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, 2021 included in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 22, 2022, or our 2021 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 2021 Annual Report, our actual results may differ materially from those anticipated in these forward-looking statements.

Our Company

We are a science-driven global biopharmaceutical company focused on the discovery, development and commercialization of clinically differentiated medicines that provide benefits to patients 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 few or 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 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.

Corporate Updates

COVID-19 Impact

The global pandemic caused by a strain of novel coronavirus, COVID-19, has impacted and is continuing to impact the timing of certain of our clinical trials and regulatory submissions as well as other aspects of our business operations. In addition to our previous disclosures regarding the impact of the COVID-19 pandemic, such as those set forth in our Annual Report on Form 10-K for the year ended December 31, 2021, the following expectations have been revised as a result of the impact or expected impact of the COVID-19 pandemic:

As of the date of this Report on Form 10-Q, except as otherwise previously

disclosed with respect to Translarna product revenue in Brazil, our ability to

generate revenue has not been significantly affected by the COVID-19 pandemic.

However, due to travel restrictions, social distancing and the continued global

? uncertainty resulting from the COVID-19 pandemic, we may have difficulty

identifying and accessing new patients, supporting existing patients and

meeting with regulatory authorities or other governmental entities, which may

negatively affect our future revenue. We continue to support our existing

patient base and remotely connect with them, as necessary. We have not

encountered any material issues in supplying those patients.

As previously disclosed, in response to the global uncertainty caused by the

? COVID-19 pandemic, we are continuing to prioritize our expenses where we deem

appropriate and strategically positioning our capital allocation.

The COVID-19 pandemic and responsive measures thereto may result in further negative impacts, including additional delays in our clinical and regulatory activities and further fluctuations in our revenue. We cannot be certain what the overall impact of the COVID-19 pandemic will be on our business and it has the potential to materially adversely affect our business, financial condition, results of operations, and prospects. For additional information, see "Item 1A. Risk



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Factors - We face risks related to health epidemics and other widespread outbreaks of contagious disease, which are, and may continue to, delay our ability to complete our ongoing clinical trials and initiate future clinical trials, disrupt regulatory activities and have other adverse effects on our business and operations, including the novel coronavirus (COVID-19) pandemic, which has disrupted, and may continue to disrupt, our operations and may significantly impact our operating results. In addition, the COVID-19 pandemic has caused substantial disruption in the financial markets and economies, which could result in adverse effects on our business and operations." in our Annual Report on Form 10-K for the year ended December 31, 2021.

Global Commercial Footprint

Global DMD Franchise

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 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 and in Russia for the treatment of nmDMD in patients aged two years and older. In July 2020, the European Commission approved the removal of the statement "efficacy has not been demonstrated in non-ambulatory patients" from the indication statement for Translarna. Translarna also has marketing authorization in Brazil for the treatment of nmDMD in ambulatory patients two years and older and for continued treatment of patients that become non-ambulatory. During the quarter ended March 31, 2022, we recognized $79.2 million in net sales from 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, 2022, we recognized $48.6 million in net sales from Emflaza.

Our marketing authorization for Translarna in the EEA is subject to annual review and renewal by the European Commission 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 June 2021, the European Commission renewed our marketing authorization, making it effective, unless extended, through August 5, 2022. In February 2022, we submitted a marketing authorization renewal request to the EMA and, in April 2022, the Committee for Medicinal Products for Human Use, or CHMP, issued an opinion recommending the renewal. This marketing authorization is further subject to a specific obligation to conduct and submit the results of an 18-month, placebo-controlled trial, followed by an 18-month open-label extension, which we refer to together as Study 041. We anticipate reporting results from the placebo-controlled trial by the end of the second quarter of 2022 after data analysis is completed. We then expect to submit a report on the placebo-controlled trial and the open-label extension data that has been collected to date to the EMA by the end of the third quarter of 2022, as required.

Each country, including each member state of the EEA, has its own pricing and reimbursement regulations. In order to commence commercial sale of product pursuant to our Translarna marketing authorization in any particular country in the EEA, we must finalize pricing and reimbursement negotiations with the applicable government body in such country. As a result, our commercial launch will continue to be on a country-by-country basis. We also have made, and expect to continue to make, product available under early access programs, or EAP programs, both in countries in the EEA and other territories. Our ability to negotiate, secure and maintain reimbursement for product under commercial and EAP programs can be subject to challenge in any particular country and can also be affected by political, economic and regulatory developments in such country.

There is substantial risk that if we are unable to renew our EEA marketing authorization during any annual renewal cycle, or if our product label is materially restricted, or if Study 041 does not provide the data necessary to maintain our marketing authorization, we would lose all, or a significant portion of, our ability to generate revenue from sales of Translarna in the EEA and other territories.

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



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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. We anticipate reporting results from the placebo-controlled trial of Study 041 by the end of the second quarter of 2022 after data analysis is completed, and subject to a positive outcome in that study, we expect to re-submit the NDA.

Tegsedi® (inotersen) and Waylivra™ (volanesorsen)

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. We began to make commercial sales of Tegsedi for the treatment of hATTR amyloidosis in Brazil in the second quarter of 2022 and we continue to make Tegsedi available in certain other countries within Latin America and the Caribbean through early access programs, or EAP Programs. In August 2021, ANVISA, the Brazilian health regulatory authority, approved Waylivra as the first treatment for familial chylomicronemia syndrome, or FCS, in Brazil and we have initiated our commercial launch in Brazil while continuing to make Waylivra available in certain other countries within Latin America and the Caribbean through EAP programs. Waylivra has also received marketing authorization in the European Union, or EU, for the treatment of FCS. Additionally, we submitted an application to ANVISA in December 2021 for the approval of Waylivra for the treatment of familial partial lipodystrophy, or FPL, and we expect a regulatory decision on approval in the second half of 2022.

