SODIUM FLUORIDE F-18

Initiated the Phase 3 VELA program of the Nanobody® sonelokimab in patients with moderate-to-severe hidradenitis suppurativa (HS) and the Phase 3 IZAR program in patients with active psoriatic arthritis (PsA) following positive FDA and EMA regulatory feedback, continuing to support a potential best-in-class profile across two key indications Initiated three new trials in the beginning of 2025 with the Nanobody® sonelokimab: Phase 3 VELA-TEEN trial in adolescent hidradenitis suppurativa (HS), Phase 2 LEDA trial in palmoplantar pustulosis (PPP) and Phase 2 S-OLARIS trial in axial spondyloarthritis (axSpA) Signed a three-year technology partnership with Komodo Health to advance research on inflammatory skin and joint conditions to tap into Komodo’s technology and real-world data Year-end cash, cash equivalents and short-term marketable debt securities of $448.0 million expected to support a roadmap rich in potential catalysts whilst providing a cash runway to at least the end of 2026 The Company will hold an in-person and virtual Capital Markets Update in Q2 of 2025 ZUG, Switzerland, February 26, 2025 – MoonLake Immunotherapeutics (NASDAQ: MLTX) (“MoonLake”), a clinical-stage biotechnology company advancing therapies to address significant unmet needs in inflammatory skin and joint diseases, today announced its financial results for the fourth quarter and year ended December 31, 2024. Dr. Jorge Santos da Silva, Chief Executive Officer of MoonLake Immunotherapeutics, said: "In 2024, we successfully advanced to Phase 3 clinical trials across several potential blockbuster indications with the launch of our Phase 3 VELA and Phase 3 IZAR programs, leaving us strongly positioned ahead of a data-rich 2025. With seven ongoing Phase 2 and Phase 3 trials, plus other ancillary trials running, this has been a time dedicated to execution, as we previously announced. With our pivotal HS data expected as of mid-2025, our focus is firmly on bringing this innovation to patients as we move towards commercialization.” Q4 highlights (including post-quarter end) Announced the initiation of two Phase 3 trials for active PsA with one focusing on biologic-naïve patients and including evaluation of radiographic progression (IZAR-1) and the other focusing on TNF-IR patients while being the first trial to include risankizumab as an active reference arm (IZAR-2) Initiated three new trials in the beginning of 2025 with the Nanobody® sonelokimab: Phase 3 VELA-TEEN trial in adolescent HS, Phase 2 LEDA trial in PPP and Phase 2 S-OLARIS trial in axSpA Fourth quarter and year-end financial results As of December 31, 2024, MoonLake held cash, cash equivalents and short-term marketable debt securities of $448.0 million, compared to $493.9 million as of September 30, 2024. The decrease of $45.9 million was primarily attributable to an increase in clinical trial activities, partially offset by interest income on cash, cash equivalents and short-term marketable debt securities. Matthias Bodenstedt, Chief Financial Officer at MoonLake Immunotherapeutics, said: “In 2024, MoonLake transitioned into a late-stage clinical biotechnology company working in several growing multibillion-dollar dermatological and rheumatological indications. We have remained focused on careful cost control for shareholders, and continue to have a very healthy cash balance to support the growth of the business. We look forward to a data rich year ahead which could be transformational for the business.” Research and development expenses for the fourth quarter ended December 31, 2024 were $40.4 million, compared to $35.7 million in the previous quarter. Research and development expenses for the year ended December 31, 2024 were $112.8 million, compared to $31.8 million in the previous year. The increase of $81.0 million primarily related to an increase of $47.7 million in expenses pertaining to clinical development trials with contract research organizations, including the Phase 3 VELA program in HS and the Phase 3 IZAR program in PsA, as well as the additional trials in adolescent HS (the VELA-TEEN trial), PPP (the LEDA trial), axSpA (the S-OLARIS trial) and PsA (the P-OLARIS trial). An additional increase of $23.7 million related to supply and logistic services for such clinical development trials, including the purchase of a comparator drug for the IZAR-2 trial in PsA, and an increase of $5.4 million in personnel-related costs to support the Company’s research and development efforts. General and administrative expenses for the fourth quarter ended December 31, 2024 were $9.2 million, compared to $7.4 million in the previous quarter. General and administrative expenses for the year ended December 31, 2024 were $30.3 million, compared to $22.3 million in the previous year. The increase of $8.0 million primarily related to an increase of $3.3 million in personnel-related costs to support organizational growth, an increase of $2.4 million in expenses for advisory and professional services to support organizational growth, an increase of $1.6 million in office expenses driven by the new leases for additional office space, and an increase of $1.2 million in market research expenses. Other income, net for the year ended December 31, 2024 was $22.1 million, compared to $10.1 million for the previous year. The increase of $12.0 million primarily related to an increase of $12.3 million in realized interest on cash held in bank and cash investments in short-term marketable debt securities. Net loss for the year ended December 31, 2024 was $121.2 million, compared to $44.1 million for the previous year. Capital Markets Update in Q2 of 2025 The Company will hold an in-person and virtual Capital Markets Update in the second quarter of 2025 to provide an update on the Phase 3 HS VELA program, discuss additional clinical data and update the market