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– Data from pivotal dose level demonstrates long-term, sustained reductions in CSF levels of HS D2S6, a key biomarker of brain disease in MPS II – 80% of patients who received the pivotal dose discontinued intravenous enzyme replacement therapy or remained treatment-naïve – Submission of a rolling BLA using the accelerated approval pathway on track for Q3 2024 ROCKVILLE, MD, USA I September 3, 2024 I REGENXBIO Inc. (Nasdaq: RGNX ) today announced positive results from the Phase I/II/III CAMPSIITE ® trial of RGX-121 for the treatment of patients with Mucopolysaccharidosis Type II (MPS II), also known as Hunter syndrome. The results were presented at the Society for the Study of Inborn Errors of Metabolism (SSIEM) Annual Symposium 2024. The totality of evidence from the CAMPSIITE trial continues to support RGX-121 as the potential first gene therapy and one-time treatment for MPS II. In the United States, RGX-121 is also on track to be the first treatment that addresses the neurocognitive decline associated with MPS II, with the potential to be the first-line treatment for patients with neuronopathic disease. “As we quickly approach the BLA filing for RGX-121, we are very pleased with the data presented at SSIEM demonstrating encouraging evidence of systemic activity and long-term reductions of CSF D2S6,” said Steve Pakola, M.D., Chief Medical Officer of REGENXBIO. “The data continue to support that by restoring the gene missing in boys with Hunter syndrome, RGX-121 changes the course of disease and has the potential to significantly improve both vital brain function and the systemic manifestations of this devastating disease.” Data Summary In new, long-term data from the Phase I/II/III CAMPSIITE ® trial, patients receiving RGX-121 at the pivotal dose level demonstrated an 85% median reduction of cerebrospinal fluid (CSF) levels of heparan sulfate (HS) D2S6, a key biomarker of brain disease activity, approaching normal levels and sustained for up to two years. Topline results presented earlier this year from the CAMPSIITE trial demonstrated that the pivotal phase of the trial met its primary endpoint with statistical significance. Pivotal results were consistent with data from the dose-finding phase of CAMPSIITE, in which the majority of patients were shown to be exceeding expectations in neurodevelopmental function compared to natural history data up to four years. In the dose-finding part of the trial, investigators chose to discontinue standard-of-care intravenous enzyme replacement therapy (ERT) or to remain ERT-naïve for a majority of patients. At the pivotal dose level (dose level 3), 80% of patients were ERT-free at last time point, up to more than 18 months post-dosing. At dose level 2, 71% of patients were ERT-free at last time point, up to almost three years. As of January 5, 2024, RGX-121 continues to be well tolerated in 25 patients dosed across all phases of the CAMPSIITE trial. “A potential one-time treatment that can allow these boys to exceed the natural history of this disease in their neurocognitive development, as well as the ability to remain off enzyme replacement therapy for multiple years represents a meaningful option for patients and their families,” said Roberto Giugliani, M.D., Ph.D., Professor, Department of Genetics, UFRGS, Medical Genetics Service, HCPA, Porto Alegre, Brazil. “I continue to be very encouraged by the data supporting RGX-121 and look forward to the seeing this program advance towards potential approval for this community.” REGENXBIO is on track to initiate a rolling Biologics License Application (BLA) submission using the accelerated approval pathway in the third quarter of 2024 using CSF D2S6 as a surrogate endpoint reasonable likely to predict clinical benefit. Approval of the planned BLA could result in receipt of a Priority Review Voucher in 2025. Data presented is available on the “Publications” section of the REGENXBIO website at WWW.REGENXBIO.COM . About the CAMPSIITE ® Trial CAMPSIITE is a Phase I/II/III multicenter, open-label trial for boys aged four months up to five years with neuronopathic MPS II. The primary endpoint of the trial is measurement of CSF GAGs. Accurate and sensitive measurements of CSF GAGs, such as HS D2S6, have the potential to be considered a surrogate endpoint that is reasonably likely to predict clinical benefit in MPS II disease