# EDGAR Filing Document

**Accession Number:** 0001735438
**File Stem:** 0001104659-26-044464
**Filing Date:** 2026-4
**Character Count:** 185126
**Document Hash:** f9d82a3b063b9ab3914bdb212038725a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-044464.hdr.sgml**: 20260416

**ACCESSION NUMBER**: 0001104659-26-044464

**CONFORMED SUBMISSION TYPE**: 424B5

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260416

**DATE AS OF CHANGE**: 20260416

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MeiraGTx Holdings plc
- **CENTRAL INDEX KEY:** 0001735438
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 981448305
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 424B5
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-276183
- **FILM NUMBER:** 26868603

**BUSINESS ADDRESS:**
- **STREET 1:** 655 THIRD AVENUE
- **STREET 2:** SUITE 1115
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10017
- **BUSINESS PHONE:** 646-860-7985

**MAIL ADDRESS:**
- **STREET 1:** 655 THIRD AVENUE
- **STREET 2:** SUITE 1115
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10017

[**TABLE OF CONTENTS**](#TOC)

#### Registration No. 333-276183 Filed Pursuant to Rule 424(b)(5)

#### PROSPECTUS SUPPLEMENT (To Prospectus dated December 29, 2023)

### 11,111,111
![[MISSING IMAGE: lg_meiragtx-4c.jpg]](lg_meiragtx-4c.jpg)

### Ordinary Shares
We are offering 11,111,111 of our ordinary shares, nominal value $0.00003881 per ordinary share.

Our ordinary shares are listed on the Nasdaq Global Select Market under the symbol "MGTX." On April 15, 2026, the last reported sale price of our ordinary shares on the Nasdaq Global Select Market was $11.25 per ordinary share.

We are a "smaller reporting company" under applicable Securities and Exchange Commission rules and, as such, have elected to comply with certain reduced public company disclosure requirements for this prospectus and future filings. See "Prospectus Summary — Implications of Being a Smaller Reporting Company."

 ***Investing in our ordinary shares involves risk. See "Risk Factors" on page [S-6](#RIFA) of this prospectus supplement, on page [6](#tRIFA) of the accompanying base prospectus and our filings with the Securities and Exchange Commission, or the SEC, that are incorporated by reference herein and therein to read about factors you should consider before investing in our ordinary shares.***

---

| | | |
|:---|:---|:---|
| | **Per Share**  | **Total**  |
| Offering price  | $9.00 | $99999999.00 |
| Underwriting discounts and commissions<sup>(1)</sup>  | $0.54 | $5999999.94 |
| Proceeds, before expenses, to us  | $8.46 | $93999999.06 |

---

(1) We refer you to "Underwriting" beginning on page S-20 for additional information regarding underwriting compensation.

 **Neither the SEC nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.** 

The ordinary shares will be ready for delivery on or about April 17, 2026.

 *Joint Book-Running Managers* 

### BofA Securities Goldman Sachs & Co. LLC
 *Co-Manager* 

### Raymond James

#### The date of this prospectus supplement is April 16, 2026.

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#### **TABLE OF CONTENTS**

---

| | |
|:---|:---|
| | **Page**  |
| **PROSPECTUS SUPPLEMENT** | |
| [ABOUT THIS PROSPECTUS SUPPLEMENT](#ATPS)  | [S-1](#ATPS) |
| [WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE](#WYCF)  | [S-2](#WYCF) |
| [SUMMARY](#SUM)  | [S-4](#SUM) |
| [THE OFFERING](#THOF)  | [S-5](#THOF) |
| [RISK FACTORS](#RIFA)  | [S-6](#RIFA) |
| [CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS](#CNRF)  | [S-7](#CNRF) |
| [USE OF PROCEEDS](#UOP)  | [S-8](#UOP) |
| [DIVIDEND POLICY](#DIPO)  | [S-9](#DIPO) |
| [DILUTION](#DIL)  | [S-10](#DIL) |
| [MATERIAL CAYMAN ISLANDS TAX CONSIDERATIONS](#MCIT)  | [S-11](#MCIT) |
| [MATERIAL UNITED KINGDOM TAX CONSIDERATIONS](#MUKT)  | [S-12](#MUKT) |
| [MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO U.S. HOLDERS](#MUFI)  | [S-15](#MUFI) |
| [UNDERWRITING](#UND)  | [S-20](#UND) |
| [LEGAL MATTERS](#LEMA)  | [S-27](#LEMA) |
| [EXPERTS](#EXP)  | [S-27](#EXP) |

---

---

| | |
|:---|:---|
| | **Page**  |
| **PROSPECTUS** | |
| [ABOUT THIS PROSPECTUS](#tATP)  | [1](#tATP) |
| [SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS](#tSNRF)  | [2](#tSNRF) |
| [WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE](#tWYCF)  | [3](#tWYCF) |
| [PROSPECTUS SUMMARY](#tPRSU)  | [5](#tPRSU) |
| [RISK FACTORS](#tRIFA)  | [6](#tRIFA) |
| [USE OF PROCEEDS](#tUOP)  | [7](#tUOP) |
| [DESCRIPTION OF SHARE CAPITAL](#tDOSC)  | [8](#tDOSC) |
| [DESCRIPTION OF WARRANTS](#tDOW)  | [16](#tDOW) |
| [DESCRIPTION OF PURCHASE CONTRACTS](#tDOPC)  | [17](#tDOPC) |
| [DESCRIPTION OF UNITS](#tDOU)  | [18](#tDOU) |
| [GLOBAL SECURITIES](#tGLSE)  | [19](#tGLSE) |
| [PLAN OF DISTRIBUTION](#tPOD)  | [23](#tPOD) |
| [LEGAL MATTERS](#tLEMA)  | [25](#tLEMA) |
| [EXPERTS](#tEXP)  | [25](#tEXP) |

---

S-i

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[**TABLE OF CONTENTS**](#TOC)

#### ABOUT THIS PROSPECTUS SUPPLEMENT
This prospectus supplement is part of a registration statement that we have filed with the SEC utilizing a "shelf" registration process, and relates to the offering of our ordinary shares. Before buying any of the ordinary shares that we are offering, we urge you to carefully read this prospectus supplement, the accompanying base prospectus and all of the information incorporated by reference herein and therein, as well as the additional information described under the heading "Where You Can Find More Information; Incorporation by Reference" in this prospectus supplement. These documents contain important information that you should consider when making your investment decision.

We provide information to you about this offering of our ordinary shares in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering; and (2) the accompanying base prospectus, which provides general information, some of which may not apply to this offering. Generally, when we refer to this "prospectus," we are referring to both documents combined. If information in this prospectus supplement is inconsistent with the accompanying base prospectus, you should rely on this prospectus supplement. To the extent there is a conflict between the information contained in this prospectus supplement, on the one hand, and the information contained in any document incorporated by reference in this prospectus supplement, on the other hand, you should rely on the information in this prospectus supplement. If any statement in one of these documents is inconsistent with a statement in another document having a later date — for example, a document incorporated by reference in this prospectus supplement — the statement in the document having the later date modifies or supersedes the earlier statement.

Neither we nor the underwriters have authorized anyone to provide any information or make any representations other than those contained or incorporated by reference in this prospectus supplement, the accompanying prospectus or any free writing prospectus that we have authorized for use in connection with this offering. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. Neither we nor any of the underwriters are making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation. You should assume that the information appearing in this prospectus supplement, the accompanying base prospectus, the documents incorporated by reference herein and therein and any free writing prospectus that we have authorized for use in connection with this offering, is accurate only as of the date of those respective documents. Our business, financial condition, results of operations and prospects may have changed since those dates. You should read this prospectus supplement, the accompanying base prospectus, the documents incorporated by reference herein and therein and any free writing prospectus that we have authorized for use in connection with this offering, in their entirety before making an investment decision.

We are offering to sell, and seeking offers to buy, ordinary shares only in jurisdictions where offers and sales are permitted. The distribution of this prospectus supplement and the offering of the ordinary shares in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement must inform themselves about, and observe any restrictions relating to, the offering of the ordinary shares and the distribution of this prospectus supplement outside the United States. This prospectus supplement does not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, any securities offered by this prospectus supplement by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation.

Unless the context otherwise requires, references in this prospectus supplement and the accompanying base prospectus to "Meira," "MeiraGTx," "we," "us", "our" or "the Company" refer to MeiraGTx Holdings plc and its subsidiaries.

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#### WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE

#### Available Information
We file reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information about issuers, such as us, who file electronically with the SEC. The address of that website is *www.sec.gov*.

Our website address is *www.meiragtx.com*. The information on our website, however, is not, and should not be deemed to be, a part of this prospectus supplement and the accompanying base prospectus.

This prospectus supplement and the accompanying base prospectus are part of a registration statement that we filed with the SEC and do not contain all of the information in the registration statement. The full registration statement may be obtained from the SEC or us, as provided below. Forms of the documents establishing the terms of the offered securities are or may be filed as exhibits to the registration statement or documents incorporated by reference in the registration statement. Statements in this prospectus supplement or any accompanying base prospectus about these documents are summaries and each statement is qualified in all respects by reference to the document to which it refers. You should refer to the actual documents for a more complete description of the relevant matters. You may inspect a copy of the registration statement through the SEC's website, as provided above.

#### Incorporation by Reference
The SEC's rules allow us to "incorporate by reference" information in this prospectus supplement and the accompanying base prospectus, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference herein is deemed to be part of this prospectus supplement and the accompanying base prospectus, and subsequent information that we file with the SEC will automatically update and supersede that information. Any statement contained in a previously filed document incorporated by reference will be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained in this prospectus supplement modifies or replaces that statement.

We incorporate by reference our documents listed below and any future filings made by us with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, between the date of this prospectus supplement and the termination or completion of the offering of the securities described in this prospectus supplement. We are not, however, incorporating by reference any documents or portions thereof, whether specifically listed below or filed in the future, that are not deemed "filed" with the SEC, including any information furnished pursuant to Items 2.02 or 7.01 of Form 8-K or related exhibits furnished pursuant to Item 9.01 of Form 8-K.