on financials. Upcoming conferences TD Cowen 45th Annual Healthcare Conference: March 3-5 (Boston, US) American Association of Dermatology Annual Meeting (AAD): March 7-11 (Orlando, US) Leerink Partners Global Biopharma Conference: March 10-12 (Miami, US) Barclays 27th Global Healthcare Conference: March 11-13 (Miami, US) - Ends - About MoonLake Immunotherapeutics MoonLake Immunotherapeutics is a clinical-stage biopharmaceutical company unlocking the potential of sonelokimab, a novel investigational Nanobody® for the treatment of inflammatory disease, to revolutionize outcomes for patients. Sonelokimab inhibits IL-17A and IL-17F by inhibiting the IL-17A/A, IL-17A/F, and IL-17F/F dimers that drive inflammation. The Company’s focus is on inflammatory diseases with a major unmet need, including hidradenitis suppurativa and psoriatic arthritis – conditions affecting millions of people worldwide with a large need for improved treatment options. MoonLake was founded in 2021 and is headquartered in Zug, Switzerland. Further information is available at www.moonlaketx.com. About Nanobodies® Nanobodies® represent a new generation of antibody-derived targeted therapies. They consist of one or more domains based on the small antigen-binding variable regions of heavy-chain-only antibodies (VHH). Nanobodies® have a number of potential advantages over traditional antibodies, including their small size, enhanced tissue penetration, resistance to temperature changes, ease of manufacturing, and their ability to be designed into multivalent therapeutic molecules with bespoke target combinations. The terms Nanobody® and Nanobodies® are trademarks of Ablynx, a Sanofi company. About Sonelokimab Sonelokimab (M1095) is an investigational ~40 kDa humanized Nanobody® consisting of three variable regions of heavy-chain-only antibodies domains (VHHs) covalently linked by flexible glycine-serine spacers. With two domains, sonelokimab selectively binds with high affinity to IL-17A and IL-17F, thereby inhibiting the IL-17A/A, IL-17A/F, and IL-17F/F dimers. A third central domain binds to human albumin, facilitating further enrichment of sonelokimab at sites of inflammatory edema. Sonelokimab is being assessed in two lead indications, hidradenitis suppurative (HS) and psoriatic arthritis (PsA), and the Company is pursuing other indications in dermatology and rheumatology, including adolescent HS, palmo-plantar pustulosis (PPP) and axial spondyloarthritis (axSpA). For adults with HS, sonelokimab is being assessed in the Phase 3 trials, VELA-1 and VELA-2, following the successful outcome of MoonLake’s end-of-Phase 2 interactions with the FDA and as well as positive feedback from its interactions with the EMA announced in February 2024. In June 2023, topline results of the MIRA trial (NCT05322473) at 12 weeks showed that the trial met its primary endpoint, the Hidradenitis Suppurativa Clinical Response (HiSCR) 75, which is a higher measure of clinical response versus the HiSCR50 measure used in other clinical trials, setting a landmark milestone. In October 2023, the full dataset from the MIRA trial at 24 weeks showed that maintenance treatment with sonelokimab led to further improvements in HiSCR75 response rates and other high threshold clinical and patient relevant outcomes. The safety profile of sonelokimab in the MIRA trial was consistent with previous trials with no new safety signals detected. Sonelokimab is currently undergoing evaluation in the VELA-TEEN Phase 3 trial, which is the first clinical study specifically focused on adolescent patients with moderate-to-severe HS. For PsA, sonelokimab is being assessed in the Phase 3 trials, IZAR-1 and IZAR-2, following the announcement in March 2024 of the full dataset from the global Phase 2 ARGO trial (M1095-PSA-201) evaluating the efficacy and safety of the Nanobody® sonelokimab over 24 weeks in patients with active PsA. Significant improvements were observed across all key outcomes, including approximately 60% of patients treated with sonelokimab achieving an American College of Rheumatology (ACR) 50 response and Minimal Disease Activity (MDA) at week 24. This followed the positive top-line results in November 2023, where the trial met its primary endpoint with a statistically significant greater proportion of patients treated with either sonelokimab 60mg or 120mg (with induction) achieving an ACR50 response compared to those on placebo at week 12. All key secondary endpoints in the trial were met for the 60mg and 120mg doses with induction. The safety profile of sonelokimab in the ARGO trial was consistent with previous trials with no new safety signals detected. Sonelokimab is also being assessed in the Phase 2 LEDA trial, which is ongoing for PPP, a debilitating inflammatory skin condition affecting a significant number of patients. Additionally, Sonelokimab is being assessed in the ongoing Phase 2 S-OLARIS trial for active axSpA. The trial features an innovative design complementing traditional clinical outcomes with cellular imaging techniques. Sonelokimab has also been assessed in a randomized, placebo-controlled third-party Phase 2b trial (NCT03384745) in 313 patients with moderate-to-severe plaque-type psoriasis. High threshold clinical responses (Investigator’s Global Assessment Score 0 or 1, and Psoriasis Area and Severity Index 90/100) were observed in patients with moderate-to-severe plaque-type psoriasis. Sonelokimab was generally well tolerated, with a safety profile similar to the active control, secukinumab (Papp KA, et al. Lancet. 2021; 397:1564-1575). In an earlier third-party Phase 1 trial in patients with moderate-to-severe plaque-type psoriasis, sonelokimab has been shown to decrease (to normal skin levels) the cutaneous gene expression of pro-inflammatory cytokines and chemokines (Svecova D. J Am Acad Dermatol. 