Exhibit 99.1

MeiraGTx Reports Fourth Quarter and Full Year 2023 Financial and Operational Results and Recent Business Updates

LONDON and NEW YORK, March 14, 2024 (GLOBE NEWSWIRE) -- MeiraGTx Holdings plc (Nasdaq: MGTX), a vertically integrated, clinical stage gene therapy company, today announced financial and operational results for the fourth quarter and full-year ended December 31, 2023, and provided a corporate update.

“We are very pleased with the progress made at MeiraGTx in the past year across every area of the company, as well as the two transactions that we executed in the fourth quarter of 2023, bolstering our balance sheet. We advanced each of our three lead clinical programs, and we now have three studies in late-stage clinical development. For our program for radiation-induced xerostomia, we presented unprecedented positive data from our Phase 1 AQUAx study in June 2023; we opened the Phase 2 AQUAx2 study mid-year 2023, a randomized, double-blind placebo-controlled study of AAV-hAQP1, and last month we aligned with the FDA on the requirements for this Phase 2 study to be pivotal supporting a potential BLA. This is a

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completely transformative treatment for this large addressable patient population, and we are excited to have the opportunity to expedite the development of this therapy for these patients who currently have no options for treatment. In addition, the data from our Phase 1 AQUAx study will be presented at an oral session at AAOM next month,” said Alexandria Forbes, Ph.D., president and chief executive officer of MeiraGTx.

Dr. Forbes continued, “In the area of ophthalmology, in the third quarter of 2023, we completed enrollment in the large multi-center Phase 3 study of bota-vec for XLRP-RPGR in collaboration with Janssen. Data from this global pivotal study is expected after the third quarter of 2024. Additionally, in the retinal disease space, we recently received data from our ongoing compassionate use program under a Specials License for children with LCA4 due to mutations in the AIPL1 gene. MeiraGTx developed and optimized the AAV-AIPL1 vector and manufactured it in-house at our London facility, which we believe is the only viral vector manufacturing facility with a Specials License under the UK Medicines and Healthcare products Regulatory Agency (MHRA) regulations. Manufacturing at our site under the Specials License allows this material to be supplied and delivered to patients at UK hospitals, with 8 LCA4 children ages 1 to 3 years old having been treated to date. The responses seen in each of these children have been remarkable, and we are now moving forward with regulators to expedite access to this transformative treatment to patients globally.”

Professor Michel Michaelides, Consultant Ophthalmologist at Moorfields Eye Hospital (MEH) in the Departments of Inherited Eye Disease, Medical Retina, and Paediatric Ophthalmology involved in the treatment of these LCA4 children said, “The improvements in vision have been incredible. Children with AIPL1-LCA are legally blind from birth, generally with light perception only. Of the 8 children who have received treatment to date, all 8 have developed vision-guided behaviour with recordable visual acuities - something that never happens during the natural history of this inexorably progressive disease. Improvements of this magnitude, in one of the severest congenital onset retinal dystrophies, are life changing.”

Dr. Forbes continued, “In addition, we have completed the bridging safety study of our AAV-GAD product candidate for Parkinson’s disease, allowing us to move forward towards a pivotal study in patients who no longer respond adequately to dopamine. All of our clinical programs are supported by our leading end-to-end manufacturing capabilities and infrastructure. We have internalized plasmid production, we have two flexible, scalable viral vector production facilities fit for commercial supply, and a QC testing facility which has now received both commercial and clinical licenses from the Irish Health Products Regulatory Authority (HPRA). We have manufactured multiple capsids and vector genomes using our proprietary platform process with both yield and full ratios at the top end of published industry standards. We have had iterative feedback from the FDA and 15 other global regulators on our manufacturing capabilities for commercial supply and as a result, we are in a position to now initiate INDs using material that is fit for commercial supply, therefore avoiding many years of potential development timeline delays. This reduces our development timelines and significantly reduces costs, decreasing risk and increasing the value of each of our programs. We also entered into a commercial manufacturing supply agreement for bota-vec with Janssen in the fourth quarter of 2023 and we continue to attract interest across the board in our CMC capabilities from potential strategic partners and collaborators.”

