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– GRAND CANYON is the first pivotal study of an investigational therapy for Becker – – CANYON, the initial Phase 2 cohorts, is fully enrolled – BOULDER, Colo.--(BUSINESS WIRE)-- Edgewise Therapeutics, Inc. (Nasdaq: EWTX), a leading muscle disease biopharmaceutical company, today announced the start of enrollment of GRAND CANYON, a global pivotal study of EDG-5506 in individuals with Becker. GRAND CANYON is an expansion of the CANYON study. CANYON, which was over-enrolled, includes 39 adults and 24 adolescents. EDG-5506 is an orally administered small molecule designed to prevent contraction-induced muscle damage in dystrophinopathies including Becker and Duchenne muscular dystrophy. There are currently no approved therapies for individuals with Becker, a serious genetic, progressive neuromuscular disorder with significant unmet need. GRAND CANYON is a multicenter, randomized, double-blind, placebo-controlled study to evaluate the safety and efficacy of EDG-5506 in adults with Becker. Data from GRAND CANYON, if positive, could support a marketing application. The primary endpoint of GRAND CANYON is North Star Ambulatory Assessment (NSAA). In addition, other functional assessments, biomarkers of muscle damage and safety will be assessed. GRAND CANYON is anticipated to recruit approximately 120 individuals with Becker, aged between 18 and 50 years old, at up to 50 sites in 10 countries. The treatment period for participants will be 18 months. To learn more, go to clinicaltrials.gov (NCT05291091) or the GRAND CANYON microsite: . “Based on the strength of safety, functional and biomarker results from our ARCH open label study, we have rapidly initiated this ground-breaking clinical study,” said Joanne Donovan, M.D., Ph.D., Chief Medical Officer of Edgewise. “This study is critical for the Becker community, as there currently are no approved treatments for Becker, a condition that for far too long has been neglected.” “It is exciting to move to the next stage of testing of the clinical hypothesis that a reduction in contraction-induced muscle damage has the potential to benefit people living with muscular dystrophies,” said Alan Russell, Ph.D., Co-Founder and Chief Scientific Officer of Edgewise. “Having seen promising preclinical results with EDG-5506 translate clinically, I am thrilled we are entering into a pivotal study.” Edgewise will host a community webinar with Parent Project Muscular Dystrophy on October 18, 2023, at 1:00 pm ET to share details about the trial and answer questions from the community. The registration page will be available on the PPMD website in early October. Positive 12-Month Results from the ARCH Open Label Study of EDG-5506 in Adults with Becker The ongoing ARCH study is an open label, single-center study assessing the safety, tolerability, impact on muscle damage biomarkers, function and pharmacokinetics (PK) of EDG-5506 in adults with Becker. The ARCH study is evaluating varying doses of EDG-5506 administered daily over 24 months in 12 adults with Becker. The Company reported data at the end of 12 months of treatment with EDG-5506. EDG-5506 was well-tolerated in all participants with no dose reductions or discontinuations due to adverse events. Consistent with prior observations, significant decreases in key biomarkers of muscle damage were seen with treatment with EDG-5506. Importantly, creatine kinase (CK) and fast skeletal muscle troponin I were reduced by an average of 37% (p=0.001) and 79% (p<0.0001) from baseline, respectively, at the participants’ 12-month visit. After 12 months of EDG-5506 dosing, North Star Ambulatory Assessment (NSAA) scores continued to trend in a positive direction. Nine of the twelve participants showed either a functional improvement (n=6) or exhibited stability (n=3) on NSAA scores relative to their baselines. NSAA scores showed a consistent positive trend that diverges from trajectories observed in the natural history studies reported by Bello et al. (2016)1 and van de Velde et al. (2021)2 in which the yearly decline was -1.2 NSAA points. Overall, after one-year, there was a +0.4-point trend toward improvement on the NSAA compared to the -1.2-point decline observed in natural history studies in Becker patients. 1, 2 The encouraging results from the 12-month ARCH study support the hypothesis that a reduction in contraction-induced muscle damage in muscular dystrophies has the potential to preserve and improve muscle function while preventing disease progression in dystrophinopathies. Observations from ARCH identified key factors, including the dose of EDG-5506, for the design of a potentially registrational trial. Go to clinicaltrials.gov to learn more about this study (NCT05160415). About Becker Muscular Dystrophy Becker is a genetic, progressive neuromuscular disorder that imposes significant physical, emotional, financial, and social impacts predominantly on males and their caregivers. Genetic mutations in the dystrophin gene resulting in Becker lead to contraction-induced muscle damage, which is the primary driver of muscle loss and impaired motor function in muscular dystrophies. Functional decline can begin at any age, and once that muscle loss occurs, the decline in function is irreversible and