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Lead Candidate, EPX-100, Holds Orphan Drug and Rare Pediatric Disease Designations EPX-100 in Pivotal Registrational Trial for Dravet Syndrome; Topline Data Expected in 2026 Plan to Initiate Phase 3 Trial for Lennox-Gastaut Syndrome in Second Half of 2024 Potential Billion Dollar Plus Market Opportunity in Rare Epilepsy PLYMOUTH MEETING, Pa., April 30, 2024 /PRNewswire/ -- Harmony Biosciences (Nasdaq: HRMY), today announced the acquisition of Epygenix Therapeutics, Inc., accelerating its growth strategy by adding a rare epilepsy franchise to its expanding late-stage pipeline of innovative CNS assets. "The acquisition of Epygenix gives us three distinct CNS franchises in late-stage development, each with a potential US peak sales opportunity of $1B - $2B," said Jeffrey M. Dayno, M.D., President and Chief Executive Officer at Harmony Biosciences. "We have been strategically building a robust and diverse pipeline of innovative CNS assets for rare diseases that has transformed our business. This acquisition builds on our leadership position in sleep/wake and our franchise in neurobehavioral disorders, allowing us to leverage our expertise in CNS and internal synergies to deliver new therapies to patients with unmet medical needs." "Harmony shares our team's core values, including a commitment to patients and families living with Dravet syndrome and Lennox-Gastaut syndrome, where a significant unmet need for effective therapies remains," said Alex Yang, Chair and CEO of Epygenix Therapeutics. "Harmony's demonstrated expertise in drug development and commercialization will accelerate the full potential of these treatments and make a real difference in the lives of Dravet and LGS families." The acquisition includes clemizole hydrochloride (EPX-100), a potent, oral, centrally acting serotonin (5HT2) agonist. It is currently in a pivotal registrational clinical trial for the treatment of Dravet syndrome in children and adults and is poised to enter Phase 3 for the treatment of Lennox-Gastaut syndrome. The proven mechanism of action of clemizole could potentially offer an improved product profile over currently available treatment options and improve daily functioning in patients living with Dravet syndrome and Lennox-Gastaut syndrome. EPX-100 has received Orphan Drug Designation (ODD) and Rare Pediatric Disease Designation (RPDD) from the FDA for both Dravet syndrome and Lennox-Gastaut syndrome. A second investigational product, EPX-200, is a potent, oral, centrally active and selective 5HT2C agonist, and is currently in IND-enabling studies. EPX-200 also received ODD from FDA for Dravet syndrome and Lennox-Gastaut syndrome as well as RPDD for Lennox-Gastaut syndrome. Under the terms of the definitive agreement, Harmony paid $35 million in cash with the potential for payments of up to $130 million based on development and regulatory milestones. In addition, there are potential payments of up to $515 million if certain sales milestones are achieved. About Clemizole hydrochloride (EPX-100) EPX-100, clemizole hydrochloride, is under development for the treatment of Dravet syndrome (DS) and Lennox-Gastaut syndrome (LGS). EPX-100 acts by targeting central 5-hydroxytryptamine receptors to modulate serotonin signaling. The drug candidate is administered orally twice a day in a liquid formulation and has been developed based on a proprietary phenotype-based zebrafish drug screening platform.1 DS is caused by a loss of function mutation in the SCN1A gene, and scn1 mutant zebrafish replicate the genetic etiology and phenotype observed in the majority of DS patients. The scn1Lab mutant zebrafish model that expresses voltage gated sodium channels has been used for high-throughput screening of compounds that modulate Nav1.1 in the central nervous system. About Dravet syndrome Dravet syndrome (DS) is a severe and progressive epileptic encephalopathy that begins in infancy and causes significant impact on patient functioning. DS begins in the first year of life and is characterized by high seizure frequency and severity, intellectual disability, and a risk of sudden unexpected death in epilepsy.1 Approximately 85% of Dravet syndrome cases are caused by de novo loss-of-function (LOF) mutations in a voltage-gated sodium channel gene, SCN1A1.2 DS has an estimated incidence rate of 1:15,7003. About Lennox-Gastaut syndrome Lennox-Gastaut syndrome (LGS) is a rare and drug-resistant epileptic encephalopathy characterized by onset in children between 3-5 years of age. The underlying cause of LGS is unknown and can be related to a wide range of factors including genetic differences and structural differences in the brain.2,4 As a result, patients experience multiple seizure types, including atonic seizures, and developmental, cognitive, and behavioral issues.3 LGS affects approximately 48,000 patients in the U.S5. About Harmony Biosciences At