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R&D Highlights

• Submitted a supplemental New Drug Application (sNDA) to the U.S. Food and Drug Administration (FDA) using a Priority Review Voucher for vutrisiran for the treatment of ATTR amyloidosis with cardiomyopathy. Parallel filings for regulatory approval have also been submitted in all major regions, including Europe and Japan.

  • The FDA has accepted the sNDA and set an action goal date of March 23, 2025, under the Prescription Drug User Fee Act (PDUFA).

• Received United States Food & Drug Administration (FDA) Orphan Drug Designation for nucresiran (ALN-TTRsc04) and announced positive interim Phase 1 data in patients with ATTR amyloidosis.

• Announced positive initial results from the multiple dose portion of the Phase 1 study of mivelsiran in patients with Alzheimer’s disease.

• Initiated a Phase 1 study of ALN-HTT02 in adult patients with Huntington’s disease.

• Completed enrollment in the KARDIA-3 Phase 2 study of zilebesiran, and initiated a Phase 1 study of zilebesiran + REVERSIR for hypertension.

• Initiated Phase 1 studies of ALN-6400 for a bleeding disorder, and ALN-4324 for type 2 diabetes mellitus.

• Alnylam's partner, Regeneron Pharmaceuticals, reported positive updated Phase 3 data from an exploratory cohort in the ACCESS-1 trial investigating its first-in-class pozelimab and cemdisiran combination treatment compared to standard-of-care ravulizumab in patients with paroxysmal nocturnal hemoglobinuria (PNH) at the American Society of Hematology 2024 Annual Meeting.

Upcoming Events

Alnylam will host an R&D Day on February 25, 2025 at 9:00 am ET in New York City. This event, which will be webcast live on the Investors section of the Company’s website, www.alnylam.com, will showcase Alnylam’s robust pipeline comprising numerous multi-billion-dollar opportunities and highlight RNAi platform innovation driving the next era of growth. A replay will be available on the Company's website within 48 hours after the event.

The PDUFA target action date for the sNDA for vutrisiran is March 23, 2025.

Alnylam intends to initiate a Phase 3 study of nucresiran in patients with ATTR amyloidosis with cardiomyopathy in the first half of 2025.

The PDUFA target action date for fitusiran, an investigational RNAi therapeutic in development for the treatment of hemophilia A and B, with or without inhibitors, is March 28, 2025. Fitusiran is being advanced by Alnylam’s partner Sanofi. Assuming approval, Alnylam is eligible to receive tiered royalties of between 15 and 30 percent on global net sales of fitusiran.

Alnylam’s partner, Vir Biotechnology, expects to initiate a Phase 3 chronic hepatitis delta registrational study of elebsiran and to report functional cure results from a Phase 2 chronic hepatitis B study of elebsiran in 2025.

Financial Highlights for the Fourth Quarter and Year End 2024

Net Product Revenues

• Net product revenues increased 30% and 33% at actual currency during the three and twelve months ended December 31, 2024, respectively, compared to the same periods in 2023, and 29% and 33% at CER, respectively. The increases are primarily due to growth from sales of AMVUTTRA driven by increased patient demand, partially offset by a decrease in sales of ONPATTRO due to patient switches to AMVUTTRA, as well as increased patients on GIVLAARI and OXLUMO therapies.

Net Revenues from Collaborations

• Net revenues from collaborations increased $30.5 million during the three months ended December 31, 2024, as compared to the same period in 2023, primarily due to the timing of manufacturing activities under our collaboration with Regeneron, as well as revenue recognized under our license agreement with Novartis associated with the achievement of specified commercialization milestones.

• Net revenues from collaborations decreased by $36.0 million during the twelve months ended December 31, 2024, as compared to the same period in 2023, primarily due to differences in certain revenue items between 2023 and 2024. During 2023, we recognized $310.0 million of revenue from the upfront payment received from Roche in connection with execution of our zilebesiran collaboration. In comparison, during 2024, we recognized $185.0 million in revenues under our collaboration with Regeneron as we modified the collaboration in June 2024 and provided Regeneron with an exclusive license to develop, manufacture and commercialize cemdisiran as a monotherapy.