continues throughout the individual’s life. Some individuals living with Becker experience heart failure from cardiomyopathy, which may result in heart transplantation or early death. Currently there is no cure for Becker; early and long-term multidisciplinary care from neuromuscular specialists, cardiologists, physical therapists, and other specialists is critical for optimized disease management. Novel therapies are in development for Becker, including muscle targeted interventions, aimed at positively impacting disease trajectory. About EDG-5506 for Becker and Duchenne Muscular Dystrophies EDG-5506 is an orally administered small molecule designed to prevent contraction-induced muscle damage in dystrophinopathies including Duchenne and Becker. EDG-5506 presents a novel mechanism of action designed to selectively limit the exaggerated muscle damage caused by the absence or loss of functional dystrophin. By minimizing the progressive muscle damage that leads to functional impairment, EDG-5506 has the potential to benefit a broad range of patients suffering from debilitating genetic neuromuscular disorders. It is anticipated to be used as a single agent therapy, but it may also provide an additional benefit in combination with available therapies and therapies currently in development. In August 2021, the U.S. Food and Drug Administration (FDA) granted Fast Track designation to EDG-5506 for the treatment of individuals with Becker. The Company has completed a Phase 1 clinical trial of EDG-5506 designed to evaluate safety, tolerability, PK and pharmacodynamics of EDG-5506 in adult healthy volunteers (Phase 1a) and in adults with Becker (Phase 1b) (NCT04585464). In ARCH, an open-label, single-center trial (NCT05160415) assessing long-term safety and PK, decreases in biomarkers of muscle damage and trends toward improvement in NSAA have been observed following 12 months of treatment with EDG-5506. The Phase 2 trial of EDG-5506 in Becker (CANYON) has been expanded to include an additional 120 adult participants in a pivotal cohort called GRAND CANYON. CANYON is fully enrolled; GRAND CANYON is currently enrolling. LYNX, an ongoing Phase 2 trial (NCT05540860), is assessing safety, PK and biomarkers of muscle damage in participants with Duchenne. The Company is also continuing to recruit the DUNE Phase 2 exercise challenge study, to evaluate the effect of EDG-5506 on biomarkers of muscle damage following exercise in adults with LGMD2I, Becker or McArdle disease at a single site in Denmark. About Edgewise Therapeutics Edgewise Therapeutics is a leading muscle disease biopharmaceutical company developing novel therapeutics for muscular dystrophies and serious cardiac conditions. The company’s deep expertise in muscle physiology is driving a new generation of first-in-class therapeutics. EDG-5506 is an orally administered skeletal myosin inhibitor in advanced clinical trials in patients with Becker, Duchenne, and Limb-Girdle muscular dystrophies as well as McArdle Disease. EDG-7500, currently in a Phase 1 trial, is a novel cardiac sarcomere modulator for the treatment of HCM and other disorders of cardiac diastolic dysfunction. The entire team at Edgewise is dedicated to our mission: changing the lives of patients and families affected by serious muscle diseases. To learn more, go to: or follow us on LinkedIn, X (formerly Twitter), Facebook, Instagram and Threads. References [1] Bello L, et al., Functional Changes in Becker Muscular Dystrophy: Implications for Clinical Trials in Dystrophinopathies, Scientific Reports, 2016. [2] van de Velde et al., Selection Approach to Identify the Optimal Biomarker Using Quantitative Muscle MRI and Functional Assessments in Becker Muscular Dystrophy, Neurology, 2021. Cautionary Note Regarding Forward-Looking Statements This press release contains forward-looking statements as that term is defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Statements in this press release that are not purely historical are forward-looking statements. Such forward-looking statements include, among other things, statements regarding the potential of, and expectations regarding EDG-5506 and statements regarding Edgewise’s expectations relating to its clinical trials, including the GRAND CANYON study and enrollment of such study. Words such as “believes,” “anticipates,” “plans,” “expects,” “intends,” “will,” “goal,” “potential” and similar expressions are intended to identify forward-looking statements. The forward-looking statements contained herein are based upon Edgewise’s current expectations and involve assumptions that may never materialize or may prove to be incorrect. Actual results could differ materially from those projected in any forward-looking statements due to numerous risks and uncertainties, including but not limited to: risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics and operating as an early clinical stage company including the potential for Edgewise’s product candidates to cause serious adverse events; Edgewise’s ability to develop, initiate or complete preclinical studies and clinical trials for, obtain approvals for and commercialize any of its product candidates; the timing, progress and results of preclinical studies and clinical trials for EDG-5506; Edgewise’s ability to