PTC THERAPEUTICS INC

Previous wording

The following discussion and analysis is meant to provide material information relevant to an assessment of the financial condition and results of operations of our company, including an evaluation of the amounts and certainty of cash flows from operations and from outside resources, so as to allow investors to better view our company from management’s perspective. The following discussion of our financial condition and results of operations should be read in conjunction with our financial statements and the notes to those financial statements appearing elsewhere in this Quarterly Report on Form 10-Q and the audited consolidated financial statements and notes thereto and management’s discussion and analysis of financial condition and results of operations for the year ended December 31, 2023 included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 29, 2024, as amended, or our 2023 Annual Report. This discussion contains forward-looking statements that involve significant risks and uncertainties. As a result of many factors, such as those set forth in Part II, Item 1A. (Risk Factors) of this Quarterly Report on Form 10-Q and Part I, Item 1A. (Risk Factors) of our 2023 Annual Report, our actual results may differ materially from those anticipated in these forward-looking statements.

Current wording

The following discussion and analysis is meant to provide material information relevant to an assessment of the financial condition and results of operations of our company, including an evaluation of the amounts and certainty of cash flows from operations and from outside resources, so as to allow investors to better view our company from management’s perspective. The following discussion of our financial condition and results of operations should be read in conjunction with our financial statements and the notes to those financial statements appearing elsewhere in this Quarterly Report on Form 10-Q and the audited consolidated financial statements and notes thereto and management’s discussion and analysis of financial condition and results of operations for the year ended December 31, 2024 included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 27, 2025, or our 2024 Annual Report. This discussion contains forward-looking statements that involve significant risks and uncertainties. As a result of many factors, such as those set forth in Part II, Item 1A. (Risk Factors) of this Quarterly Report on Form 10-Q and Part I, Item 1A. (Risk Factors) of our 2024 Annual Report, our actual results may differ materially from those anticipated in these forward-looking statements.

Previous wording

We are a global biopharmaceutical company focused on the discovery, development and commercialization of clinically differentiated medicines that provide benefits to children and adults living with rare disorders. Our ability to innovate to identify new therapies and to globally commercialize products is the foundation that drives investment in a robust and diversified pipeline of transformative medicines. Our mission is to provide access to best-in-class treatments for patients who have little to no treatment options. Our strategy is to leverage our strong scientific and clinical expertise and global commercial infrastructure to bring therapies to patients. We believe that this allows us to maximize value for all our stakeholders. We have a diversified therapeutic portfolio pipeline that includes several commercial products and product candidates in various stages of development, including clinical, pre-clinical and research and discovery stages, focused on the development of new treatments for multiple therapeutic areas for rare diseases relating to neurology and metabolism.

Current wording

We are a global biopharmaceutical company that discovers, develops and commercializes clinically differentiated medicines that provide benefits to children and adults living with rare disorders. Our ability to innovate to identify new therapies and to globally commercialize products is the foundation that drives investment in a robust and diversified pipeline of transformative medicines. Our mission is to provide access to best-in-class treatments for patients who have little to no treatment options. Our strategy is to leverage our strong scientific and clinical expertise and global commercial infrastructure to bring therapies to patients. We believe that this allows us to maximize value for all of our stakeholders. We have a diversified therapeutic portfolio that includes several commercial products and product candidates in various stages of development, including clinical, pre-clinical and research and discovery stages, focused on the development of new treatments for multiple therapeutic areas for rare diseases relating to neurology and metabolism.

Previous wording

We have two products, Translarna™ (ataluren) and Emflaza® (deflazacort), for the treatment of Duchenne muscular dystrophy, or DMD, a rare, life-threatening disorder. Translarna currently has conditional marketing authorization in the European Economic Area, or EEA, for the treatment of nonsense mutation Duchenne muscular dystrophy, or nmDMD, in ambulatory patients aged two years and older. Translarna also has marketing authorization in Russia for the treatment of nmDMD in patients aged two years and older, and in Brazil for the treatment of nmDMD in ambulatory patients two years and older and for continued treatment of patients that become non-ambulatory, as well as in various other countries. During the quarter ended September 30, 2024, we recognized $72.3 million in net sales of Translarna. We hold worldwide commercialization rights to Translarna for all indications in all territories. Emflaza is approved in the United States for the treatment of DMD in patients two years and older. During the quarter ended September 30, 2024, we recognized $51.9 million in net sales of Emflaza.

Current wording

We have two products, Translarna™ (ataluren) and Emflaza® (deflazacort), for the treatment of Duchenne muscular dystrophy, or DMD, a rare, life-threatening disorder. Translarna has marketing authorization in Russia for the treatment of nonsense mutation Duchenne muscular dystrophy, or nmDMD, in patients aged two years and older, and in Brazil for the treatment of nmDMD in ambulatory patients two years and older and for continued treatment of patients that become non-ambulatory, as well as in various other countries. During the quarter ended March 31, 2025, we recognized $86.2 million in net sales of Translarna. We hold worldwide commercialization rights to Translarna for all indications in all territories. Emflaza is approved in the United States for the treatment of DMD in patients two years and older. During the quarter ended March 31, 2025, we recognized $47.8 million in net sales of Emflaza.

Previous wording

Our marketing authorization for Translarna in the EEA is subject to annual review and renewal by the European Commission, or EC, following reassessment by the European Medicines Agency, or EMA, of the benefit-risk balance of the authorization, which we refer to as the annual EMA reassessment. In September 2022, we submitted a Type II variation to the EMA to support conversion of the conditional marketing authorization for Translarna to a standard marketing authorization, which included a report on the placebo-controlled trial of Study 041 and data from the open-label extension as further described below. Study 041 was an 18-month, placebo-controlled trial, followed by an 18-month open-label extension of Translarna in the treatment of ambulatory patients with nmDMD aged five years or older. In February 2023, we also submitted an annual marketing authorization renewal request to the EMA. In September 2023, the Committee for Medicinal Products for Human Use, or CHMP, gave a negative opinion on the conversion of the conditional marketing authorization to full marketing authorization of Translarna for the treatment of nmDMD and a negative opinion on the

Current wording

We previously had a marketing authorization for Translarna in the European Economic Area, or EEA, which had been subject to annual review and renewal by the European Commission, or EC, following reassessment by the European Medicines Agency, or EMA, of the benefit-risk balance of the authorization. In September 2022, we submitted a Type II variation to the EMA to support conversion of the conditional marketing authorization for Translarna to a standard marketing authorization, which included a report on the placebo-controlled trial of Study 041 and data from the open-label extension as further described below. Study 041 was an 18-month, placebo-controlled trial, followed by an 18-month open-label extension of Translarna in the treatment of ambulatory patients with nmDMD aged five years or older. In February 2023, we also submitted an annual marketing authorization renewal request to the EMA. In September 2023, the Committee for Medicinal Products for Human Use, or CHMP, gave a negative opinion on the conversion of the conditional marketing authorization to full marketing authorization of Translarna for the treatment of nmDMD and a negative opinion on the renewal of the existing conditional marketing authorization of Translarna for the treatment of nmDMD. In January 2024, the CHMP issued a negative opinion for the renewal of the conditional marketing authorization following a re-