2019;81:196–203). About the VELA program The Phase 3 VELA program is expected to enroll 800 patients across VELA-1 and VELA-2. Both global, randomized, double-blind, placebo-controlled trials are identical in design evaluating the efficacy and safety of the Nanobody® sonelokimab, administered subcutaneously, in adult patients with active moderate-to-severe hidradenitis suppurativa. Similar to the design of the landmark Phase 2 MIRA trial, the primary endpoint is the percentage of participants achieving Hidradenitis Suppurativa Clinical Response (HiSCR) 75, defined as a ≥75% reduction in total abscess and inflammatory nodule (AN) count with no increase in abscess or draining tunnel count relative to baseline. The trials will also evaluate a number of secondary endpoints, including the proportion of patients achieving HiSCR50, the change from baseline in International Hidradenitis Suppurativa Severity Score System (IHS4), the proportion of patients achieving a Dermatology Life Quality Index (DLQI) total reduction of ≥4, the proportion of patients achieving at least 50% reduction from baseline in Numerical Rating Scale (NRS50) in the Patient’s Global Assessment of Skin Pain (PGA Skin Pain) and complete resolution of Draining Tunnels (DT100). Further details are available under NCT06411379 and NCT06411899 at ClinicalTrials.gov. About the VELA-TEEN trial The Phase 3 VELA-TEEN trial is an open-label, single-arm trial designed to evaluate sonelokimab 120mg administered subcutaneously once every two weeks (Q2W) until week six and once every four weeks (Q4W) from week eight onwards. The trial aims to enroll 30-40 adolescents, aged 12-17, with moderate-to-severe hidradenitis suppurativa, from U.S. sites experienced in clinical trials and pediatric dermatology. The primary trial phase will be 24 weeks with a primary endpoint evaluating the pharmacokinetics, safety, and tolerability of sonelokimab. VELA-TEEN will also evaluate several secondary endpoints, including the proportion of patients achieving the higher clinical response measure of the Hidradenitis Suppurativa Clinical Response Score (HiSCR) 75, in addition to HiSCR50. Other outcomes are the change from baseline in the International Hidradenitis Suppurativa Severity Score System (IHS4), which includes the quantitative measure of draining tunnels, and the proportion of patients achieving a meaningful reduction of the Children’s Dermatology Life Quality Index (CDLQI) and the Patients Global Assessment of Skin Pain (PGA Skin Pain). Further details are available under NCT06768671 at ClinicalTrials.gov. About Hidradenitis Suppurativa Hidradenitis suppurativa (HS) is a severely debilitating chronic skin condition resulting in irreversible tissue destruction. HS manifests as painful inflammatory skin lesions, typically around the armpits, groin, and buttocks. Over time, uncontrolled and inadequately treated inflammation can result in irreversible tissue destruction and scarring. The disease affects an estimated 2% of the population, with three times more females affected than males. Real-world data in the US indicates that at least 2 million unique patients have been diagnosed with and treated for HS between 2016 and 2023 alone, highlighting a significant unmet need and impact on healthcare systems, and a market opportunity projected to reach $15bn by 2035. Onset typically occurs in early adulthood and HS has a profound negative impact on quality of life, with a higher morbidity than other dermatologic conditions. There is increasing scientific evidence to support IL-17A- and IL-17F-mediated inflammation as a key driver of the pathogenesis of HS, with other identified risk factors including genetics, cigarette smoking, and obesity. About the IZAR Program IZAR-1 (NCT06641076) and IZAR-2 (NCT06641089) are global, randomized, double-blind, placebo-controlled Phase 3 trials designed to evaluate the efficacy and safety of sonelokimab compared with placebo in a total of approximately 1,500 adults with active psoriatic arthritis (PsA), with a primary endpoint of superiority to placebo in American College of Rheumatology (ACR) 50 response at Week 16. IZAR-1 is expected to enroll biologic-naïve patients and include an evaluation of radiographic progression, while IZAR-2 is expected to enroll patients with an inadequate response to tumor necrosis factor-α inhibitors (TNF-IR) — reflecting patients commonly seen in clinical practice — and is the first PsA trial to include a risankizumab active reference arm. Both trials will also assess a range of secondary endpoints reflecting the multiple disease manifestations characteristic of PsA. These include skin and nail outcomes, multidomain outcomes, and patient-reported outcome measures such as pain and quality of life assessments. Further details are available under NCT06641076 and NCT06641089 at ClinicalTrials.gov. About Psoriatic Arthritis Psoriatic arthritis (PsA) is a chronic, progressive and complex inflammatory disease that manifests across multiple domains, leading to substantial functional impairment and decreased quality of life. The clinical features of PsA are diverse, comprising both musculoskeletal (peripheral arthritis, spondylitis, dactylitis, and enthesitis) and non-musculoskeletal (skin and nail disease) domains. PsA occurs in up to 30% of patients with psoriasis, most commonly those aged between 30 and 60 years. Although the exact mechanism of disease is not fully understood, evidence suggests that activation of the IL-17 pathway plays an important role in the disease pathophysiology. About the S-OLARIS trial S-OLARIS is an open-label Phase 2 proof-of-concept trial aiming to investigate sonelokimab 60mg administered subcutaneously in approximately 25 patients with active axial spondylarthritis (axSpA). The primary endpoint is the change from baseline (CfB) at week 12 in the uptake of 18F-NaF in the sacroiliac joints