enroll and maintain patients in clinical trials; Edgewise’s ability to raise any additional funding it will need to continue to pursue its business and product development plans; the timing, scope and likelihood of regulatory filings and approvals; the potential for any clinical trial results to differ from preclinical, interim, preliminary, topline or expected results; Edgewise’s ability to develop a proprietary drug discovery platform to build a pipeline of product candidates; Edgewise’s manufacturing, commercialization and marketing capabilities and strategy; the size of the market opportunity for Edgewise’s product candidates; the loss of key scientific or management personnel; competition in the industry in which Edgewise operates; Edgewise’s reliance on third parties; Edgewise’s ability to obtain and maintain intellectual property protection for its product candidates; general economic and market conditions; and other risks. Information regarding the foregoing and additional risks may be found in the section entitled “Risk Factors” in documents that Edgewise files from time to time with the U.S. Securities and Exchange Commission. These forward-looking statements are made as of the date of this press release, and Edgewise assumes no obligation to update the forward-looking statements, or to update the reasons why actual results could differ from those projected in the forward-looking statements, except as required by law. This press release contains hyperlinks to information that is not deemed to be incorporated by reference into this press release.

– Announced positive 12-month topline results from the ARCH open label study of EDG-5506 in adults with Becker muscular dystrophy (Becker) – – Advancing Phase 2 trial of EDG-5506 in Becker muscular dystrophy (Becker, CANYON), which now includes a pivotal cohort called GRAND CANYON – – Advancing Phase 2 trial of EDG-5506 in Duchenne muscular dystrophy (Duchenne, LYNX) – – Advancing EDG-7500, a novel sarcomere modulator for hypertrophic cardiomyopathy (HCM); Phase 1 start expected in 2H2023 – – Cash, cash equivalents and marketable securities of $310 million as of June 30, 2023 – BOULDER, Colo.--(BUSINESS WIRE)-- Edgewise Therapeutics, Inc., (Nasdaq: EWTX), a clinical-stage biopharmaceutical company focused on the discovery, development, and commercialization of innovative treatments for severe, genetic neuromuscular and cardiac disorders for which there is significant unmet medical need, today reported financial results for the second quarter of 2023 and recent business highlights. “Edgewise has made significant progress in the first half of the year most notably with the positive ARCH data that have allowed us to quickly pivot our CANYON study to include a potentially registration-enabling cohort in individuals with Becker, a disorder for which there are no approved treatments,” said Kevin Koch, Ph.D., President and Chief Executive Officer of Edgewise. “The team continues to advance our LYNX, CANYON and DUNE clinical trials of EDG-5506 in addition to advancing EDG-7500, our novel sarcomere modulator for HCM, towards the clinic. Over the coming months, we expect to start enrolling GRAND CANYON and a Phase 1 trial of EDG-7500 and share interim Duchenne data from our Phase 2 LYNX trial.” Recent Highlights Announced Positive 12-Month Topline Results from the ARCH Open Label Study of EDG-5506 in Adults with Becker The Company announced positive 12-month topline results from the ongoing ARCH study, an open label, single-center study assessing the safety, tolerability, impact on muscle damage biomarkers, function and pharmacokinetics (PK) of EDG-5506 in adults with Becker. The ARCH study is evaluating varying doses of EDG-5506 administered daily over 24 months in 12 adults with Becker. The Company reported data at the end of 12 months of treatment with EDG-5506. EDG-5506 was well-tolerated in all participants with no dose reductions or discontinuations due to adverse events. Consistent with prior observations, treatment with EDG-5506 led to significant decreases in key biomarkers of muscle damage. Importantly, creatine kinase (CK) and fast skeletal muscle troponin I were reduced by an average of 37% (p=0.001) and 79% (p<0.0001) from baseline, respectively, at the participants’ 12-month visit. After 12 months of EDG-5506 dosing, North Star Ambulatory Assessment (NSAA) scores continued to trend in a positive direction. Nine of the twelve participants showed either a functional improvement (n=6) or exhibited stability (n=3) on NSAA scores relative to their baselines. NSAA scores showed a consistent positive trend that diverges from trajectories observed in the natural history studies reported by Bello et al. (2016)1 and van de Velde et al. (2021)2 in which the yearly decline was -1.2 NSAA points. Overall, one-year functional results were observed to have a +0.4-point improvement on the NSAA compared to the -1.2-point anticipated natural history decline in Becker patients. The positive results from the 12-month ARCH study support the hypothesis that a reduction in contraction-induced muscle damage in muscular dystrophies, has the potential to preserve and improve muscle function while preventing disease progression in dystrophinopathies. Observations from ARCH identified