Harmony Biosciences, we specialize in developing and delivering treatments for rare neurological diseases that others often overlook. We believe that where empathy and innovation meet, a better life can begin for people living with neurological diseases. Established by Paragon Biosciences, LLC, in 2017 and headquartered in Plymouth Meeting, PA, our team of experts from a wide variety of disciplines and experiences is driven by our shared conviction that innovative science translates into therapeutic possibilities for our patients, who are at the heart of everything we do. For more information, please visit . About Epygenix Therapeutics, Inc. Epygenix Therapeutics, Inc. is a precision medicine-based biopharmaceutical company focused on genetically screening, discovering, and developing drugs to treat rare and intractable forms of genetic epilepsy in childhood, such as Dravet syndrome (DS). Epygenix is currently focused on developing EPX-100 and EPX-200, drug candidates that were discovered in a zebrafish model of DS which replicates the genetic mutation that causes DS and mimics the human pathology. This mechanism of action has been shown to eliminate both clinical and electrographic seizure activity which could translate into improved patient functioning. Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including statements regarding our product WAKIX and our future capabilities following the acquisition of Epygenix, including clemizole hydrochloride. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to, the following: our commercialization efforts and strategy for WAKIX and our other product candidates, including clemizole hydrochloride; the rate and degree of market acceptance and clinical utility of WAKIX, pitolisant in additional indications, if approved, and any other product candidates, including clemizole hydrochloride, we may develop or acquire, if approved; our research and development plans, including our development activities with Bioprojet, and plans to explore the therapeutic potential of pitolisant in additional indications; our ongoing and planned clinical trials; the availability of favorable insurance coverage and reimbursement for WAKIX and our other product candidates, including clemizole hydrochloride; the timing of and our ability to obtain regulatory approvals for pitolisant for other indications as well as any of our product candidates, including those we are developing with Bioprojet and those that we have acquired; our failure to achieve the potential benefits of the 2022 LCA with Bioprojet; our ability to recognize the intended benefits of our acquisition of Zynerba Pharmaceuticals, Epygenix and another entity or assets that we acquire; our estimates regarding expenses, future revenue, capital requirements and needs for additional financing; our ability to identify additional products or product candidates with significant commercial potential that are consistent with our commercial objectives; our commercialization, marketing and manufacturing capabilities and strategy; significant competition in our industry; our intellectual property position; loss or retirement of key members of management; failure to successfully execute our growth strategy, including any delays in our planned future growth; our failure to maintain effective internal controls; the impact of government laws and regulations; volatility and fluctuations in the price of our common stock; the significant costs and required management time as a result of operating as a public company; the fact that the price of Harmony's common stock may be volatile and fluctuate substantially; statements related to our intended share repurchases and repurchase timeframe and the significant costs and required management time as a result of operating as a public company. These and other important factors discussed under the caption "Risk Factors" in our Annual Report on Form 10-K, as amended, filed with the Securities and Exchange Commission (the "SEC") on February 22, 2024, and our other filings with the SEC could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management's estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. Harmony Biosciences Investor Contact: Luis Sanay, CFA 445-235-8386 [email protected] Harmony Biosciences Media Contact: Cate McCanless 202-641-6086 [email protected] 1 EpyGenix Company Presentation: 2 EpyGenix Poster: 3 Wu, E., et. al. (2015). Incidence of Dravet Syndrome in a US Population. Pediatrics 136(5): 1310-e1315. doi: 10.1542/peds.2015-1807. 4 5 SOURCE Harmony Biosciences