Evrysdi

We also have an SMA collaboration with Roche and the SMA Foundation. The SMA program has one approved product, Evrysdi, which was approved by the FDA in August 2020 for the treatment of SMA in adults and children two months and older and by the European Commission in March 2021 for the treatment of 5q SMA in patients two months and older with a clinical diagnosis of SMA Type 1, Type 2 or Type 3 or with one to four SMN2 copies. Evrysdi also received marketing authorization for the treatment of SMA in Brazil in October 2020 and Japan in June 2021. In January 2022, the FDA granted priority review of a supplemental new drug application for Evrysdi to expand the indication to include pre-symptomatic infants under two months old with SMA and a regulatory decision on approval is expected in May 2022.

Diversified Development Pipeline

Splicing Platform

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. We expect results from the initial 12-week phase of the Phase 2 study by the end of 2022.

Gene Therapy Platform

We have a pipeline of gene therapy product candidates for rare monogenic diseases that affect the central nervous system, or CNS, including PTC-AADC for the treatment of Aromatic L-Amino Acid Decarboxylase, or AADC, deficiency, a rare



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CNS disorder arising from reductions in the enzyme AADC that result from mutations in the dopa decarboxylase gene. In January 2020, we submitted a marketing authorization application, or MAA, for PTC-AADC for the treatment of AADC deficiency in the EEA to the EMA. In April 2022, we completed the Scientific Advisory Group and Oral Explanation meetings for PTC-AADC with the EMA's Committee for Advanced Therapies. We expect an opinion from the CHMP in May 2022. We are also preparing a biologics license application, or BLA, for PTC-AADC for the treatment of AADC deficiency in the United States. In response to discussions with the FDA, we intend to provide additional information concerning the use of the commercial cannula for PTC-AADC in young patients. We expect to submit a BLA to the FDA in the third quarter of 2022.

Bio-e Platform

Our Bio-e 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 Bio-e platform are vatiquinone and PTC857. We initiated a registration-directed Phase 2/3 placebo-controlled trial of vatiquinone in children with mitochondrial disease associated seizures in the third quarter of 2020. We previously experienced delays in enrolling this trial due to the COVID-19 pandemic and anticipate results from this trial to be available in the fourth quarter of 2022. We also initiated a registration-directed Phase 3 trial of vatiquinone in children and young adults with Friedreich ataxia in the fourth quarter of 2020 and anticipate results from this trial to be available in the second quarter of 2023. In the third quarter of 2021, we completed a Phase 1 trial in healthy volunteers to evaluate the safety and pharmacology of PTC857. PTC857 was found to be well-tolerated with no reported serious adverse events while demonstrating predictable pharmacology. We initiated a Phase 2 trial of PTC857 for amyotrophic lateral sclerosis in the first quarter of 2022.

Metabolic Platform

The most advanced molecule in our metabolic platform is PTC923, an oral formulation of synthetic sepiapterin, a precursor to intracellular tetrahydrobiopterin, which is a critical enzymatic cofactor involved in metabolism and synthesis of numerous metabolic products, for orphan diseases. We initiated a registration-directed Phase 3 trial for PTC923 for phenylketonuria, or PKU, in the third quarter of 2021 and expect results from this trial to be available by the end of 2022.

Oncology Platform

We also two oncology agents in that are in clinical development, unesbulin and emvododstat. We completed our Phase 1 trials evaluating unesbulin in leiomyosarcoma, or LMS, and diffuse intrinsic pontine glioma, or DIPG, in the fourth quarter of 2021. We initiated a registration-directed Phase 2/3 trial of unesbulin for the treatment of LMS in the first quarter of 2022 and we expect to initiate a registration-directed Phase 2 trial of unesbulin for the treatment of DIPG in the third quarter of 2022. We completed our Phase 1 trial evaluating emvododstat in acute myelogenous leukemia, or AML, in the fourth quarter of 2021. We expect to provide further updates regarding our emvododstat program at a later date.

Emvododstat for COVID-19

In June 2020, we initiated a Phase 2/3 clinical trial evaluating the efficacy and safety of emvododstat in patients hospitalized with COVID-19. In February 2021, we announced the completion of the first stage of the Phase 2/3 trial. We expect results from this trial to be available in the second quarter of 2022.

Multi-Platform Discovery

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 and oncology.



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Funding

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 and from sales of Emflaza for the treatment of DMD in the United States. We have also 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.