Previous wording

renewal of the existing conditional marketing authorization of Translarna for the treatment of nmDMD. In January 2024, the CHMP issued a negative opinion for the renewal of the conditional marketing authorization following a re-examination procedure. In May 2024, the EC decided not to adopt the CHMP’s negative opinion for the renewal of the conditional marketing authorization of Translarna and returned such opinion to the CHMP for re-evaluation. In June 2024, following the EC’s request for re-review, the CHMP issued a negative opinion on the renewal of the conditional marketing authorization of Translarna for the treatment of nmDMD. On October 18, 2024, the CHMP maintained its negative opinion for the renewal of the conditional marketing authorization following the requested reexamination procedure. In accordance with EMA regulations, the opinion will be reviewed by the EC which is expected to decide on opinion adoption approximately 67 days from the date of issuance. If the EC adopts the negative opinion, Translarna would no longer have marketing authorization in the member states of the EEA. The marketing authorization for Translarna remains in effect, pending the EC’s potential adoption of the negative opinion. Based on the timeline of these procedures, we expect the marketing authorization for Translarna to remain in effect approximately through the end of 2024. We are exploring other potential mechanisms by which we may provide Translarna to nmDMD patients in the EEA if the negative opinion is adopted by the EC.

Current wording

examination procedure. In May 2024, the EC decided not to adopt the CHMP’s negative opinion for the renewal of the conditional marketing authorization of Translarna and returned such opinion to the CHMP for re-evaluation. In June 2024, following the EC’s request for re-review, the CHMP issued a negative opinion on the renewal of the conditional marketing authorization of Translarna for the treatment of nmDMD. In October 2024, the CHMP maintained its negative opinion for the renewal of the conditional marketing authorization following the requested reexamination procedure. On March 28, 2025, the EC adopted the opinion of the CHMP to not renew the authorization of Translarna for the treatment of nmDMD. While this action effectively removed the drug’s conditional marketing authorization in the EEA, the EC indicated that individual countries within the European Union, or EU, can leverage Articles 117(3) and 5(1) of the EU Directive 2001/83 to allow continued commercial use of Translarna. There is a substantial risk that as a result of the EC’s adoption of the CHMP’s negative opinion we will lose all, or a significant portion of, our ability to generate revenue from sales of Translarna in the EEA.

Previous wording

Translarna is an investigational new drug in the United States. During the first quarter of 2017, we filed a New Drug Application, or NDA, for Translarna for the treatment of nmDMD over protest with the United States Food and Drug Administration, or FDA. In October 2017, the Office of Drug Evaluation I of the FDA issued a Complete Response Letter for the NDA, stating that it was unable to approve the application in its current form. In response, we filed a formal dispute resolution request with the Office of New Drugs of the FDA. In February 2018, the Office of New Drugs of the FDA denied our appeal of the Complete Response Letter. In its response, the Office of New Drugs recommended a possible path forward for the ataluren NDA submission based on the accelerated approval pathway. This would involve a re-submission of an NDA containing the current data on effectiveness of ataluren with new data to be generated on dystrophin production in nmDMD patients’ muscles. We followed the FDA’s recommendation and collected, using newer technologies via procedures and methods that we designed, such dystrophin data in a new study, Study 045, and announced the results of Study 045 in February 2021. Study 045 did not meet its pre-specified primary endpoint. In June 2022, we announced top-line results from the placebo-controlled trial of Study 041. Following this announcement, we submitted a meeting request to the FDA to gain clarity on the regulatory pathway for a potential re-submission of an NDA for Translarna. The FDA provided initial written feedback that Study 041 does not provide substantial evidence of effectiveness to support NDA re-submission. We held a Type C meeting with the FDA in the fourth quarter of 2023 to discuss the totality of Translarna data. Based on feedback from the FDA, we re-submitted the NDA in July 2024, based on the results from Study 041 and from our international drug registry study for nmDMD patients receiving Translarna. In October 2024, the FDA accepted for review the resubmission of the NDA for Translarna for the treatment of nmDMD. As this was an NDA resubmission following a complete response letter to the NDA which was filed over protest in 2016, the FDA is not obligated to follow the review timelines under Prescription Drug User Free Act guidelines and an action date has not been provided.

Current wording

Translarna is an investigational new drug in the United States. During the first quarter of 2017, we filed a New Drug Application, or NDA, for Translarna for the treatment of nmDMD over protest with the United States Food and Drug Administration, or FDA. In October 2017, the Office of Drug Evaluation I of the FDA issued a Complete Response Letter, or CRL, for the NDA, stating that it was unable to approve the application in its current form. In response, we filed a formal dispute resolution request with the Office of New Drugs of the FDA. In February 2018, the Office of New Drugs of the FDA denied our appeal of the CRL. In its response, the Office of New Drugs recommended a possible path forward for the ataluren NDA submission based on the accelerated approval pathway. This would involve a resubmission of an NDA containing the current data on effectiveness of ataluren with new data to be generated on dystrophin production in nmDMD patients’ muscles. We followed the FDA’s recommendation and collected, using newer technologies via procedures and methods that we designed, such dystrophin data in a new study, Study 045, and announced the results of Study 045 in February 2021. Study 045 did not meet its pre-specified primary endpoint. In June 2022, we announced top-line results from the placebo-controlled trial of Study 041. Following this announcement, we submitted a meeting request to the FDA to gain clarity on the regulatory pathway for a potential resubmission of an NDA for Translarna. The FDA provided initial written feedback that Study 041 does not provide substantial evidence of effectiveness to support an NDA resubmission. We held a Type C meeting with the FDA in the fourth quarter of 2023 to discuss the totality of Translarna data. Based on feedback from the FDA, we resubmitted the NDA in July 2024, based on the results from Study 041 and from our international drug registry study for nmDMD patients receiving Translarna. In October 2024, the FDA accepted for review the resubmission of the NDA for Translarna for the treatment of nmDMD. As this was an NDA resubmission following a complete response letter to the NDA which was filed over protest in 2016, the FDA is not obligated to follow the review timelines under Prescription Drug User Free Act guidelines and an action date has not been provided.

Previous wording

Emflaza’s seven-year period of orphan drug exclusivity related to the treatment of DMD in patients five years and older expired in February 2024. We expect the expiration of this orphan drug exclusivity to have a significant negative impact on Emflaza net product revenue. Emflaza’s orphan drug exclusivity related to the treatment of DMD in patients two years of age to less than five expires in June 2026.

Current wording

We have previously relied on Emflaza’s seven-year marketing exclusivity period in the United States for its approved indications under the provisions of the Orphan Drug Act of 1983, or the Orphan Drug Act, when commercializing Emflaza. Emflaza’s seven-year period of orphan drug exclusivity related to the treatment of DMD in patients five years and older expired in February 2024. We expect the expiration of this orphan drug exclusivity to potentially have a significant negative impact on Emflaza net product revenue. Emflaza’s orphan drug exclusivity related to the treatment of DMD in patients two years of age to less than five expires in June 2026.