Operating Expenses

Cost of Goods Sold

• Cost of goods sold as a percentage of net product revenues increased during the three months ended December 31, 2024, as compared to the same period in the prior year, primarily due to higher royalty rates payable on net sales of AMVUTTRA.

• Cost of goods sold as a percentage of net product revenues decreased during the twelve months ended December 31, 2024, as compared to the same period in the prior year. Approximately 5.0% of the 21.6% of cost of goods sold as a percentage of net product revenues for the year ended December 31, 2023 was attributable to cancelled manufacturing commitments and the impairment of ONPATTRO inventory that had been manufactured for future demand associated with the use of ONPATTRO for the treatment of patients with ATTR amyloidosis with cardiomyopathy, for which we did not receive regulatory approval in the U.S. These one-time charges in 2023 did not recur in 2024, resulting in the decrease in cost of goods sold as a percentage of net product revenues in 2024, which was partially offset by higher volume and royalty rates payable on net sales of AMVUTTRA in 2024.

Research & Development (R&D) Expenses

• GAAP and non-GAAP R&D expenses increased during the three and twelve months ended December 31, 2024, compared to the same periods in 2023, primarily due to increased costs associated with our preclinical activities as we develop our clinical pipeline of RNAi therapeutics targeting multiple tissues, increased clinical trial expenses associated with increased Phase 2 activities for the zilebesiran KARDIA-3 and mivelsiran cAPPRicorn-1 clinical trials, and increased employee compensation expenses. GAAP R&D expenses further increased during the three and twelve months ended December 31, 2024, compared to the same periods in 2023, due to higher stock-based compensation expense in 2024.

Selling, General & Administrative (SG&A) Expenses

• GAAP and non-GAAP SG&A expenses increased during the three and twelve months ended December 31, 2024, compared to the same periods in 2023, primarily due to higher costs associated with marketing investments to promote our TTR therapies and prepare for the potential launch of AMVUTTRA for the treatment of ATTR amyloidosis with cardiomyopathy and increased employee compensation expenses.

Benefit from (provision for) income taxes

• During the year ended December 31, 2024, we recorded a net benefit from income taxes of $99.2 million. This is primarily comprised of $106.8 million of foreign deferred benefit, partially offset by $1.6 million of domestic state current provision and $5.9 million of foreign current provision.

Other Financial Highlights

• Cash, cash equivalents and marketable securities were $2.69 billion as of December 31, 2024, as compared to $2.44 billion as of December 31, 2023, with the increase primarily due to improved operating performance and increased net proceeds from the issuance of common stock in connection with stock option exercises.

A reconciliation of our GAAP to non-GAAP results for the three and twelve months ended December 31, 2024 and 2023, is included in the tables of this press release.

2025 Financial Guidance

Our full-year 2025 financial guidance is summarized below:

Use of Non-GAAP Financial Measures

This press release contains non-GAAP financial measures, including adjustments to exclude certain non-cash items and non-recurring transactions or events outside the ordinary course of the Company’s business. These measures are not in accordance with, or an alternative to, GAAP, and may be different from non-GAAP financial measures used by other companies.

The items included in GAAP presentations but excluded for purposes of determining non-GAAP financial measures for the periods presented in this press release are stock-based compensation expenses and realized and unrealized gains and losses on marketable equity securities. The Company has excluded the impact of stock-based compensation expense, which may fluctuate from period to period based on factors including the variability associated with performance-based grants for stock options and restricted stock units and changes in the Company’s stock price, which impacts the fair value of these awards. The Company has excluded the impact of the realized and unrealized gains and losses on marketable equity securities because the Company does not believe these adjustments accurately reflect the performance of the Company’s ongoing operations for the period in which such gains or losses are reported, as their sole purpose is to adjust amounts on the balance sheet.