To date, we have financed our operations primarily through our offering of 3.00% convertible senior notes due August 15, 2022, or the 2022 Convertible Notes, our offering of 1.50% convertible senior notes due September 15, 2026, or the 2026 Convertible Notes, and, together with the 2022 Convertible Notes, the Convertible Notes, our public offerings of common stock in February 2014, in October 2014, in April 2018, in January 2019, and in September 2019, the common stock issued in our "at the marketing offering", our initial public offering of common stock in June 2013, proceeds from a Royalty Purchase Agreement dated as of July 17, 2020, by and among us, RPI 2019 Intermediate Finance Trust, or RPI, and, solely for the limited purposes set forth therein, Royalty Pharma PLC, or the Royalty Purchase Agreement, private placements of our preferred stock, collaborations, bank and institutional lender debt and convertible debt financings, and grants and clinical trial support from governmental and philanthropic organizations and patient advocacy groups in the disease areas addressed by our product candidates. Since 2014, we have also relied on revenue generated from net sales of Translarna for the treatment of nmDMD in territories outside of the United States, and since May 2017, we have generated revenue from net sales of Emflaza for the treatment of DMD in the United States. We have also relied on revenue associated with milestone and royalty payments from Roche pursuant to the SMA License Agreement.

The 2022 Convertible Notes consist of $150.0 million in aggregate principal amount of 3.00% convertible senior notes due 2022. The 2022 Convertible Notes bear cash interest payable on February 15 and August 15 of each year, beginning on February 15, 2016. The 2022 Convertible Notes are senior unsecured obligations of ours and will mature on August 15, 2022, unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. As of February 15, 2022, until the close of business on the business day immediately preceding the maturity date, holders may convert their 2022 Convertible Notes at any time. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our common stock or any combination thereof at our election. We received net proceeds from the offering of approximately $145.4 million, after deducting the initial purchasers' discounts and commissions and the offering expenses payable by us.

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. 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 December 31, 2021. During the three months ended March 31, 2022, we did not issue or sell any shares of common stock pursuant to the Sales Agreement.

The 2026 Convertible Notes consist of $287.5 million aggregate principal amount of 1.50% convertible senior notes due 2026. The 2026 Convertible Notes bear cash interest at a rate of 1.50% per year, payable semi-annually on March 15 and September 15 of each year, beginning on March 15, 2020. The 2026 Convertible Notes will mature on September 15, 2026, unless earlier repurchased or converted. We received net proceeds of $279.3 million after deducting the initial purchasers' discounts and commissions and the offering expenses payable by us.

As of March 31, 2022, we had an accumulated deficit of $2,224.7 million. We had a net loss of $126.7 million and $128.6 million for the three month periods ended March 31, 2022 and 2021, respectively.

We anticipate that our expenses will continue to increase in connection with our commercialization efforts in the United States, the EEA, Latin America and other territories, including the expansion of our infrastructure and corresponding sales



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and marketing, legal and regulatory, distribution and manufacturing, including expanding our direct manufacturing capabilities at our leased biologics manufacturing facility and administrative and employee-based expenses. In addition to the foregoing, we expect to continue to incur ongoing research and development expenses for our products and product candidates, including our splicing, gene therapy, Bio-e, metabolic and oncology programs, our studies of emvododstat for COVID-19 as well as studies in our products for maintaining authorizations, including Study 041, label extensions and additional indications. In addition, we may incur substantial costs in connection with our efforts to advance our regulatory submissions. We continue to seek marketing authorization for Translarna for the treatment of nmDMD in territories that we do not currently have marketing authorization in and we may also seek marketing authorization for Translarna for other indications. We submitted an MAA to the EMA for the treatment of AADC deficiency with PTC-AADC in the EEA and we expect an opinion from the CHMP in May 2022. We are also preparing a BLA for PTC-AADC for the treatment of AADC deficiency in the United States and we anticipate submitting a BLA to the FDA in the third quarter of 2022. We filed for marketing authorization for Waylivra with ANVISA for the treatment of FPL and we expect a regulatory decision on approval from ANVISA in the second half of 2022. These efforts may significantly impact the timing and extent of our commercialization expenses.

We may seek to expand and diversify our product pipeline through opportunistically in-licensing or acquiring the rights to products, product candidates or technologies and we may incur expenses, including with respect to transaction costs, subsequent development costs or any upfront, milestone or other payments or other financial obligations associated with any such transaction, which would increase our future capital requirements.

With respect to our outstanding 2022 Convertible Notes, cash interest payments are payable on a semi-annual basis in arrears, which require total funding of $4.5 million annually. The 2022 Convertible Notes will mature on August 15, 2022 and we will be required to pay any outstanding principal amount of the 2022 Convertible Notes at that time, unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. As of February 15, 2022, until the close of business on the business day immediately preceding the maturity date, holders may convert their 2022 Convertible Notes at any time. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our common stock or any combination thereof at our election. With respect to our outstanding 2026 Convertible Notes, cash interest payments are payable on a semi-annual basis in arrears, which will require total funding of $4.3 million annually.

In addition, in the first quarter of 2022, we paid Marathon Pharmaceuticals, LLC (now known as Complete Pharma Holdings, LLC), or Marathon, a $50.0 million sales-based milestone in connection with Emflaza. We expect to pay the former equityholders of Agilis an aggregate of $70.0 million upon the achievement of certain development and regulatory milestones in 2022 relating to PTC-AADC. We also expect to pay the former securityholders of Censa Pharmaceuticals, Inc., or Censa, a $30.0 million development milestone for the completion of enrollment of a Phase 3 clinical trial for PTC923 for PKU in 2022. If achieved, we have the option to pay such milestone payment in cash or shares of our common stock.

We also have certain significant contractual obligations and commercial commitments that require funding and we have disclosed these items under the heading "Management's Discussion and Analysis of Financial Condition and Results of Operations-Funding Obligations" in our 2021 Annual Report on Form 10-K. There were no material changes to these obligations and commitments during the period ended March 31, 2022. Furthermore, since we are a public company, we have incurred and expect to continue to incur additional costs associated with operating as such including significant legal, accounting, investor relations and other expenses.