under the accelerated approval pathway, as buildup of GAGs in the CSF of MPS II patients correlates with clinical manifestations including neurodevelopmental deficits. The pivotal program is using commercial-scale cGMP material from REGENXBIO’s proprietary, high-yielding suspension-based manufacturing process, named NAVXpress™. In addition to measuring GAGs in the CSF, the trial will continue to collect neurodevelopmental data and caregiver-reported outcomes. About RGX-121 RGX-121 is a potential one-time AAV therapeutic for the treatment of boys with MPS II. RGX-121 expressed protein is structurally identical to normal I2S. RGX-21 Delivery of the IDS gene within cells in the CNS could provide a permanent source of secreted I2S beyond the blood-brain barrier, allowing for long-term cross correction of cells throughout the CNS. RGX-121 has received Orphan Drug Product, Rare Pediatric Disease, Fast Track and Regenerative Medicine Advanced Therapy designations from the U.S. Food and Drug Administration and advanced therapy medicinal products (ATMP) classification from the European Medicines Agency. About Mucopolysaccharidosis Type II (MPS II) MPS II, or Hunter Syndrome, is a rare, X-linked recessive disease caused by a deficiency in the lysosomal enzyme iduronate-2-sulfatase (I2S) leading to an accumulation of glycosaminoglycans (GAGs), including heparan sulfate (HS) in tissues which ultimately results in cell, tissue, and organ dysfunction, including in the central nervous system (CNS). MPS II is estimated to occur in 1 in 100,000 to 170,000 births. In severe forms of the disease, early developmental milestones may be met, but developmental delay is readily apparent by 18 to 24 months. Specific treatment to address the neurological manifestations of MPS II remains a significant unmet medical need. Key biomarkers of I2S enzymatic activity in MPS II patients include its substrate HS D2S6, which has been shown to correlate with neurocognitive manifestations of the disorder. ABOUT REGENXBIO Inc. REGENXBIO is a leading clinical-stage biotechnology company seeking to improve lives through the curative potential of gene therapy. Since its founding in 2009, REGENXBIO has pioneered the development of AAV Therapeutics, an innovative class of gene therapy medicines. REGENXBIO is advancing a pipeline of AAV Therapeutics for retinal and rare diseases, including ABBV-RGX-314 for the treatment of wet AMD and diabetic retinopathy, being developed in collaboration with AbbVie, RGX-202 for the treatment of Duchenne and RGX-121 for the treatment of MPS II. Thousands of patients have been treated with REGENXBIO’s AAV Therapeutic platform, including Novartis’ ZOLGENSMA for children with spinal muscular atrophy. Designed to be one-time treatments, AAV Therapeutics have the potential to change the way healthcare is delivered for millions of people. For more information, please visit www.regenxbio.com . SOURCE: REGENXBIO

Company remains on track for its first BLA filing in 2024 and is accelerating progress toward pivotal trial initiation for Duchenne (H2 2024) and diabetic retinopathy (H1 2025) New, positive data from Phase II AFFINITY DUCHENNE® trial of RGX-202 demonstrates consistent high expression of microdystrophin across treated patients in all age groups Successful End-of-Phase II meeting with FDA for RGX-202 supports plans for using the accelerated approval pathway and pivotal initiation in Q4 2024 End-of-Phase II meeting for ABBV-RGX-314 for diabetic retinopathy accelerated to Q4 2024 to support global pivotal program initiation in H1 2025 $327 million in cash, cash equivalents and marketable securities as of June 30, 2024, expected to fund operational runway into 2026 Conference call Thursday, August 1, at 4:30 p.m. ET ROCKVILLE, Md., Aug. 1, 2024 /PRNewswire/ -- REGENXBIO Inc. (Nasdaq: RGNX) today announced financial results for the second quarter ending June 30, 2024. Recent operational highlights, including acceleration of the late-stage pipeline, support meaningful value generation from the Company's leading portfolio of AAV Therapeutics. "In the first half of 2024, REGENXBIO has made remarkable progress in accelerating and advancing the development of AAV Therapeutics that are well-positioned to make a profound impact for patients," said Curran M. Simpson, President and Chief Executive Officer of REGENXBIO. "Looking ahead, we have multiple, exciting catalysts across