Percentage changes in revenue growth at CER are presented excluding the impact of changes in foreign currency exchange rates for investors to understand the underlying business performance. The current period’s foreign currency revenue values are converted into U.S. dollars using the average exchange rates from the prior period.

The Company believes the presentation of non-GAAP financial measures provides useful information to management and investors regarding the Company’s financial condition and results of operations. When GAAP financial measures are viewed in conjunction with non-GAAP financial measures, investors are provided with a more meaningful understanding of the Company’s ongoing operating performance and are better able to compare the Company’s performance between periods. Non-GAAP financial measures are not intended to be considered in isolation or as a substitute for GAAP financial measures. A reconciliation between GAAP and non-GAAP measures is provided later in this press release.

Conference Call Information

Management will provide an update on the Company and discuss fourth quarter and full year 2024 results as well as expectations for the future via conference call on Thursday, February 13, 2025 at 8:30 am ET. A live audio webcast of the call will be available on the Investors section of the Company’s website at www.alnylam.com/events. An archived webcast will be available on the Alnylam website approximately two hours after the event.

About ONPATTRO^® (patisiran)

ONPATTRO is an RNAi therapeutic that is approved in the United States and Canada for the treatment of adults with hATTR amyloidosis with polyneuropathy. ONPATTRO is also approved in the European Union, Switzerland and Brazil for the treatment of hATTR amyloidosis in adults with Stage 1 or Stage 2 polyneuropathy, and in Japan for the treatment of hATTR amyloidosis with polyneuropathy. ONPATTRO is an intravenously administered RNAi therapeutic targeting transthyretin (TTR). It is designed to target and silence TTR messenger RNA, thereby reducing the production of TTR protein before it is made. Reducing the pathogenic protein leads to a reduction in amyloid deposits in tissues. For more information about ONPATTRO, including full Prescribing Information, visit ONPATTRO.com.

About AMVUTTRA^® (vutrisiran)

AMVUTTRA^® (vutrisiran) is an RNAi therapeutic that delivers rapid knockdown of mutant and wild-type transthyretin (TTR), addressing the underlying cause of transthyretin (ATTR) amyloidosis. Administered quarterly via subcutaneous injection, AMVUTTRA is approved and marketed in more than 15 countries for the treatment of the polyneuropathy of hereditary transthyretin-mediated amyloidosis (hATTR-PN) in adults. Vutrisiran is also in development for the treatment of ATTR amyloidosis with cardiomyopathy (ATTR-CM), which encompasses both wild-type and hereditary forms of the disease. For more information about AMVUTTRA, including the full U.S. Prescribing Information, visit AMVUTTRA.com.

About GIVLAARI^® (givosiran)

GIVLAARI (givosiran) is an RNAi therapeutic targeting aminolevulinic acid synthase 1 (ALAS1) approved in the United States and Brazil for the treatment of adults with acute hepatic porphyria (AHP). GIVLAARI is also approved in the European Union for the treatment of AHP in adults and adolescents aged 12 years and older. In the pivotal study, GIVLAARI was shown to significantly reduce the rate of porphyria attacks that required hospitalizations, urgent healthcare visits or intravenous hemin administration at home compared to placebo. GIVLAARI is Alnylam’s first commercially available therapeutic based on its Enhanced Stabilization Chemistry ESC-GalNAc conjugate technology to increase potency and durability. GIVLAARI is administered via subcutaneous injection once monthly at a dose based on actual body weight and should be administered by a healthcare professional. GIVLAARI works by specifically reducing elevated levels of ALAS1 messenger RNA (mRNA), leading to reduction of toxins associated with attacks and other disease manifestations of AHP. For more information about GIVLAARI, including the full U.S. Prescribing Information, visit GIVLAARI.com.