WAKIX® (pitolisant) Net Revenue of $154.6 Million for First Quarter 2024; ~30% Growth Year-over-Year Supplemental New Drug Application for Pitolisant in Idiopathic Hypersomnia Planned for Second Half 2024 On Track Toward Pediatric Exclusivity to Extend WAKIX Exclusivity to September 2030: Pediatric Narcolepsy sNDA PDUFA Date of June 21, 2024; PWS Phase 3 TEMPO Study Initiated in March 2024 Pitolisant Franchise Revenue Potential Extended Beyond 2040 With Next-Generation Formulations; Reports Positive Pharmacokinetic Data on Next-Generation Formulation 1 (NG1); PDUFA Expected in 2026 Strengthens Leadership Position in Sleep/Wake with Licensing of TPM-1116, a Highly Potent and Selective Oral Orexin-2 Receptor Agonist Establishes Potential Billion Dollar Plus Rare Epilepsy Franchise Through Acquisition of Epygenix Therapeutics, Inc. Reiterates 2024 Net Product Revenue Guidance of $700 - $720 Million Conference Call and Webcast to be Held Today at 8:30 a.m. ET PLYMOUTH MEETING, Pa., April 30, 2024 (GLOBE NEWSWIRE) -- Harmony Biosciences Holdings, Inc. (Nasdaq: HRMY), today reported year-over-year net revenue growth of 30 percent for the quarter ended March 31, 2024 and accelerated its growth strategy with the addition of a rare epilepsy franchise to its expanding pipeline of innovative, late-stage CNS assets. "We believe Harmony is well-positioned to become the leading patient-focused CNS biotechnology company delivering innovative treatments to patients living with unmet medical needs. We have transformed our business by executing a best-in-class launch of WAKIX in narcolepsy, advancing our pipeline through life cycle management and new indications, and diversifying our portfolio through strategic business development, having closed three transactions over the past eight months,” said Jeffrey M. Dayno, M.D., President and Chief Executive Officer of Harmony. “We now have three late-stage orphan/rare CNS franchises, each with potential peak sales opportunities of $1B to $2B, comprised of eight assets advancing across thirteen development programs. We expect our pipeline to deliver at least one new product or indication launch every year over the next five years, with multi-billion-dollar revenue potential extending beyond 2040. In addition, the durable commercial success of WAKIX is currently paving the way to surpassing $1 billion in the adult narcolepsy market alone.” Key Franchise Highlights: Sleep/Wake WAKIX Net Revenue of $154.6 million in the first quarter of 2024, representing 30% growth over the same period in 2023. The average number of patients on WAKIX increased by approximately 150 patients sequentially to approximately 6,300 for the quarter ended March 31, 2024. Following a March 2024 meeting with FDA, we are moving forward with the Idiopathic Hypersomnia (IH) program and plan to submit a supplemental new drug application (sNDA) for pitolisant in IH in the second half of 2024. Reported positive pharmacokinetic (PK) data on Next-Gen pitolisant-based formulation 1 (NG1). Pivotal bioequivalence and dosing optimization studies will be initiated in the fourth quarter of 2024. PDUFA date expected in 2026. Provisional patent filed with the potential for patent protection out to 2044. On track to receive PK data on Next-Gen pitolisant-based formulation 2 (NG2) in the first half of 2024. Pediatric narcolepsy sNDA on track for PDUFA date of June 21, 2024. Initiated the Phase 3 TEMPO study in patients with Prader-Willi syndrome (PWS) in March 2024. On track towards gaining pediatric exclusivity to extend WAKIX exclusivity to September 2030 based on progress in the pediatric narcolepsy submission and advancement of the PWS Phase 3 TEMPO study. Strengthened our leadership position, and created opportunity for long-term revenue generation, in sleep medicine with an exclusive licensing agreement with Bioprojet to develop, manufacture and commercialize TPM-1116, a highly potent and selective oral orexin-2 receptor agonist that will be evaluated for the treatment of narcolepsy and other sleep-wake disorders. Expect to by mid-2025 and initiate first-in-human studies in the second half of 2025. Neurobehavioral On track to complete patient enrollment in the Phase 3 pivotal RECONNECT trial for Fragile X syndrome (FXS) in the first quarter of 2025 with topline data expected in mid-2025; IP protection for ZYN002 in FXS out to 2040. Phase 3 preparation ongoing for ZYN002 in 22q11.2 deletion syndrome (22q). Rare Epilepsy Acquired Epygenix Therapeutics, Inc., and establishes rare epilepsy franchise. Lead product, clemizole hydrochloride (EPX-100), is a potent, oral, centrally acting serotonin (5HT2) agonist, currently in a pivotal registrational trial for Dravet syndrome (DS) with topline data expected in 2026. Phase 3 trial for Lennox-Gastaut syndrome (LGS) expected to initiate in the second half of 2024. Proven mechanism of action with potential for improved benefit/risk pro to current treatment options. EPX-100 has been granted Orphan Drug Designation (ODD) and Rare Pediatric Disease Designation (RPDD) for both DS and LGS by FDA. IP protection for EPX-100 out to 2034. A second investigational product, EPX-200, is a potent, oral, centrally acting and selective 5HT2C agonist, and is currently in IND-enabling studies. EPX-200 also received ODD from