and spine using PET in combination with MRI imaging. Throughout the trial, several other endpoints will be assessed including established clinical disease activity outcomes (e.g., ASAS), scores related to physical function, spinal mobility, and enthesitis as well as patient reported outcomes. The trial also includes an exploratory peripheral blood and tissue biomarker program. About Axial Spondyloarthritis Axial Spondyloarthritis (axSpA) typically impacts young people, with diagnosis based on chronic inflammatory back pain lasting more than three months with onset under 45 years of age. Advanced disease can lead to progressive and pathologic bone formation and joint fusion, severely limiting spinal mobility. Global reported prevalence of axSpA ranges from 0.5% to 1.5%. AxSpA can be categorized by disease progression into two subtypes: non-radiographic axSpA and ankylosing spondylitis (AS), also known as radiographic axSpA, which is diagnosed based on radiographic evidence of structural changes to the sacroiliac joints. Patients with axSpA experience fatigue, persistent morning stiffness, and pain that worsens at night and can disrupt sleep. Many patients also face the burden of comorbidities such as psoriatic arthritis and psoriasis. Studies have found elevated IL-17 levels in the blood and synovial fluid of patients with axSpA, and IL-17A and IL-17F are both thought to be key contributors to pathogenesis across the spondyloarthropathies. About the LEDA Trial The LEDA trial is a Phase 2 trial designed to evaluate the efficacy and safety of sonelokimab 120mg administered subcutaneously in adult patients with palmoplantar pustulosis (PPP). The primary endpoint of the trial is percent change from baseline in Palmoplantar Psoriasis Area and Severity Index (ppPASI) with important secondary endpoints including ppPASI75 (at least 75% improvement in the ppPASI). The LEDA trial features an innovative translational research program using peripheral blood and tissue biomarkers as trial controls. The trial design has been informed by previous successful studies of sonelokimab, including the landmark Phase 2 MIRA trial in hidradenitis suppurativa, which identified the optimal dosing and demonstrated the potential of sonelokimab to target deep tissue inflammation effectively. About Palmoplantar Pustulosis Palmoplantar Pustulosis (PPP) is characterized by the development of blister-like pustules within erythematous, scaly plaques on the palms and the soles of the feet. PPP typically develops in adulthood, more frequently impacts females. Patients frequently experience significant pain, burning, and itching sensations on the palms and soles of the feet which can be debilitating and impair their ability to work, sleep, or perform other activities of daily living. Currently, the treatment of PPP is challenging with a significant unmet need for novel therapies to reduce the symptom burden for patients. Evidence suggests that activation of the IL-17 pathway has an important role in disease pathophysiology. Cautionary Statement Regarding Forward Looking Statements This press release contains certain “forward-looking statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding MoonLake’s expectations, hopes, beliefs, intentions or strategies regarding the future including, without limitation, statements regarding: trial design, plans for and timing of clinical trials; enrollment for clinical trials, including the Phase 3 VELA program, the VELA-TEEN trial and the IZAR program; the efficacy and safety of sonelokimab for the treatment of adult HS, adolescent HS, PPP, PsA and axSpA, including in comparison to existing standards or care or other competing therapies, clinical trials and research and development programs; the anticipated timing of the results from those studies and trials, including timing of topline results from the Phase 3 VELA trials in adult HS, and potential market opportunities for sonelokimab and MoonLake’s anticipated cash position. In addition, any statements that refer to projections, forecasts, or other characterizations of future events or circumstances, including any underlying assumptions, are forward looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that statement is not forward looking. Forward-looking statements are based on current expectations and assumptions that, while considered reasonable by MoonLake and its management, as the case may be, are inherently uncertain. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Actual results could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include, without limitation, risks and uncertainties associated with MoonLake’s business in general and limited operating history, difficulty enrolling patients in clinical trials, state and federal healthcare reform measures that could result in reduced demand for MoonLake’s product candidates and reliance on third parties to conduct and support its preclinical studies and clinical trials and the other risks described in or incorporated by reference into MoonLake’s Annual Report on Form 10-K for the year ended December 31, 2023 and subsequent filings with the Securities and Exchange Commission. Nothing in this press release should be regarded as a representation by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward-looking statements will be achieved. You should not place undue reliance on forward-looking statements in this press release, which speak only as of the date they are made and are qualified in their entirety by reference to the cautionary statements herein. MoonLake does not undertake or accept any duty to release publicly any updates or revisions to any forward-looking statements to reflect any change in its expectations or in the events, conditions or circumstances on which any such statement is based. MoonLake Immunotherapeutics Media & Investors Relations Carla Bretes, Director IR & External Communications ir@moonlaketx.com ICR Healthcare Mary-Jane Elliott, Namrata Taak, Ashley Tapp Tel: +44 (0) 20 3709 5700 MoonLake@ICRHealthcare.com MOONLAKE IMMUNOTHERAPEUTICS CONSOLIDATED BALANCE SHEETS (Amounts in USD, except share data) MOONLAKE IMMUNOTHERAPEUTICS CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Amounts in USD, except share and per share data)