Previous wording

Our product Upstaza is a gene therapy used for the treatment of Aromatic L-Amino Decarboxylase, or AADC, deficiency, a rare central nervous system, or CNS, disorder arising from reductions in the enzyme AADC that results from mutations in the dopa decarboxylase gene. In July 2022, the EC approved Upstaza for the treatment of AADC deficiency for patients 18 months and older within the EEA. In November 2022, the Medicines and Healthcare Products Regulatory Agency approved Upstaza for the treatment of AADC deficiency for patients 18 months and older within the United Kingdom. In March 2024, we submitted a biologics license application, or BLA, to the FDA for eladocagene exuparvovec for the treatment of AADC deficiency in the United States. In May 2024, the FDA accepted for filing the BLA for eladocagene exuparvovec for the treatment of AADC deficiency and granted priority review with a target regulatory action date of November 13, 2024.

Current wording

Upstaza/Kebilidi is a gene therapy for the treatment of Aromatic L Amino Decarboxylase, or AADC, deficiency, a rare central nervous system, or CNS, disorder arising from reductions in the enzyme AADC that results from mutations in the dopa decarboxylase gene. In July 2022, the EC approved Upstaza for the treatment of AADC deficiency for patients 18 months and older within the EEA. In November 2022, the Medicines and Healthcare Products Regulatory Agency approved Upstaza for the treatment of AADC deficiency for patients 18 months and older within the United Kingdom. In November 2024, the FDA granted accelerated approval of our gene therapy for the treatment of children and adults with AADC deficiency, which is marketed with the brand name Kebilidi in the United States.

Previous wording

We hold the rights for the commercialization of Tegsedi and Waylivra for the treatment of rare diseases in countries in Latin America and the Caribbean pursuant to a Collaboration and License Agreement, or the Tegsedi-Waylivra Agreement, dated August 1, 2018, by and between us and Akcea Therapeutics, Inc., or Akcea, a subsidiary of Ionis Pharmaceuticals, Inc. Tegsedi has received marketing authorization in the United States, European Union, or EU, and Brazil for the treatment of stage 1 or stage 2 polyneuropathy in adult patients with hereditary transthyretin amyloidosis, or hATTR amyloidosis. In August 2021, ANVISA, the Brazilian health regulatory authority, approved Waylivra as the first treatment for familial chylomicronemia syndrome, or FCS, in Brazil. In December 2022, ANVISA approved Waylivra for the treatment of familial partial lipodystrophy, or FPL. Waylivra has also received marketing authorization in the EU for the treatment of FCS.

Current wording

dated August 1, 2018, by and between us and Akcea Therapeutics, Inc., or Akcea, a subsidiary of Ionis Pharmaceuticals, Inc. Tegsedi has received marketing authorization in the United States, European Union, or EU, and Brazil for the treatment of stage 1 or stage 2 polyneuropathy in adult patients with hereditary transthyretin amyloidosis, or hATTR amyloidosis. In August 2021, ANVISA, the Brazilian health regulatory authority, approved Waylivra as the first treatment for familial chylomicronemia syndrome, or FCS, in Brazil. In December 2022, ANVISA approved Waylivra for the treatment of familial partial lipodystrophy, or FPL. Waylivra has also received marketing authorization in the EU for the treatment of FCS.

Previous wording

One of our most advanced clinical stage molecules is sepiapterin. Sepiapterin is a precursor to intracellular tetrahydrobiopterin, which is a critical enzymatic cofactor involved in metabolism and synthesis of numerous metabolic products. In May 2023, we announced that the primary endpoint was achieved in our registration-directed Phase 3 trial for sepiapterin for phenylketonuria, or PKU. The primary endpoint of the study was the achievement of statistically-significant reduction in blood Phe level. The primary analysis population included those patients who have a greater than 30% reduction in blood Phe levels during the Part 1 run-in phase of the trial. Sepiapterin demonstrated Phe level reduction of approximately 63% in the overall primary analysis population and Phe level reduction of approximately 69% in the subset for classical PKU patients. Additionally, sepiapterin was well tolerated with no serious adverse events. Following the placebo-controlled study, patients were eligible to enroll in a long-term open-label study, which is still ongoing and will evaluate long-term safety, durability and Phe tolerance. In March 2024, we submitted a marketing authorization

Current wording

One of our most advanced clinical stage molecules is sepiapterin. Sepiapterin is our product candidate for the treatment of phenylketonuria, or PKU. In May 2023, we announced that the primary endpoint was achieved in our registration-directed Phase 3 trial for sepiapterin for phenylketonuria, or PKU. The primary endpoint of the study was the achievement of statistically-significant reduction in blood Phe level. The primary analysis population included those patients who have a greater than 30% reduction in blood Phe levels during the Part 1 run-in phase of the trial. Sepiapterin demonstrated Phe level reduction of approximately 63% in the overall primary analysis population and Phe level reduction of approximately 69% in the subset for classical PKU patients. Additionally, sepiapterin was well tolerated with no serious adverse events. Following the placebo-controlled study, patients were eligible to enroll in a long-term open-label study, which is still ongoing and will evaluate long-term safety, durability and Phe tolerance. In March 2024, we submitted a marketing authorization application, or MAA, to the EMA for sepiapterin for the treatment of PKU in the EEA. In April 2025, the CHMP issued a positive opinion on the MAA for Sephience™ (sepiapterin) for the treatment of children and adults living with PKU. The opinion includes a broad label inclusive of all ages and disease severities. We expect the EC to ratify the marketing authorization for Sephience in approximately two months. In July 2024, we submitted an NDA to the FDA for sepiapterin for the treatment of pediatric and adult patients with PKU, including the full spectrum of ages and disease subtypes, in the United States. In September 2024, the FDA accepted for filing the NDA, with a target regulatory action date of July 29, 2025. We also made regulatory submissions for sepiapterin for the treatment of PKU in Brazil in the third quarter of 2024, and in Japan in the fourth quarter of 2024, with a regulatory decision in Japan expected in the fourth quarter of 2025.

Previous wording

In addition to our SMA program, our splicing platform also includes PTC518, which is being developed for the treatment of Huntington’s disease, or HD. We announced the results from our Phase 1 study of PTC518 in healthy volunteers in September 2021 demonstrating dose-dependent lowering of huntingtin messenger ribonucleic acid and protein levels, that PTC518 efficiently crosses blood brain barrier at significant levels and that PTC518 was well tolerated. We initiated a Phase 2 study of PTC518 for the treatment of HD in the first quarter of 2022, which consists of an initial 12-week placebo-controlled phase focused on safety, pharmacology and pharmacodynamic effects followed by a nine-month placebo-controlled phase focused on PTC518 biomarker effect. In June 2023, we announced interim data from the 12-week placebo-controlled phase. The study demonstrated dose-dependent lowering of Huntingtin, or HTT, protein levels in peripheral blood cells, reaching an approximate mean 30% reduction in mutant HTT levels at the 10mg dose level. In addition, PTC518 exposure in the cerebrospinal fluid was consistent with or higher than plasma unbound drug levels. Furthermore, PTC518 was well tolerated with no treatment-related serious adverse events. In June 2024, we announced additional interim results from the Phase 2 study of PTC518. At month 12, PTC518 treatment demonstrated durable dose-dependent lowering of mutant HTT, or mHTT, protein in the blood and dose-dependent lowering of mHTT protein in the cerebrospinal fluid in the interim cohort of stage 2 patients. In addition, favorable trends were demonstrated on several relevant HD clinical assessments. Furthermore, following 12 months of treatment, PTC518 continued to be well tolerated. Based on its review of the interim Phase 2 study data, the FDA lifted the partial clinical hold on the program. In September 2024, the FDA granted Fast Track designation to the PTC518 program for the treatment of HD.