our pipeline, including enrolling our first patient aged 1-3 in the AFFINITY DUCHENNE® trial and advancing RGX-202 into pivotal stage to address the significant ongoing unmet need in this community, initiating a rolling BLA for RGX-121 as the only one-time treatment for Hunter syndrome, and accelerating our End-of-Phase II meeting with the FDA for ABBV-RGX-314 in diabetic retinopathy. Each of these programs represent differentiated therapies that we expect will drive significant value." PROGRAM HIGHLIGHTS AND MILESTONES Neuromuscular Disease: RGX-202 is an investigational one-time AAV Therapeutic designed to deliver a novel microdystrophin gene for improved function and outcomes in Duchenne. REGENXBIO recently announced new, positive data from two patients treated with dose level 2 (DL2), demonstrating consistent, high microdystrophin expression across treated patients in the Phase II AFFINITY DUCHENNE® trial of RGX-202. In patients aged 5.8 and 8.5 at dosing, RGX-202 microdystrophin expression was measured to be 77.2%, and 46.5%, respectively, compared to control at three months. As of July 8, 2024, RGX-202 has been well tolerated with no serious adverse events. All seven patients who completed three-month trial assessments indicate meaningful increases in expression of RGX-202 microdystrophin and reduction from baseline in serum creatinine kinase levels, supporting evidence of clinical improvement. REGENXBIO expects to complete enrollment in the DL2 expansion cohort in early Q3 2024 and has initiated enrollment in the cohort for boys aged 1-3. The Company remains on track to share initial strength and functional assessment data for both dose levels of the AFFINITY DUCHENNE trial in the second half of 2024. REGENXBIO recently held a successful End-of-Phase II (EOP2) meeting with the FDA and is moving forward with plans to initiate a pivotal trial in Q4 2024. Discussions with the FDA continue to support use of microdystrophin as a surrogate endpoint reasonably likely to predict clinical benefit for accelerated approval. The Company expects to share the pivotal trial design in late Q3 to early Q4 2024. RGX-202 is manufactured using REGENXBIO's proprietary, high-yielding NAVXpress™ platform process. This suspension-based manufacturing process has demonstrated scalability up to 2,000L with consistent yield and product purity. The REGENXBIO Manufacturing Innovation Center has the capacity and yields to produce up to 2,500 doses of RGX-202 per year to support future commercialization. Retinal Disease: ABBV-RGX‑314, being developed in collaboration with AbbVie, is a potential one-time treatment for chronic retinal conditions, including wet age-related macular degeneration (wet AMD), diabetic retinopathy (DR) and diabetic macular edema (DME). ABBV-RGX-314 Suprachoroidal Delivery for Treatment of DR Based on positive interim results from the Phase II ALTITUDE® trial to date, the design and evaluation of two pivotal trials is on-going. With AbbVie, REGENXBIO has accelerated a planned EOP2 meeting with the FDA, now expected in Q4 2024. The Company expects to initiate the first global pivotal trial in the first half of 2025. The ALTITUDE trial is now enrolling a new cohort of patients with center-involved diabetic macular edema (DME). Patients will receive a one-time, in-office injection of ABBV-RGX-314 at dose level 4 (1.5x10e12 GC/eye) with short course prophylactic steroid eye drops. DME is a vision-threatening complication of diabetic retinopathy; an estimated 34 million people globally have DME. ABBV-RGX-314 Subretinal Delivery for the Treatment of Wet AMD Enrollment is on track in the ATMOSPHERE® and ASCENT™ pivotal trials and these trials are expected to support global regulatory submissions with the FDA and European Medicines Agency in the first half of 2026. The open label fellow eye study evaluating ABBV-RGX-314 in patients treated in the subretinal Phase I/IIa study is now fully enrolled. This study is designed to monitor safety, immune responses, and efficacy of ABBV-RGX-314 treatment in the fellow eye and these study data are intended to support the inclusion of bilateral use in the product label. Bilateral disease impacts a significant number of patients with wet AMD. ABBV-RGX-314 Suprachoroidal Delivery for Treatment of Wet AMD As of July 29, 2024, ABBV-RGX-314 at dose level 3 with short course prophylactic steroid eye drops continues to be well