About OXLUMO^® (lumasiran)

OXLUMO (lumasiran) is an RNAi therapeutic targeting hydroxyacid oxidase 1 (HAO1). HAO1 encodes glycolate oxidase (GO). Thus, by silencing HAO1 and depleting the GO enzyme, OXLUMO inhibits production of oxalate – the metabolite that directly contributes to the pathophysiology of PH1. OXLUMO utilizes Alnylam’s Enhanced Stabilization Chemistry (ESC)-GalNAc-conjugate technology, which enables subcutaneous dosing with increased potency and durability and a wide therapeutic index. OXLUMO has received regulatory approvals from the U.S. Food and Drug Administration (FDA) for the treatment of primary hyperoxaluria type 1 (PH1) to lower urinary and plasma oxalate levels in pediatric and adult patients and from the European Medicines Agency (EMA) for the treatment of PH1 in all age groups. In the pivotal ILLUMINATE-A study, OXLUMO was shown to significantly reduce levels of urinary oxalate relative to placebo, with the majority of patients reaching normal or near-normal levels. In the ILLUMINATE-B pediatric Phase 3 study, OXLUMO demonstrated an efficacy and safety profile consistent to that observed in ILLUMINATE-A. In the ILLUMINATE-C study, OXLUMO resulted in substantial reductions in plasma oxalate in patients with advanced PH1. Across all three studies, injection site reactions (ISRs) were the most common drug-related adverse reaction. OXLUMO is administered via subcutaneous injection once monthly for three months, then once quarterly beginning one month after the last loading dose at a dose based on actual body weight. For patients who weigh less than 10 kg, ongoing dosing remains monthly. OXLUMO should be administered by a healthcare professional. For more information about OXLUMO, including the full U.S. Prescribing Information, visit OXLUMO.com.

About LNP Technology

Alnylam has licenses to Arbutus Biopharma lipid nanoparticle (LNP) intellectual property for use in RNAi therapeutic products using LNP technology.

About RNAi

RNAi (RNA interference) is a natural cellular process of gene silencing that represents one of the most promising and rapidly advancing frontiers in biology and drug development today. Its discovery has been heralded as "a major scientific breakthrough that happens once every decade or so," and was recognized with the award of the 2006 Nobel Prize for Physiology or Medicine. By harnessing the natural biological process of RNAi occurring in our cells, a new class of medicines known as RNAi therapeutics is now a reality. Small interfering RNA (siRNA), the molecules that mediate RNAi and comprise Alnylam’s RNAi therapeutic platform, function upstream of today’s medicines by potently silencing messenger RNA (mRNA) – the genetic precursors – that encode for disease-causing or disease pathway proteins, thus preventing them from being made. This revolutionary approach has transformed the care of patients with genetic and other diseases.

About Alnylam Pharmaceuticals

Alnylam Pharmaceuticals (Nasdaq: ALNY) has led the translation of RNA interference (RNAi) into a whole new class of innovative medicines for people afflicted with rare and prevalent diseases with unmet need. Based on Nobel Prize-winning science, RNAi therapeutics represent a powerful, clinically validated approach yielding transformative medicines. Since its founding in 2002, Alnylam has led the RNAi revolution and continues to deliver on a bold vision to turn scientific possibility into reality. Alnylam’s commercial RNAi therapeutic products are ONPATTRO^® (patisiran), AMVUTTRA^® (vutrisiran), GIVLAARI^® (givosiran), OXLUMO^® (lumasiran), and Leqvio^® (inclisiran), which is being developed and commercialized by Alnylam’s partner, Novartis. Alnylam has a deep pipeline of investigational medicines, including multiple product candidates that are in late-stage development. Alnylam is executing on its "Alnylam P⁵x25" strategy to deliver transformative medicines in both rare and common diseases benefiting patients around the world through sustainable innovation and exceptional financial performance, resulting in a leading biotech profile. Alnylam is headquartered in Cambridge, MA. For more information about our people, science and pipeline, please visit www.alnylam.com and engage with us on X (formerly Twitter) at @Alnylam, or on LinkedIn, Facebook, or Instagram.