FDA for DS and LGS as well as RPDD for LGS. First Quarter 2024 Financial Results Net product revenue for the quarter ended March 31, 2024, was $154.6 million, compared to $119.1 million for the same period in 2023. The 30% growth versus the same period in 2023 is primarily attributed to strong commercial sales of WAKIX driven by continued organic demand tapping into a large market opportunity (approximately 80,000 patients diagnosed with narcolepsy in the US). The average number of patients on WAKIX increased by approximately 150 patients sequentially to approximately 6,300 for the quarter ended March 31, 2024. GAAP net income for the quarter ended March 31, 2024, was $38.3 million, or $0.67 per diluted share, compared to GAAP net income of $29.5 million, or $0.48 per diluted share, for the same period in 2023. Non-GAAP adjusted net income was $50.7 million, or $0.88 per diluted share, for the quarter ended March 31, 2024, compared to Non-GAAP adjusted net income of $40.1 million, or $0.66 per diluted share, for the same period in 2023. Reconciliations of applicable GAAP financial measures to Non-GAAP financial measures are included at the end of this press release. Harmony’s operating expenses include the following: Research and Development expenses were $22.2 million in the first quarter of 2024, as compared to $13.3 million for the same quarter in 2023, representing a 67% increase; Sales and Marketing expenses were $27.2 million in the first quarter of 2024, as compared to $22.6 million for the same quarter in 2023, representing a 21% increase; General and Administrative expenses were $25.7 million in the first quarter of 2024, as compared to $22.1 million for the same quarter in 2023, representing a 16% increase; and Total Operating Expenses were $75.1 million in the first quarter of 2024, as compared to $57.9 million for the same quarter in 2023, representing a 30% increase. As of March 31, 2024, Harmony had cash, cash equivalents and investments of $453.6 million, compared to $425.6 million as of December 31, 2023. Reiterates 2024 Net Product Revenue Guidance Expect full year 2024 net product revenue of $700 million to $720 million. Share Repurchase Program The remaining amount of common stock authorized for repurchases as of March 31, 2024, was $150 million. Conference Call Today at 8:30 a.m. ET We are hosting our first quarter 2024 financial results conference call and webcast today at 8:30 a.m. Eastern Time. The live and replay webcast of the call will be available on the investor relations page of our website at . To participate in the live call by phone, dial (800) 579-2543 (domestic) or +1 (785) 424- 1789 (international), and reference passcode HRMYQ124. Non-GAAP Financial Measures In addition to our GAAP results, we present certain Non-GAAP metrics including Non-GAAP adjusted net income and Non-GAAP adjusted net income per share, which we believe provides important supplemental information to management and investors regarding our performance. These measurements are not a substitute for GAAP measurements, and the manner in which we calculate Non-GAAP adjusted net income and Non-GAAP adjusted net income per share may not be identical to the manner in which other companies calculate adjusted net income and adjusted net income per share. We use these Non-GAAP measurements as an aid in monitoring our financial performance from quarter-to-quarter and year-to-year and for benchmarking against comparable companies. Non-GAAP financial measures should not be considered in isolation or as a substitute for comparable GAAP measures; should be read in conjunction with our consolidated financial statements prepared in accordance with GAAP; have no standardized meaning prescribed by GAAP; and are not prepared under any comprehensive set of accounting rules or principles. In addition, from time to time in the future there may be other items that we may exclude for purposes of our Non-GAAP financial measures; and we may in the future cease to exclude items that we have historically excluded for purposes of our Non-GAAP financial measures. About WAKIX® (pitolisant) Tablets WAKIX, a first-in-class medication, is approved by the U.S. Food and Drug Administration for the treatment of excessive daytime sleepiness or cataplexy in adult patients with narcolepsy and has been commercially available in the U.S. since Q4 2019. It was granted orphan drug designation for the treatment of narcolepsy in 2010, and breakthrough therapy designation for the treatment of cataplexy in 2018. WAKIX is a selective histamine 3 (H₃) receptor antagonist/inverse agonist. The mechanism of action of WAKIX is unclear; however, its efficacy could be mediated through its activity at H₃ receptors, thereby increasing the synthesis and release of histamine, a wake promoting neurotransmitter. WAKIX was designed and developed by Bioprojet (France). Harmony has an exclusive license from Bioprojet to