New trials in three new indications have been initiated with the Nanobody® sonelokimab: Phase 3 VELA-TEEN trial in adolescent hidradenitis suppurativa (HS), Phase 2 LEDA trial in palmoplantar pustulosis (PPP) and Phase 2 S-OLARIS trial in axial spondyloarthritis (axSpA)MoonLake now independently running seven trials in 2025 across large dermatology and rheumatology indications: adult HS, adolescent HS, psoriatic arthritis (PsA), PPP and axSpAPhase 2 and Phase 3 data read-outs across all target indications expected in 2025 (adult HS, and PPP) and 2026 (adolescent HS, PsA and axSpA)Data from the Phase 3 VELA-TEEN trial may be combined with the Phase 3 VELA program in adults with moderate-to-severe HS to support the first Biologics License Application (BLA) for the Nanobody® sonelokimab Zug, Switzerland, January 8, 2025 – MoonLake Immunotherapeutics (MoonLake; Nasdaq: MLTX), a clinical-stage biotechnology company focused on creating next-level therapies for inflammatory diseases, today announced that patients have been screened in three new trials across three new indications to evaluate sonelokimab, an investigational Nanobody® designed to treat inflammatory disease. The clinical program for sonelokimab now includes patients with adolescent hidradenitis suppurativa (HS), palmoplantar pustulosis (PPP) and axial spondyloarthritis (axSpA), in addition to adult patients with HS and active psoriatic arthritis (PsA). This increases the number of clinical trials led by MoonLake to ten and aligns with the plan to enroll over 3,000 patients in clinical trials with sonelokimab since the Company was founded in 2021. Evidence indicates that activation of IL-17A and IL-17F plays a crucial role in the pathophysiology of these inflammatory diseases. Sonelokimab is designed to directly target sites of inflammation by inhibiting all relevant IL-17 dimers, namely the IL-17A/A, IL-17A/F, and IL-17F/F dimers, and to penetrate difficult-to-reach inflamed tissues. The initiation of the Phase 3 VELA-TEEN trial in HS, the Phase 2 LEDA trial in PPP and the Phase 2 S-OLARIS trial in axSpA expands the portfolio of sonelokimab to large dermatology and rheumatology indications, where significant unmet needs remain. Dr. Jorge Santos da Silva, Founder and Chief Executive Officer of MoonLake Immunotherapeutics, said: “The start of three new trials across three new dermatology and rheumatology indications underscores MoonLake’s remarkable and rapid progress in independently realizing our ambitious plans. 2024 has been a year of execution, and 2025 is anticipated to mark a transformational and data-rich year as we look forward to notably reporting key Phase 3 data for HS, a market projected to reach $15bn by 2035. We are progressing towards registration and commercialization with a robust cash position. A huge thanks is due to our talented team for expanding possibilities, and of course, to all the patients and healthcare professionals for their participation in our trials.” Prof. Kristian Reich, Founder and Chief Scientific Officer at MoonLake commented: “Building upon our ongoing Phase 3 studies in HS and PsA, we are further leveraging the molecular advantages of our Nanobody®, sonelokimab, in adolescent HS, PPP, and axSpA, all diseases characterized by activation of the IL-17 and IL-17F pathway in difficult-to-reach tissues. We are pioneering a paradigm shift in innovative trial design, which has given us the agility to rapidly execute these new clinical trials.” Building upon the Phase 2 MIRA trial and ongoing Phase 3 VELA trials in adult HS, the Phase 2 ARGO trial and the ongoing Phase 3 IZAR trials in active PsA, the three new trials are: Phase 3 VELA-TEEN: the first dedicated clinical trial in adolescent patients with moderate-to-severe hidradenitis suppurativa (HS) An open-label, single-arm trial with the primary endpoint to evaluate the pharmacokinetics, safety, and tolerability of the 120mg subcutaneous (SC) dose of sonelokimab over 24 weeks in 30-40 adolescents, aged 12-17, with moderate-to-severe HS, from U.S. sites with experience in pediatric dermatology.HS is a chronic, debilitating skin condition affecting an estimated 2% of the population. It often first manifests during adolescence, and adolescent patients are particularly physically and emotionally affected by the disease. Early intervention is therefore crucial to prevent disease progression and reduce the long-term physical and emotional impact. Data from the VELA-TEEN trial may be combined with data from the Phase 3 VELA program in adults with moderate-to-severe HS to support a single Biologics License Application (BLA). Topline data for the primary and secondary endpoints, including the higher clinical response level of HiSCR75, are anticipated in 2026. Amy S. Paller, M.D, Walter J. Hamlin Professor and Chair of Dermatology and Professor of Pediatrics at Northwestern University Feinberg School of Medicine, and Principal Investigator of the trial commented: “Adolescents with HS face substantial unmet medical needs and are a critically underserved patient population. The VELA-TEEN trial marks a significant advancement in HS treatment. By prioritizing early intervention, we hope to alter the disease course, reduce tissue destruction, and prevent permanent damage.” Phase 2 LEDA: the first clinical trial in palmoplantar pustulosis (PPP) for an IL-17A and IL-17F inhibitor The trial aims to enroll approximately 30 patients across multiple sites to evaluate the 