Current wording

In addition to our SMA program, our splicing platform also includes PTC518, which is being developed for the treatment of Huntington’s disease, or HD. We announced the results from our Phase 1 study of PTC518 in healthy volunteers in September 2021 demonstrating dose-dependent lowering of huntingtin messenger ribonucleic acid and protein levels, that PTC518 efficiently crosses blood brain barrier at significant levels and that PTC518 was well tolerated. We initiated a Phase 2 study of PTC518 for the treatment of HD in the first quarter of 2022, which consists of an initial 12-week placebo-controlled phase focused on safety, pharmacology and pharmacodynamic effects followed by a nine-month placebo-controlled phase focused on PTC518 biomarker effect. In June 2024, we announced interim results from the full Phase 2 study of PTC518. At month 12, PTC518 treatment demonstrated durable dose-dependent lowering of mHTT protein in the blood and dose-dependent lowering of mHTT protein in the cerebrospinal fluid in the interim cohort of stage 2 patients. In addition, favorable trends were demonstrated on several relevant HD clinical assessments. Furthermore, following 12

Previous wording

Ourferroptosis and inflammation platform consists of small molecule compounds that target oxidoreductase enzymes that regulate oxidative stress and inflammatory pathways central to the pathology of a number of CNS diseases. The two most advanced molecules in our ferroptosis and inflammation platform are vatiquinone and utreloxastat. We announced topline results from a registration-directed Phase 3 trial of vatiquinone in children and young adults with Friedreich ataxia, or FA, called MOVE-FA, in May 2023. While the study did not meet its primary endpoint of statistically significant change in modified Friedreich Ataxia Rating Scale, or mFARS, score at 72 weeks in the primary analysis population, vatiquinone treatment did demonstrate significant benefit on key disease subscales and secondary endpoints. In addition, in the population of subjects that completed the study protocol, significance was reached in the mFARS endpoint and several secondary endpoints, including the upright stability subscale. Furthermore, vatiquinone was well tolerated. In the first quarter of 2024, we met with the FDA, who expressed willingness to review an NDA for vatiquinone for the treatment of Friedreich ataxia based on the MOVE-FA trial as well as data from the ongoing open label extension study following the MOVE-FA trial. In October 2024, we announced that the pre-specified endpoint for two different FA long-term extension studies was met, with statistically significant evidence of durable treatment benefit on disease progression. We plan to submit an NDA for vatiquinone for the treatment of FA in the United States in December 2024. In the third quarter of 2021, we completed a Phase 1 trial in healthy volunteers to evaluate the safety and pharmacology of utreloxastat. Utreloxastat was found to be well-tolerated with no reported serious adverse events while demonstrating predictable

Current wording

Our inflammation and ferroptosis platform consists of small molecule compounds that target oxidoreductase enzymes that regulate oxidative stress and inflammatory pathways central to the pathology of a number of CNS diseases. The most advanced molecule in our inflammation and ferroptosis platform is vatiquinone. We announced topline results from a registration-directed Phase 3 trial of vatiquinone in children and young adults with FA, called MOVE-FA, in May 2023. While the study did not meet its primary endpoint of statistically significant change in modified Friedreich Ataxia Rating Scale, or mFARS, score at 72 weeks in the primary analysis population, vatiquinone treatment did demonstrate significant benefit on key disease subscales and secondary endpoints. In addition, in the population of subjects that completed the study protocol, significance was reached in the mFARS endpoint and several secondary endpoints, including the upright stability subscale. Furthermore, vatiquinone was well tolerated. In October 2024, we announced that the pre-specified endpoint for two different FA long-term extension studies was met, with statistically significant evidence of durable treatment benefit on disease progression. In December 2024, we submitted an NDA to the FDA for vatiquinone for the treatment of children and adults living with FA. In February 2025, the FDA accepted for filing the NDA and granted priority review with a target regulatory action date of August 19, 2025.

Previous wording

In addition, we have a pipeline of product candidates and discovery programs that are in early clinical, pre-clinical and research and development stages focused on the development of new treatments for multiple therapeutic areas, including rare diseases.

Current wording

In addition, we have a pipeline of product candidates and discovery programs that are in early clinical, pre-clinical and research and development stages focused on the development of new treatments for multiple therapeutic areas for rare diseases.

Previous wording

The success of our products and any other product candidates we may develop, depends largely on obtaining and maintaining reimbursement from governments and third-party insurers. Our revenues are primarily generated from sales of Translarna for the treatment of nmDMD in countries where we were able to obtain acceptable commercial pricing and reimbursement terms and in select countries where we are permitted to distribute Translarna under our EAP programs or through similar styled programs, and from sales of Emflaza for the treatment of DMD in the United States. We also generate revenue from sales of Upstaza for the treatment of AADC deficiency in the EEA and have recognized revenue associated with milestone and royalty payments from Roche pursuant to a License and Collaboration Agreement, or the SMA License Agreement, by and among us, Roche and, for the limited purposes set forth therein, the SMA Foundation, under our SMA program.

Current wording

The success of our products and any other product candidates we may develop depends largely on obtaining and maintaining reimbursement from governments and third-party insurers. Our revenues are primarily generated from sales of Translarna for the treatment of nmDMD in countries where we were able to obtain acceptable commercial pricing and reimbursement terms and in select countries where we are permitted to distribute Translarna under our early access programs, or EAP, programs or through similar styled programs, and from sales of Emflaza for the treatment of DMD in the United States. We also generate revenue from sales of Upstaza for the treatment of AADC deficiency in the EEA, we have recognized revenue associated with milestone and royalty payments from Roche pursuant to a License and Collaboration Agreement, or the SMA License Agreement, by and among us, Roche and, for the limited purposes set forth therein, the SMA Foundation, under our SMA program and we have recognized license revenues related to performance obligations already completed pursuant to the Novartis Agreement.

Previous wording

To date, we have financed our operations primarily through the private offerings of convertible senior notes, public and “at the market” offerings of common stock, proceeds from royalty purchase agreements, net proceeds from our borrowings under our credit agreement with Blackstone, private placements of our convertible preferred stock and common stock, collaborations, bank and institutional lender debt, other convertible debt, grant funding and clinical trial support from governmental and philanthropic organizations and patient advocacy groups in the disease area addressed by our product candidates.. We have relied on revenue generated from net sales of Translarna for the treatment of nmDMD in territories outside of the United States since 2014, Emflaza for the treatment of DMD in the United States since 2017 and Upstaza for the treatment of AADC deficiency in the EEA since 2022. We have also relied on revenue associated with milestone and royalty payments from Roche pursuant to the SMA License Agreement, under our SMA program.