develop, manufacture and commercialize pitolisant in the United States. Indications and Usage WAKIX is indicated for the treatment of excessive daytime sleepiness or cataplexy in adult patients with narcolepsy. Important Safety Information Contraindications WAKIX is contraindicated in patients with known hypersensitivity to pitolisant or any component of the formulation. Anaphylaxis has been reported. WAKIX is also contraindicated in patients with severe hepatic impairment. Warnings and Precautions WAKIX prolongs the QT interval; avoid use of WAKIX in patients with known QT prolongation or in combination with other drugs known to prolong the QT interval. Avoid use in patients with a history of cardiac arrhythmias, as well as other circumstances that may increase the risk of the occurrence of torsade de pointes or sudden death, including symptomatic bradycardia, hypokalemia or hypomagnesemia, and the presence of congenital prolongation of the QT interval. The risk of QT prolongation may be greater in patients with hepatic or renal impairment due to higher concentrations of pitolisant; monitor these patients for increased QTc. Dosage modification is recommended in patients with moderate hepatic impairment and moderate or severe renal impairment (see full prescribing information). WAKIX is not recommended in patients with end-stage renal disease (ESRD). Adverse Reactions In the placebo-controlled clinical trials conducted in patients with narcolepsy with or without cataplexy, the most common adverse reactions (≥5% and twice placebo) for WAKIX were insomnia (6%), nausea (6%), and anxiety (5%). Other adverse reactions that occurred at ≥2% and more frequently than in patients treated with placebo included headache, upper respiratory infection, musculoskeletal pain, heart rate increased, hallucinations, irritability, abdominal pain, sleep disturbance, decreased appetite, cataplexy, dry mouth, and rash. Drug Interactions Concomitant administration of WAKIX with strong CYP2D6 inhibitors increases pitolisant exposure by 2.2-fold. Reduce the dose of WAKIX by half. Concomitant use of WAKIX with strong CYP3A4 inducers decreases exposure of pitolisant by 50%. Dosage adjustments may be required (see full prescribing information). H1 receptor antagonists that cross the blood-brain barrier may reduce the effectiveness of WAKIX. Patients should avoid centrally acting H1 receptor antagonists. WAKIX is a borderline/weak inducer of CYP3A4. Therefore, reduced effectiveness of sensitive CYP3A4 substrates may occur when used concomitantly with WAKIX. The effectiveness of hormonal contraceptives may be reduced when used with WAKIX and effectiveness may be reduced for 21 days after discontinuation of therapy. Use in Specific Populations WAKIX may reduce the effectiveness of hormonal contraceptives. Patients using hormonal contraception should be advised to use an alternative non-hormonal contraceptive method during treatment with WAKIX and for at least 21 days after discontinuing treatment. There is a pregnancy exposure registry that monitors pregnancy outcomes in women who are exposed to WAKIX during pregnancy. Patients should be encouraged to enroll in the WAKIX pregnancy registry if they become pregnant. To enroll or obtain information from the registry, patients can call 1-800-833-7460. The safety and effectiveness of WAKIX have not been established in patients less than 18 years of age. WAKIX is extensively metabolized by the liver. WAKIX is contraindicated in patients with severe hepatic impairment. Dosage adjustment is required in patients with moderate hepatic impairment. WAKIX is not recommended in patients with end-stage renal disease. Dosage adjustment of WAKIX is recommended in patients with moderate or severe renal impairment. Dosage reduction is recommended in patients known to be poor CYP2D6 metabolizers; these patients have higher concentrations of WAKIX than normal CYP2D6 metabolizers. Please see the Full Prescribing Information for WAKIX for more information. To report suspected adverse reactions, contact Harmony Biosciences at 1-800-833-7460 or the FDA at 1-800-FDA-1088 or . About Narcolepsy Narcolepsy is a rare, chronic, debilitating neurological disease of sleep-wake state instability that impacts approximately 170,000 Americans and is primarily characterized by excessive daytime sleepiness (EDS) and cataplexy – its two cardinal symptoms – along with other manifestations of REM sleep dysregulation (hallucinations and sleep paralysis), which intrude into wakefulness. EDS is the inability to stay awake and alert during the day and is the symptom that is present in all people living with narcolepsy. In most patients, narcolepsy is caused by the loss of hypocretin/orexin, a neuropeptide in the brain that supports sleep-wake state stability. This disease affects men and women equally, with typical symptom onset in adolescence or young adulthood; however, it can take up to a