key factors, including the dose of EDG-5506, for the design of a potentially registrational trial. Go to clinicaltrials.gov to learn more about this study (NCT05160415). Announced GRAND CANYON Pivotal Cohort of EDG-5506 in Individuals with Becker The Company announced plans to expand the placebo-controlled Phase 2 CANYON trial of EDG-5506 to include a new global pivotal cohort, called GRAND CANYON, that is a potentially registrational cohort with NSAA as the primary endpoint. GRAND CANYON is anticipated to recruit approximately 120 Becker patients who will receive study drug for 18 months. GRAND CANYON is anticipated to begin enrollment in the second half of 2023. Go to clinicaltrials.gov to learn more (NCT05291091). Advancing LYNX Phase 2 Clinical Trial of EDG-5506 in Children with Duchenne The Company is recruiting the LYNX Phase 2 clinical trial of EDG-5506 in children with Duchenne. LYNX is a placebo-controlled trial to assess the effect of multiple doses of EDG-5506 over 12 weeks on safety, PK and biomarkers of muscle damage. Approximately 27 children with Duchenne aged 4 to 9 years on stable corticosteroids and/or exon skippers are expected to be enrolled at up to 14 sites across the United States. Participants will then continue in an open-label extension portion of the trial for a total of 12 months to gain further insights into safety and functional measures. Importantly, this trial is designed to identify the optimal dose of EDG-5506 that reduces biomarkers of muscle damage and has the potential to provide functional benefit to patients in a Phase 3 trial. The Company expects to report Phase 2 interim data in the fourth quarter of 2023. Go to clinicaltrials.gov to learn more about this trial (NCT05540860). Advancing DUNE Phase 2 Trial of EDG-5506 in Adults with LGMD2I/R9, Becker and McArdle Disease The Company is continuing to recruit the DUNE Phase 2 exercise challenge study, to evaluate the effect of EDG-5506 on biomarkers of muscle damage following exercise in adults with LGMD2I/R9, Becker or McArdle disease at a single site in Denmark. Participants in the placebo-controlled study are enrolled for 16 weeks, then continue to an open label extension through 52 weeks. The goal of this trial is to assess safety and efficacy in individuals with myopathy distinct from Duchenne/Becker where muscle contraction is associated with exaggerated injury. LGMD2I/R9 is a muscular dystrophy caused by a dysfunctional dystroglycan complex while McArdle is caused by deficiencies in glycogen mobilization leading to metabolic crisis and injury of skeletal muscle. In addition to biomarkers of muscle damage, secondary measures will include measures of strength and exercise capacity. Advancing EDG-7500, a First-In-Class Sarcomere Modulator for HCM The Company is continuing to advance EDG-7500, a first-in-class oral, selective, sarcomere modulator for diseases of diastolic dysfunction, with plans to initiate a Phase 1 trial in the second half of 2023, subject to obtaining IND clearance. EDG-7500 is a result of Edgewise’s robust discovery platform that is yielding novel compounds targeting important unmet needs of patients suffering from disorders of cardiac and skeletal muscle. The compound is designed to improve impaired cardiac relaxation and slow contraction velocity, hallmarks of HCM. This novel mechanism is anticipated to have a broader therapeutic index relative to cardiac myosin inhibition for treatment of both obstructive and non-obstructive HCM. Preclinical data of EDG-7500 support beneficial activity in both obstructive HCM and non-obstructive HCM with minimal changes in left ventricle contractility. Strengthened Engagement with Muscular Dystrophy Patient Communities Leadership presented at the Parent Project Muscular Dystrophy (PPMD) Annual Conference in June 2023, during the “Emerging Therapies in Becker” session and the “Research Row” session. The Company’s presentations are available on the Edgewise website. Additionally, leadership discussed and answered questions about the Company’s clinical trials in Becker during a patient community webinar hosted by PPMD in May 2023. A replay of the webinar can be viewed here. The Company continues to sponsor and participate in numerous patient-focused events hosted by patient advocacy organizations. Second Quarter Financial Results Cash, cash equivalents and marketable securities were approximately $310 million as of June 30, 2023. Research and development (R&D) expenses were $19.6 million for the second quarter of 2023, compared to $19.9 million for the immediately preceding quarter. The decrease of $0.3 million was primarily driven by a decrease of $1.5 million in preclinical development expense based on higher costs incurred in the first quarter related to IND-enabling studies and API manufactured for EDG-7500. This decrease was partially offset by an increase of $0.8 million in personnel-related costs and facilities and other costs that support the growth of the company’s R&D programs, and $0.3 million of higher expenses related to the EDG-5506 clinical program such as clinical site and contract research organization costs to support ongoing Phase 2 trials. General and Administrative (G&A) expenses were $5.8 million for the second quarter of 2023, compared to $5.8 million