Current wording

We have financed our operations to date primarily through the private offerings of convertible senior notes, public and “at the market offerings” of common stock, proceeds from royalty purchase agreements, private placements of our convertible preferred stock and common stock, collaborations, bank and institutional lender debt, other convertible debt, grant funding and clinical trial support from governmental and philanthropic organizations and patient advocacy groups in the disease area addressed by our product candidates. We have relied on revenue generated from net sales of Translarna for the treatment of nmDMD in territories outside of the United States since 2014, Emflaza for the treatment of DMD in the United States since 2017 and Upstaza for the treatment of AADC deficiency in the EEA since 2022. We have also relied on revenue associated with milestone and royalty payments from Roche pursuant to the SMA License Agreement under our SMA program, revenue generated from net sales of Tegsedi and Waylivra in Latin America and the Caribbean, and license revenues related to performance obligations already completed pursuant to the Novartis Agreement.

Previous wording

In June 2024, we entered into an amendment with Royalty Pharma Investments 2019 ICAV, or Royalty Pharma, and Royalty Pharma plc, to the Amended and Restated Royalty Purchase Agreement, dated October 18, 2023, or the A&R Royalty Purchase Agreement, which amends and restates in its entirety the Royalty Purchase Agreement, dated as of July 17, 2020, or the Original Royalty Purchase Agreement. Pursuant to the A&R Royalty Purchase Agreement, we have sold to Royalty Pharma a portion of our right to receive sales-based royalty payments, or the Royalty, on worldwide net sales of Evrysdi and any other product developed pursuant to the SMA License Agreement under the SMA program. To date, Royalty Pharma has paid to us cash consideration of $1.9 billion (less Royalty payments received by us with respect to assigned Royalties, or the Assigned Royalty Rights) in exchange for 90.49% of the Royalty, which will be reduced to 83.33% after Royalty Pharma receives $1.3 billion in aggregate payments, or the Assigned Royalty Cap, from the Royalty assigned under the Original Royalty Purchase Agreement. We currently retain 9.51% of the Royalty, which increases to 16.67% after the Assigned Royalty Cap has been met. We have the option to sell our retained portions of the Royalty to Royalty Pharma in up to three tranches for the following payments: (1) $100.0 million in exchange for 3.81% of the Royalty, which increases to 6.67% after the Assigned Royalty Cap has been met, (2) $100.0 million in exchange for 3.81% of the Royalty, which increases to 6.67% after the Assigned Royalty Cap has been met, and (3) $50.0 million in exchange for 1.90% of the Royalty, which increases to 3.33% after the Assigned Royalty Cap has been met, in each case less Royalty payments received by us with respect to the Assigned Royalty Rights. See “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and capital resources—Sources of Liquidity” for additional information.

Current wording

In June 2024, we entered into an amendment with Royalty Pharma Investments 2019 ICAV, or Royalty Pharma, and Royalty Pharma plc, to the Amended and Restated Royalty Purchase Agreement, dated October 18, 2023, or the A&R Royalty Purchase Agreement, which amends and restated in its entirety the Royalty Purchase Agreement by and among us, RPI Intermediate Finance Trust, and for the limited purposes set forth in the agreement, Royalty Pharma plc, dated as of July 17, 2020, or the Original Royalty Purchase Agreement, and we exercised our first put option in exchange for $241.8 million in cash consideration. To date, Royalty Pharma has paid to us cash consideration of $1.9 billion (less payments on our right to receive sales-based royalty payments, or the Royalty, on worldwide net sales of Evrysdi and any other product in development pursuant to the SMA License Agreement received by us with respect to assigned Royalties, or the Assigned Royalty Rights) in exchange for 90.49% of the Royalty, which will be reduced to 83.33% after Royalty Pharma receives $1.3 billion in aggregate payments, or the Assigned Royalty Cap, from the Royalty assigned under the Original Royalty Purchase Agreement. We currently retain 9.51% of the Royalty, which increases to 16.67% after the Assigned Royalty Cap has been met. We have the option to sell our retained portions of the Royalty to Royalty Pharma in up to three tranches for the following payments: (1) $100.0 million in exchange for 3.81% of the Royalty, which increases to 6.67% after the Assigned Royalty Cap has been met, (2) $100.0 million in exchange for 3.81% of the Royalty, which increases to 6.67% after the Assigned Royalty Cap has been met, and (3) $50.0 million in exchange for 1.90% of the Royalty, which increases to 3.33% after the Assigned Royalty Cap has been met, in each case less Royalty payments received by us with respect to the Assigned Royalty Rights.

Previous wording

In August 2019, we entered into an At the Market Offering Sales Agreement, or the Sales Agreement, with Cantor Fitzgerald and RBC Capital Markets, LLC, or together, the Sales Agents, pursuant to which, we may offer and sell shares of our common stock, having an aggregate offering price of up to $125.0 million from time to time through the Sales Agents by any method that is deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended, or the Securities Act. During the three and nine months ended September 30, 2024, we did not issue or sell any shares of common stock pursuant to the Sales Agreement. The remaining shares of our common stock available to be issued and sold, under the Sales Agreement, have an aggregate offering price of up to $93.0 million as of September 30, 2024.

Current wording

In August 2019, we entered into an At the Market Offering Sales Agreement, or the Sales Agreement, with Cantor Fitzgerald and RBC Capital Markets, LLC, or together, the Sales Agents, pursuant to which, we may offer and sell shares of our common stock, having an aggregate offering price of up to $125.0 million from time to time through the Sales Agents by any method that is deemed to be an “at the market offering” as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended, or the Securities Act. During the three months ended March 31, 2025, we did not issue or sell any shares of common stock pursuant to the Sales Agreement. The remaining shares of our common stock available to be issued and sold, under the Sales Agreement, have an aggregate offering price of up to $93.0 million as of March 31, 2025.

Previous wording

As of September 30, 2024, we had an accumulated deficit of $3,581.0 million. We had a net loss of $297.4 million and $470.8 million for the nine months ended September 30, 2024 and 2023, respectively.

Current wording

As of March 31, 2025, we had an accumulated deficit of $2,780.3 million. We had a net income of $866.6 million and a net loss of $91.6 million for the three months ended March 31, 2025 and 2024, respectively.

Previous wording

Weanticipate that we will continue to incur significant expenses in connection with our commercialization efforts in the United States, the EEA, Latin America and other territories, including expenses related to our commercial infrastructure and corresponding sales and marketing, legal and regulatory, and distribution and manufacturing undertakings as well as administrative and employee-based expenses. In addition to the foregoing, we expect to continue to incur significant costs in connection with ongoing, planned and potential future clinical trials and studies for sepiapterin and our splicing and ferroptosis and inflammation programs as well as studies in our products for maintaining authorizations, label extensions and additional indications. We continue to seek marketing authorization for Translarna for the treatment of nmDMD in territories that we do not currently have marketing authorization in. Additionally, the CHMP maintained its negative opinion for Translarna for the treatment of nmDMD following the request for re-examination procedure. In accordance with EMA regulations, the opinion will be reviewed by the EC which is expected to decide on opinion adoption approximately 67 days from the date of issuance. We are also exploring other potential mechanisms by which we may provide Translarna to nmDMD patients in the EEA if the negative opinion is adopted by the EC. In March 2024, we submitted a BLA to the FDA for our gene therapy for the treatment of AADC deficiency in the United States. In May 2024, the FDA accepted the filing for the BLA and granted priority review with a target regulatory action date of November 13, 2024. In March 2024, we submitted an MAA, to the EMA for sepiapterin for the treatment of PKU in the EEA. In July 2024, we submitted an NDA to the FDA for sepiapterin for the treatment of PKU in the United States. In September 2024, the FDA accepted for filing the NDA, with a target regulatory action date of July 29, 2025. These efforts may significantly impact the timing and extent of our commercialization and manufacturing expenses.