tolerated with no drug-related SAEs and no cases of intraocular inflammation, endophthalmitis, vasculitis, retinal artery occlusion, choroidal effusion, or hypotony. Mild episcleritis occurred in 3 patients, all resolved and completed treatment with topical steroids. There were no cases of elevated intraocular pressure. Based on this favorable safety profile and to evaluate dose levels for a planned pivotal program, the Phase II AAVIATE® trial is initiating enrollment in a new cohort to evaluate ABBV-RGX-314 at dose level 4 (1.5x10e12 GC/eye). Patients in this cohort will also receive short course prophylactic steroid eye drops. Neurodegenerative Disease: RGX-121 is a potential one-time AAV Therapeutic for the treatment of boys with MPS II. REGENXBIO completed a successful pre-BLA meeting with the FDA and will initiate a rolling BLA submission using the accelerated approval pathway in Q3 2024, potentially making RGX-121 the first approved gene therapy and one-time treatment for MPS II. REGENXBIO expects to share additional safety and efficacy data from the Phase I/II/III CAMPSIITE® trial in the second half of 2024. Approval of the planned BLA could result in receipt of a Priority Review Voucher in 2025. FINANCIAL RESULTS Cash Position: Cash, cash equivalents and marketable securities were $327.3 million as of June 30, 2024, compared to $314.1 million as of December 31, 2023. The increase was primarily attributable to $131.1 million of aggregate net proceeds received from the follow-on public offering of the Company's common stock and pre-funded warrants completed in March 2024, and was partially offset by cash used to fund operating activities during the first half of 2024. Revenues: Revenues were $22.3 million for the three months ended June 30, 2024, compared to $20.0 million for the three months ended June 30, 2023. The increase was primarily attributable to Zolgensma® royalty revenues, which increased from $19.0 million for the second quarter of 2023 to $21.8 million for the second quarter of 2024. Research and Development Expenses: Research and development expenses were $48.9 million for the three months ended June 30, 2024, compared to $59.9 million for the three months ended June 30, 2023. The decrease was largely driven by manufacturing and clinical supply costs for ABBV-RGX-314 and RGX-202, and personnel-related costs as a result of reduced headcount. The decrease was partially offset by increases in clinical trial expenses for ABBV-RGX-314 and RGX-202. General and Administrative Expenses: General and administrative expenses were $18.9 million for the three months ended June 30, 2024, compared to $23.7 million for the three months ended June 30, 2023. The decrease was primarily attributable to expenses for professional services and other corporate overhead costs. Net Loss: Net loss was $53.0 million, or $1.05 basic and diluted net loss per share, for the three months ended June 30, 2024, compared to a net loss of $72.1 million, or $1.66 basic and diluted net loss per share, for the three months ended June 30, 2023. FINANCIAL GUIDANCE REGENXBIO expects its balance in cash, cash equivalents and marketable securities of $327.3 million as of June 30, 2024 to fund its operations into 2026. This cash runway guidance is based on the Company's current operational plans and excludes the impact of any payments that may be received from AbbVie upon the achievement of development or commercial milestones under our ABBV-RGX-314 collaboration (including a potential, one-time $200.0 million milestone for achievement of first patient dosed in the first pivotal trial for suprachoroidal delivery for treatment of DR) and the potential monetization of a priority review voucher that may be received for RGX-121. CONFERENCE CALL In connection with this announcement, REGENXBIO will host a conference call and webcast today at 4:30 p.m. ET. To access the live call by phone, dial (646) 307-1963 (domestic) or (800) 715-9871 (international) and enter the passcode 4849384. To access a live or recorded webcast of the call, please visit the Investors section of the REGENXBIO website at . The recorded webcast will be available for approximately 30 days following the call. Those who plan on participating are advised to join 15 minutes prior to the start time. ABOUT REGENXBIO Inc. REGENXBIO is a leading clinical-stage biotechnology company seeking to improve lives through the curative