue potential and our rich late and mid-stage pipeline," said Elizabeth L. Hougen, chief financial officer of Ionis. "Looking beyond this year, we will continue to invest in go-to-market preparations for our planned olezarsen and donidalorsen launches. Additionally, with our increased confidence in the potential of WAINUA and olezarsen to address broader patient populations, we plan to scale our capabilities in line with the significant potential of these important medicines. At the same time, we are investing in our next wave of medicines, including pre-commercialization activities and Phase 3 development for ION582 for Angelman syndrome and zilganersen for Alexander disease. We expect our investments today will position Ionis for sustainable growth for years to come." Revenue Ionis' revenue was comprised of the following: Commercial revenue for the three and nine months ended September 30, 2024 included a new source of royalty revenue with the launch of WAINUA in the U.S. in late January 2024. Ionis' commercial revenue for the three and nine months ended September 30, 2024 and 2023 also included royalties from the net sales of QALSODY, which Biogen launched in the U.S. in the second quarter of 2023 and in the EU in the second quarter of 2024. SPINRAZA product sales for the three months ended September 30, 2024 compared to the same period last year increased slightly in the U.S. and decreased outside of the U.S. primarily due to an annual order from a single country that did not recur in 2024. R&D revenue was relatively consistent for the three months ended September 30, 2024 compared to the same period last year. R&D revenue increased for the nine months ended September 30, 2024 compared to the same period last year primarily due to the amortization of upfront payments from the new collaborations with Roche and Novartis that Ionis entered into during the second half of last year. In addition, license fees increased year over year as a result of new collaborations Ionis entered into during the second quarter of 2024, including the expanded donidalorsen licensing agreement with Otsuka, which now includes the Asia-Pacific region in addition to Europe. These increases were partially offset by the decrease in WAINUA joint development revenue, which decreased as development activities relating to ATTRv-PN wound down with the launch of WAINUA for this indication. Operating Expenses Ionis' operating expenses, excluding one-time costs associated with a lease exit in the third quarter of 2023, increased for the three and nine months ended September 30, 2024 compared to the same periods in 2023, consistent with expectations. SG&A expenses increased year over year primarily due to the launch of WAINUA in the U.S. and launch preparation activities for olezarsen and donidalorsen, including establishing the field team for olezarsen in the second quarter of 2024. R&D expenses were essentially flat for the three and nine months ended September 30, 2024 compared to the same periods last year as several late-stage studies have ended. Balance Sheet As of September 30, 2024, Ionis' cash, cash equivalents and short-term investments increased to $2.5 billion compared to $2.3 billion at December 31, 2023. In September 2024, Ionis issued 11.5 million shares of its common stock at a public offering price of $43.50 per share that generated gross proceeds of $500 million, before deducting underwriting discounts and commissions and other offering expenses payable by Ionis. The Company plans to continue deploying its capital resources toward growth opportunities, and projects to end 2024 with $2.2 billion in cash, cash equivalents and short-term investments. Ionis' working capital also increased over the same period primarily due to the Company's higher cash and short-term investments balance. As a result of Ionis' advancing pipeline that has delivered several positive data readouts, Ionis expects to make increased investments in the years ahead with the goal to realize the value of these opportunities, with a focus on its wholly owned late-stage and next wave of innovative medicines. Webcast Management will host a conference call and webcast to discuss Ionis' third quarter 2024 results at 11:30 a.m. Eastern time on Wednesday, November 6, 2024. Interested parties may access the webcast here. A webcast replay will be available for a limited time at the same address. To access the Company's third quarter 2024 earnings slides click here. For more information about SPINRAZA and QALSODY, visit and , respectively. QALSODY is approved under accelerated approval based on reduction in plasma neurofilament light chain (NfL) observed in patients treated with QALSODY. Continued approval may be contingent upon verification of clinical benefit in confirmatory trial(s). INDICATION for WAINUA™ (eplontersen) WAINUA injection, for subcutaneous use, 45 mg is indicated for the treatment of the polyneuropathy of hereditary transthyretin-mediated amyloidosis in adults. IMPORTANT SAFETY INFORMATION for WAINUA™ (eplontersen) WARNINGS AND PRECAUTIONS Reduced Serum Vitamin A Levels and Recommended Supplementation WAINUA leads to a decrease in serum vitamin A levels. Supplement with recommended daily allowance of vitamin A. Refer patient to an ophthalmologist if ocular symptoms suggestive of vitamin A deficiency occur. ADVERSE REACTIONS Most common adverse reactions (≥9% in WAINUA-treated patients) were vitamin A decreased (15%) and vomiting (9%). Please see link to U.S. Full Prescribing Information for WAINUA. About Ionis Pharmaceuticals, Inc. For three decades, Ionis has invented medicines