for the immediately preceding quarter. Net loss and net loss per share for the second quarter of 2023 was $21.5 million or $0.34 per share, compared to $22.9 million or $0.36 per share for the immediately preceding quarter. About EDG-5506 EDG-5506 is an orally administered small molecule designed to prevent contraction-induced muscle damage in dystrophinopathies including Duchenne and Becker. EDG-5506 presents a novel mechanism of action designed to selectively limit the exaggerated muscle damage caused by the absence or loss of functional dystrophin. By minimizing the progressive muscle damage that leads to functional impairment, EDG-5506 has the potential to benefit a broad range of patients suffering from debilitating genetic neuromuscular disorders. It is anticipated to be used as a single agent therapy, but it may also provide an additional benefit in combination with available therapies and therapies currently in development. In August 2021, the U.S. Food and Drug Administration (FDA) granted Fast Track designation to EDG-5506 for the treatment of individuals with Becker. The Company has completed a Phase 1 clinical trial of EDG-5506 designed to evaluate safety, tolerability, PK and pharmacodynamics of EDG-5506 in adult healthy volunteers (Phase 1a) and in adults with Becker (Phase 1b) (NCT04585464). In ARCH, an open-label, single-center trial (NCT05160415) assessing long-term safety and PK, decreases in biomarkers of muscle damage and trends toward improvement in NSAA have been observed following 12 months of treatment with EDG-5506. CANYON, an ongoing Phase 2 trial (NCT05291091), is assessing safety, PK, biomarkers of muscle damage, function and fat fraction as measured by muscle MRI in participants with Becker aged 12 to 50 years. CANYON now also includes the GRAND CANYON cohort, designed as a potentially registrational cohort with NSAA as the primary endpoint. LYNX, an ongoing Phase 2 trial (NCT05540860), is assessing safety, PK and biomarkers of muscle damage in participants with Duchenne. The Company is also continuing to recruit the DUNE Phase 2 exercise challenge study, to evaluate the effect of EDG-5506 on biomarkers of muscle damage following exercise in adults with LGMD2I, Becker or McArdle disease at a single site in Denmark. About EDG-7500 EDG-7500 is a first-in-class oral, selective, sarcomere modulator for HCM, and the Company plans to initiate a Phase 1 trial in the second half of 2023. The compound is designed to improve impaired cardiac relaxation and slow contraction velocity, hallmarks of HCM. This novel mechanism is anticipated to have a broader therapeutic index relative to cardiac myosin inhibition for treatment of both obstructive and non-obstructive HCM. Preclinical data of EDG-7500 support beneficial activity in both obstructive HCM and non-obstructive HCM with minimal changes in left ventricle contractility. About Edgewise Therapeutics Edgewise Therapeutics is a clinical-stage biopharmaceutical company focused on the discovery, development, and commercialization of innovative treatments for severe, genetic neuromuscular and cardiac disorders for which there is significant unmet medical need. Guided by its holistic drug discovery approach to targeting the muscle as an organ, Edgewise has combined its foundational expertise in muscle biology and small molecule engineering to build its proprietary, muscle-focused drug discovery platform. Edgewise’s platform utilizes custom-built high throughput and translatable systems that measure integrated muscle function in whole organ extracts to identify small molecule precision medicines regulating key proteins in muscle tissue. The Company’s lead candidate, EDG-5506, an investigational orally administered small molecule designed to protect injury-susceptible fast skeletal muscle fibers in dystrophinopathies, is advancing in multiple clinical trials in individuals with Duchenne, Becker and Limb Girdle 2I/R9 muscular dystrophies, and McArdle disease. The Company is also advancing EDG-7500, a novel sarcomere modulator for hypertrophic cardiomyopathy, with plans to initiate a Phase 1 trial in the second half of 2023. To learn more, go to: or follow us on LinkedIn, Twitter and Facebook. References [1] Bello L, et al., Functional Changes in Becker Muscular Dystrophy: Implications for Clinical Trials in Dystrophinopathies, Scientific Reports, 2016. [2] van de Velde et al., Selection Approach to Identify the Optimal Biomarker Using Quantitative Muscle MRI and Functional Assessments in Becker Muscular Dystrophy, Neurology, 2021. Cautionary Note Regarding Forward-Looking Statements This press release contains forward-looking statements as that term is defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Statements in this press release that are not purely historical are forward-looking statements. Such forward-looking statements include, among other things, statements regarding the potential of, and expectations regarding, Edgewise’s drug discovery platform, product candidates and programs, including EDG-5506 and EDG-7500; statements regarding Edgewise’s expectations relating to its preclinical studies and clinical trials, including timing of reporting data (including the Phase 2 interim data for the LYNX Phase 2 clinical trial of EDG-5506) and