This prospectus supplement and accompanying base prospectus incorporate by reference the documents set forth below that have previously been filed with the SEC (other than those documents or the portions of those documents not deemed to be filed):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • [Our Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on March 30, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926036494/mgtx-20251231x10k.htm).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • The information specifically incorporated by reference into our [Annual Report on Form 10-K for the year ended December 31, 2024](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837025002867/mgtx-20241231x10k.htm) from our [Definitive Proxy Statement on Schedule 14A, filed with the SEC on April 30, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837025005929/mgtx-20250612xdef14a.htm).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • The information specifically incorporated by reference in our Current Reports on Form 8-K, filed with the SEC on [January 2, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926000068/mgtx-20251231x8k.htm), [March 26, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926034904/mgtx-20260325x8k.htm), [April 16, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926044025/mgtx-20260416x8k.htm) and [April 16, 2026](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926044028/mgtx-20260415x8k.htm).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • The description of our ordinary shares contained in our Registration Statement on [Form 8-A, dated June 8, 2018](https://www.sec.gov/Archives/edgar/data/1735438/000119312518187284/d602941d8a12b.htm), [filed with the SEC on June 8, 2018](https://www.sec.gov/Archives/edgar/data/1735438/000119312518187284/d602941d8a12b.htm) and any amendment or report filed with the SEC for the purpose of updating the description.

All reports and other documents we subsequently file pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the termination of this offering, including all such documents we may file with

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the SEC after the date of the initial registration statement and prior to the effectiveness of the registration statement, but excluding any information furnished to, rather than filed with, the SEC, will also be incorporated by reference into this prospectus supplement and accompanying base prospectus and deemed to be part of this prospectus from the date of the filing of such reports and documents.

You may request a free copy of any of the documents incorporated by reference in this prospectus supplement by writing or telephoning us at the following address:

MeiraGTx Holdings plc

655 Third Avenue, Suite 1115

New York, New York 10017

(646) 860-7985

Exhibits to the filings will not be sent, however, unless those exhibits have specifically been incorporated by reference in this prospectus supplement and accompanying base prospectus.

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#### SUMMARY
 *This summary highlights selected information contained elsewhere in this prospectus supplement and the accompanying base prospectus and in the documents we incorporate by reference herein and therein. This summary does not contain all of the information you should consider before investing in our ordinary shares. You should read this entire prospectus supplement and the accompanying base prospectus carefully, especially the risks of investing in our ordinary shares discussed under "Risk Factors" beginning on page S-6 of this prospectus supplement and page 6 of the accompanying base prospectus and in our [Annual Report on Form 10-K for the year ended December 31, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926036494/mgtx-20251231x10k.htm) incorporated by reference in this prospectus supplement, along with our financial statements and notes to those financial statements and the other information incorporated by reference in this prospectus supplement and the accompanying base prospectus.* 

#### Overview of the Company
We are a vertically integrated, clinical-stage genetic medicines company with a broad pipeline with four late-stage clinical programs. Each of these programs uses local delivery of small doses, resulting in disease-modifying effects in both inherited and more common diseases, in the eye, Parkinson's disease, and radiation-induced xerostomia. We use our innovative technology in optimization of capsids, promoters, and novel translational control elements to develop best-in-class, potent, safe viral vectors. Our broad pipeline is supported by end-to-end in-house manufacturing. We have built the most comprehensive manufacturing capabilities in the industry, including two facilities that are licensed for GMP viral vector production and a GMP QC facility with clinical and commercial licensure. In addition, we have developed a proprietary manufacturing platform process over 9 years based on more than 20 different viral vectors with leading yield and quality aspects and commercial readiness. Uniquely, we have developed a novel technology for *in vivo* delivery of any biologic therapeutic using oral small molecules. This transformative riboswitch gene regulation technology allows precise, dose-responsive control of gene expression by oral small molecules. We are focusing the riboswitch platform on the regulated *in vivo* delivery of metabolic peptides, including GLP-1, GIP, Glucagon, Amylin, PYY, and Leptin, as well as cell therapy, CAR-T for liquid and solid tumors and autoimmune diseases, and additionally, PNS targets addressing long-term intractable pain. We have developed the technology to apply genetic medicine to common diseases, increasing efficacy, addressing novel targets, and expanding access in some of the largest disease areas where the unmet need remains high.

#### Our Corporate Information
MeiraGTx Holdings plc was formed on May 1, 2018 under the laws of the Cayman Islands. Our predecessor, MeiraGTx Limited, a limited company under the laws of England and Wales, was formed on March 20, 2015. In connection with our initial public offering, we reorganized whereby MeiraGTx Limited became a wholly owned subsidiary of MeiraGTx Holdings plc.

Our principal executive offices are located at 655 Third Avenue, Suite 1115, New York, New York 10017 and our telephone number is (646) 860-7985. Our website address is www.meiragtx.com. The information on our website, however, is not, and should not be deemed to be, a part of this prospectus supplement and the accompanying base prospectus.

#### Implications of Being a Smaller Reporting Company
We are a "smaller reporting company" as defined in the Exchange Act. We may take advantage of certain of the scaled disclosures available to smaller reporting companies until the fiscal year following the determination that our voting and non-voting ordinary shares held by non-affiliates is more than $250 million measured on the last business day of our second fiscal quarter, or our annual revenues are more than $100 million during the most recently completed fiscal year and our voting and non-voting ordinary shares held by non-affiliates is more than $700 million measured on the last business day of our second fiscal quarter. To the extent we take advantage of any reduced disclosure obligations, it may make comparison of our financial statements with other public companies difficult or impossible.

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#### THE OFFERING
Ordinary shares offered by us

11,111,111 ordinary shares.

Ordinary shares to be outstanding immediately after this offering

92,557,237 ordinary shares.

Use of Proceeds

We intend to use the net proceeds of this offering for general corporate purposes, including working capital and capital expenditures. See the section entitled "Use of Proceeds" on page S-8 of this prospectus supplement.

Risk Factors

See "Risk Factors" beginning on page S-6 of this prospectus supplement and the other information included in, or incorporated by reference into, this prospectus supplement for a discussion of certain factors you should carefully consider before deciding to invest in our ordinary shares.

Nasdaq Global Select Market symbol

"MGTX"

The number of ordinary shares outstanding reflected in the discussion and table above is based on 81,446,126 ordinary shares outstanding as of March 31, 2026. The number of ordinary shares outstanding as of March 31, 2026 excludes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 6,644,285 ordinary shares issuable upon exercise of share options outstanding under our 2018 Incentive Award Plan, or 2018 Plan, at a weighted-average exercise price of $13.41 per share;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 4,570,000 ordinary shares issuable upon vesting of restricted share units outstanding;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 497,500 ordinary shares underlying outstanding deferred share units granted;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 3,960,159 ordinary shares reserved for future issuance under our 2018 Plan, as well as any automatic increases in the number of our ordinary shares reserved for future issuance under our 2018 Plan;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 3,818,745 ordinary shares reserved for future issuance under our 2018 Employee Share Purchase Plan, or our 2018 ESPP, as well as any automatic increases in the number of our ordinary shares reserved for future issuance under our 2018 ESPP; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • warrants to purchase 700,000 ordinary shares at an exercise price of $8.00 that are outstanding.

Unless otherwise indicated, this prospectus supplement reflects and assumes the following:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • no exercise of the outstanding options and warrants described above; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • no vesting of the outstanding restricted and deferred share units described above.

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#### RISK FACTORS
 *Investment in our ordinary shares offered pursuant to this prospectus supplement and the accompanying base prospectus involves risks. You should carefully consider the risk factors described below and in our [Annual Report on Form 10-K for the year ended December 31, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926036494/mgtx-20251231x10k.htm) incorporated by reference in this prospectus supplement, any amendment or update thereto reflected in subsequent filings with the SEC, including in our Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q, and all other information contained or incorporated by reference in this prospectus supplement, as updated by our subsequent filings under the Exchange Act. The occurrence of any of these risks might cause you to lose all or part of your investment.* 

#### Risks Relating to this Offering
 ***If you purchase our ordinary shares sold in this offering, you will experience immediate and potentially substantial dilution in the net tangible book value of your ordinary shares. In addition, we may issue additional equity or convertible debt securities in the future, which may result in additional dilution to you.***

The offering price of our ordinary shares being offered is substantially higher than the net tangible book value per share of our outstanding ordinary shares prior to this offering. Accordingly, if you purchase our ordinary shares in this offering, you will incur immediate substantial dilution of approximately $8.23 per share, representing the difference between the offering price of $9.00 per ordinary share and our as adjusted net tangible book value as of December 31, 2025. For a more detailed discussion of the foregoing, see the section entitled "Dilution" below. To the extent outstanding options are exercised or restricted share units vest there will be further dilution to new investors. In addition, to the extent we need to raise additional capital in the future and we issue additional ordinary shares or securities convertible or exchangeable for our ordinary shares, our then existing shareholders may experience dilution and the new securities may have rights senior to those of our ordinary shares offered in this offering.

#### We have broad discretion over the use of the net proceeds from this offering and may not use them effectively.
Our management will have broad discretion in the application of the net proceeds from this offering, including for any of the purposes described in the section entitled "Use of Proceeds," and you will not have the opportunity as part of your investment decision to assess whether the net proceeds are being used appropriately. Because of the number and variability of factors that will determine our use of the net proceeds from this offering, their ultimate use may vary substantially from their currently intended use. Our management might not apply our net proceeds in ways that ultimately increase the value of your investment. We expect to use the net proceeds from this offering for general corporate purposes, including working capital and capital expenditures. The failure by our management to apply these funds effectively could harm our business, delay the development of our product candidates and cause the market price of our ordinary shares to decline. Pending their use, we plan to invest the net proceeds from this offering in short- and intermediate-term, interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government. These investments may not yield a favorable return to our shareholders. If we do not invest the net proceeds from this offering in ways that enhance shareholder value, we may fail to achieve expected financial results, which could cause our share price to decline.