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.



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Financial operations overview

Revenues

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.

We record product sales net of any variable consideration, which includes discounts, allowances, rebates related to Medicaid and other government pricing programs, and distribution fees. We use the expected value or most likely amount method when estimating variable consideration, unless discount or rebate terms are specified within contracts. The identified variable consideration is recorded as a reduction of revenue at the time revenues from product sales are recognized. These estimates for variable consideration are adjusted to reflect known changes in factors and may impact such estimates in the quarter those changes are known. Revenue recognized does not include amounts of variable consideration that are constrained. For the three months ended March 31, 2022 and 2021, net product sales outside of the United States were $81.2 million and $47.8 million, respectively. For the three months ended March 31, 2022 and 2021, net product sales in the United States were $48.6 million and $43.5 million, respectively, consisting solely of Emflaza. Translarna net revenues made up $79.2 million and $46.5 million of the net product sales outside of the United States for the three months ended March 31, 2022 and 2021, respectively.

In relation to customer contracts, we incur costs to fulfill a contract but do not incur costs to obtain a contract. These costs to fulfill a contract do not meet the criteria for capitalization and are expensed as incurred. We consider any shipping and handling costs that are incurred after the customer has obtained control of the product as a cost to fulfill a promise. Shipping and handling costs associated with finished goods delivered to customers are recorded as a selling expense.

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, 2022, we had recognized a total of $160.0 million in milestone payments and $78.3 million royalties on net sales pursuant to the SMA License Agreement. As of March 31, 2022, there are no remaining research and development event milestones that we can receive. The remaining potential sales milestones as of March 31, 2022 are $300.0 million upon achievement of certain sales events.

For the three months ended March 31, 2022 and 2021, we recognized $0.0 million and $20.0 million of collaboration revenue, respectively, related to the SMA License Agreement with Roche. The first commercial sale of Evrysdi in the European Union was made in March 2021. This event triggered a $20.0 million milestone payment to us from Roche for the three months ended March 31, 2021.

For the three months ended March 31, 2022 and 2021, we have recognized $18.9 million and $6.7 million of royalty revenue, respectively, related to Evrysdi.



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Pursuant to the Royalty Purchase Agreement, we sold to RPI 42.933%, or the Assigned Royalty Payment, 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 in consideration for $650.0 million. We have retained a 57.067% interest in the Royalty and all economic rights to receive the remaining potential regulatory and sales milestone payments under the SMA License Agreement. The Royalty Purchase Agreement will terminate 60 days following the earlier of the date on which Roche is no longer obligated to make any payments of the Royalty pursuant to the SMA License Agreement and the date on which RPI has received $1.3 billion in respect of the Assigned Royalty Payment.

Research and development expense

Research and development expenses consist of the costs associated with our research activities, as well as the costs associated with our drug discovery efforts, conducting preclinical studies and clinical trials, manufacturing development efforts and activities related to regulatory filings. Our research and development expenses consist of:

?external research and development expenses incurred under agreements with third-party contract research organizations and investigative sites, third-party manufacturing organizations and consultants;

?employee-related expenses, which include salaries and benefits, including share-based compensation, for the personnel involved in our drug discovery and development activities; and

?facilities, depreciation and other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, IT, human resources and other support functions, depreciation of leasehold improvements and equipment, and laboratory and other supplies.

We use our employee and infrastructure resources across multiple research projects, including our drug development programs. We track expenses related to our clinical programs and certain preclinical programs on a per project basis.

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, gene therapy, Bio-e, metabolic and oncology programs and our studies of emvododstat for COVID-19 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.

The following tables provide research and development expense for our most advanced principal product development programs, for the three months ended March 31, 2022 and 2021. Certain prior period expenses have been reclassified to conform to the current period presentation.



                                     Three Months Ended March 31,
                                       2022                 2021

                                             (in thousands)
Global DMD Franchise              $        17,694      $        15,457
Metabolic                                  15,756               11,579
Gene Therapy                               42,570               54,633
Bio-e                                      14,864               13,601
Oncology                                    6,255                3,151
Splicing                                   14,397                9,624
Emvododstat for COVID-19                    2,348               10,874
Discovery                                  26,194               15,594

Total research and development $ 140,078 $ 134,513




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The successful development of our products and product candidates is highly uncertain. This is due to the numerous risks and uncertainties associated with developing drugs, including the uncertainty of:

? the scope, rate of progress and expense of our clinical trials and other

research and development activities;

? the potential benefits of our products and product candidates over other

therapies;

our ability to market, commercialize and achieve market acceptance for any of

? our products or product candidates that we are developing or may develop in the

future, including our ability to negotiate pricing and reimbursement terms


   acceptable to us;


 ? clinical trial results;

? the terms and timing of regulatory approvals; and

? the expense of filing, prosecuting, defending and enforcing patent claims and

other intellectual property rights.

A change in the outcome of any of these variables with respect to the development of our products or product candidates could mean a significant change in the costs and timing associated with the development of that product or product candidate. For example, if the EMA or FDA or other regulatory authority were to require us to conduct clinical trials beyond those which we currently anticipate will be required for the completion of clinical development of any of our products or product candidates or if we experience significant delays in enrollment in any of our clinical trials, we could be required to expend significant additional financial resources and time on the completion of clinical development. In addition, the uncertainty with respect to the duration, nature and extent of negative impacts of the COVID-19 pandemic and responsive measures relating thereto on our ability to successfully enroll our current and future clinical trials, has caused us to experience delays, and may cause us to experience further delays, in our clinical trials and regulatory submissions.