decade to be properly diagnosed. About Idiopathic Hypersomnia Idiopathic Hypersomnia (IH) is a rare and chronic neurological disease that is characterized by excessive daytime sleepiness (EDS) despite sufficient or even long sleep time. EDS in IH cannot be alleviated by naps, longer sleep or more efficient sleep. People living with IH experience significant EDS along with the symptoms of sleep inertia (prolonged difficulty waking up from sleep) and 'brain fog' (impaired cognition, attention, and alertness). The cause of IH is unknown, but it is likely due to alterations in areas of the brain that stabilize states of sleep and wakefulness. IH is one of the central disorders of hypersomnolence and, like narcolepsy, is a debilitating sleep disorder that can result in significant disruption in daily functioning. About Prader-Willi Syndrome PWS is an orphan/rare, genetic neurological disorder with many of the symptoms resulting from hypothalamic dysfunction. The hypothalamus is the part of the brain that controls both sleep-wake state stability and signals that mediate the balance between hunger and satiety, resulting in two of the main symptoms in patients with PWS; EDS and hyperphagia (an intense persistent sensation of hunger accompanied by food preoccupations, an extreme drive to consume food, food-related behavior problems, and a lack of normal satiety). Other features include low muscle tone, short stature, behavioral problems, and cognitive impairment. Approximately 15,000 to 20,000 people in the U.S. live with PWS, and over half of them experience EDS and the majority of them have behavioral disturbances. About ZYN002 ZYN002 is the first-and-only pharmaceutically manufactured synthetic cannabidiol devoid of THC and formulated as a patent-protected permeation-enhanced gel for transdermal delivery through the skin and into the circulatory system. The product is manufactured through a synthetic process in a cGMP facility and is not extracted from the cannabis plant. ZYN002 does not contain THC, the compound that causes the euphoric effect of cannabis, and has the potential to be a nonscheduled product if approved. Cannabidiol, the active ingredient in ZYN002, has been granted orphan drug designation by the United States Food and Drug Administration (FDA) and the European Medicines Agency (EMA) for the treatment of FXS and for the treatment of 22q. Additionally, ZYN002 has received FDA Fast Track designation for the treatment of behavioral symptoms in patients with FXS. About Fragile X Syndrome Fragile X syndrome (FXS) is a rare genetic disorder that is the leading known cause of both inherited intellectual disability and autism spectrum disorder. The disorder negatively affects synaptic function, plasticity and neuronal connections, and results in a spectrum of intellectual disabilities and behavioral symptoms, such as social avoidance and irritability. While the exact prevalence is unknown, upwards of 80,000 patients in the U.S. and 121,000 patients in the European Union and the UK are believed to have FXS, based on FXS prevalence estimates of approximately 1 in 4,000 to 7,000 in males and approximately 1 in 8,000 to 11,000 in females. There is a significant unmet medical need in patients living with FXS as there are currently no FDA approved treatments for this disorder. FXS is caused by a mutation in FMR1, a gene which modulates a number of systems, including the endocannabinoid system, and most critically, codes for a protein called FMRP. The FMR1 mutation manifests as multiple repeats of a DNA segment, known as the CGG triplet repeat, resulting in deficiency or lack of FMRP. FMRP helps regulate the production of other proteins and plays a role in the development of synapses, which are critical for relaying nerve impulses, and in regulating synaptic plasticity. In people with full mutation of the FMR1 gene, the CGG segment is repeated more than 200 times, and in most cases causes the gene to not function. Methylation of the FMR1 gene also plays a role in determining functionality of the gene. In approximately 60% of patients with FXS, who have complete methylation of the FMR1 gene, no FMRP is produced, resulting in dysregulation of the systems modulated by FMRP. About 22q11.2 Deletion Syndrome 22q11.2 deletion syndrome (22q) is a disorder caused by a small missing piece of the 22nd chromosome. The deletion occurs near the middle of the chromosome at a location designated q11.2. It is considered a mid-line condition, with physical symptoms including characteristic palate abnormalities, heart defects, immune dysfunction, and esophageal/ GI issues, as well as debilitating neuropsychiatric and behavioral symptoms, including anxiety, social withdrawal, ADHD, cognitive impairment and autism spectrum disorder. It is estimated that 22q occurs in one in 4,000 live births, suggesting that there are approximately 80,000 people living with 22q in the U.S. and 129,000 in