 ***A substantial number of ordinary shares may be sold in the market following this offering, which may depress the market price for our ordinary shares.***

Sales of a substantial number of ordinary shares in the public market following this offering could cause the market price of our ordinary shares to decline. A substantial number of the outstanding ordinary shares are, and the ordinary shares sold in this offering upon issuance will be, freely tradable without restriction or further registration under the Securities Act of 1933, as amended, or the Securities Act.

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#### CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS
This prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein and any free writing prospectus that we have authorized for use in connection with this offering may contain forward-looking statements. All statements other than statements of historical facts contained in this prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein and any free writing prospectus, including, but not limited to, statements regarding our expected use of proceeds, if any, from this offering, future results of operations and financial position, our product candidate development, anticipated future milestones, including those regarding pre-clinical and clinical data and reporting of such data, meetings with regulatory authorities regarding pathways for regulatory approval of our product candidates, timing and results of data from our trials and timing of the initiation of trials in respect of our product candidates, are forward-looking statements. These statements 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. This prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein and any free writing prospectus may also contain estimates and other statistical data made by independent parties and by us relating to market size and growth and other data about our industry. This data involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such estimates. In addition, projections, assumptions and estimates of our future performance and the future performance of the markets in which we operate are necessarily subject to a high degree of uncertainty and risk.

In some cases, you can identify forward-looking statements by terms such as "may," "will," "should," "expect," "plan," "anticipate," "could," "intend," "target," "project," "contemplates," "believes," "estimates," "predicts," "potential" or "continue" or the negative of these terms or other similar expressions. The forward-looking statements in this prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein and any free writing prospectus are only predictions. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements speak only as of the respective dates of this prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein and any free writing prospectus, as applicable, and are subject to a number of risks, uncertainties and assumptions, including those described under "Risk Factors" and elsewhere in this prospectus supplement and in our [Annual Report on Form 10-K for the year ended December 31, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926036494/mgtx-20251231x10k.htm) incorporated by reference in this prospectus supplement. The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. Moreover, we operate in an evolving environment. New risk factors and uncertainties may emerge from time to time, and it is not possible for management to predict all risk factors and uncertainties. Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained in this prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein and any free writing prospectus, whether as a result of any new information, future events, changed circumstances or otherwise.

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#### USE OF PROCEEDS
We estimate that the net proceeds from this offering, after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us, will be approximately $93.3 million.

We intend to use the net proceeds of this offering for general corporate purposes, including working capital and capital expenditures.

The amounts and timing of our actual expenditures will depend on numerous factors, including the progress of our clinical trials and other development efforts and other factors described under "Risk Factors" in this prospectus supplement, the accompanying base prospectus and the documents incorporated by reference herein and therein, as well as the amount of cash used in our operations. We may find it necessary or advisable to use the net proceeds for other purposes, and we will have broad discretion in the application of the net proceeds from this offering. Pending the uses described above, we plan to invest the net proceeds from this offering in short- and intermediate term, interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government.

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#### DIVIDEND POLICY
We have never declared or paid any cash dividends on our share capital. We intend to retain future earnings, if any, to finance the development, operation and expansion of our business and do not anticipate declaring or paying any cash dividends in the foreseeable future. Any future determination related to our dividend policy will be made at the discretion of our board of directors after considering our financial condition, results of operations, capital requirements, business prospects and other factors the board of directors deems relevant, and subject to the restrictions contained in any future financing instruments.

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#### DILUTION
If you invest in our ordinary shares, your interest will be diluted to the extent of the difference between the price per share you pay in this offering and the net tangible book value per share of our ordinary shares immediately after this offering. Our net tangible book value of our ordinary shares as of December 31, 2025 was approximately $(21.9) million, or approximately $(0.27) per ordinary share based upon 81,120,931 ordinary shares outstanding. Net tangible book value per share is equal to our total tangible assets, less our total liabilities, divided by the total number of ordinary shares outstanding as of December 31, 2025.

Without taking into account any other changes in our net tangible book value after December 31, 2025, other than to give effect to sale by us of 11,111,111 ordinary shares in this offering at the offering price of $9.00 per ordinary share, and after deducting estimated underwriting discounts and commissions and estimated offering expenses payable by us, our as adjusted net tangible book value as of December 31, 2025 would have been $71.4 million, or $0.77 per ordinary share. This represents an immediate increase in as adjusted net tangible book value of $1.04 per ordinary share to our existing shareholders and an immediate dilution in as adjusted net tangible book value of $8.23 per ordinary share to new investors in this offering.

The following table illustrates this calculation on a per share basis.

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| | | |
|:---|:---|:---|
| Offering price per ordinary share  |  | $9.00 |
| &nbsp;&nbsp;&nbsp; Net tangible book value per ordinary share as of December 31, 2025  | $(0.27) |  |
| &nbsp;&nbsp;&nbsp; Increase in net tangible book value per ordinary share attributable to the offering  | $1.04 |  |
| As adjusted net tangible book value per ordinary share after giving effect to the offering  |  | $0.77 |
| Dilution per ordinary share to new investors participating in the offering  |  | $8.23 |

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The number of ordinary shares outstanding reflected in the discussion and table above is based on 81,120,931 ordinary shares outstanding as of December 31, 2025. The number of ordinary shares outstanding as of December 31, 2025 excludes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 6,744,133 ordinary shares issuable upon exercise of share options outstanding under our 2018 Incentive Award Plan, or 2018 Plan, at a weighted-average exercise price of $13.46 per share;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 6,184,250 ordinary shares issuable upon vesting of restricted share units outstanding;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 497,500 ordinary shares underlying outstanding deferred share units granted;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 617,248 ordinary shares reserved for future issuance under our 2018 Plan, as well as any automatic increases in the number of our ordinary shares reserved for future issuance under our 2018 Plan;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • 3,818,745 ordinary shares reserved for future issuance under our 2018 Employee Share Purchase Plan, or our 2018 ESPP as well as any automatic increases in the number of our ordinary shares reserved for future issuance under our 2018 ESPP; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • warrants to purchase 700,000 ordinary shares at an exercise price of $8.00 that are outstanding.

The foregoing table does not give effect to the exercise of any outstanding options and warrants, or the vesting of any restricted or deferred share units. To the extent options or warrants are exercised or restricted or deferred share units vest, there may be further dilution to new investors.

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#### MATERIAL CAYMAN ISLANDS TAX CONSIDERATIONS
The following discussion is a summary of the material Cayman Islands tax considerations relating to the purchase, ownership and disposition of our ordinary shares. There is, at present, no direct taxation in the Cayman Islands and interest, dividends and gains payable to the Company will be received free of all Cayman Islands taxes. The Company has received an undertaking from the Government of the Cayman Islands to the effect that, for a period of twenty years from the date of the undertaking, no law that thereafter is enacted in the Cayman Islands imposing any tax or duty to be levied on profits, income or on gains or appreciation, or any tax in the nature of estate duty or inheritance tax, will apply to any property comprised in or any income arising under the Company, or to the shareholders thereof, in respect of any such property or income.

No stamp duty in the Cayman Islands is payable in respect of the issue of any ordinary shares or an instrument of transfer in respect of an ordinary share.

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#### MATERIAL UNITED KINGDOM TAX CONSIDERATIONS
The following statements are of a general nature and do not purport to be a complete analysis of all potential UK tax consequences of acquiring, holding and disposing of our ordinary shares. They are based on current UK tax law and on the current published practice of His Majesty's Revenue and Customs ("HMRC") (which may not be binding on HMRC), as of the date of this prospectus supplement, all of which are subject to change, possibly with retrospective effect. They are intended to address only certain United Kingdom ("UK") tax consequences for holders of our ordinary shares who are tax resident in (and only in) the UK, and in the case of individuals, domiciled in (and only in) the UK (except where expressly stated otherwise) who are the absolute beneficial owners of our ordinary shares and any dividends paid on them and who hold our ordinary shares as investments (other than in an individual savings account or a self-invested personal pension). They do not address the UK tax consequences which may be relevant to certain classes of holders of our ordinary shares such as traders, brokers, dealers, banks, financial institutions, insurance companies, investment companies, collective investment schemes, tax-exempt organizations, trustees, persons connected with us or a member of our group, persons holding our ordinary shares as part of hedging or conversion transactions, holders of our ordinary shares who have (or are deemed to have) acquired our ordinary shares in connection with an office or employment, and holders of our ordinary shares who are or have been officers or employees of ours or a company forming part of our group.

The following is intended only as a general guide and is not intended to be, nor should it be considered to be, legal or tax advice to any particular prospective subscriber for, or purchaser of, our ordinary shares. Accordingly, prospective subscribers for, or purchasers of, our ordinary shares who are in any doubt as to their tax position regarding the acquisition, ownership and disposition of our ordinary shares or who are subject to tax in a jurisdiction other than the UK should consult their own tax advisers.

#### The Company
It is the intention of the directors to conduct the affairs of the Company so that the central management and control of the Company is exercised in the UK. As a result, the Company is expected to be treated as resident in the UK for UK tax purposes. Accordingly we expect to be subject to UK taxation on our income and gains, except where an exemption or relief applies.

#### Taxation of dividends

#### Withholding tax
We will not be required to withhold UK tax at source when paying dividends on our ordinary shares.

#### Income tax
An individual holder of our ordinary shares who is resident for tax purposes in the UK may, depending on his or her particular circumstances, be subject to UK tax on dividends received from us. An individual holder of our ordinary shares who is not resident for tax purposes in the UK should not be chargeable to UK income tax on dividends received from us unless he or she carries on (whether solely or in partnership) any trade, profession or vocation in the UK through a branch or agency to which our ordinary shares are attributable. There are certain exceptions for trading in the UK through independent agents, such as some brokers and investment managers.