Selling, general and administrative expense

Selling, general and administrative expenses consist primarily of salaries and other related costs for personnel, including share-based compensation expenses, in our executive, legal, business development, commercial, finance, accounting, information technology and human resource functions. Other selling, general and administrative expenses include facility-related costs not otherwise included in research and development expense; advertising and promotional expenses; costs associated with industry and trade shows; and professional fees for legal services, including patent-related expenses, accounting services and miscellaneous selling costs.

We expect that selling, general and administrative expenses will increase in future periods in connection with our continued efforts to commercialize our products, including increased payroll, expanded infrastructure, commercial operations, increased consulting, legal, accounting and investor relations expenses.

Interest expense, net

Interest expense, net consists of interest expense from the liability for the sale of future royalties related to the Royalty Purchase Agreement, and from the Convertible Notes outstanding.

Critical accounting policies and significant judgments and estimates

Our management's discussion and analysis of our financial condition and results of operations is based on our financial statements, which we have prepared in accordance with generally accepted accounting principles in the United States. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts



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of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported revenues and expenses during the reporting periods. Actual results may differ from these estimates under different assumptions or conditions.

During the three months ended March 31, 2022, there were no material changes to our critical accounting policies as reported in our 2021 Annual Report on Form 10-K.

Results of operations

Three months ended March 31, 2022 compared to three months ended March 31, 2021

The following table summarizes revenues and selected expense and other income data for the three months ended March 31, 2022 and 2021.



                                                      Three Months Ended
                                                          March 31,                Change
(in thousands)                                        2022          2021        2022 vs. 2021
Net product revenue                                $  129,832    $   91,280    $        38,552
Collaboration revenue                                       7        20,007           (20,000)
Royalty revenue                                        18,896         6,655             12,241
Cost of product sales, excluding amortization
of acquired intangible asset                           10,135         9,104              1,031
Amortization of acquired intangible asset              23,473        11,278             12,195
Research and development expense                      140,078       134,513              5,565
Selling, general and administrative expense            73,271        61,095             12,176
Change in the fair value of deferred and
contingent consideration                             (11,700)           100           (11,800)
Interest expense, net                                (23,514)      (19,159)            (4,355)
Other expense, net                                   (11,855)      (10,884)              (971)
Income tax expense                                    (4,835)         (451)            (4,384)

Net product revenues. Net product revenues were $129.8 million for the three months ended March 31, 2022, an increase of $38.6 million, or 42%, from $91.3 million for the three months ended March 31, 2021. The increase in net product revenue was primarily due to an increase in net product sales of Translarna and Emflaza. Translarna net product revenues were $79.2 million for three months ended March 31, 2022, an increase of $32.7 million, or 70%, compared to $46.5 million for the three months ended March 31, 2021. These results reflect an increase in net product sales in existing markets as well as continued geographic expansion. Emflaza net product revenues were $48.6 million for the three months ended March 31, 2022, an increase of $5.1 million, or 12%, compared to $43.5 million for the three months ended March 31, 2021. These results reflect continued addition of new patients, continued high compliance, and appropriate weight-based dosing.

Collaboration revenues. Collaboration revenues were $0.0 million for the three months ended March 31, 2022, a decrease of $20.0 million, or over 100%, from $20.0 million for the three months ended March 31, 2021. The decrease is related to no milestones triggered from Roche in the three months ended March 31, 2022, as compared to a $20.0 million milestone payment from Roche that was triggered in the three months ended March 31, 2021, relating to the first commercial sale of Evrysdi in the EU, which was made in March 2021.

Royalty revenue. Royalty revenue was $18.9 million for the three months ended March 31, 2022, an increase of $12.2 million, or over 100%, from $6.7 million for the three months ended March 31, 2021. The increase in royalty revenue was due to higher Evrysdi sales in the three months ended March 31, 2022 as compared to the three months ended March 31, 2021. In accordance with the SMA License Agreement, we are entitled to royalties on worldwide annual net sales of the product.

Cost of product sales, excluding amortization of acquired intangible asset. Cost of product sales, excluding amortization of acquired intangible asset, were $10.1 million for the three months ended March 31, 2022, an increase of $1.0 million,



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or 11%, from $9.1 million for the three months ended March 31, 2021. Cost of product sales consist primarily of royalty payments associated with Emflaza and Translarna net product sales, excluding contingent payments to Marathon Pharmaceuticals, LLC (now known as Complete Pharma Holdings, LLC), or Marathon, costs associated with Emflaza and Translarna product 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, is primarily due to the increase in net product revenue and royalty revenue.