the European Union and the UK. Patients with 22q deletion syndrome are managed by multidisciplinary care providers, and there are currently no FDA approved treatments for this disorder. About Clemizole hydrochloride (EPX-100) EPX-100, clemizole hydrochloride, is under development for the treatment of Dravet syndrome (DS) and Lennox-Gastaut syndrome (LGS). EPX-100 acts by targeting central 5-hydroxytryptamine receptors to modulate serotonin signaling. The drug candidate is administered orally twice a day in a liquid formulation and has been developed based on a proprietary phenotype-based zebrafish drug screening platform.1 DS is caused by a loss of function mutation in the SCN1A gene, and scn1 mutant zebrafish replicate the genetic etiology and phenotype observed in the majority of DS patients. The scn1Lab mutant zebrafish model that expresses voltage gated sodium channels has been used for high-throughput screening of compounds that modulate Nav1.1 in the central nervous system. About Dravet Syndrome Dravet syndrome (DS) is a severe and progressive epileptic encephalopathy that begins in infancy and causes significant impact on patient functioning. DS begins in the first year of life and is characterized by high seizure frequency and severity, intellectual disability, and a risk of sudden unexpected death in epilepsy.1 Approximately 85% of Dravet Syndrome cases are caused by de novo loss-of-function (LOF) mutations in a voltage-gated sodium channel gene, SCN1A1.2 DS has an estimated incidence rate of 1:15,700.3 About Lennox-Gastaut Syndrome Lennox-Gastaut Syndrome (LGS) is a rare and drug-resistant epileptic encephalopathy characterized by onset in children between 3-5 years of age. The underlying cause of LGS is unknown and can be related to a wide range of factors including genetic differences and structural differences in the brain.2,4 As a result, patients experience multiple seizure types, including atonic seizures, and developmental, cognitive, and behavioral issues.3 LGS affects approximately 48,000 patients in the U.S. 5 (1) EpyGenix Company Presentation: (2) EpyGenixPoster: (3) Wu, E., et. al. (2015). Incidence of Dravet Syndrome in a US Population. Pediatrics 136(5): 1310-e1315. doi: 10.1542/peds.2015-1807. (4) (5) About Harmony Biosciences At Harmony Biosciences, we specialize in developing and delivering treatments for rare neurological diseases that others often overlook. We believe that where empathy and innovation meet, a better life can begin for people living with neurological diseases. Established by Paragon Biosciences, LLC, in 2017 and headquartered in Plymouth Meeting, PA, our team of experts from a wide variety of disciplines and experiences is driven by our shared conviction that innovative science translates into therapeutic possibilities for our patients, who are at the heart of everything we do. For more information, please visit . Forward-Looking Statements This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this press release that do not relate to matters of historical fact should be considered forward-looking statements, including statements regarding our full year 2024 net product revenue, expectations for the growth and value of WAKIX, plans to submit an sNDA for pitolisant in idiopathic hypersomnia; our future results of operations and financial position, business strategy, products, prospective products, product approvals, the plans and objectives of management for future operations and future results of anticipated products. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to, the following: our commercialization efforts and strategy for WAKIX; the rate and degree of market acceptance and clinical utility of pitolisant in additional indications, if approved, and any other product candidates we may develop or acquire, if approved; our research and development plans, including our plans to explore the therapeutic potential of pitolisant in additional indications; our ongoing and planned clinical trials; our ability to expand the scope of our license agreements with Bioprojet Société Civile de Recherche (“Bioprojet”); the availability of favorable insurance coverage and reimbursement for WAKIX; the timing of, and our ability to obtain, regulatory approvals for pitolisant for other indications as well as any other product candidates; our estimates regarding expenses, future revenue, capital requirements and additional financing needs; our ability to identify, acquire and integrate additional products or product candidates with significant commercial potential that are consistent with our commercial objectives; our commercialization, marketing and manufacturing capabilities and strategy; significant competition in our industry; our intellectual property position; loss or retirement of key members of management; failure to successfully execute our growth strategy, including any delays in our planned future growth; our failure