120mg SC dose of sonelokimab. The primary endpoint will be percent change from baseline in Palmoplantar Psoriasis Area and Severity Index (ppPASI) with important secondary endpoints including ppPASI75 (at least 75% improvement in the ppPASI).A biomarker-controlled clinical trial.The topline primary endpoint readout is expected during 2025. Mark Lebwohl, MD, Dean for Clinical Therapeutics, Icahn School of Medicine at Mount Sinai, and Chairman Emeritus, Kimberly and Eric J. Waldman Department of Dermatology commented: “Palmoplantar pustulosis is a chronic, recurrent inflammatory condition affecting the palms and soles, marked by aggressive pustule eruptions, skin destruction, and severe pain. This ongoing skin damage is debilitating, significantly impacting patients’ daily lives and activities. Despite the severity, advanced therapies remain scarce. It is exciting to see studies with innovative technologies like nanobodies to address this urgent medical need.” Phase 2 S-OLARIS: the first trial for an IL-17A and IL-17F inhibitor using an innovative design combining traditional clinical outcomes for axial spondyloarthritis (axSpA) with PET/MRI imaging An open-label trial to evaluate a 60mg SC dose of sonelokimab in approximately 25 patients with active axSpA. The primary endpoint is the change from baseline (CfB) at week 12 in the uptake of 18F-NaF in the sacroiliac joints and spine using PET in combination with MRI imaging. By combining established clinical measures with innovative PET imaging techniques and a biomarker program, the trial will for the first time measure sonelokimab's impact on deep tissue inflammation in unprecedented detail.axSpA is a chronic inflammatory condition that primarily affects the spine and sacroiliac joints, with a global prevalence ranging between 0.5% and 1.5%. Up to 40% of patients either do not respond to or cannot tolerate currently available treatments.The topline primary endpoint readout is expected in early 2026. Professor Xenofon Baraliakos, Rheumazentrum Ruhrgebiet Herne, Ruhr-University Bochum, Germany commented: “Despite advancements in axial spondyloarthritis (axSpA) treatment over the past two decades, innovation remains crucial. Many patients experience inadequate responses to current therapies, and we need to continue to push the boundaries and explore novel approaches that can address not only inflammation across several domains but potentially modify the underlying disease processes. Integrating cutting-edge imaging techniques like MRI-PET with clinical outcomes, as being used in the S-OLARIS trial, offers a promising path forward. I am excited to see such a promising innovation like nanobodies, and specifically sonelokimab, being developed for axSpA. Our goal must be to develop more effective treatments that can improve long-term outcomes, reduce disease progression, and enhance the quality of life for all axSpA patients." The Company also plans to initiate a Phase 2 trial, P-OLARIS, in patients with active PsA using an innovative design combining traditional clinical outcomes with PET/MRI imaging. - Ends - About the VELA-TEEN trialThe Phase 3 VELA-TEEN trial is an open-label, single-arm trial designed to evaluate sonelokimab 120mg administered subcutaneously once every two weeks (Q2W) until week six and once every four weeks (Q4W) from week eight onwards. The trial aims to enroll 30-40 adolescents, aged 12-17, with moderate-to-severe hidradenitis suppurativa (HS), from U.S. sites experienced in clinical trials and pediatric dermatology. The primary trial phase will be 24 weeks with a primary endpoint evaluating the pharmacokinetics, safety, and tolerability of sonelokimab. VELA-TEEN will also evaluate several secondary endpoints, including the proportion of patients achieving the higher clinical response measure of the Hidradenitis Suppurativa Clinical Response Score (HiSCR) 75, in addition to HiSCR50. Other outcomes are the change from baseline in the International Hidradenitis Suppurativa Severity Score System (IHS4), which includes the quantitative measure of draining tunnels, and the proportion of patients achieving a meaningful reduction of the Children’s Dermatology Life Quality Index (CDLQI) and the Patients Global Assessment of Skin Pain (PGA Skin Pain). About Hidradenitis SuppurativaHS is a severely debilitating chronic skin condition resulting in irreversible tissue destruction. HS manifests as painful inflammatory skin lesions, typically around the armpits, groin, and buttocks. Over time, uncontrolled and inadequately treated inflammation can result in irreversible tissue destruction and scarring. The disease affects an estimated 2% of the population, with three times more females affected than males. Real-world data in the US indicates that at least 2 million unique patients have been diagnosed with and treated for HS between 2016 and 2023 alone, highlighting a significant unmet need and impact on healthcare systems, and a market opportunity projected to reach $15bn by 2035. Onset typically occurs in early adulthood and HS has a profound negative impact on quality of life, with a higher morbidity than other dermatologic conditions. There is increasing scientific evidence to support IL-17A- and IL-17F-mediated inflammation as a key driver of the pathogenesis of HS, with other identified risk factors including genetics, cigarette smoking, and obesity. About the S-OLARIS trialS-OLARIS is an open-label Phase 2 proof-of-concept trial aiming to investigate sonelokimab 60mg administered subcutaneously in approximately 25 patients with active axial spondylarthritis (axSpA). The primary endpoint is the change from baseline (CfB) at week 12 in the uptake of 18F-NaF in the sacroiliac joints and spine using PET in combination with MRI imaging. Throughout the trial, several other endpoints will be assessed including established clinical