that bring better futures to people with serious diseases. Ionis currently has five marketed medicines and a leading pipeline in neurology, cardiology, and other areas of high patient need. As the pioneer in RNA-targeted medicines, Ionis continues to drive innovation in RNA therapies in addition to advancing new approaches in gene editing. A deep understanding of disease biology and industry-leading technology propels our work, coupled with a passion and urgency to deliver life-changing advances for patients. To learn more about Ionis, visit Ionis.com and follow us on X (Twitter), LinkedIn and Instagram. Ionis' Forward-looking Statement This press release includes forward-looking statements regarding Ionis' business, financial guidance and the therapeutic and commercial potential of our commercial medicines, additional medicines in development and technologies. 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 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. Except as required by law, we undertake no obligation to update any forward-looking statements for any reason. 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, 2023, and most recent Form 10-Q, which are on file with the Securities and Exchange Commission. Copies of these and other documents are available from the Company. In this press release, unless the context requires otherwise, "Ionis," "Company," "we," "our" and "us" all refer 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 registered trademark of Akcea Therapeutics, Inc. WAYLIVRA® is a registered trademark of Akcea Therapeutics, Inc. SPINRAZA® and QALSODY® are registered trademarks of Biogen. WAINUATM is a registered trademark of the AstraZeneca group of companies. Ionis Investor Contact: D. Wade Walke, Ph.DD. [email protected] 760-603-2331 Ionis Media Contact: Hayley Soffer [email protected] 760-603-4679 Reconciliation of GAAP to Non-GAAP Basis As illustrated in the Selected Financial Information in this press release, non-GAAP operating expenses, non-GAAP loss from operations, and non-GAAP net loss were adjusted from GAAP to exclude compensation expense related to equity awards and the related tax effects. Compensation expense related to equity awards are non-cash. These measures are provided as supplementary information and are not a substitute for financial measures calculated in accordance with GAAP. Ionis reports these non-GAAP results to better enable financial statement users to assess and compare its historical performance and project its future operating results and cash flows. Further, the presentation of Ionis' non-GAAP results is consistent with how Ionis' management internally evaluates the performance of its operations. Key 2024 Value Driving Events(1) SOURCE Ionis Pharmaceuticals, Inc. WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED

WAINUATM U.S. launch progressing well; approved in Canada; EU approval decision expected this year Olezarsen PDUFA December 19, 2024 for FCS Positive Phase 3 donidalorsen data for HAE; preparing U.S. and EU regulatory submissions On track to achieve 2024 financial guidance CARLSBAD, Calif., Aug. 1, 2024 /PRNewswire/ -- Ionis Pharmaceuticals, Inc. (Nasdaq: IONS) (the "Company"), today reported financial results for the second quarter of 2024. "Over the first half of this year, we continued to deliver on our goal to bring a steady cadence of medicines to people with serious diseases. The WAINUA launch for hereditary ATTR polyneuropathy (ATTRv-PN) continues to progress well with AstraZeneca. QALSODY is now approved in the EU, expanding the number of patients who can benefit from the first approved treatment for a genetic form of ALS. And we are well positioned for our first independent launch with olezarsen, which was accepted for Priority Review with a December FDA action date for people with familial chylomicronemia syndrome (FCS), a serious and rare disease with no approved treatments in the U.S. Additionally, we completed enrollment in our Phase 3 olezarsen program for the much larger severe hypertriglyceridemia (sHTG) patient population, keeping us on track for data in the second half of next year. And based on recent positive Phase 3 results, we believe donidalorsen, our second planned independent U.S. launch, is positioned to be a preferred choice for people with hereditary angioedema (HAE)," said Brett P. Monia, Ph.D., chief executive officer of Ionis. "We also advanced our next wave of potentially transformational medicines, including announcing plans to independently advance ION582 into a Phase 3 study next year, based on positive data in Angelman syndrome; this program is poised to become the cornerstone of our robust wholly owned neurology pipeline. Our recent achievements, together with multiple upcoming catalysts, position Ionis to deliver next-level value for all stakeholders." Second Quarter 2024 Summary Financial Results(1): Financial Highlights Revenue increased for the second quarter and first half of 2024 by 20% and 8% compared to the same periods last year, respectively, primarily driven by an increase in R&D revenue reflecting the value Ionis' pipeline and technology continues to generate Operating expenses increased in the second quarter and first half of 2024 compared to the same periods last year, reflecting continued strategic investments in late-stage development, including WAINUA for ATTR cardiomyopathy and olezarsen for sHTG, and commercialization efforts for WAINUA, olezarsen and donidalorsen Reaffirmed 2024 financial guidance Recent Marketed Medicines Highlights WAINUA for the treatment of adults with polyneuropathy