All dividends received by a UK resident individual holder of our ordinary shares from us or from other sources will form part of that holder's total income for income tax purposes and will constitute the top slice of that income. A nil rate of income tax will apply to the first £500 of taxable dividend income received by the holder of our ordinary shares in a tax year. Income within the nil rate band will be taken into account in determining whether income in excess of the nil rate band falls within the basic rate, higher rate or additional rate tax bands. Where the dividend income is above the £500 dividend allowance, the first £500 of the dividend income will be charged at the nil rate and any excess amount will be taxed at 10.75 per cent. to the extent that the excess amount falls within the basic rate tax band, 35.75 per cent. to the extent that the excess amount falls within the higher rate tax band and 39.35 per cent. to the extent that the excess amount falls within the additional rate tax band.

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#### Corporation tax
Corporate holders of our ordinary shares which are resident for tax purposes in the UK should not be subject to UK corporation tax on any dividend received from us so long as the dividends qualify for exemption and certain conditions are met (including, for example, the conditions in section 931G of the Corporation Tax Act 2009 and applicable anti-avoidance conditions). If the conditions for exemption are not met or cease to be satisfied, or such a holder elects for an otherwise exempt dividend to be taxable, the holder will be subject to UK corporation tax on dividends received from us, at the rate of corporation tax applicable to that holder (the main rate of UK corporation tax is currently 25 per cent.).

Corporate holders of our ordinary shares which are not resident in the UK will not generally be subject to UK corporation tax on dividends unless they are carrying on a trade, profession or vocation in the UK through a permanent establishment in connection with which such shares are attributable.

A holder of our ordinary shares who is resident outside the UK may be subject to non-UK taxation on dividend income under local law.

#### Taxation of capital gains

#### UK resident holders of our ordinary shares
A disposal or deemed disposal of our ordinary shares by an individual or corporate holder of such shares who is tax resident in the UK may, depending on that holder's circumstances and subject to any available exemptions or reliefs, give rise to a chargeable gain or allowable loss for the purposes of UK taxation of chargeable gains.

Any chargeable gain (or allowable loss) will generally be calculated by reference to the consideration received for the disposal of our ordinary shares less the allowable cost to the holder of acquiring such shares.

The applicable tax rates for individual holders of our ordinary shares realizing a gain on the disposal of such shares is, broadly, 18 per cent. for basic rate taxpayers and 24 per cent. for higher and additional rate taxpayers. For corporate holders of our ordinary shares, corporation tax is generally charged on chargeable gains at the rate applicable to the relevant corporate holder.

#### Non-UK holders of our ordinary shares
Holders of our ordinary shares who are not resident in the UK and, in the case of an individual holder of our ordinary shares, not temporarily non-resident, should not be liable for UK tax on capital gains realized on a sale or other disposal of our ordinary shares unless (i) such shares are attributable to a trade, profession or vocation carried on in the UK through a branch or agency or, in the case of a corporate holder of our ordinary shares, through a permanent establishment or (ii) where certain conditions are met, the Company derives 75 per cent. or more of its gross asset value from UK land. Holders of our ordinary shares who are not resident in the UK may be subject to non-UK taxation on any gain under local law.

Generally, an individual holder of our ordinary shares who has ceased to be resident in the UK for tax purposes for a period of five years or less and who disposes of our ordinary shares during that period may be liable on their return to the UK to UK taxation on any capital gain realized (subject to any available exemption or relief).

#### UK stamp duty ("Stamp Duty") and UK stamp duty reserve tax ("SDRT")
The statements below are intended as a general guide to the current position relating to Stamp Duty and SDRT and apply to any holders of our ordinary shares irrespective of their place of tax residence.

No Stamp Duty or SDRT, will be payable on the issue of ordinary shares.

Stamp Duty will in principle be payable on any instrument of transfer of ordinary shares that is executed in the UK or that relates to any property situated, or to any matter or thing done or to be done, in the UK. If arising, Stamp Duty is payable at the rate of 0.5% of the amount or value of the consideration

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given for the transfer (rounded up to the next £5.00). An exemption from Stamp Duty is available on an instrument transferring ordinary shares where the amount or value of the consideration is £1,000 or less and it is certified on the instrument that the transaction effected by the instrument does not form part of a larger transaction or series of transactions in respect of which the aggregate amount or value of the consideration exceeds £1,000. Certain categories of person, including intermediaries, brokers and dealers, may not be liable to Stamp Duty. Holders of ordinary shares should be aware that, even where an instrument of transfer is in principle subject to Stamp Duty, Stamp Duty is not required to be paid unless it is necessary to rely on the instrument for legal purposes, for example to register a change of ownership or in litigation in a UK court.

Provided that the ordinary shares are not registered in any register maintained in the UK by or on behalf of the Company and are not paired with any shares issued by a UK incorporated company, any agreement to transfer the ordinary shares will not be subject to SDRT. The ordinary shares are not paired with any shares issued by a UK incorporated company and we currently do not intend that any register of the ordinary shares will be maintained in the United Kingdom.

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#### MATERIAL U.S. FEDERAL INCOME TAX CONSEQUENCES TO U.S. HOLDERS
The following discussion is a summary of the material U.S. federal income tax consequences to U.S. Holders (as defined below) of the purchase, ownership, and disposition of our ordinary shares issued pursuant to this offering. It is not a comprehensive description of all tax considerations that may be relevant to a particular person's decision to acquire our ordinary shares. The effects of any applicable state, local, or non-U.S. laws, and other U.S. federal tax laws such as estate and gift tax laws, are not discussed. This discussion is based on the U.S. Internal Revenue Code of 1986, as amended (the "Code"), U.S. Treasury regulations promulgated thereunder, judicial decisions, and published rulings and administrative pronouncements of the U.S. Internal Revenue Service (the "IRS"), all as in effect as of the date of this prospectus supplement. All of the foregoing authorities are subject to change and to differing interpretations, and any such change or different interpretation could apply retroactively and could alter the tax consequences of the purchase, ownership, and disposition of our ordinary shares described below. We have not sought and will not seek any rulings from the IRS regarding the matters discussed below. There can be no assurance the IRS or a court will not take a contrary position to that discussed below regarding the tax consequences of the purchase, ownership, and disposition of our ordinary shares.

This discussion is limited to U.S. Holders that hold our ordinary shares as capital assets (generally, property held for investment). This discussion does not address all U.S. federal income tax consequences relevant to a U.S. Holder's particular circumstances, including the impact of the Medicare contribution tax on net investment income, the special tax accounting rules under Section 451(b) of the Code, and any alternative minimum tax. In addition, this discussion does not address all U.S. federal income tax consequences relevant to U.S. Holders subject to particular rules, including, without limitation:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • U.S. expatriates and certain former citizens or long-term residents of the United States;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons whose functional currency is not the U.S. dollar;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons holding our ordinary shares as part of a hedge, straddle or other risk reduction strategy or as part of a conversion transaction or other integrated investment;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • banks, insurance companies, and other financial institutions;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • real estate investment trusts or regulated investment companies;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • brokers, dealers, or traders in securities, commodities, or currencies;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • S corporations or partnerships or other entities or arrangements treated as partnerships for U.S. federal income tax purposes (and investors therein);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • pension plans;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • tax-exempt organizations or governmental organizations;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • individual retirement accounts or other tax deferred accounts;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons who acquired our ordinary shares pursuant to the exercise of any employee share option or otherwise as compensation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons that own or are deemed to own 10% or more of our ordinary shares by vote or value;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons subject to special tax accounting rules as a result of any item of gross income with respect to our ordinary shares being taken into account in an applicable financial statement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons that hold our ordinary shares through or in connection with a permanent establishment, trade or business, or fixed base outside the United States; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • persons deemed to sell our ordinary shares under the constructive sale provisions of the Code.

If an entity or arrangement treated as a partnership for U.S. federal income tax purposes holds our ordinary shares, the U.S. federal income tax treatment of a partner in such partnership will depend on the status of the partner, the activities of the partnership, and certain determinations made at the partner level. Partnerships holding our ordinary shares and the partners in such partnerships should consult their tax advisors regarding the U.S. federal income tax consequences applicable to them.

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 **THIS DISCUSSION IS FOR INFORMATIONAL PURPOSES ONLY AND IS NOT TAX ADVICE. U.S. HOLDERS ARE URGED TO CONSULT THEIR TAX ADVISORS REGARDING THE APPLICATION OF THE U.S. FEDERAL TAX RULES TO THEIR PARTICULAR CIRCUMSTANCES AS WELL AS THE TAX CONSEQUENCES TO THEM OF THE PURCHASE, OWNERSHIP, AND DISPOSITION OF OUR ORDINARY SHARES ARISING UNDER THE U.S. FEDERAL ESTATE OR GIFT TAX LAWS OR UNDER THE LAWS OF ANY STATE, LOCAL, OR NON-U.S. TAXING JURISDICTION OR UNDER ANY APPLICABLE INCOME TAX TREATY.** 

For purposes of this discussion, a "U.S. Holder" is a beneficial owner of our ordinary shares that, for U.S. federal income tax purposes, is or is treated as any of the following:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • an individual who is a citizen or resident of the United States;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a corporation created or organized in or under the laws of the United States, any state therein, or the District of Columbia;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • an estate, the income of which is subject to U.S. federal income tax regardless of its source; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a trust that (1) is subject to the primary supervision of a U.S. court and one or more "United States persons" (within the meaning of Section 7701(a)(30) of the Code) have the authority to control all substantial decisions of the trust, or (2) has a valid election in effect to be treated as a United States person for U.S. federal income tax purposes.

#### Taxation of Dividends and Other Distributions on Our Ordinary Shares
The discussion in this section is subject to the discussion below under "Passive Foreign Investment Company Rules".