Amortization of acquired intangible asset. Amortization of our intangible assets was $23.5 million for the three months ended March 31, 2022, an increase of $12.2 million, or over 100%, from $11.3 million for the three months ended March 31, 2021. These amounts are related to the acquisition of all rights to Emflaza acquired in May 2017, Marathon contingent payments, and our Waylivra and Tegsedi intangible assets. The increase is primarily related to additional Marathon contingent payments. The amount allocated to the Emflaza intangible asset is amortized on a straight-line basis over its estimated useful life of approximately seven years from the date of the completion of the acquisition of all rights to Emflaza, the period of estimated future cash flows. The Marathon contingent payments, including a $50 million contingent milestone payment made in the three months ended March 31, 2022, are amortized prospectively as incurred, straight-line, over the remaining useful life of the Emflaza intangible asset. The Waylivra and Tegsedi assets are amortized on a straight-line basis over their estimated useful life of approximately ten years, respectively. Additionally, in August 2021, we made a $4.0 million milestone payment to Akcea upon regulatory approval of Waylivra from ANVISA. In accordance with the guidance for an asset acquisition, we recorded the milestone payment when it became payable to Akcea, and it increased the cost basis for the Waylivra intangible asset. This payment is being amortized to cost of product sales over the expected remaining useful life of the Waylivra asset on a straight line basis.

Research and development expense. Research and development expense was $140.1 million for the three months ended March 31, 2022, an increase of $5.6 million, or 4%, from $134.5 million for the three months ended March 31, 2021. The increase in research and development expenses is primarily related to increased investment in research programs and advancement of the clinical pipeline.

Selling, general and administrative expense. Selling, general and administrative expense was $73.3 million for the three months ended March 31, 2022, an increase of $12.2 million, or 20%, from $61.1 million for the three months ended March 31, 2021. The increase reflects our continued investment to support our commercial activities including our expanding commercial portfolio.

Change in the fair value of deferred and contingent consideration. The change in the fair value of deferred and contingent consideration was a gain of $11.7 million for the three months ended March 31, 2022, a change of $11.8 million, or over 100%, from a loss of $0.1 million for the three months ended March 31, 2021. The change is related to the fair valuation of the potential future consideration to be paid to former equityholders of Agilis as a result of our merger with Agilis which closed in August 2018. Changes in the fair value were due to the re-calculation of discounted cash flows for the passage of time and changes to certain other estimated assumptions.

Interest expense, net. Interest expense, net was $23.5 million for the three months ended March 31, 2022, an increase of $4.4 million, or 23%, from $19.2 million for the three months ended March 31, 2021. The increase in interest expense, net was primarily due to interest expense recorded from the liability for the sale of future royalties related to the Royalty Purchase Agreement.

Other expense, net. Other expense, net was $11.9 million for the three months ended March 31, 2022, an increase of $1.0 million, or 9%, from other expense, net of $10.9 million for the three months ended March 31, 2021. The change in other expense, net resulted primarily from an unrealized foreign exchange loss from the remeasurement of our intercompany loan and unrealized losses on our equity investments and convertible debt security in ClearPoint Neuro, Inc. of $1.0 million and $1.5 million, respectively.

Income tax expense. Income tax expense was $4.8 million for the three months ended March 31, 2022, an increase of $4.4 million, or over 100%, compared to income tax expense of $0.5 million for the three months ended March 31, 2021. The increase in income tax expense is primarily attributable to the capitalization and amortization of Section 174 expenditures which took effect in 2022 pursuant to TCJA amendments to IRC Section 174. We incur income tax expense in various



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foreign jurisdictions, and our foreign tax liabilities are largely dependent upon the distribution of pre-tax earnings among these different jurisdictions.

Liquidity and capital resources

Sources of liquidity

Since inception, we have incurred significant operating losses.

As a growing commercial-stage biopharmaceutical company, we are engaging in significant commercialization efforts for our products while also devoting a substantial portion of our efforts on research and development related to our products, product candidates and other programs. To date, almost all of our product revenue has been attributable to sales of Translarna for the treatment of nmDMD in territories outside of the United States and from Emflaza for the treatment of DMD in the United States. Our ongoing ability to generate revenue from sales of Translarna for the treatment of nmDMD is dependent upon our ability to maintain our marketing authorizations in Brazil, Russia and in the EEA and secure market access through commercial programs following the conclusion of pricing and reimbursement terms at sustainable levels in the member states of the EEA or through EAP programs in the EEA and other territories. The marketing authorization requires annual review and renewal by the European Commission following reassessment by the EMA of the benefit-risk balance of the authorization and is subject to the specific obligation to conduct Study 041. Our ability to generate product revenue from Emflaza will largely depend on the coverage and reimbursement levels set by governmental authorities, private health insurers and other third-party payors.

We have historically financed our operations primarily through the issuance and sale of our common stock in public offerings, our "at the market offering" of our common stock, proceeds from the Royalty Purchase Agreement, the private placements of our preferred stock, collaborations, bank and institutional lender debt, convertible debt financings and grants and clinical trial support from governmental and philanthropic organizations and patient advocacy groups in the disease areas addressed by our product candidates. We expect to continue to incur significant expenses and operating losses for at least the next fiscal year. The net losses we incur may fluctuate significantly from quarter to quarter.

In August 2015, we closed a private offering of $150.0 million in aggregate principal amount of 3.00% convertible senior notes due 2022 including the exercise by the initial purchasers of an option to purchase an additional $25.0 million in aggregate principal amount of the 2022 Convertible Notes. The 2022 Convertible Notes bear cash interest payable on February 15 and August 15 of each year, beginning on February 15, 2016. The 2022 Convertible Notes are senior unsecured obligations of ours and will mature on August 15, 2022, unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. We received net proceeds from the offering of approximately $145.4 million, after deducting the initial purchasers' discounts and commissions and the estimated offering expenses payable by us.