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“Finally, we are most excited by the incredible progress we have made in moving our riboswitch gene regulation technology platform towards the clinic. We are focusing on two areas initially, cell therapy and metabolic disease, where our pre-clinical data in vivo has been quite remarkable. We look forward to presenting this data in an R&D day later this year. In the area of metabolic disease, we have successfully delivered multiple combinations of gut peptides in vivo, including GLP-1, GIP, PYY, Glucagon and Amylin, as well as novel peptides that drive muscle metabolism, via the riboswitch platform that allows daily dosing with a small molecule to activate physiologically relevant levels and combinations of peptides within the body. This provides a platform for addressing not just weight loss via reduced appetite but also muscle strength, fat metabolism and cardiovascular health in metabolic disease, with daily oral small molecules. This is one of the broad areas of interest in our Sanofi relationship which we entered into during the fourth quarter of 2023.”

Recent Development Highlights and Anticipated 2024 Milestones

AAV-hAQP1 for the Treatment of Grade 2/3 Radiation-Induced Xerostomia:

Grade 2/3 radiation-induced xerostomia (RIX) is a severely debilitating consequence of radiation treatment for head and neck cancer that affects approximately 30-40% of all patients treated with radiation for head and neck cancer. This is a completely unmet need with no treatment options, and a large addressable market with over 170,000 patients currently in the U.S., and an additional 15,000 new patients in the U.S. each year. Treatment with AAV-hAQP1 involves a small dose locally delivered to the salivary gland via a non-invasive procedure, that can be delivered in a dental office or oncology center where these patients are seen at least annually following radiation treatment. The small local dose of AAV-hAQP1 manufactured in-house at MeiraGTx allows for a low cost of goods, and the potential long term durability and ease of delivery make this large addressable market a compelling commercial opportunity.

Title: Results of a Phase 1, Open-label, Dose-escalation Study of Gene Therapy with AAV2-hAQP1 as Treatment for Grade 2 and 3 Radiation-induced Late Xerostomia and Parotid Gland Hypofunction

ID: 196

AAV-AIPL1 Specials License in UK:

LCA4 is an ultra rare and severe inherited retinal disease (IRD) resulting from mutations in the

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aryl hydrocarbon receptor interacting protein-like 1 gene (AIPL1). Children with LCA4 are blind from birth due to the absence of AIPL1, a retinal photoreceptor-specific protein expressed in cones and rods. By the age of 4 years old, retinal degeneration is complete. MeiraGTx has developed AAV-AIPL1 to deliver the AIPL1 gene to the retina of children with LCA4. This product candidate, manufactured at MeiraGTx’s London facility, is available for treatment of children with LCA4 under a Specials License from the MHRA.

AAV-GAD for the Treatment of Parkinson’s Disease:

Parkinson’s is the second most common neurodegenerative disease after Alzheimer’s with approximately 90,000 patients diagnosed annually in the U.S. Most Parkinson’s patients respond to dopamine replacement therapy, however, after about 5 years even higher doses of dopamine no longer manage the motor symptoms of the disease, leaving little effective treatment for this large population of patients. One treatment that has efficacy in this patient population is deep brain stimulation (DBS), which requires multiple surgeries and in-dwelling hardware with onerous safety and tolerability issues. In contrast, MeiraGTx’s gene therapy treatment for Parkinson’s involves the delivery of a very small dose of AAV-GAD encoding the enzyme that converts the activating neurotransmitter glutamate to the calming neurotransmitter GABA, to the specific nucleus of the brain targeted by DBS. We have demonstrated that localized treatment with AAV-GAD leads to a change in circuitry to the motor cortex which results in alleviation of motor symptoms. This is a one-time treatment, involving no in-dwelling hardware or subsequent tuning, no off target side effects, and with a small dose of viral vector that has a low cost of goods.