Alnylam Forward Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than historical statements of fact regarding Alnylam’s expectations, beliefs, goals, plans or prospects including, without limitation, statements regarding Alnylam’s expectations regarding the potential approval and launch of AMVUTTRA for the treatment of ATTR amyloidosis with cardiomyopathy in the U.S. in early 2025 and in other countries later in 2025; Alnylam’s advancement towards its "Alnylam P⁵x25" goals and positioning to deliver sustainable innovation to patients for the next half of the decade; the potential for Alnylam to advance its research and development programs, including the number of high-value programs Alnylam will have in the clinic by the end of 2025 and the timing of Alnylam’s initiation of a Phase 3 clinical trial of nucresiran in ATTR-CM; the advancement of fitusiran through regulatory review and approval and Alnylam’s receipt of any royalties on sales of fitusiran; and Alnylam’s projected commercial and financial performance, including the expected range of net product revenues and net revenues from collaborations and royalties for 2025 and the expected range of aggregate annual GAAP and non-GAAP R&D and SG&A expenses for 2025, should be considered forward-looking statements. Actual results and future plans may differ materially from those indicated by these forward-looking statements as a result of various important risks, uncertainties and other factors, including, without limitation, risks and uncertainties relating to: Alnylam’s ability to successfully execute on its "Alnylam P⁵x25" strategy; Alnylam’s ability to discover and develop novel drug candidates and delivery approaches and successfully demonstrate the efficacy and safety of its product candidates; the pre-clinical and clinical results for Alnylam’s product candidates, including vutrisiran, zilebesiran, nucresiran and mivelsiran; actions or advice of regulatory agencies and Alnylam’s ability to obtain and maintain regulatory approval for its product candidates, including vutrisiran, as well as favorable pricing and reimbursement; successfully launching, marketing and selling Alnylam’s approved products globally; delays, interruptions or failures in the manufacture and supply of Alnylam’s product candidates or its marketed products; obtaining, maintaining and protecting intellectual property; Alnylam’s ability to successfully expand the approved indications for AMVUTTRA in the future; Alnylam’s ability to manage its growth and operating expenses through disciplined investment in operations and its ability to achieve a self-sustainable financial profile; Alnylam’s ability to maintain strategic business collaborations; Alnylam’s dependence on third parties for the development and commercialization of certain products, including Roche, Novartis, Sanofi, Regeneron and Vir; the outcome of litigation; the risk of future government investigations; and unexpected expenditures; as well as those risks and uncertainties more fully discussed in the "Risk Factors" filed with Alnylam’s most recent Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (SEC), as may be updated from time to time in other filings that Alnylam makes with the SEC. In addition, any forward-looking statements represent Alnylam’s views only as of today and should not be relied upon as representing its views as of any subsequent date. Alnylam explicitly disclaims any obligation, except to the extent required by law, to update any forward-looking statements.

This release discusses investigational RNAi therapeutics and uses of previously approved RNAi therapeutics in development and is not intended to convey conclusions about efficacy or safety as to those investigational therapeutics or uses. Vutrisiran has not been approved by any regulatory agency for the treatment of ATTR amyloidosis with cardiomyopathy. No conclusions can or should be drawn regarding its safety or effectiveness in treating cardiomyopathy in this population. There is no guarantee that any investigational therapeutics or expanded uses of commercial products will successfully complete clinical development or gain health authority approval.

This selected financial information should be read in conjunction with the consolidated financial statements and notes thereto included in Alnylam’s Annual Report on Form 10-K which includes the audited financial statements for the year ended December 31, 2024.

Please note that the figures presented above may not sum exactly due to rounding

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Contacts

Alnylam Pharmaceuticals, Inc.

Christine Regan Lindenboom
(Investors and Media)
617-682-4340

Josh Brodsky
(Investors)
617-551-8276