In August 2019, we entered into the Sales Agreement, 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. See "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations-Corporate Updates-Funding" for additional information.

In September 2019, we closed a private offering of $287.5 million aggregate principal amount of 1.50% convertible senior notes due 2026 including the full exercise by the initial purchasers of an option to purchase an additional $37.5 million in aggregate principal amount of the 2026 Convertible Notes. The 2026 Convertible Notes bear cash interest at a rate of 1.50% per year, payable semi-annually on March 15 and September 15 of each year, beginning on March 15, 2020. The 2026 Convertible Notes will mature on September 15, 2026, unless earlier repurchased or converted. We received net proceeds of $279.3 million after deducting the initial purchasers' discounts and commissions and the offering expenses payable by us.



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In July 2020, we entered into the Royalty Purchase Agreement. Pursuant to the Royalty Purchase Agreement, we sold to RPI the Assigned Royalty Payment in consideration for $650.0 million.

Cash flows

As of March 31, 2022, we had cash, cash equivalents and marketable securities of $587.8 million.

The following table provides information regarding our cash flows and our capital expenditures for the periods indicated.



                                Three Months Ended
                                    March 31,
(in thousands)                   2022        2021
Cash (used in) provided by:
Operating activities           (97,404)    (100,157)
Investing activities             49,043       30,147
Financing activities              1,168        9,531

Net cash used in operating activities was $97.4 million for the three months ended March 31, 2022 and $100.2 million for the three months ended March 31, 2021. The net cash used in operating activities primarily relates to supporting clinical development and commercial activities.

Net cash provided by investing activities was $49.0 million for the three months ended March 31, 2022 and $30.1 million for the three months ended March 31, 2021. Cash provided by investing activities for the three months ended March 31, 2022 and 2021 were primarily due to net sales and redemption of marketable securities, offset by acquisition of product rights.

Net cash provided by financing activities was $1.2 million for the three months ended March 31, 2022 and $9.5 million for the three months ended March 31, 2021. Cash provided by financing activities for the three months ended March 31, 2022 and 2021 were primarily attributable to cash received from the exercise of options, partially offset by payments on our finance lease principal.

Funding requirements

We anticipate that our expenses will continue to increase in connection with our commercialization efforts in the United States, the EEA, Latin America and other territories, including the expansion of our infrastructure and corresponding sales and marketing, legal and regulatory, distribution and manufacturing and administrative and employee-based expenses. In addition to the foregoing, we expect to continue to incur significant costs in connection with the research and development of our splicing, gene therapy, Bio-e, metabolic and oncology programs and our studies of emvododstat for COVID-19 as well as studies in our products for maintaining authorizations, including Study 041, label extensions and additional indications. In addition, we may incur substantial costs in connection with our efforts to advance our regulatory submissions. We continue to seek marketing authorization for Translarna for the treatment of nmDMD in territories that we do not currently have marketing authorization in. We submitted an MAA to the EMA for the treatment of AADC deficiency with PTC-AADC in the EEA and we expect an opinion from the CHMP in May 2022. We are preparing a BLA for PTC-AADC for the treatment of AADC deficiency in the United States and we expect to submit a BLA to the FDA in the third quarter of 2022. We filed for marketing authorization for Waylivra with ANVISA for the treatment of FPL and we expect a regulatory decision on approval from ANVISA in the second half of 2022. These efforts may significantly impact the timing and extent of our commercialization expenses.

In addition, our expenses will increase if and as we:

? seek to satisfy contractual and regulatory obligations we assumed in connection

with the Agilis Merger;

? seek to satisfy contractual and regulatory obligations in conjunction with the

Tegsedi-Waylivra Agreement;




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? satisfy contractual and regulatory obligations that we assumed through our

other acquisitions and collaborations;

? execute our commercialization strategy for our products and product candidates

that may receive marketing authorization;

are required to complete any additional clinical trials, non-clinical studies

? or Chemistry, Manufacturing and Controls, or CMC, assessments or analyses in

order to advance Translarna for the treatment of nmDMD in the United States or

elsewhere;

? utilize the Hopewell Facility to manufacture program materials for certain of

our gene therapy product candidates;

initiate or continue the research and development of our splicing, gene

? therapy, Bio-e, metabolic and oncology programs and our studies of emvododstat

for COVID-19 as well as studies in our products for maintaining authorizations,

including Study 041, label extensions and additional indications;

? seek to discover and develop additional product candidates;

? seek to expand and diversify our product pipeline through strategic

transactions;

? maintain, expand and protect our intellectual property portfolio; and

add operational, financial and management information systems and personnel,

? including personnel to support our product development and commercialization

efforts.

We believe that our cash flows from product sales, together with existing cash and cash equivalents, including our offerings of the Convertible Notes, public offerings of common stock, our "at the market offering" of our common stock, proceeds from the Royalty Purchase Agreement and marketable securities, will be sufficient to fund our operating expenses and capital expenditure requirements for at least the next twelve months. We have based this estimate on assumptions that may prove to be wrong, and we could use our capital resources sooner than we currently expect.