disease activity outcomes (e.g., ASAS), scores related to physical function, spinal mobility, and enthesitis as well as patient reported outcomes. The trial also includes an exploratory peripheral blood and tissue biomarker program. About active axial spondyloarthritisAxSpA typically impacts young people, with diagnosis based on chronic inflammatory back pain lasting more than three months with onset under 45 years of age. Advanced disease can lead to progressive and pathologic bone formation and joint fusion, severely limiting spinal mobility. Global reported prevalence of axSpA ranges from 0.5% to 1.5%. AxSpA can be categorized by disease progression into two subtypes: non-radiographic axSpA and ankylosing spondylitis (AS), also known as radiographic axSpA, which is diagnosed based on radiographic evidence of structural changes to the sacroiliac joints. Patients with axSpA experience fatigue, persistent morning stiffness, and pain that worsens at night and can disrupt sleep. Many patients also face the burden of comorbidities such as psoriatic arthritis and psoriasis. Studies have found elevated IL-17 levels in the blood and synovial fluid of patients with axSpA, and IL-17A and IL-17F are both thought to be key contributors to pathogenesis across the spondyloarthropathies. About the LEDA TrialThe LEDA trial is a Phase 2 trial designed to evaluate the efficacy and safety of sonelokimab 120mg administered subcutaneously in adult patients with palmoplantar pustulosis (PPP). The primary endpoint of the trial is percent change from baseline in Palmoplantar Psoriasis Area and Severity Index (ppPASI) with important secondary endpoints including ppPASI75 (at least 75% improvement in the ppPASI). The LEDA trial features an innovative translational research program using peripheral blood and tissue biomarkers as trial controls. The trial design has been informed by previous successful studies of sonelokimab, including the landmark Phase 2 MIRA trial in hidradenitis suppurativa, which identified the optimal dosing and demonstrated the potential of sonelokimab to target deep tissue inflammation effectively. About Palmoplantar PustulosisPPP is characterized by the development of blister-like pustules within erythematous, scaly plaques on the palms and the soles of the feet. PPP typically develops in adulthood, more frequently impacts females. Patients frequently experience significant pain, burning, and itching sensations on the palms and soles of the feet which can be debilitating and impair their ability to work, sleep, or perform other activities of daily living. Currently, the treatment of PPP is challenging with a significant unmet need for novel therapies to reduce the symptom burden for patients. Evidence suggests that activation of the IL-17 pathway has an important role in disease pathophysiology. About SonelokimabSonelokimab (M1095) is an investigational ~40 kDa humanized Nanobody® consisting of three VHH domains covalently linked by flexible glycine-serine spacers. With two domains, sonelokimab selectively binds with high affinity to IL-17A and IL-17F, thereby inhibiting the IL-17A/A, IL-17A/F, and IL-17F/F dimers. A third central domain binds to human albumin, facilitating further enrichment of sonelokimab at sites of inflammatory edema. Sonelokimab is being assessed in two lead indications, HS and psoriatic arthritis (PsA), and the Company is pursuing other indications in dermatology and rheumatology, including adolescent HS, PPP and axSpA. For adults with HS, sonelokimab is being assessed in the Phase 3 trials, VELA-1 and VELA-2, following the successful outcome of MoonLake’s end-of-Phase 2 interactions with the FDA and as well as positive feedback from its interactions with the EMA announced in February 2024. In June 2023, topline results of the MIRA trial (NCT05322473) at 12 weeks showed that the trial met its primary endpoint, the Hidradenitis Suppurativa Clinical Response (HiSCR)75, which is a higher measure of clinical response versus the HiSCR50 measure used in other clinical trials, setting a landmark milestone. In October 2023, the full dataset from the MIRA trial at 24 weeks showed that maintenance treatment with sonelokimab led to further improvements in HiSCR75 response rates and other high threshold clinical and patient relevant outcomes. The safety profile of sonelokimab in the MIRA trial was consistent with previous trials with no new safety signals detected. A Phase 3 trial, VELA-TEEN, is also ongoing in adolescent HS, a disease that typically begins at this early stage of a patient’s life, and is also the period in which irreversible damage and inflammatory remission are most critical. For PsA, sonelokimab is being assessed in the Phase 3 trials, IZAR-1 and IZAR-2, following the announcement in March 2024 of the full dataset from the global Phase 2 ARGO trial (M1095-PSA-201) evaluating the efficacy and safety of the Nanobody® sonelokimab over 24 weeks in patients with active PsA. Significant improvements were observed across all key outcomes, including approximately 60% of patients treated with sonelokimab achieving an American College of Rheumatology (ACR) 50 response and Minimal Disease Activity (MDA) at week 24. This followed the positive top-line results in November 2023, where the trial met its primary endpoint with a statistically significant greater proportion of patients treated with either sonelokimab 60mg or 120mg (with induction) achieving an ACR50 response compared to those on placebo at week 12. All key secondary endpoints in the trial were met for the 60mg and 120mg doses with induction. The safety profile of sonelokimab in the ARGO trial was consistent with previous trials with no new safety signals detected. Sonelokimab is also being assessed in the Phase 2 LEDA trial, which is ongoing for palmo-plantar pustulosis (PPP), a debilitating inflammatory skin condition affecting a significant number of patients. Additionally, Sonelokimab is being assessed in the ongoing Phase 2 S-OLARIS trial, for active axSpA. The trial features an innovative design complementing traditional clinical outcomes with cellular imaging techniques. Sonelokimab has also been assessed in a randomized, placebo-controlled third-party Phase 2b trial (NCT03384745) in 313 patients with moderate-to-severe plaque-type psoriasis. High threshold clinical responses (Investigator’s Global Assessment Score 0 or 1, and Psoriasis Area and Severity Index 90/100) were observed in patients with moderate-to-severe plaque-type psoriasis. Sonelokimab was generally well tolerated, with a safety profile similar to the active control, secukinumab (Papp KA, et al. Lancet. 