commencement of trials (including patient enrollment for GRAND CANYON and a Phase 1 trial of EDG-7500); statements regarding Edgewise’s pipeline of product candidates and programs; and statements by Edgewise’s president and chief executive officer. Words such as “believes,” “anticipates,” “plans,” “expects,” “intends,” “will,” “goal,” “potential” and similar expressions are intended to identify forward-looking statements. The forward-looking statements contained herein are based upon Edgewise’s current expectations and involve assumptions that may never materialize or may prove to be incorrect. Actual results could differ materially from those projected in any forward-looking statements due to numerous risks and uncertainties, including but not limited to: risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics and operating as an early clinical stage company including the potential for Edgewise’s product candidates to cause serious adverse events; Edgewise’s ability to develop, initiate or complete preclinical studies and clinical trials for, obtain approvals for and commercialize any of its product candidates for muscular dystrophy patients or other patient populations; the timing, progress and results of preclinical studies and clinical trials for EDG-5506 and the EDG-7500; Edgewise’s ability to obtain IND clearance for EDG-7500; Edgewise’s ability to raise any additional funding it will need to continue to pursue its business and product development plans; the timing, scope and likelihood of regulatory filings and approvals; the potential for any clinical trial results to differ from preclinical, interim, preliminary, topline or expected results; Edgewise’s ability to develop a proprietary drug discovery platform to build a pipeline of product candidates; Edgewise’s manufacturing, commercialization and marketing capabilities and strategy; the size of the market opportunity for Edgewise’s product candidates; the loss of key scientific or management personnel; competition in the industry in which Edgewise operates; Edgewise’s reliance on third parties; Edgewise’s ability to obtain and maintain intellectual property protection for its product candidates; general economic and market conditions; and other risks. Information regarding the foregoing and additional risks may be found in the section entitled “Risk Factors” in documents that Edgewise files from time to time with the U.S. Securities and Exchange Commission. These forward-looking statements are made as of the date of this press release, and Edgewise assumes no obligation to update the forward-looking statements, or to update the reasons why actual results could differ from those projected in the forward-looking statements, except as required by law. This press release contains hyperlinks to information that is not deemed to be incorporated by reference into this press release. Edgewise Therapeutics, Inc. Condensed Statement of Operations (in thousands except share and per share amounts, unaudited) Three months ended June 30, 2023 March 31, 2023 Operating expenses: Research and development $ 19,559 $ 19,876 General and administrative 5,780 5,828 Total operating expenses 25,339 25,704 Loss from operations (25,339 ) (25,704 ) Interest income 3,870 2,866 Net loss $ (21,469 ) $ (22,838 ) Net loss per share - basic and diluted $ (0.34 ) $ (0.36 ) Weighted-average shares outstanding, basic and diluted 63,380,430 63,265,800 Edgewise Therapeutics, Inc. Condensed Balance Sheet Data (in thousands, unaudited) June 30, December 31, 2023 2022 Assets Cash, cash equivalents and marketable securities $ 309,928 $ 351,947 Other assets 20,697 15,154 Total assets $ 330,625 $ 367,101 Liabilities and stockholders' equity Liabilities 19,170 20,385 Stockholders' equity 311,455 346,716 Total liabilities and stockholders' equity $ 330,625 $ 367,101

– Sustained positive trend in North Star Ambulatory Assessment (NSAA) scores relative to BMD natural history – – Significant decreases in levels of serum creatine kinase (CK) and fast skeletal muscle troponin I (TNNI2), enzyme biomarkers associated with skeletal muscle damage– – EDG-5506 was well-tolerated at all doses – – Company continuing to enroll patients with BMD in the CANYON Phase 2 trial which now includes a pivotal cohort called GRAND CANYON – – Edgewise leadership to discuss ARCH findings on Tuesday, June 27 at 8:30 a.m. Eastern Time at virtual investor event – BOULDER, CO, USA I June 26, 2023 I Edgewise Therapeutics, Inc., (Nasdaq: EWTX), a clinical-stage biopharmaceutical company focused on developing orally bioavailable, targeted, small molecule therapies for the treatment of devastating muscle disorders, announced today positive 12-month topline results from the ongoing ARCH study, an open label, single-center study assessing the safety, tolerability, impact on muscle damage biomarkers, and pharmacokinetics (PK) of EDG-5506 in adults with BMD. EDG-5506 is an orally administered small molecule designed to prevent contraction-induced muscle damage in dystrophinopathies including BMD and Duchenne muscular dystrophy (DMD). The ARCH study is evaluating varying doses of EDG-5506 administered daily over 24 months in 12 adults with BMD. The Company is reporting data at the end of 12 months of treatment with EDG-5506. EDG-5506 