Our future capital requirements will depend on many factors, including:

? our ability to commercialize and market our products and product candidates

that may receive marketing authorization;

our ability to negotiate, secure and maintain adequate pricing, coverage and

? reimbursement terms, on a timely basis, with third-party payors for our

products and products candidates;

our ability to maintain the marketing authorization for our products, including

in the EEA for Translarna for the treatment of nmDMD and whether the EMA

? determines on an annual basis that the benefit-risk balance of Translarna

supports renewal of our marketing authorization in the EEA, on the current

approved label;

? the costs, timing and outcome of Study 041;

the costs, timing and outcome of our efforts to advance Translarna for the

treatment of nmDMD in the United States, including, whether we will be required

? to perform additional clinical trials, non-clinical studies or CMC assessments

or analyses at significant cost which, if successful, may enable FDA review of

an NDA re-submission by us and, ultimately, may support approval of Translarna

for nmDMD in the United States;

? unexpected decreases in revenue or increases in expenses resulting from the

COVID-19 pandemic;

? our ability to maintain orphan exclusivity in the United States for Emflaza;




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? our ability to successfully complete all post-marketing requirements imposed by

regulatory agencies with respect to our products;

the progress and results of activities under our splicing, gene therapy, Bio-e,

? metabolic and oncology programs and our studies of emvododstat for COVID-19 as

well as studies in our products for maintaining authorizations, label

extensions and additional indications;

the scope, costs and timing of our commercialization activities, including

product sales, marketing, legal, regulatory, distribution and manufacturing,

? for any of our products and for any of our other product candidates that may

receive marketing authorization or any additional territories in which we

receive authorization to market Translarna;

the costs, timing and outcome of regulatory review of our splicing, gene

? therapy, Bio-e, metabolic and oncology programs and our studies of emvododstat

for COVID-19 and Translarna in other territories;

? our ability to utilize the Hopewell Facility to manufacture program materials

for certain of our gene therapy product candidates;

? our ability to satisfy our obligations under the indentures governing the

Convertible Notes;

? the timing and scope of growth in our employee base;

the scope, progress, results and costs of preclinical development, laboratory

? testing and clinical trials for our other product candidates, including those

in our splicing, gene therapy, Bio-e, metabolic and oncology programs;

? revenue received from commercial sales of our products or any of our product

candidates;

our ability to obtain additional and maintain existing reimbursed named patient

? and cohort EAP programs for Translarna for the treatment of nmDMD on adequate

terms, or at all;

the ability and willingness of patients and healthcare professionals to access

? Translarna through alternative means if pricing and reimbursement negotiations

in the applicable territory do not have a positive outcome;

the costs of preparing, filing and prosecuting patent applications,

? maintaining, and protecting our intellectual property rights and defending

against intellectual property-related claims;

the extent to which we acquire or invest in other businesses, products, product

candidates, and technologies, including the success of any acquisition,

? in-licensing or other strategic transaction we may pursue, and the costs of

subsequent development requirements and commercialization efforts, including

with respect to our acquisitions of Emflaza, Agilis, our Bio-E platform and

Censa and our licensing of Tegsedi and Waylivra; and

our ability to establish and maintain collaborations, including our

? collaborations with Roche and the SMA Foundation, and our ability to obtain

research funding and achieve milestones under these agreements.

With respect to our outstanding 2022 Convertible Notes, cash interest payments are payable on a semi-annual basis in arrears, which require total funding of $4.5 million annually. The 2022 Convertible Notes will mature on August 15, 2022 and we will be required to pay any outstanding principal amount of the 2022 Convertible Notes at that time, unless earlier converted, redeemed or repurchased in accordance with their terms prior to such date. As of February 15, 2022, until the close of business on the business day immediately preceding the maturity date, holders may convert their 2022 Convertible Notes at any time. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our common stock or any combination thereof at our election. With respect to our outstanding 2026 Convertible Notes, cash interest payments are payable on a semi-annual basis in arrears, which will require total funding of $4.3 million annually.



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In addition, in the first quarter of 2022, we paid Marathon Pharmaceuticals, LLC (now known as Complete Pharma Holdings, LLC), or Marathon, a single $50.0 million sales-based milestone in connection with Emflaza. We expect to pay the former equityholders of Agilis an aggregate of $70.0 million upon the achievement of certain development and regulatory milestones in 2022 relating to PTC-AADC. We also expect to pay the former securityholders of Censa a $30.0 million development milestone for the completion of enrollment of a Phase 3 clinical trial for PTC923 for PKU in 2022. If achieved, we have the option to pay such milestone payment in cash or shares of our common stock.

We also have certain significant contractual obligations and commercial commitments that require funding and we have disclosed these items under the heading "Management's Discussion and Analysis of Financial Condition and Results of Operations-Funding Obligations" in our 2021 Annual Report on Form 10-K. There were no material changes to these obligations and commitments during the period ended March 31, 2022 . Furthermore, since we are a public company, we have incurred and expect to continue to incur additional costs associated with operating as such including significant legal, accounting, investor relations and other expenses.

We will need to generate significant revenues to achieve and sustain profitability, and we may never do so. We may need to obtain substantial additional funding in connection with our continuing operations. Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs primarily through a combination of equity offerings, debt financings, collaborations, strategic alliances, grants and clinical trial support from governmental and philanthropic organizations and patient advocacy groups in the disease areas addressed by our product and product candidates and marketing, distribution or licensing arrangements. Adequate additional financing may not be available to us on acceptable terms, or at all. To the extent that we raise additional capital through the sale of equity or convertible debt securities, our shareholders ownership interest will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us.

If we are unable to raise additional funds through equity, debt or other financings when needed or on attractive terms, we may be required to delay, limit, reduce or terminate our product development or commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

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