As discussed above under "Dividend Policy," we do not anticipate paying any cash dividends in the foreseeable future. In the event we do make distributions of cash or property, the gross amount of any such distribution to U.S. Holders with respect to our ordinary shares will be included in such holders' gross income as dividend income when actually or constructively received to the extent the distribution is paid out of our current or accumulated earnings and profits (as determined under U.S. federal income tax principles). To the extent the amount of the distribution exceeds our current and accumulated earnings and profits, it will be treated first as a return of tax basis in the ordinary shares, and to the extent the amount of the distribution exceeds such tax basis, the excess amount will be taxed as capital gain. We do not intend to calculate our earnings and profits under U.S. federal income tax principles. Therefore, a U.S. Holder should expect that distributions will generally be reported as dividend income for such purposes. Dividends we pay will not be eligible for the dividends-received deduction available to corporations in respect of dividends received from U.S. corporations.

Subject to certain limitations, dividends paid by qualified foreign corporations to certain non-corporate U.S. Holders may be taxable at preferential tax rates. A non-U.S. corporation is generally treated as a qualified foreign corporation with respect to dividends paid on stock that is readily tradable on a securities market in the United States, such as the Nasdaq Global Select Market, on which our ordinary shares are listed. There can be no assurance that our ordinary shares are, or will continue to be, readily tradable on an established securities exchange. Consequently, there can be no assurance that dividends paid on our ordinary shares will be afforded the reduced tax rates. In addition, the reduced tax rates will not apply if we are treated as a PFIC (as defined below) with respect to the U.S. Holder for the taxable year in which a dividend is paid or the preceding taxable year. Non-corporate U.S. Holders should consult their tax advisers regarding the availability of the reduced tax rate on dividends. Dividends will be included in a U.S. Holder's income on the date of the U.S. Holder's receipt of the dividend.

Our dividends will generally constitute foreign source income for foreign tax credit limitation purposes. Any tax withheld with respect to distributions on the ordinary shares may, subject to a number of complex limitations, be claimed as a foreign tax credit against such U.S. Holder's U.S. federal income tax liability or, at such U.S. Holder's election, may be claimed as a deduction for U.S. federal income tax purposes. The rules with respect to the foreign tax credit are complex, and U.S. Treasury regulations have introduced additional requirements and limitations to the foreign tax credit rules. U.S. Holders should consult their tax advisors

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regarding the availability of the foreign tax credit and the impact of any applicable income tax treaties in light of their particular circumstances.

#### Sale or Other Taxable Disposition of Our Ordinary Shares
The discussion in this section is subject to the discussion below under "Passive Foreign Investment Company Rules".

A U.S. Holder will recognize gain or loss on any sale, exchange, or other taxable disposition of our ordinary shares equal to the difference between the amount realized (in U.S. dollars) on the disposition and such holder's tax basis (in U.S. dollars) in the ordinary shares. Any such gain or loss will be capital gain or loss and will be long-term capital gain or loss if such U.S. Holder held the ordinary shares for more than one year at the time of the disposition. Long-term capital gains recognized by certain non-corporate U.S. Holders, including individuals, generally will be taxable at reduced rates. The deductibility of capital losses is subject to limitations. Any such gain or loss a U.S. Holder recognizes generally will be treated as U.S. source for foreign tax credit limitation purposes. The rules with respect to the foreign tax credit are complex, and U.S. Treasury regulations have introduced additional requirements and limitations to the foreign tax credit rules.

U.S. Holders should consult their tax advisors regarding the proper treatment of gain or loss, including the availability of the foreign tax credit and the impact of any applicable income tax treaties, in light of their particular circumstances.

#### Passive Foreign Investment Company Rules
Based on the current and anticipated value of our assets and the composition of our income, assets and operations, we do not expect to be classified as a passive foreign investment company ("PFIC") for the current taxable year. However, the application of the PFIC rules is subject to uncertainty in several respects, and there can be no assurance that we have not been treated as a PFIC in prior taxable years or will not be treated as a PFIC in the future. A non-U.S. corporation will be classified as a PFIC for any taxable year in which, after applying certain look-through rules, either:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • at least 75% of its gross income for such taxable year is passive income, or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • at least 50% of the value of its assets (based on an average of the quarterly values of the assets during a taxable year) is attributable to assets that produce or are held for the production of passive income.

For purposes of the above calculations, if a non-U.S. corporation owns, directly or indirectly, 25% or more of the total value of the outstanding shares of another corporation, it will be treated as if it (a) held a proportionate share of the assets of such other corporation and (b) received directly a proportionate share of the income of such other corporation. Passive income generally includes dividends, interest, rents, royalties and capital gains, but generally excludes rents and royalties which are derived in the active conduct of a trade or business and which are received from a person other than a related person.

A separate determination must be made with respect to each taxable year as to whether we are a PFIC (after the close of each such taxable year). As a result, our PFIC status may change. Because the value of our assets for purposes of the asset test (including goodwill) will generally be determined by reference to the market price of our ordinary shares, our PFIC status will depend in large part on the market price of our ordinary shares, which may fluctuate significantly. In addition, our PFIC status may be affected by changes in the composition of our income or assets, including the manner in which, and how quickly, we utilize the cash proceeds of any offering, including this offering. Finally, until such time as we start generating material revenue from operations, our PFIC status may depend, in part or in full, on the treatment of payments we receive from other sources (including tax credits), which is uncertain, and the magnitude of such payments compared to passive income from investments.

If we are classified as a PFIC in any taxable year with respect to which a U.S. Holder owns our ordinary shares, we will continue to be treated as a PFIC with respect to such U.S. Holder in all succeeding years during which the U.S. Holder owns our ordinary shares, regardless of whether we continue

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to meet the tests described above unless (1) we cease to be a PFIC and the U.S. Holder has made a "deemed sale" election under the PFIC rules, or (2) the U.S. Holder makes a QEF Election (as defined below) with respect to all taxable years in which we are a PFIC during the U.S. Holder's holding period or makes a purging election to cause a deemed sale of our ordinary shares at their fair market value in conjunction with a QEF Election. If a deemed sale election is made, the U.S. Holder will be deemed to have sold our ordinary shares it holds at their fair market value and any gain from such deemed sale would be subject to the rules described below. After the deemed sale election, so long as we do not become a PFIC in a subsequent taxable year, the ordinary shares with respect to which such election was made will not be treated as shares in a PFIC and the U.S. Holder will not be subject to the rules described below with respect to any "excess distribution" it receives from us or any gain from an actual sale or other disposition of our ordinary shares. If we are treated as a PFIC with respect to a U.S. Holder, and subsequently cease to be a PFIC, such U.S. Holder should consult its tax advisors as to the possibility and consequences of making a deemed sale election.

If we are treated as a PFIC for any taxable year during which a U.S. Holder holds our ordinary shares, such holder will be subject to special tax rules with respect to any "excess distribution" received and any gain recognized from a sale or other disposition (including a pledge) of our ordinary shares, unless such holder makes a QEF Election or a mark-to-market election as discussed below. Distributions a U.S. Holder receives in a taxable year that are greater than 125% of the average annual distributions such holder received during the shorter of the three preceding taxable years or such holder's holding period for the ordinary shares will be treated as an excess distribution. Under these special tax rules, if a U.S. Holder receives any excess distribution or realizes any gain from a sale or other disposition of the ordinary shares:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the excess distribution or gain will be allocated ratably over such holder's holding period for our ordinary shares,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the amount allocated to the current taxable year, and any taxable year before the first taxable year in which we were a PFIC, will be treated as ordinary income, and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the amount allocated to each other year will be subject to the highest tax rate in effect for that year and the interest charge generally applicable to underpayments of tax will be imposed on the resulting tax attributable to each such year.

The tax liability for amounts allocated to years before the year of disposition or "excess distribution" cannot be offset by any net operating losses for such years, and gains (but not losses) realized on the sale or other taxable disposition of our ordinary shares cannot be treated as capital gains.

If we are a PFIC, a U.S. Holder generally will be subject to similar rules with respect to distributions we receive from, and our dispositions of the stock of, any of our direct or indirect subsidiaries or any other entities in which we hold equity interests that also are PFICs ("lower-tier PFICs") as if such U.S. Holder held its proportionate share of the stock of such lower-tier PFICs directly. U.S. Holders should consult their tax advisors regarding the application of the PFIC rules to lower-tier PFICs.

Certain elections may be available that would result in alternative treatments if we are treated as a PFIC for any taxable year during which a U.S. Holder holds our ordinary shares. U.S. Holders can avoid the interest charge on excess distributions or gain relating to our ordinary shares by making a mark-to-market election with respect to the ordinary shares, provided that the ordinary shares are "marketable stock." Our ordinary shares will be marketable stock if they are "regularly traded" on certain U.S. stock exchanges or on a non-U.S. stock exchange that meets certain conditions. For these purposes, the ordinary shares will be considered regularly traded during any calendar year during which they are traded, other than in de minimis quantities, on at least 15 days during each calendar quarter. Any trades that have as one of their principal purposes meeting this requirement will be disregarded. Our ordinary shares are listed on the Nasdaq Global Select Market, which is a qualified exchange for these purposes. Consequently, if our ordinary shares remain listed on the Nasdaq Global Select Market and are "regularly traded", the mark-to-market election may be available to U.S. Holders. However, a mark-to-market election generally cannot be made for equity interests in any lower-tier PFICs that we own, unless shares of such lower-tier PFIC are themselves marketable stock. As a result, even if a U.S. Holder validly makes a mark-to-market election with respect to our ordinary shares, the U.S. Holder may continue to be subject to the rules described above with respect to any "excess distribution" in respect of its indirect interest in any of our investments that are treated as an

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equity interest in a PFIC for U.S. federal income tax purposes. Each U.S. Holder should consult its tax advisor as to the whether a mark-to-market election is available or advisable with respect to our ordinary shares, as well as the impact of such election on interests in any lower-tier PFICs.