of hereditary transthyretin-mediated amyloidosis (ATTRv-PN) generated sales of $16 million and $21 million resulting in royalty revenue of $4 million and $5 million in the second quarter and first half of 2024, respectively WAINUA for the treatment of adults with ATTRv-PN approved in Canada SPINRAZA for the treatment of spinal muscular atrophy (SMA) generated global sales of $429 million and $770 million resulting in royalty revenue of $57 million and $95 million in the second quarter and first half of 2024, respectively QALSODY for the treatment of SOD1-ALS granted marketing approval in the EU Recent Late-Stage Pipeline Highlights Olezarsen achieved multiple clinical and regulatory milestones that support pursuit of two patient populations with urgent unmet need, familial chylomicronemia syndrome (FCS) and severe hypertriglyceridemia (sHTG): FDA accepted the NDA for patients with FCS for Priority Review with a PDUFA date of December 19, 2024 Presented positive Phase 3 Balance study data in patients with FCS with a simultaneous publication in the New England Journal of Medicine Opened Expanded Access Program (EAP) for FCS in the U.S. Completed enrollment for all Phase 3 sHTG studies: CORE pivotal study, CORE2 confirmatory pivotal study and ESSENCE supportive exposure study; on track for data across all three studies in H2:2025 Presented positive Phase 2b Bridge study data in patients with HTG and sHTG with a simultaneous publication in the New England Journal of Medicine Donidalorsen achieved multiple clinical milestones positioning it to become the first RNA-targeted prophylactic treatment for people with hereditary angioedema (HAE): Preparing to submit NDA Otsuka preparing to submit MAA; expanded Otsuka EU commercial licensing agreement to include Asia Pacific Presented positive Phase 3 OASIS-HAE study data in patients treated every four weeks or every eight weeks with a simultaneous publication in the New England Journal of Medicine Presented positive Phase 3 OASISplus open-label extension study data in patients treated every four weeks or every eight weeks Presented positive Phase 3 OASISplus switch study data in patients previously treated with other prophylactic therapies Zilganersen (GFAP) Phase 3 study for the treatment of patients with Alexander disease fully enrolled; on track for data in 2025 Bepirovirsen Phase 3 studies for the treatment of patients with chronic hepatitis B (CHB) fully enrolled; on track for data in 2026 Recent Other Pipeline Updates Presented positive Phase 2 data for ION582 (UBE3A), our wholly owned medicine, in patients with Angelman syndrome; preparing for meetings with global regulators ahead of planned Phase 3 study start in H1:2025 Presented positive Phase 2 data for ION224 (DGAT2) in patients with metabolic dysfunction-associated steatohepatitis (MASH) Initiated the Phase 1/2 Orbit study of ION356 (PLP1) in patients with Pelizaeus-Merzbacher disease (PMD) Discontinued development of IONIS-FB-LRx for geographic atrophy (GA) and ION541 for amyotrophic lateral sclerosis (ALS) following completion of Phase 2 studies showing favorable safety profiles and good target engagement, but insufficient efficacy to advance into Phase 3 development Second Quarter 2024 Financial Results "Ionis is at a critical inflection point. We have achieved important development and regulatory milestones for WAINUA, olezarsen and donidalorsen, all of which have significant potential to help patients in need. In parallel, we continue to advance our next wave of potentially transformational medicines," said Elizabeth L. Hougen, chief financial officer of Ionis. "To drive next-level of value creation for all stakeholders, we remain focused on strategically investing our capital to fully unlock the potential of our promising near-and longer-term portfolio. Our investments are focused on go-to-market preparations for our upcoming planned olezarsen and donidalorsen launches. And with our increased confidence in the potential of WAINUA and olezarsen to address broader patient populations, we are planning additional investments to scale our capabilities in line with the significant potential that these important medicines represent. Additionally, we are investing in our next wave of medicines, including pre-commercialization activities and Phase 3 development for ION582 for Angelman syndrome, which we plan to start in the first half of next year. We expect our investments today and in the years ahead will position Ionis for sustainable growth for years to come." Revenue Ionis' revenue was comprised of the following: Commercial revenue in the second quarter and first half of 2024 included a new source of royalty revenue with the launch of WAINUA in the U.S. in late January 2024. Ionis' commercial revenue in the second quarter and first half of 2024 also included royalties from the net sales of QALSODY, which Biogen launched in the U.S. in the second quarter of 2023 and in the EU in the second quarter of 2024. R&D revenue in the second quarter and first half of 2024 increased compared to the same periods last year primarily due to the amortization of upfront payments from the new collaborations with Roche and Novartis that Ionis entered into during the second half of last year. In addition, license fees increased year over year as a result of new collaborations Ionis entered into during the second quarter of 2024, including the expanded donidalorsen licensing agreement with Otsuka, which now includes the Asia-Pacific region in addition to Europe. These increases were partially offset by the decrease in WAINUA joint development revenue, which