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Riboswitch Gene Regulation Technology Platform:

MeiraGTx’s riboswitch technology allows for repeatable, long-term delivery of any messenger RNA (mRNA) from the DNA template encoding any peptide or protein on stimulation by bespoke orally delivered small molecules.

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Asset Purchase Agreement with Jannsen:

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Strategic Investment from Sanofi:

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End-to-End Manufacturing Infrastructure:

MeiraGTx has comprehensive end-to end-manufacturing capabilities with a commercial ready platform process and GMP-licensed manufacturing and QC facilities in both the UK and Ireland, comprising the following:

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As of December 31, 2023, MeiraGTx had cash and cash equivalents of approximately $129.6 million. In addition, the Company received a milestone payment of $50.0 million in the first quarter of 2024 from Janssen in connection with the asset purchase agreement and expects to receive $10.1 million from receivables which is expected to be collected in the first quarter of 2024 from Jannsen in connection with the collaboration agreement. The Company believes that with such funds, as well as anticipated near-term milestones from Janssen under the asset purchase agreement, it will have sufficient capital to fund operating expenses and capital expenditure requirements into the first quarter of 2026. This estimate does not include the $285.0 million in milestones the Company is eligible to receive under the asset purchase agreement upon first commercial sale of bota-vec in the United States and in at least one of the United Kingdom, France, Germany, Spain and Italy, for completion of the transfer of certain manufacturing technology to Janssen and upon regulatory approval of a Janssen-selected manufacturing facility in each of the United States and European Union for commercial manufacture of bota-vec.

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For more information related to our clinical trials, please visit www.clinicaltrials.gov

Financial Results

Cash, cash equivalents and restricted cash were $130.6 million as of December 31, 2023, compared to $115.5 million as of December 31, 2022.

License revenue was $14.0 million for the year ended December 31, 2023, compared to $15.9 million for the year ended December 31, 2022. This decrease is a result of MeiraGTx recognizing the deferred revenue progress of the $100.0 million upfront payment and the $30.0 million milestone payment received in connection with the Janssen collaboration agreement through the termination date of the Janssen collaboration agreement on December 20, 2023.

General and administrative expenses were $47.3 million for the year ended December 31, 2023, compared to $46.6 million for the year ended December 31, 2022. The increase of $0.7 million was primarily due to an increase in legal and accounting fees, payroll and payroll-related costs, share-based compensation and rent and facilities costs, which was partially offset by decreases in other general and administrative costs, insurance, consulting fees and depreciation.

Research and development expenses were $103.8 million for the year ended December 31, 2023, compared to $85.7 million for the year ended December 31, 2022. The increase of $18.0 million was primarily due to an increase in clinical trial expenses primarily related to our bota-vec and AAV-hAQP1 programs, manufacturing costs, other research and development expenses and a decrease in research funding provided under the Janssen collaboration agreement. These increases were partially offset by decreases in expenses related to our preclinical programs primarily related to preclinical ocular diseases.

Foreign currency gain was $9.3 million for the year ended December 31, 2023, compared to a loss of $9.5 million for the year ended December 31, 2022. The change of $18.8 million was primarily due to the strengthening of the U.S. dollar against the pound sterling and euro during the year ended December 31, 2023 as it relates to the valuation of our intercompany payables and receivables.

Interest income was $2.3 million for the year ended December 31, 2023, compared to $0.8 million for the year ended December 31, 2022. The increase was due to higher interest rates and cash balances during 2023.

Interest expense was $13.2 million for the year ended December 31, 2023, compared to $4.9 million for the year ended December 31, 2022. The increase was primarily due to the interest expense and amortization of the debt discount in connection with the Company’s outstanding debt. Twelve months of interest was recorded during the year ended December 31, 2023 compared to five months of interest recorded during the year ended December 31, 2022.

Gain on sale of nonfinancial assets was $54.2 million for the year ended December 31, 2023 compared to $0 for the year ended December 31, 2022. This increase was a result of the recognition of the value allocated to the nonfinancial assets sold and assigned to Janssen including a License Agreement between the Company and UCL Business Plc (now UCL

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Business Ltd.) relating to the research, development, manufacture and exploitation of bota-vec, and other related assets pursuant to the asset purchase agreement, net of carrying value.