was well-tolerated in all participants with no discontinuations or dose reductions due to adverse events. Consistent with prior observations, treatment with EDG-5506 led to significant decreases in key biomarkers of muscle damage. Importantly, CK and TNNI2 were reduced by an average of 37% ( p= 0.001) and 79% ( p <0.0001) from baseline, respectively, at the participants 12-month visit. After 12 months of EDG-5506 dosing, NSAA scores continued to trend in a positive direction. Nine of the twelve participants showed either a functional improvement (n=6) or exhibited stable disease (n=3) on NSAA relative to their baselines. As seen in Figure 1, NSAA scores show a consistent positive trend that diverges from trajectories observed in the natural history studies reported by Bello et al. (2016) 1 and van de Velde et al. (2021) 2 in which the yearly decline was -1.2 NSAA points. Overall, one-year functional results were observed to have a +0.4-point improvement on the NSAA compared to the -1.2-point anticipated natural history decline in a population of BMD patients predicted to have a relentless course of disease progression. The positive results from the 12-month ARCH study support the hypothesis that a reduction in contraction-induced muscle damage in muscular dystrophies, associated with EDG-5506 administration, has the potential to preserve and improve muscle function while preventing disease progression in dystrophinopathies. Observations from ARCH identified key factors, including the optimal dosing strategy of EDG-5506, for the design of a potentially registrational trial. A pivotal cohort, GRAND CANYON, has been added to the CANYON study and is anticipated to begin enrollment in the third quarter of 2023. “ We are quite pleased by the robust and consistent results observed at 12 months with EDG 5506 treatment, which, together with the favorable safety/tolerability profile, are highly encouraging. Moreover, these data have allowed us to quickly pivot our CANYON study to include a potentially registration-enabling cohort, ” said Joanne Donovan, M.D., Ph.D., Chief Medical Officer of Edgewise. “ We thank the patients, their families, caregivers, and the broader Becker community, who are currently underserved with no available treatment options, for engaging with us on this promising therapy. ” “ Becker is a devastating, neuromuscular disease which currently has no approved therapies. In my experience, once symptoms of muscle weakness occur, muscle has already been lost. Once declining, individuals with Becker have a relentless course of disease progression, ” said Craig McDonald, M.D., Professor and Chair, Department of Physical Medicine & Rehabilitation, University of California Davis. “ I have been closely following the progress of EDG-5506 in the clinic and am excited by the 12-month results and EDG-5506’s potential as a novel therapy for individuals with Becker. ” ARCH Data Review Virtual Investor Event Members of the Edgewise management team will hold a live webcast on Tuesday, June 27, at 8:30 a.m. ET to discuss the ARCH 12-month data, and will be joined by Dr. Craig McDonald, who will share his perspective of EDG-5506 and BMD. An accompanying slide presentation will also be available. To register for the live webcast and replay, please visit the Edgewise events page . Further, Edgewise plans to discuss these data at the Parent Project Muscular Dystrophy Annual Conference, June 29 – July 1, 2023. Edgewise Therapeutics Presentations at Parent Project Muscular Dystrophy Conference Edgewise Therapeutics’ Chief Medical Officer, Joanne Donovan, M.D., Ph.D., will present at the Parent Project Muscular Dystrophy Annual Conference on July 29, during the “Emerging Therapies in Becker” session at 5:00 pm CT / 6:00 pm ET and on June 30, during the “Research Row: Impacting Downstream” session at 10:45 am CT / 11:45 am ET. Only registered conference attendees can attend the presentations. The Impacting Downstream session will be streamed to the virtual element of the event and both will be available for replay via the conference platform. The Edgewise presentations will be available on the Edgewise website when they are presented. About the ARCH Open-Label Study The ARCH open-label study is evaluating EDG-5506 in 12 adult males with BMD. The study is evaluating varying doses of EDG-5506 administered daily over 24 months. Safety, PK, changes in biomarkers of muscle damage such as CK and fast skeletal muscle troponin I, measures of function with NSAA and NSAD, time function tests and patient-reported outcomes are being evaluated. Go to clinicaltrials.gov to learn more about this study ( NCT05160415 ). About the CANYON Clinical Trial The CANYON clinical trial is evaluating EDG-5506 in individuals with BMD. CANYON is assessing the effect of EDG-5506 over a 12-month period on safety, PK, biomarkers of muscle damage, such as CK and fast skeletal muscle troponin I, fat fraction as measured by muscle MRI and function in individuals with BMD aged 12 to 50 years. This placebo-controlled trial is anticipated to recruit approximately 32 adults and 18 adolescents at up to 14 sites in the United States, United Kingdom and the Netherlands. The GRAND CANYON cohort has been designed as a potentially registrational cohort with NSAA as the