The adverse consequences of owning stock in a PFIC could also be mitigated if a U.S. Holder makes a valid "qualified electing fund" election ("QEF Election"), which, among other things, would require a U.S. Holder to include currently in income its pro rata share of the PFIC's net capital gain and ordinary earnings, based on earnings and profits as determined for U.S. federal income tax purposes. We cannot provide any assurance that we would provide the information necessary for U.S. Holders of our ordinary shares to make QEF Elections in the event we are or were classified as a PFIC.

If we are considered a PFIC, U.S. Holders will also be subject to annual information reporting requirements. A U.S. Holder's failure to file the annual report may result in substantial penalties and extend the statute of limitations with respect to the U.S. Holder's federal income tax return. If we are or become a PFIC, U.S. Holders should consult their tax advisors regarding any reporting requirements that may apply to them.

U.S. Holders are urged to consult their tax advisors regarding the application of the PFIC rules to the ownership and disposition of our ordinary shares and the potential availability of a mark-to-market or QEF election.

#### Information Reporting and Backup Withholding
Dividend payments with respect to our ordinary shares and proceeds from the sale, exchange, or other taxable disposition of our ordinary shares may be subject to information reporting to the IRS and U.S. backup withholding. Certain U.S. Holders are exempt from backup withholding, including corporations and certain tax-exempt organizations. A U.S. Holder will be subject to backup withholding if such holder is not a corporation or otherwise exempt and such holder:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • fails to furnish the holder's taxpayer identification number, which for an individual is ordinarily such individual's social security number;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • furnishes an incorrect taxpayer identification number;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • is notified by the IRS that the holder previously failed to properly report payments of interest or dividends; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • fails to certify under penalties of perjury that the holder has furnished a correct taxpayer identification number and that the IRS has not notified the holder that the holder is subject to backup withholding.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against the U.S. Holder's U.S. federal income tax liability, provided the required information is timely furnished to the IRS. U.S. Holders should consult their tax advisors regarding their qualification for an exemption from backup withholding and the procedures for obtaining such an exemption.

#### Additional Reporting Requirements
Certain U.S. Holders who are individuals (and certain entities) that hold an interest in "specified foreign financial assets" (which may include our ordinary shares) are required to report information relating to such assets, subject to certain exceptions (including an exception for our ordinary shares held in accounts maintained by certain U.S. financial institutions). Penalties can apply if U.S. Holders fail to satisfy such reporting requirements. U.S. Holders should consult their tax advisors regarding the applicability of these requirements to their acquisition, ownership, and disposition of our ordinary shares.

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#### UNDERWRITING
BofA Securities, Inc. and Goldman Sachs & Co. LLC are acting as representatives of each of the underwriters named below. Subject to the terms and conditions set forth in an underwriting agreement among us and the underwriters, we have agreed to sell to the underwriters, and each of the underwriters has agreed, severally and not jointly, to purchase from us, the number of ordinary shares set forth opposite its name below.

---

| | |
|:---|:---|
| **Underwriter**  | **Number of <br> Ordinary Shares**  |
| BofA Securities, Inc.  | 5000000 |
| Goldman Sachs & Co. LLC  | 5000000 |
| Raymond James & Associates, Inc.  | 1111111 |
| &nbsp;&nbsp;&nbsp; Total  | 11111111 |

---

Subject to the terms and conditions set forth in the underwriting agreement, the underwriters have agreed, severally and not jointly, to purchase all of the ordinary shares sold under the underwriting agreement if any of these shares are purchased. If an underwriter defaults, the underwriting agreement provides that the purchase commitments of the non-defaulting underwriters may be increased or the underwriting agreement may be terminated.

We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make in respect of those liabilities.

The underwriters are offering the ordinary shares, subject to prior sale, when, as and if issued to and accepted by them, subject to approval of legal matters by their counsel, including the validity of the ordinary shares, and other conditions contained in the underwriting agreement, such as the receipt by the underwriters of officer's certificates and legal opinions. The underwriters reserve the right to withdraw, cancel or modify offers and to reject orders in whole or in part.

#### Commissions and Discounts
The representatives have advised us that the underwriters propose initially to offer the ordinary shares at the offering price set forth on the cover page of this prospectus supplement and to dealers at that price less a concession not in excess of $0.324 per ordinary share. After the initial offering, the offering price, concession or any other term of the offering may be changed.

The following table shows the offering price, underwriting discounts and commissions and proceeds before expenses to us.

---

| | |
|:---|:---|
| | **Per <br> Ordinary Share**  |
| Offering price  | $9.00 |
| Underwriting discounts and commissions  | $0.54 |
| Proceeds, before expenses, to us  | $8.46 |

---

The expenses of the offering, not including the underwriting discounts and commissions, are estimated at $700,000 and are payable by us. We have also agreed to reimburse the underwriters for certain of their expenses in an amount up to $50,000.

#### No Sales of Similar Securities
We, our executive officers and directors have agreed not to sell or transfer any ordinary shares or securities convertible into, exchangeable for, exercisable for, or repayable with ordinary shares, for 45 days after the date of this prospectus supplement without first obtaining the written consent of BofA Securities, Inc. and Goldman Sachs & Co. LLC. However, we may not issue ordinary shares pursuant to our Sales

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Agreement, dated December 21, 2023, by and between us and BofA Securities, Inc. for 30 days after the date of this prospectus supplement. Specifically, we and these other persons have agreed, with certain limited exceptions, not to directly or indirectly:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • offer, pledge, sell or contract to sell any ordinary shares,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • sell any option or contract to purchase any ordinary shares,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • purchase any option or contract to sell any ordinary shares,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • grant any option, right or warrant for the sale of any ordinary shares,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • lend or otherwise dispose of or transfer any ordinary shares,

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • request or demand that we file a registration statement related to the ordinary shares, or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • enter into any swap or other agreement that transfers, in whole or in part, the economic consequence of ownership of any ordinary shares whether any such swap or transaction is to be settled by delivery of shares or other securities, in cash or otherwise.

This lock-up provision applies to ordinary shares and to securities convertible into or exchangeable or exercisable for or repayable with ordinary shares. It also applies to ordinary shares owned now or acquired later by the person executing the agreement or for which the person executing the agreement later acquires the power of disposition.

#### Nasdaq Global Select Market Listing
The ordinary shares are listed on the Nasdaq Global Select Market under the symbol "MGTX."

#### Price Stabilization and Short Positions
Until the distribution of the ordinary shares is completed, SEC rules may limit the underwriters and selling group members from bidding for and purchasing our ordinary shares. However, the representatives may engage in transactions that stabilize the price of the ordinary shares, such as bids or purchases to peg, fix or maintain that price.

Similar to other purchase transactions, the underwriters' purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our ordinary shares or preventing or retarding a decline in the market price of our ordinary shares. As a result, the price of our ordinary shares may be higher than the price that might otherwise exist in the open market. The underwriters may conduct these transactions on the Nasdaq Global Select Market, in the over-the-counter market or otherwise.

Neither we nor any of the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our ordinary shares. In addition, neither we nor any of the underwriters make any representation that the representatives will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

#### Passive Market Making
In connection with this offering, underwriters and selling group members may engage in passive market making transactions in the ordinary shares on the Nasdaq Global Select Market in accordance with

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Rule 103 of Regulation M under the Exchange Act during a period before the commencement of offers or sales of ordinary shares and extending through the completion of distribution. A passive market maker must display its bid at a price not in excess of the highest independent bid of that security. However, if all independent bids are lowered below the passive market maker's bid, that bid must then be lowered when specified purchase limits are exceeded. Passive market making may cause the price of our ordinary shares to be higher than the price that otherwise would exist in the open market in the absence of those transactions. The underwriters and dealers are not required to engage in passive market making and may end passive market making activities at any time.

#### Electronic Distribution
In connection with the offering, certain of the underwriters or securities dealers may distribute the prospectus supplement and accompanying prospectus by electronic means, such as e-mail.

#### Other Relationships
Some of the underwriters and their affiliates have engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us or our affiliates. They have received, or may in the future receive, customary fees and commissions for these transactions. For example, BofA Securities, Inc. is the sales agent under our Sales Agreement, dated December 21, 2023, pursuant to which we are able to offer and sell ordinary shares having an aggregate offering price of up to $100,000,000 through BofA Securities, Inc. as sales agent.

In addition, in the ordinary course of their business activities, the underwriters and their affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers.

Such investments and securities activities may involve securities and/or instruments of ours or our affiliates. The underwriters and their affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or financial instruments and may hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

#### Notice to Prospective Investors in the European Economic Area
In relation to each Member State of the European Economic Area (each a "Relevant State"), no ordinary shares have been offered or will be offered pursuant to the offering to the public in that Relevant State prior to the publication of a prospectus in relation to the ordinary shares which has been approved by the competent authority in that Relevant State or, where appropriate, approved in another Relevant State and notified to the competent authority in that Relevant State, all in accordance with the Prospectus Regulation, except that offers of ordinary shares may be made to the public in that Relevant State at any time under the following exemptions under the Prospectus Regulation:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (a)

to any legal entity which is a qualified investor as defined under Article 2 of the Prospectus Regulation;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (b)

to fewer than 150 natural or legal persons (other than qualified investors as defined under Article 2 of the Prospectus Regulation), subject to obtaining the prior consent of representatives for any such offer; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (c)

in any other circumstances falling within Article 1(4) of the Prospectus Regulation,

*provided* that no such offer of ordinary shares shall require the Company or any representative to publish a prospectus pursuant to Article 3 of the Prospectus Regulation, supplement a prospectus pursuant to Article 23 of the Prospectus Regulation or publish an Annex IX document pursuant to Article 1(4) of the Prospectus Regulation. Each person in a Relevant State who initially acquires any ordinary shares or to whom any offer is made will be deemed to have represented, acknowledged and agreed to and with us and the representatives that it is a qualified investor within the meaning of the Prospectus Regulation.