Net loss attributable to ordinary shareholders for the year ended December 31, 2023, was $84.0 million, or $1.49 basic and diluted net loss per ordinary share, compared to a net loss attributable to ordinary shareholders of $129.6 million, or $2.87 basic and diluted net loss per ordinary share for the year ended December 31, 2022.

About MeiraGTx

MeiraGTx (Nasdaq: MGTX) is a vertically integrated, clinical-stage gene therapy company with a broad pipeline of late-stage clinical programs supported by end-to-end manufacturing capabilities. MeiraGTx has an internally developed manufacturing platform process, internal plasmid production for GMP, two GMP viral vector production facilities as well as an in-house Quality Control hub for stability and release, all fit for IND through commercial supply. MeiraGTx has core capabilities in viral vector design and optimization and a potentially transformative riboswitch gene regulation platform technology that allows for the precise, dose-responsive control of gene expression by oral small molecules. MeiraGTx is focusing the riboswitch platform on delivery of metabolic peptides including GLP-1, GIP, Glucagon and PYY using oral small molecules, as well as cell therapy for oncology and autoimmune diseases. Although initially focusing on the eye, central nervous system, and salivary gland, MeiraGTx has developed the technology to apply genetic medicine to more common diseases, increasing efficacy, addressing novel targets, and expanding access in some of the largest disease areas where the unmet need remains great.

For more information, please visit www.meiragtx.com

Forward Looking Statement

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, without limitation, statements regarding our product candidate development, our ability to manufacture product candidates, potential milestone payments and the achievement of such milestones, including the receipt of such milestone payments and the impact on our cash runway, and our pre-clinical and clinical data, reporting of such data and the timing of results of data and regulatory matters, as well as statements that include the words “expect,” “will,” “intend,” “plan,” “believe,” “project,” “forecast,” “estimate,” “may,” “could,” “should,” “would,” “continue,” “anticipate” and similar statements of a future or forward-looking nature. These forward-looking statements are based on management’s current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause 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, our incurrence of significant losses; any inability to achieve or maintain profitability, raise additional capital, repay our debt obligations, identify additional and develop existing product candidates, successfully execute strategic transactions or priorities, bring product candidates to market, expansion of our manufacturing facilities and processes, successfully enroll patients in and complete clinical trials, accurately predict growth assumptions, recognize benefits of any orphan

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drug designations, retain key personnel or attract qualified employees, or incur expected levels of operating expenses; the impact of pandemics, epidemics or outbreaks of infectious diseases on the status, enrollment, timing and results of our clinical trials and on our business, results of operations and financial condition; failure of early data to predict eventual outcomes; failure to obtain FDA or other regulatory approval for product candidates within expected time frames or at all; the novel nature and impact of negative public opinion of gene therapy; failure to comply with ongoing regulatory obligations; contamination or shortage of raw materials or other manufacturing issues; changes in healthcare laws; risks associated with our international operations; significant competition in the pharmaceutical and biotechnology industries; dependence on third parties; risks related to intellectual property; changes in tax policy or treatment; our ability to utilize our loss and tax credit carryforwards; litigation risks; and the other important factors discussed under the caption “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2023, as such factors may be updated from time to time in our other filings with the SEC, which are accessible on the SEC’s website at www.sec.gov. These and other important factors 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, unless required by law, we disclaim any obligation to do so, even if subsequent events cause our views to change. Thus, one should not assume that our silence over time means that actual events are bearing out as expressed or implied in such forward-looking statements. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this press release.

Contacts

Investors:

MeiraGTx

Investors@meiragtx.com

or

Media:

Jason Braco, Ph.D.

LifeSci Communications

jbraco@lifescicomms.com

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MEIRAGTX HOLDINGS PLC AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

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MEIRAGTX HOLDINGS PLC AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

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