primary endpoint. GRAND CANYON will be a global placebo-controlled study and is anticipated to recruit approximately 120 BMD patients who will receive study drug for 18 months. Go to clinicaltrials.gov to learn more about this trial ( NCT05291091 ). About Becker Muscular Dystrophy BMD is a genetic, progressively debilitating, and potentially fatal inherited X-linked neuromuscular disorder. BMD results from mutation of the dystrophin gene yielding unstable and/or dysfunctional dystrophin expression in muscles. Individuals with BMD, typically males, have ongoing muscle fiber (myofiber) degeneration that eventually leads to fibrosis, progressive loss of skeletal muscle function, and that can lead to severe disability and early death. BMD typically presents with juvenile onset of muscle wasting and progressive symmetrical, proximal muscle weakness, calf hypertrophy, activity-induced muscle cramping and elevated CK activity. While the course of BMD is variable, it is unidirectional in terms of the inevitable progressive limb weakness resulting in severe disability. BMD is also associated with early mortality from cardiac disease. The incidence of BMD is approximately 1 in every 18,450 live male births. It is estimated that there are approximately 5,000 individuals with BMD in the U.S., with similar numbers of individuals living with BMD in the EU and UK. Despite the seriousness of the disease, for many with BMD, the disease remains one of considerable unmet medical need as there are no approved therapies. About EDG-5506 EDG-5506 is an orally administered small molecule designed to prevent contraction-induced muscle damage in dystrophinopathies including DMD and BMD. EDG-5506 presents a novel mechanism of action designed to selectively limit the exaggerated muscle damage caused by the absence or loss of functional dystrophin. By minimizing the progressive muscle damage that leads to functional impairment, EDG-5506 has the potential to benefit a broad range of patients suffering from debilitating rare neuromuscular disorders. It is anticipated to be used as a single agent therapy, but it may also provide an additional benefit in combination with available therapies and therapies currently in development. In August 2021, the U.S. Food and Drug Administration (FDA) granted Fast Track designation to EDG-5506 for the treatment of individuals with BMD. The Company has completed a Phase 1 clinical trial of EDG-5506 designed to evaluate safety, tolerability, PK and pharmacodynamics of EDG-5506 in adult healthy volunteers (Phase 1a) and in adults with BMD (Phase 1b) ( NCT04585464 ). In ARCH, an open-label, single-center trial ( NCT05160415 ) assessing long-term safety and PK, decreases in biomarkers of muscle damage and trends toward improvement in NSAA have been observed following 12 months of treatment with EDG-5506. CANYON, an ongoing Phase 2 trial ( NCT05291091 ), is assessing safety, PK, biomarkers of muscle damage, fat fraction as measured by muscle MRI and function in participants with BMD aged 12 to 50 years. CANYON now also includes the GRAND CANYON cohort, designed as a potentially registrational cohort with NSAA as the primary endpoint. LYNX, an ongoing Phase 2 trial ( NCT05540860 ), is assessing safety, PK and biomarkers of muscle damage in participants with DMD. The Company is also continuing to recruit the DUNE Phase 2 exercise challenge study, to evaluate the effect of EDG-5506 on biomarkers of muscle damage following exercise in adults with Limb Girdle muscular dystrophy 2i (LGMD2i), BMD or McArdle disease at a single site in Denmark. About Edgewise Therapeutics Edgewise Therapeutics is a clinical-stage biopharmaceutical company focused on the discovery, development, and commercialization of innovative treatments for severe, rare neuromuscular and cardiac disorders for which there is significant unmet medical need. Guided by its holistic drug discovery approach to targeting the muscle as an organ, Edgewise has combined its foundational expertise in muscle biology and small molecule engineering to build its proprietary, muscle-focused drug discovery platform. Edgewise’s platform utilizes custom-built high throughput and translatable systems that measure integrated muscle function in whole organ extracts to identify small molecule precision medicines regulating key proteins in muscle tissue. The Company’s lead candidate, EDG-5506, an investigational orally administered small molecule designed to protect injury-susceptible fast skeletal muscle fibers in dystrophinopathies, is advancing in multiple clinical trials in individuals with Duchenne, Becker and Limb Girdle 2I/R9 muscular dystrophies, and McArdle disease. The Company is also advancing EDG-7500, a novel sarcomere modulator for hypertrophic cardiomyopathy, through IND-enabling preclinical development. To learn more, go to: www.edgewisetx.com or follow us on LinkedIn , Twitter and Facebook . References [1] Bello L, et al. , Functional Changes in Becker Muscular Dystrophy: Implications for Clinical Trials in Dystrophinopathies, Scientific Reports , 2016. [2] van de Velde et al. , Selection Approach to Identify the Optimal Biomarker Using Quantitative Muscle MRI and Functional Assessments in Becker Muscular Dystrophy, Neurology , 2021. SOURCE: Edgewise Therapeutics