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In the case of any ordinary shares being offered to a financial intermediary as that term is used in Article 5(1) of the Prospectus Regulation, each such financial intermediary will be deemed to have represented, acknowledged and agreed that the ordinary shares acquired by it in the offer have not been acquired on a non-discretionary basis on behalf of, nor have they been acquired with a view to their offer or resale to, persons in circumstances which may give rise to an offer to the public other than their offer or resale in a Relevant State to qualified investors, in circumstances in which the prior consent of the representatives has been obtained to each such proposed offer or resale.

We, the representatives and their affiliates will rely upon the truth and accuracy of the foregoing representations, acknowledgements and agreements.

For the purposes of this provision, the expression an "offer to the public" in relation to any ordinary shares in any Relevant State means the communication in any form and by any means of sufficient information on the terms of the offer and any ordinary shares to be offered so as to enable an investor to decide to purchase or subscribe for any ordinary shares, and the expression "Prospectus Regulation" means Regulation (EU) 2017/1129.

The above selling restriction is in addition to any other selling restrictions set out below.

In connection with the offering, the underwriters are not acting for anyone other than the issuer and will not be responsible to anyone other than the issuer for providing the protections afforded to their clients nor for providing advice in relation to the offering.

#### Notice to Prospective Investors in the United Kingdom
No shares have been offered or will be offered pursuant to this offering to the public in the United Kingdom (the "UK") except that the shares may be offered to the public in the UK at any time:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (a)

where the offer is conditional on the admission of the shares to trading on the London Stock Exchange plc's main market (in reliance on the exception in paragraph 6(a) of Schedule 1 of the POATR);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (b)

to any qualified investor as defined under paragraph 15 of Schedule 1 of the POATR;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (c)

to fewer than 150 persons (other than qualified investors as defined under paragraph 15 of Schedule 1 of the POATR), subject to obtaining the prior consent of the representatives for any such offer; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (d)

in any other circumstances falling within Part 1 of Schedule 1 of the POATR.

Each person in the UK who initially acquires any ordinary shares or to whom any offer is made will be deemed to have represented, acknowledged and agreed to and with us and the Managers that it is a qualified investor within the meaning of the UK Prospectus Regulation.

In the case of any ordinary shares being offered to a financial intermediary as that term is used in Article 5(1) of the UK Prospectus Regulation, each such financial intermediary will be deemed to have represented, acknowledged and agreed that the ordinary shares acquired by it in the offer have not been acquired on a non-discretionary basis on behalf of, nor have they been acquired with a view to their offer or resale to, persons in circumstances which may give rise to an offer to the public other than their offer or resale in the UK to qualified investors, in circumstances in which the prior consent of the representatives has been obtained to each such proposed offer or resale.

We, the representatives and their affiliates will rely upon the truth and accuracy of the foregoing representations, acknowledgements and agreements.

For the purposes of this provision, the expression an "offer to the public" in relation to any ordinary shares in the UK means the communication to any person which presents sufficient information on: (a) the shares to be offered; and (b) the terms on which they are to be offered, to enable an investor to decide to buy or subscribe for the ordinary shares, and the expressions "POATR" means the Public Offers and Admissions to Trading Regulations 2024.

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In connection with the offering, the representatives are not acting for anyone other than the issuer and will not be responsible to anyone other than the issuer for providing the protections afforded to their clients nor for providing advice in relation to the offering.

This document is for distribution only to persons who (i) have professional experience in matters relating to investments and who qualify as investment professionals within the meaning of Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the "Financial Promotion Order"), (ii) are persons falling within Article 49(2)(a) to (d) ("high net worth companies, unincorporated associations etc.") of the Financial Promotion Order, (iii) are outside the United Kingdom, or (iv) are persons to whom an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000, as amended ("FSMA")) in connection with the issue or sale of any securities may otherwise lawfully be communicated or caused to be communicated (all such persons together being referred to as "relevant persons"). This document is directed only at relevant persons and must not be acted on or relied on by persons who are not relevant persons. Any investment or investment activity to which this document relates is available only to relevant persons and will be engaged in only with relevant persons.

#### Notice to Prospective Investors in Switzerland
The ordinary shares may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange ("SIX") or on any other stock exchange or regulated trading facility in Switzerland. This document has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this document nor any other offering or marketing material relating to the ordinary shares or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this document nor any other offering or marketing material relating to the offering, the Company, the ordinary shares have been or will be filed with or approved by any Swiss regulatory authority. In particular, this document will not be filed with, and the offer of ordinary shares will not be supervised by, the Swiss Financial Market Supervisory Authority, and the offer of ordinary shares has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes ("CISA"). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of ordinary shares.

#### Notice to Prospective Investors in the Dubai International Financial Centre
This prospectus supplement relates to an Exempt Offer in accordance with the Offered Securities Rules of the Dubai Financial Services Authority ("DFSA"). This prospectus supplement is intended for distribution only to persons of a type specified in the Offered Securities Rules of the DFSA. It must not be delivered to, or relied on by, any other person. The DFSA has no responsibility for reviewing or verifying any documents in connection with Exempt Offers. The DFSA has not approved this prospectus supplement nor taken steps to verify the information set forth herein and has no responsibility for the prospectus supplement. The ordinary shares to which this prospectus supplement relates may be illiquid and/or subject to restrictions on their resale. Prospective purchasers of the ordinary shares offered should conduct their own due diligence on the ordinary shares. If you do not understand the contents of this prospectus supplement you should consult an authorized financial advisor.

#### Notice to Prospective Investors in Australia
No placement document, prospectus, product disclosure statement or other disclosure document has been lodged with the Australian Securities and Investments Commission ("ASIC"), in relation to the offering. This prospectus supplement does not constitute a prospectus, product disclosure statement or other disclosure document under the Corporations Act 2001 (the "Corporations Act"), and does not purport to include the information required for a prospectus, product disclosure statement or other disclosure document under the Corporations Act.

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Any offer in Australia of the ordinary shares may only be made to persons (the "Exempt Investors") who are "sophisticated investors" (within the meaning of section 708(8) of the Corporations Act), "professional investors" (within the meaning of section 708(11) of the Corporations Act) or otherwise pursuant to one or more exemptions contained in section 708 of the Corporations Act so that it is lawful to offer the ordinary shares without disclosure to investors under Chapter 6D of the Corporations Act.

The ordinary shares applied for by Exempt Investors in Australia must not be offered for sale in Australia in the period of 12 months after the date of allotment under the offering, except in circumstances where disclosure to investors under Chapter 6D of the Corporations Act would not be required pursuant to an exemption under section 708 of the Corporations Act or otherwise or where the offer is pursuant to a disclosure document which complies with Chapter 6D of the Corporations Act. Any person acquiring ordinary shares must observe such Australian on-sale restrictions.

This prospectus supplement contains general information only and does not take account of the investment objectives, financial situation or particular needs of any particular person. It does not contain any securities recommendations or financial product advice. Before making an investment decision, investors need to consider whether the information in this prospectus supplement is appropriate to their needs, objectives and circumstances, and, if necessary, seek expert advice on those matters.

#### Notice to Prospective Investors in Hong Kong
The ordinary shares have not been offered or sold and will not be offered or sold in Hong Kong, by means of any document, other than (a) to "professional investors" as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong and any rules made under that Ordinance; or (b) in other circumstances which do not result in the document being a "prospectus" as defined in the Companies Ordinance (Cap. 32) of Hong Kong or which do not constitute an offer to the public within the meaning of that Ordinance. No advertisement, invitation or document relating to the ordinary shares has been or may be issued or has been or may be in the possession of any person for the purposes of issue, whether in Hong Kong or elsewhere, which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted to do so under the securities laws of Hong Kong) other than with respect to ordinary shares which are or are intended to be disposed of only to persons outside Hong Kong or only to "professional investors" as defined in the Securities and Futures Ordinance and any rules made under that Ordinance.

#### Notice to Prospective Investors in Japan
The ordinary shares have not been and will not be registered under the Financial Instruments and Exchange Law of Japan (Law No. 25 of 1948, as amended) and, accordingly, will not be offered or sold, directly or indirectly, in Japan, or for the benefit of any Japanese Person or to others for re-offering or resale, directly or indirectly, in Japan or to any Japanese Person, except in compliance with all applicable laws, regulations and ministerial guidelines promulgated by relevant Japanese governmental or regulatory authorities in effect at the relevant time. For the purposes of this paragraph, "Japanese Person" shall mean any person resident in Japan, including any corporation or other entity organized under the laws of Japan.

#### Notice to Prospective Investors in Singapore
This prospectus supplement has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, the ordinary shares were not offered or sold or caused to be made the subject of an invitation for subscription or purchase and will not be offered or sold or caused to be made the subject of an invitation for subscription or purchase, and this prospectus or any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the ordinary shares, has not been circulated or distributed, nor will it be circulated or distributed, whether directly or indirectly, to any person in Singapore other than (i) to an institutional investor (as defined in Section 4A of the Securities and Futures Act (Chapter 289) of Singapore, as modified or amended from time to time (the "SFA")) pursuant to Section 274 of the SFA, (ii) to a relevant person (as defined in Section 275(2) of the SFA) pursuant to Section 275(1) of the SFA, or any person pursuant to Section 275(1A) of the SFA, and in accordance with the conditions specified in Section 275 of the SFA, or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

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Where the ordinary shares are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (a)

a corporation (which is not an accredited investor (as defined in Section 4A of the SFA)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (b)

a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary of the trust is an individual who is an accredited investor, securities or securities-based derivatives contracts (each term as defined in Section 2(1) of the SFA) of that corporation or the beneficiaries' rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the ordinary shares pursuant to an offer made under Section 275 of the SFA except:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (c)

to an institutional investor or to a relevant person, or to any person arising from an offer referred to in Section 275(1A) or Section 276(4)(i)(B) of the SFA;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (d)

where no consideration is or will be given for the transfer;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (e)

where the transfer is by operation of law; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (f)

as specified in Section 276(7) of the SFA.