potential of gene therapy. Since its founding in 2009, REGENXBIO has pioneered the development of AAV Therapeutics, an innovative class of gene therapy medicines. REGENXBIO is advancing a pipeline of AAV Therapeutics for retinal and rare diseases, including ABBV-RGX-314 for the treatment of wet AMD and diabetic retinopathy, being developed in collaboration with AbbVie, RGX-202 for the treatment of Duchenne and RGX-121 for the treatment of MPS II. Thousands of patients have been treated with REGENXBIO's AAV Therapeutic platform, including Novartis' ZOLGENSMA® for children with spinal muscular atrophy. Designed to be one-time treatments, AAV Therapeutics have the potential to change the way healthcare is delivered for millions of people. For more information, please visit . FORWARD-LOOKING STATEMENTS This press release includes "forward-looking statements," within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements express a belief, expectation or intention and are generally accompanied by words that convey projected future events or outcomes such as "believe," "may," "will," "estimate," "continue," "anticipate," "assume," "design," "intend," "expect," "could," "plan," "potential," "predict," "seek," "should," "would" or by variations of such words or by similar expressions. The forward-looking statements include statements relating to, among other things, REGENXBIO's future operations, clinical trials, costs and cash flow. REGENXBIO has based these forward-looking statements on its current expectations and assumptions and analyses made by REGENXBIO in light of its experience and its perception of historical trends, current conditions and expected future developments, as well as other factors REGENXBIO believes are appropriate under the circumstances. However, whether actual results and developments will conform with REGENXBIO's expectations and predictions is subject to a number of risks and uncertainties, including the timing of enrollment, commencement and completion and the success of clinical trials conducted by REGENXBIO, its licensees and its partners, the timing of commencement and completion and the success of preclinical studies conducted by REGENXBIO and its development partners, the timing or likelihood of payments from AbbVie, the monetization of any priority review voucher, the timely development and launch of new products, the ability to obtain and maintain regulatory approval of product candidates, the ability to obtain and maintain intellectual property protection for product candidates and technology, trends and challenges in the business and markets in which REGENXBIO operates, the size and growth of potential markets for product candidates and the ability to serve those markets, the rate and degree of acceptance of product candidates, and other factors, many of which are beyond the control of REGENXBIO. Refer to the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of REGENXBIO's Annual Report on Form 10-K for the year ended December 31, 2023, and comparable "risk factors" sections of REGENXBIO's Quarterly Reports on Form 10-Q and other filings, which have been filed with the U.S. Securities and Exchange Commission (SEC) and are available on the SEC's website at . All of the forward-looking statements made in this press release are expressly qualified by the cautionary statements contained or referred to herein. The actual results or developments anticipated may not be realized or, even if substantially realized, they may not have the expected consequences to or effects on REGENXBIO or its businesses or operations. Such statements are not guarantees of future performance and actual results or developments may differ materially from those projected in the forward-looking statements. Readers are cautioned not to rely too heavily on the forward-looking statements contained in this press release. These forward-looking statements speak only as of the date of this press release. Except as required by law, REGENXBIO does not undertake any obligation, and specifically declines any obligation, to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. Zolgensma® is a registered trademark of Novartis Gene Therapies. All other trademarks referenced herein are registered trademarks of REGENXBIO. CONTACTS: Dana Cormack Corporate Communications [email protected] Chris Brinzey, ICR Westwicke 339-970-2843 [email protected] SOURCE REGENXBIO Inc.