Current wording

administrative and employee-based expenses. In addition to the foregoing, we expect to continue to incur significant costs in connection with ongoing, planned and potential future clinical trials and studies for our splicing and inflammation and ferroptosis programs as well as studies in our products for maintaining authorizations, label extensions and additional indications. We continue to seek marketing authorization for Translarna for the treatment of nmDMD in territories in which we do not currently have marketing authorization. We have submitted an MAA to the EMA for sepiapterin for the treatment of PKU in the EEA in March 2024, an NDA to the FDA for sepiapterin for the treatment of PKU in the United States in July 2024, and an NDA to the FDA for vatiquinione for the treatment of FA in the fourth quarter of 2024. These efforts may significantly impact the timing and extent of our commercialization and manufacturing expenses.

Previous wording

In July 2024, we announced the submission of an NDA to the FDA for sepiapterin for the treatment of PKU in the United States. Pursuant to the Agreement and Plan of Merger, dated May 5, 2020, or the Censa Merger Agreement, by and among us, Hydro Merger Sub, Inc., our wholly owned, indirect subsidiary, Censa Pharmaceuticals, Inc., or Censa, and, solely in its capacity as the representative, agent and attorney in fact of the securityholders of Censa, Shareholder Representative Services, LLC, the decision to submit the NDA triggered a $25.0 million regulatory milestone to the former Censa securityholders. In September 2024, we announced the FDA acceptance for filing of the NDA. Pursuant to the Censa Merger Agreement, the acceptance triggered a $25.0 million regulatory milestone to the former Censa securityholders. Together, the $50.0 million of regulatory milestones were recorded in research and development expense for the three and nine months ended September 30, 2024 and are recorded in accounts payable and accrued expenses on the consolidated balance sheet as of September 30, 2024.

Current wording

We expect to make payments to the former Censa Pharmaceuticals, Inc., or Censa, securityholders of $57.5 million in the aggregate in cash upon the potential achievement in 2025 of certain regulatory milestones relating to sepiapterin pursuant to the Agreement and Plan of Merger, dated as of May 5, 2020, or the Censa Merger Agreement, by and among us, Hydro Merger Sub, Inc., our wholly owned, indirect subsidiary, Censa and, solely in its capacity as the representative, agent and attorney-in-fact of the securityholders of Censa, Shareholder Representative Services LLC.

Previous wording

We have never been profitable and we will need to generate significant revenues to achieve and sustain profitability, and we may never do so. Accordingly, we may need to obtain substantial additional funding in connection with our continuing operations. Adequate additional financing may not be available to us on acceptable terms, or at all. If we are unable to raise capital when needed or on attractive terms, we could be forced to delay, reduce or eliminate our research and development programs or our commercialization efforts.

Current wording

We will need to generate significant revenues to achieve and sustain profitability, and we may never do so. Accordingly, we may need to obtain substantial additional funding in connection with our continuing operations. Adequate additional financing may not be available to us on acceptable terms, or at all. If we are unable to raise capital when needed or on attractive terms, we could be forced to delay, reduce or eliminate our research and development programs or our commercialization efforts.

Previous wording

*Net product revenues.*To date, our net product revenues have consisted primarily of sales of Translarna for the treatment of nmDMD in territories outside of the United States and sales of Emflaza for the treatment of DMD in the United States. We recognize revenue when performance obligations with customers have been satisfied. Our performance obligations are to provide products based on customer orders from distributors, hospitals, specialty pharmacies or retail pharmacies. The performance obligations are satisfied at a point in time when our customer obtains control of the product, which is typically upon delivery. We invoice customers after the products have been delivered and invoice payments are generally due within 30 to 90 days of invoice date. We determine the transaction price based on fixed consideration in its contractual agreements. Contract liabilities arise in certain circumstances when consideration is due for goods not yet provided. As we have identified only one distinct performance obligation, the transaction price is allocated entirely to the product sale. In determining the transaction price, a significant financing component does not exist since the timing from when we deliver product to when the customers pay for the product is typically less than one year. Customers in certain countries pay in advance of product delivery. In those instances, payment and delivery typically occur in the same month.

Current wording

*Net product revenues.*To date, our net product revenues have consisted primarily of sales of Translarna for the treatment of nmDMD in territories outside of the United States and sales of Emflaza for the treatment of DMD in the United States. We recognize revenue when performance obligations with customers have been satisfied and if it is probable that a significant revenue reversal will not occur. Our performance obligations are to provide products based on customer orders from distributors, hospitals, specialty pharmacies or retail pharmacies. The performance obligations are satisfied at a point in time when our customer obtains control of the product, which is typically upon delivery. We invoice customers after the products have been delivered and invoice payments are generally due within 30 to 90 days of invoice date. We determine the transaction price based on fixed consideration in its contractual agreements. Contract liabilities arise in

Previous wording

During the three months ended September 30, 2024 and 2023, net product sales outside of the United States were $83.5 million and $76.6 million, respectively, consisting of sales of Translarna, Tegsedi, Waylivra, and Upstaza. Translarna net revenues made up $72.3 million and $69.0 million of the net product sales outside of the United States for the three months ended September 30, 2024 and 2023, respectively. During the three months ended September 30, 2024 and 2023, net product sales in the United States were $51.9 million and $67.4 million, respectively, consisting solely of sales of Emflaza. During the three months ended September 30, 2024, two countries, the United States and Brazil, accounted for at least 10% of the Company’s net product sales, representing $51.9 million and $29.2 million of the net product sales, respectively. During the three months ended September 30, 2023, one country, the United States, accounted for at least 10% of the Company’s net product sales, representing $67.4 million of the net product sales, respectively. For the three months ended September 30, 2024 and 2023, the Company had two and three distributors, respectively, accounted for over 10% of the Company’s net product sales.

Current wording

During the three months ended March 31, 2025 and 2024, net product sales outside of the United States were $105.6 million and $120.1 million, respectively, consisting of sales of Translarna, Tegsedi, Waylivra, and Upstaza. Translarna net revenues made up $86.2 million and $103.6 million of the net product sales outside of the United States for the three months ended March 31, 2025 and 2024, respectively. During the three months ended March 31, 2025 and 2024, net product sales in the United States were $47.8 million and $57.5 million, respectively, consisting solely of sales of Emflaza. During the three months ended March 31, 2025, two countries, the United States and Russia, accounted for at least 10% of the Company’s net product sales, representing $47.8 million and $38.5 million of the net product sales, respectively. During the three months ended March 31, 2024, two countries, the United States and Russia, accounted for at least 10% of the Company’s net product sales, representing $57.5 million and $52.6 million of the net product sales, respectively. For the three months ended March 31, 2025 and 2024, two of the Company’s distributors each accounted for over 10% of the Company’s net product sales.