to maintain effective internal controls; the impact of government laws and regulations; volatility and fluctuations in the price of our common stock; the significant costs and required management time as a result of operating as a public company; the fact that the price of Harmony's common stock may be volatile and fluctuate substantially; statements related to our intended share repurchases and repurchase timeframe and the significant costs and required management time as a result of operating as a public company. These and other important factors discussed under the caption "Risk Factors" in our Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on February 22, 2024, and our other filings with the SEC could cause actual results to differ materially from those indicated by the forward-looking statements made in this press release. Any such forward-looking statements represent management's estimates as of the date of this press release. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. HARMONY BIOSCIENCES HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (In thousands, except share and per share data) Three Months Ended March 31, March 31, 2024 2023 Net product revenue $ 154,615 $ 119,126 Cost of product sold 27,484 20,780 Gross profit 127,131 98,346 Operating expenses: Research and development 22,189 13,289 Sales and marketing 27,233 22,572 General and administrative 25,676 22,062 Total operating expenses 75,098 57,923 Operating income 52,033 40,423 Other expense (income), net (141 ) 2 Interest expense (4,535 ) (5,731 ) Interest income 4,428 3,086 Income before income taxes 51,785 37,780 Income tax benefit (expense) (13,451 ) (8,295 ) Net income $ 38,334 $ 29,485 EARNINGS PER SHARE: Basic $ 0.68 $ 0.49 Diluted $ 0.67 $ 0.48 Weighted average number of shares of common stock - basic 56,771,251 59,732,157 Weighted average number of shares of common stock - diluted 57,597,627 61,221,511 HARMONY BIOSCIENCES HOLDINGS, INC. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (In thousands, except share and per share data) March 31, December 31, 2024 2023 ASSETS CURRENT ASSETS: Cash and cash equivalents 332,981 $ 311,660 Investments, short-term 39,369 41,800 Trade receivables, net 79,719 74,140 Inventory, net 5,857 5,363 Prepaid expenses 12,894 12,570 Other current assets 8,683 5,537 Total current assets 479,503 451,070 NONCURRENT ASSETS: Property and equipment, net 213 371 Restricted cash 270 270 Investments, long-term 81,244 72,169 Intangible assets, net 131,147 137,108 Deferred tax asset 147,639 144,162 Other noncurrent assets 6,969 6,298 Total noncurrent assets 367,482 360,378 TOTAL ASSETS 846,985 $ 811,448 LIABILITIES AND STOCKHOLDERS’ EQUITY CURRENT LIABILITIES: Trade payables 15,144 $ 17,730 Accrued compensation 7,317 23,747 Accrued expenses 91,699 99,494 Current portion of long-term debt 15,000 15,000 Other current liabilities 25,093 7,810 Total current liabilities 154,253 163,781 NONCURRENT LIABILITIES: Long-term debt, net 174,996 178,566 Other noncurrent liabilities 2,342 2,109 Total noncurrent liabilities 177,338 180,675 TOTAL LIABILITIES 331,591 344,456 COMMITMENTS AND CONTINGENCIES (Note 13) STOCKHOLDERS’ EQUITY: Common stock—$0.00001 par value; 500,000,000 shares authorized at March 31, 2024 and December 31, 2023, respectively; 56,791,214 and 56,769,081 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively 1 1 Additional paid in capital 620,507 610,266 Accumulated other comprehensive (loss) income (171 ) 2 Accumulated deficit (104,943 ) (143,277 ) TOTAL STOCKHOLDERS’ EQUITY 515,394 466,992 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 846,985 $ 811,448 HARMONY BIOSCIENCES HOLDINGS, INC. RECONCILIATION OF GAAP TO NON-GAAP FINANCIAL RESULTS (In thousands except share and per share data) Three Months Ended March 31, March 31, 2024 2023 GAAP net income $ 38,334 $ 29,485 Non-GAAP Adjustments: Non-cash interest expense (1) 180 416 Depreciation 163 103 Amortization (2) 5,961 5,961 Stock-based compensation expense 10,434 6,561 Licensing fees and milestone payments (3) - 750 Income tax effect related to non-GAAP adjustments (4) (4,350 ) (2,538 ) Non-GAAP adjusted net income $ 50,722 $ 40,738 GAAP reported net income per diluted share $ 0.67 $ 0.48 Non-GAAP adjusted net income per diluted share $ 0.88 $ 0.67 Weighted average number of shares of common stock used in non-GAAP diluted per share 57,597,627 61,221,511 (1) Includes amortization of deferred finance charges. (2) Includes amortization of intangible asset related to WAKIX. (3) Includes milestone payment related to HBS102 preclinical milestone in March 2023. (4) Calculated using the reported effective tax rate for the periods presented less impact of valuation allowance release and discrete items. Harmony Biosciences Investor Contact: Luis Sanay, CFA 445-235-8386 lsanay@harmonybiosciences.com Harmony Biosciences Media Contact: Cate McCanless 202-641-6086 cmccanless@harmonybiosciences.com