decreased as development activities relating to ATTRv-PN wound down with the launch of WAINUA for this indication. Operating Expenses Ionis' operating expenses increased in the second quarter and first half of 2024 compared to the same periods in 2023, consistent with expectations. SG&A expenses increased year over year primarily due to the launch of WAINUA in the U.S. and launch preparation activities for olezarsen and donidalorsen, including establishing the field team for olezarsen. R&D expenses decreased in the second quarter and were essentially flat in the first half of 2024 compared to the same periods last year as several late-stage studies have ended. Balance Sheet As of June 30, 2024, Ionis' cash, cash equivalents and short-term investments decreased to $2.1 billion compared to $2.3 billion at December 31, 2023. The Company plans to continue deploying its capital resources toward growth opportunities, and as previously guided, projects to end 2024 with $1.7 billion in cash, cash equivalents and short-term investments. Ionis' working capital also decreased over the same period primarily due to the Company's lower cash and short-term investments balance. We expect to make increased strategic investments in the years ahead, with a focus on late-stage programs, wholly owned assets, and our next wave of innovative medicines. Webcast Management will host a conference call and webcast to discuss Ionis' second quarter 2024 results at 11:30 a.m. Eastern time on Thursday, August 1, 2024. Interested parties may access the webcast here. A webcast replay will be available for a limited time at the same address. To access the Company's second quarter 2024 earnings slides click here. For more information about SPINRAZA and QALSODY, visit and , respectively. QALSODY is approved under accelerated approval based on reduction in plasma neurofilament light chain (NfL) observed in patients treated with QALSODY. Continued approval may be contingent upon verification of clinical benefit in confirmatory trial(s). INDICATION for WAINUA™ (eplontersen) WAINUA injection, for subcutaneous use, 45 mg is indicated for the treatment of the polyneuropathy of hereditary transthyretin-mediated amyloidosis in adults. IMPORTANT SAFETY INFORMATION for WAINUA™ (eplontersen) WARNINGS AND PRECAUTIONS Reduced Serum Vitamin A Levels and Recommended Supplementation WAINUA leads to a decrease in serum vitamin A levels. Supplement with recommended daily allowance of vitamin A. Refer patient to an ophthalmologist if ocular symptoms suggestive of vitamin A deficiency occur. ADVERSE REACTIONS Most common adverse reactions (≥9% in WAINUA-treated patients) were vitamin A decreased (15%) and vomiting (9%). Please see link to U.S. Full Prescribing Information for WAINUA. About Ionis Pharmaceuticals, Inc. For three decades, Ionis has invented medicines that bring better futures to people with serious diseases. Ionis currently has five marketed medicines and a leading pipeline in neurology, cardiology, and other areas of high patient need. As the pioneer in RNA-targeted medicines, Ionis continues to drive innovation in RNA therapies in addition to advancing new approaches in gene editing. A deep understanding of disease biology and industry-leading technology propels our work, coupled with a passion and urgency to deliver life-changing advances for patients. To learn more about Ionis, visit Ionis.com and follow us on X (Twitter) and LinkedIn. Ionis' Forward-looking Statement This press release includes forward-looking statements regarding Ionis' business, financial guidance and the therapeutic and commercial potential of our commercial medicines, additional medicines in development and technologies. 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 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. Except as required by law, we undertake no obligation to update any forward-looking statements for any reason. 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, 2023, and most recent Form 10-Q, which are on file with the Securities and Exchange Commission. Copies of these and other documents are available from the Company. In this press release, unless the context requires otherwise, "Ionis," "Company," "we," "our" and "us" all refer 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 registered trademark of Akcea Therapeutics, Inc. WAYLIVRA® is a registered trademark of Akcea Therapeutics, Inc. SPINRAZA® and QALSODY® are registered trademarks of Biogen. WAINUATM is a registered trademark of the AstraZeneca group of companies. Ionis Investor Contact: D. Wade Walke, Ph.D. [email protected] 760-603-2331 Ionis Media Contact: Hayley Soffer [email protected] 760-603-4679 Reconciliation of GAAP to Non-GAAP Basis As illustrated in the Selected Financial Information in this press release, non-GAAP operating expenses, non-GAAP loss from operations, and non-GAAP net loss were adjusted from GAAP to exclude compensation expense related to equity awards and the related tax effects. Compensation expense related to equity awards are non-cash. These measures are provided as supplementary information and are not a substitute for financial measures calculated in accordance with GAAP. Ionis reports these non-GAAP results to better enable financial statement users to assess and compare its historical performance and project its future operating results and cash flows. Further, the presentation of Ionis' non-GAAP results is consistent with how Ionis' management internally evaluates the performance of its operations. Key 2024 Value Driving Events(1) SOURCE Ionis Pharmaceuticals, Inc.