Previous wording

*Roche and the SMA Foundation Collaboration.*In November 2011, we entered into the SMA License Agreement pursuant to which we are collaborating with Roche and the SMA Foundation to further develop and commercialize compounds identified under our SMA program with the SMA Foundation. The research component of this agreement terminated effective December 31, 2014. We are eligible to receive additional payments from Roche if specified events are achieved with respect to each licensed product, including up to $135.0 million in research and development event milestones, up to $325.0 million in sales milestones upon achievement of specified sales events, and up to double digit royalties on worldwide annual net sales of a commercial product. As of September 30, 2024, we had recognized a total of $310.0 million in milestone payments and $487.5 million royalties on net sales pursuant to the SMA License Agreement. As of September 30, 2024, there are no remaining research and development event milestones that we can receive. The remaining potential sales milestones as of September 30, 2024 are $150.0 million upon achievement of certain sales events.

Current wording

*Roche and the SMA Foundation Collaboration.*In November 2011, we entered into the SMA License Agreement pursuant to which we are collaborating with Roche and the SMA Foundation to further develop and commercialize compounds identified under our SMA program with the SMA Foundation. The research component of this agreement terminated effective December 31, 2014. We are eligible to receive additional payments from Roche if specified events are achieved with respect to each licensed product, including up to $135.0 million in research and development event milestones, up to $325.0 million in sales milestones upon achievement of specified sales events, and up to double digit royalties on worldwide annual net sales of a commercial product. As of March 31, 2025, we had recognized a total of $310.0 million in milestone payments and $582.0 million royalties on net sales pursuant to the SMA License Agreement. As of March 31, 2025, there are no remaining research and development event milestones that we can receive. The remaining potential sales milestones as of March 31, 2025 are $150.0 million upon achievement of certain sales events.

Previous wording

For the three and nine months ended September 30, 2024, we recognized $61.4 million and $145.7 million of royalty revenue, respectively, related to Evrysdi. For the three and nine months ended September 30, 2023, we recognized $50.2 million and $117.9 million of royalty revenue, respectively, related to Evrysdi.

Current wording

For the three months ended March 31, 2025 and 2024, we recognized $36.4 million and $31.2 million of royalty revenue, respectively, related to Evrysdi.

Previous wording

For the three and nine months ended September 30, 2024, the Company did not recognize collaboration revenue related to the SMA License Agreement with Roche. For the three and nine months ended September 30, 2023, the amounts recognized for the collaboration revenue related to the SMA License Agreement with Roche were immaterial.

Current wording

For the three months ended March 31, 2025, we recognized $989.8 million in collaboration revenues related to the Novartis Agreement. For the three months ended March 31, 2024, we did not recognize collaboration revenue related to the Novartis Agreement.

Previous wording

We expect our research and development expenses to fluctuate in connection with our ongoing activities, particularly in connection with Study 041 and other studies for Translarna for the treatment of nmDMD, our activities under our splicing and ferroptosis and inflammation programs and performance of our post-marketing requirements imposed by regulatory agencies with respect to our products. The timing and amount of these expenses will depend upon the outcome of our ongoing clinical trials and the costs associated with our planned clinical trials. The timing and amount of these expenses will also depend on the costs associated with potential future clinical trials of our products or product candidates and the related expansion of our research and development organization, regulatory requirements, advancement of our preclinical programs, and product and product candidate manufacturing costs.

Current wording

We expect our research and development expenses to fluctuate in connection with our ongoing activities, particularly in connection with our activities under our splicing and inflammation and ferroptosis programs and performance of our post-marketing requirements imposed by regulatory agencies with respect to our products. The timing and amount of these expenses will depend upon the outcome of our ongoing clinical trials and the costs associated with our planned clinical trials. The timing and amount of these expenses will also depend on the costs associated with potential future clinical trials of our products or product candidates and the related expansion of our research and development organization, regulatory requirements, advancement of our preclinical programs, and product and product candidate manufacturing costs.

Previous wording

The following tables provides research and development expense for our most advanced principal product development programs, for the three and nine months ended September 30, 2024 and 2023.

Current wording

The following tables provides research and development expense for our most advanced principal product development programs, for the three months ended March 31, 2025 and 2024.

Previous wording

For the three and nine months ended September 30, 2024, compared to the three and nine months ended September 30, 2023, the decrease in development expenses primarily reflected the decrease in program spend related to our strategic pipeline prioritization as we continue to focus our resources on our differentiated, high potential research and development programs.

Current wording

For the three months ended March 31, 2025, compared to the three months ended March 31, 2024, the decrease in development expenses primarily reflected the decrease in program spend related to our continued focus of our resources on our differentiated, high potential research and development programs.

Previous wording

For the three and nine months ended September 30, 2024, compared to the three and nine months ended September 30, 2023, the decrease in research expenses was primarily related to our strategic pipeline prioritization where we discontinued several preclinical and early research programs. In 2024, we continue to focus our resources on our differentiated, high potential research and development programs.

Current wording

For the three months ended March 31, 2025, compared to the three months ended March 31, 2024, the change in research expenses was relatively flat. We continue to focus our resources on our differentiated, high potential research and development programs.

Previous wording

Payroll, benefits, and share-based stock compensation. Consists of costs incurred for salaries and wages, bonus, payroll taxes, benefits and stock-based compensation associated with employees involved in research and development activities. Stock-based compensation may fluctuate from period to period based on factors that are not within our control, such as our stock price on the dates stock-based grants are issued.

Current wording

Payroll, benefits, and share-based stock compensation. Consists of costs incurred for salaries and wages, bonus, payroll taxes, benefits and share-based stock compensation associated with employees involved in research and development activities. Share-based stock compensation may fluctuate from period to period based on factors that are not within our control, such as our stock price on the dates share-based grants are issued.

Previous wording

For the three and nine months ended September 30, 2024 compared to the three and nine months ended September 30, 2023, the decrease in payroll, benefits, and share-based stock compensation expenses primarily relates to our reduction in workforce in connection with our strategic pipeline prioritization and discontinuation of our preclinical and early research programs in our gene therapy platform.

Current wording

For the three months ended March 31, 2025 compared to the three months ended March 31, 2024, the decrease in payroll, benefits, and share-based stock compensation expenses primarily related to a decrease in share-based stock compensation for the three months ended March 31, 2025 compared to three months ended March 31, 2024.

Previous wording

For the three and nine months ended September 30, 2024 compared to the three and nine months ended September 30, 2023, the decrease in facilities and other expenses primarily related to decreases in facility-based expenses at our facility in Hopewell Township, New Jersey as a result of an amendment and restatement of our lease for such facility.

Current wording

For the three months ended March 31, 2025 compared to the three months ended March 31, 2024, the decrease in facilities and other expenses primarily related to decreases in facility-based expenses at our facility in Hopewell Township, New Jersey as a result of an amendment and restatement of our lease for such facility in June 2024 and at our facility in Warren, New Jersey as a result of an amendment to our lease for such facility in December 2024.