2021; 397:1564-1575). In an earlier third-party Phase 1 trial in patients with moderate-to-severe plaque-type psoriasis, sonelokimab has been shown to decrease (to normal skin levels) the cutaneous gene expression of pro-inflammatory cytokines and chemokines (Svecova D. J Am Acad Dermatol. 2019;81:196–203). About Nanobodies®Nanobodies® represent a new generation of antibody-derived targeted therapies. They consist of one or more domains based on the small antigen-binding variable regions of heavy-chain-only antibodies (VHH). Nanobodies® have a number of potential advantages over traditional antibodies, including their small size, enhanced tissue penetration, resistance to temperature changes, ease of manufacturing, and their ability to be designed into multivalent therapeutic molecules with bespoke target combinations. The terms Nanobody® and Nanobodies® are trademarks of Ablynx, a Sanofi company. About MoonLake ImmunotherapeuticsMoonLake Immunotherapeutics is a clinical-stage biopharmaceutical company unlocking the potential of sonelokimab, a novel investigational Nanobody® for the treatment of inflammatory disease, to revolutionize outcomes for patients. Sonelokimab inhibits IL-17A and IL-17F by inhibiting the IL-17A/A, IL-17A/F, and IL-17F/F dimers that drive inflammation. The company’s focus is on inflammatory diseases with a major unmet need, including hidradenitis suppurativa and psoriatic arthritis – conditions affecting millions of people worldwide with a large need for improved treatment options. MoonLake was founded in 2021 and is headquartered in Zug, Switzerland. Further information is available at www.moonlaketx.com. Cautionary Statement Regarding Forward Looking StatementsThis press release contains certain “forward-looking statements” within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements include, but are not limited to, statements regarding MoonLake’s expectations, hopes, beliefs, intentions or strategies regarding the future including, without limitation, statements regarding: plans for and timing of clinical trials, including timing of topline results of the Phase 3 VELA-TEEN clinical trial of sonelokimab in adolescent patients with HS, Phase 2 LEDA clinical trial of sonelokimab in patients with PPP, Phase 2 S-OLARIS trial in patients with axSpA, Phase 3 VELA trials in adult HS and Phase 3 IZAR trials in active PsA and initiation of Phase 2 P-OLARIS trial in patients with active PsA, the efficacy and safety of sonelokimab for the treatment of adult HS, adolescent HS, PPP, PsA and axSpA, including in comparison to existing standards or care or other competing therapies, clinical trials and research and development programs, including the combination of data from the VELA-TEEN trial in adolescents with data from the Phase 3 VELA program in adults with moderate to severe HS to support a single BLA, the anticipated timing of the results from those studies and trials and potential market opportunities for sonelokimab and MoonLake’s anticipated cash position. In addition, any statements that refer to projections, forecasts, or other characterizations of future events or circumstances, including any underlying assumptions, are forward looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that statement is not forward looking. Forward-looking statements are based on current expectations and assumptions that, while considered reasonable by MoonLake and its management, as the case may be, are inherently uncertain. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Actual results could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties, which include, without limitation, risks and uncertainties associated with MoonLake’s business in general and limited operating history, difficulty enrolling patients in clinical trials, state and federal healthcare reform measures that could result in reduced demand for MoonLake’s product candidates and reliance on third parties to conduct and support its preclinical studies and clinical trials and the other risks described in or incorporated by reference into MoonLake’s Annual Report on Form 10-K for the year ended December 31, 2023 and subsequent filings with the Securities and Exchange Commission. Nothing in this press release should be regarded as a representation by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward-looking statements will be achieved. You should not place undue reliance on forward-looking statements in this press release, which speak only as of the date they are made and are qualified in their entirety by reference to the cautionary statements herein. MoonLake does not undertake or accept any duty to release publicly any updates or revisions to any forward-looking statements to reflect any change in its expectations or in the events, conditions or circumstances on which any such statement is based. MoonLake Immunotherapeutics Media & Investors RelationsCarla Bretes, Director IR & External Communicationsir@moonlaketx.com ICR Healthcare Mary-Jane Elliott, Namrata Taak, Ashley TappTel: +44 (0) 20 3709 5700MoonLake@ICRHealthcare.com