Previous wording

Interest expense, net consists of interest expense from the liability for the sale of future royalties related to the Original Royalty Purchase Agreement, the A&R Royalty Purchase Agreement, the 2026 Convertible Notes outstanding, the Blackstone Credit Agreement that we repaid and terminated in October 2023, offset by interest income earned on investments.

Current wording

Interest expense, net consists of interest expense from the liability for the sale of future royalties related to the A&R Royalty Purchase Agreement and the 2026 Convertible Notes outstanding, offset by interest income earned on investments.

Previous wording

During the three and nine months ended September 30, 2024, there were no material changes to our critical accounting policies as reported in our 2023 Annual Report.

Current wording

During the three months ended March 31, 2025, there were no material changes to our critical accounting policies as reported in our 2024 Annual Report.

Previous wording

*Net product revenues.*Net product revenues were $446.2 million for the nine months ended September 30, 2024, a decrease of $59.9 million, or 12%, from $506.2 million for the nine months ended September 30, 2023. The decrease in net product revenue was primarily due to a decrease in net product sales of Translarna and Emflaza. Translarna net product revenues were $246.2 million for the nine months ended September 30, 2024, a decrease of $34.4 million, or 12%, compared to $280.6 million for the nine months ended September 30, 2023. These results were due to the timing of bulk patient orders. Emflaza net product revenues were $156.7 million for the nine months ended September 30, 2024, a decrease of $31.0 million, or 17%, compared to $187.7 million for the nine months ended September 30, 2023. These results were driven by the expiration of Emflaza’s orphan drug exclusivity in February 2024.

Current wording

Net product revenue. Net product revenue was $153.4 million for the three months ended March 31, 2025, a decrease of $24.2 million, or 14%, from $177.6 million for the three months ended March 31, 2024. The decrease in net product revenue was primarily due to a decrease in net product sales of Emflaza and Translarna. Emflaza net product revenue was $47.8 million for the three months ended March 31, 2025, a decrease of $9.7 million, or 17%, compared to $57.5 million for the three months ended March 31, 2024. These results were driven by the expiration of Emflaza’s orphan drug exclusivity in February 2024. Translarna net product revenues were $86.2 million for the three months ended March 31, 2025, a decrease of $17.4 million, or 17%, compared to $103.6 million for the three months ended March 31, 2024. These results were due to the timing of bulk patient orders.

Previous wording

*Royalty revenue.*Royalty revenue was $61.4 million for the three months ended September 30, 2024, an increase of $11.2 million, or 22%, from $50.2 million for the three months ended September 30, 2023. The increase in royalty revenue was due to higher Evrysdi sales in the three months ended September 30, 2024 as compared to the three months ended September 30, 2023. In accordance with the SMA License Agreement, we are entitled to royalties on worldwide annual net sales of the product.

Current wording

*Royalty revenue.*Royalty revenue was $36.4 million for the three months ended March 31, 2025, an increase of $5.3 million, or 17%, from $31.2 million for the three months ended March 31, 2024. The increase in royalty revenue was due to higher Evrysdi sales in the three months ended March 31, 2025 as compared to the three months ended March 31, 2024. In accordance with the SMA License Agreement, we are entitled to royalties on worldwide annual net sales of the product.

Previous wording

Manufacturing revenue. Manufacturing revenues were $0.0 million for the three months ended September 30, 2024, a decrease of $2.4 million, or 100%, from $2.4 million for the three months ended September 30, 2023. The decrease was due to no manufacturing services related to the production of plasmid DNA and AAV vectors for gene therapy applications for external customers being performed in the three months ended September 30, 2024 as compared to the three months ended September 30, 2023. In June 2024, we sold our gene therapy manufacturing business in Hopewell Township, New Jersey. Accordingly, we do not expect to have manufacturing revenue going forward.

Current wording

Manufacturing revenue. Manufacturing revenue was $0.0 million for the three months ended March 31, 2025, a decrease of $1.4 million, or 100%, from $1.4 million for the three months ended March 31, 2024. The decrease was due to the prior completion of all manufacturing services related to the production of plasmid DNA and AAV vectors for gene therapy applications for external customers. In June 2024, we sold our gene therapy manufacturing business in Hopewell Township, New Jersey. Accordingly, we do not expect to have manufacturing revenue going forward.

Previous wording

Cost of product sales, excluding amortization of acquired intangible assets. Cost of product sales, excluding amortization of acquired intangible assets were $10.8 million for the three months ended September 30, 2024, an increase of $1.4 million, or 14%, from $9.5 million for the three months ended September 30, 2023. Cost of product sales consisted primarily of royalty payments associated with Emflaza, Translarna, and Upstaza net product sales, costs associated with Emflaza, Translarna, and Upstaza products sold during the period, and royalty expense related to royalty revenues and collaboration milestone revenues. The increase in cost of product sales, excluding amortization of acquired intangible asset, was primarily due to increases in royalty costs driven by Emflaza. As of February 2024, the Emflaza rights intangible

Current wording

Cost of product, collaboration and license sales, excluding amortization of acquired intangible assets. Cost of product, collaboration and license sales, excluding amortization of acquired intangible assets were $12.9 million for the three months ended March 31, 2025, a decrease of $1.9 million, or 13%, from $14.7 million for the three months ended March 31, 2024. Cost of product, collaboration and license sales, excluding amortization of acquired intangible assets consisted primarily of royalty payments associated with Emflaza, Translarna, and Upstaza net product sales, costs associated with Emflaza, Translarna, and Upstaza products sold during the period, and inventory reserves. The decrease in cost of product, collaboration and license sales, excluding amortization of acquired intangible assets, was primarily due to decreases in royalty costs driven by Emflaza as a result of the completion of the royalty agreement with Marathon Pharmaceuticals, LLC (now known as Complete Pharma Holdings, LLC), which was partially offset by Translarna inventory reserves.

Previous wording

Amortization of acquired intangible assets. Amortization of acquired intangible assets were $3.0 million for the three months ended September 30, 2024, a decrease of $55.6 million, or 95%, from $58.6 million for the three months ended September 30, 2023. These amounts are related to the Emflaza rights acquisition, as well as the Waylivra, Tegsedi, and Upstaza intangible assets, which are all being amortized on a straight-line basis over their estimated useful lives. The amortization decrease was driven by the Emflaza rights intangible asset being fully amortized as of February 2024, therefore, milestones are recorded on the consolidated statement of operations within cost of product sales, excluding amortization of acquired intangible assets from February 2024 onward.

Current wording

Amortization of acquired intangible assets. Amortization of acquired intangible assets were $3.8 million for the three months ended March 31, 2025, a decrease of $47.7 million, or 93%, from $51.5 million for the three months ended March 31, 2024. These amounts are related to the Emflaza rights acquisition, as well as the Waylivra, Tegsedi, and Upstaza/Kebilidi intangible assets, which are all being amortized on a straight-line basis over their estimated useful lives. The amortization decrease was driven by the Emflaza rights intangible asset being fully amortized as of February 2024. As a result, there is no further amortization for Emflaza as of February 2024.