#### Notice to Prospective Investors in Canada
The ordinary shares may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 *Prospectus Exemptions* or subsection 73.3(1) of the *Securities Act* (Ontario), and are permitted clients, as defined in National Instrument 31-103 *Registration Requirements, Exemptions and Ongoing Registrant Obligations*. Any resale of the ordinary shares must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement or the accompanying prospectus (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser's province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser's province or territory for particulars of these rights or consult with a legal advisor.

Pursuant to section 3A.3 (or, in the case of securities issued or guaranteed by the government of a non-Canadian jurisdiction, section 3A.4) of National Instrument 33-105 *Underwriting Conflicts* (**NI 33-105**), the underwriters are not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

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#### LEGAL MATTERS
The validity of the ordinary shares being offered by this prospectus has been passed upon for us by Walkers, 190 Elgin Avenue, George Town, Grand Cayman KY1-9001, Cayman Islands. Certain other matters will be passed upon for us by Latham & Watkins LLP. Cooley LLP, New York, New York, is counsel to the underwriters in connection with this offering.

#### EXPERTS
The consolidated financial statements of MeiraGTx Holdings plc and subsidiaries appearing in MeiraGTx Holdings plc's [Annual Report on Form 10-K for the year ended December 31, 2025](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000110465926036494/mgtx-20251231x10k.htm) have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such report given on the authority of such firm as experts in accounting and auditing.

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#### PROSPECTUS
![[MISSING IMAGE: lg_meiragtx-4c.jpg]](lg_meiragtx-4c.jpg)

### $250,000,000

### Ordinary shares

### Preferred shares

### Warrants

### Purchase contracts

### Units
We may offer and sell up to $250,000,000 in the aggregate of the securities identified above from time to time in one or more offerings. This prospectus provides you with a general description of the securities.

Each time we offer and sell securities, we will provide a supplement to this prospectus that contains specific information about the offering and the amounts, prices and terms of the securities. The supplement may also add, update or change information contained in this prospectus with respect to that offering. You should carefully read this prospectus and the applicable prospectus supplement before you invest in any of our securities.

We may offer and sell the securities described in this prospectus and any prospectus supplement to or through one or more underwriters, dealers and agents, or directly to purchasers, or through a combination of these methods. If any underwriters, dealers or agents are involved in the sale of any of the securities, their names and any applicable purchase price, fee, commission or discount arrangement between or among them will be set forth, or will be calculable from the information set forth, in the applicable prospectus supplement. See the sections of this prospectus entitled "About this Prospectus" and "Plan of Distribution" for more information. No securities may be sold without delivery of this prospectus and the applicable prospectus supplement describing the method and terms of the offering of such securities.

 **INVESTING IN OUR SECURITIES INVOLVES RISKS. SEE THE "RISK FACTORS" ON PAGE [6](#tRIFA) OF THIS PROSPECTUS AND ANY SIMILAR SECTION CONTAINED IN THE APPLICABLE PROSPECTUS SUPPLEMENT CONCERNING FACTORS YOU SHOULD CONSIDER BEFORE INVESTING IN OUR SECURITIES.** 

Our ordinary shares are listed on The Nasdaq Global Select Market under the symbol "*MGTX*." On December 18, 2023, the last reported sale price of our ordinary shares on The Nasdaq Global Select Market was $4.52 per share.

 **Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.** 

#### The date of this prospectus is December 29, 2023.

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#### **TABLE OF CONTENTS**

---

| | |
|:---|:---|
| [ABOUT THIS PROSPECTUS](#tATP)  | [1](#tATP) |
| [SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS](#tSNRF)  | [2](#tSNRF) |
| [WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE](#tWYCF)  | [3](#tWYCF) |
| [PROSPECTUS SUMMARY](#tPRSU)  | [5](#tPRSU) |
| [RISK FACTORS](#tRIFA)  | [6](#tRIFA) |
| [USE OF PROCEEDS](#tUOP)  | [7](#tUOP) |
| [DESCRIPTION OF SHARE CAPITAL](#tDOSC)  | [8](#tDOSC) |
| [DESCRIPTION OF WARRANTS](#tDOW)  | [16](#tDOW) |
| [DESCRIPTION OF PURCHASE CONTRACTS](#tDOPC)  | [17](#tDOPC) |
| [DESCRIPTION OF UNITS](#tDOU)  | [18](#tDOU) |
| [GLOBAL SECURITIES](#tGLSE)  | [19](#tGLSE) |
| [PLAN OF DISTRIBUTION](#tPOD)  | [23](#tPOD) |
| [LEGAL MATTERS](#tLEMA)  | [25](#tLEMA) |
| [EXPERTS](#tEXP)  | [25](#tEXP) |

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#### ABOUT THIS PROSPECTUS
This prospectus is part of a registration statement that we filed with the U.S. Securities and Exchange Commission, or the SEC, using a "shelf" registration process. By using a shelf registration statement, we may sell securities from time to time and in one or more offerings up to a total dollar amount of $250,000,000 as described in this prospectus. Each time that we offer and sell securities, we will provide a prospectus supplement to this prospectus that contains specific information about the securities being offered and sold and the specific terms of that offering. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to these offerings. The prospectus supplement or free writing prospectus may also add, update or change information contained in this prospectus with respect to that offering. If there is any inconsistency between the information in this prospectus and the applicable prospectus supplement or free writing prospectus, you should rely on the prospectus supplement or free writing prospectus, as applicable. Before purchasing any securities, you should carefully read both this prospectus and the applicable prospectus supplement (and any applicable free writing prospectuses), together with the additional information described under the heading "Where You Can Find More Information; Incorporation by Reference."

We have not authorized anyone to provide you with any information or to make any representations other than those contained in this prospectus, any applicable prospectus supplement or any free writing prospectuses prepared by or on behalf of us or to which we have referred you. We take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. We will not make an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus and the applicable prospectus supplement to this prospectus is accurate only as of the date on its respective cover, that the information appearing in any applicable free writing prospectus is accurate only as of the date of that free writing prospectus, and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference, unless we indicate otherwise. Our business, financial condition, results of operations and prospects may have changed since those dates. This prospectus incorporates by reference, and any prospectus supplement or free writing prospectus may contain and incorporate by reference, market data and industry statistics and forecasts that are based on independent industry publications and other publicly available information. Although we believe these sources are reliable, we do not guarantee the accuracy or completeness of this information and we have not independently verified this information. In addition, the market and industry data and forecasts that may be included or incorporated by reference in this prospectus, any prospectus supplement or any applicable free writing prospectus may involve estimates, assumptions and other risks and uncertainties and are subject to change based on various factors, including those discussed under the heading "Risk Factors" contained in this prospectus, the applicable prospectus supplement and any applicable free writing prospectus, and under similar headings in other documents that are incorporated by reference into this prospectus. Accordingly, investors should not place undue reliance on this information.

Unless the context otherwise requires, references in this prospectus to "Meira," "MeiraGTx," "we," "us," "our" or "the Company" refer to MeiraGTx Holdings plc and its subsidiaries.

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#### SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
This prospectus and the information incorporated by reference in this prospectus contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this prospectus and the information incorporated by reference in this prospectus that do not relate to matters of historical fact should be considered forward-looking statements, including, without limitation, statements regarding expectations regarding meetings with global regulatory authorities and the FDA, product pipeline, anticipated product benefits, goals and strategic priorities, product candidate development and status and expectations relating to clinical trials, growth expectations or targets, pre-clinical and clinical data expectations in respect of collaborations and expectations related to financing arrangements and the intended use of proceeds thereunder, 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 expectations at the time such statements are made. 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, the important factors discussed under the heading "Risk Factors" in any of our filings with the SEC pursuant to Section 13(a), 13(c) 14 or 15(d) of the Securities Exchange Act of the 1934, as amended (the "Exchange Act"). These and other important factors could cause actual results to differ materially from those indicated by the forward-looking statements made in this prospectus and the information incorporated by reference in this prospectus. Any such forward-looking statements represent management's estimates as of the date of the relevant document. 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 such statements are made.

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#### WHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCE

#### Available Information
We are subject to the informational requirements of the Exchange Act, and are required to file reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information about issuers, such as us, who file electronically with the SEC. The address of that website is *http://www.sec.gov*.

Our website address is *www.meiragtx.com*. The information on our website, however, is not, and should not be deemed to be, a part of this prospectus.

This prospectus and any prospectus supplement are part of a registration statement that we filed with the SEC and do not contain all of the information in the registration statement. The full registration statement may be obtained from the SEC or us, as provided below. Forms of the documents establishing the terms of the offered securities are or may be filed as exhibits to the registration statement or documents incorporated by reference in the registration statement. Statements in this prospectus or any prospectus supplement about these documents are summaries and each statement is qualified in all respects by reference to the document to which it refers. You should refer to the actual documents for a more complete description of the relevant matters. You may inspect a copy of the registration statement through the SEC's website, as provided above.

#### Incorporation by Reference
The SEC's rules allow us to "incorporate by reference" information into this prospectus, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is deemed to be part of this prospectus, and subsequent information that we file with the SEC will automatically update and supersede that information. Any statement contained in this prospectus or a previously filed document incorporated by reference will be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus or a subsequently filed document incorporated by reference modifies or replaces that statement.

This prospectus and any accompanying prospectus supplement incorporate by reference the documents set forth below that have previously been filed with the SEC (other than those documents or the portions of those documents not deemed to be filed):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • [Our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on March 14, 2023;](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023003674/mgtx-20221231x10k.htm)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Our Quarterly Reports on Form 10-Q for the quarter ended March 31, 2023, filed with the SEC on [May 11, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023009274/mgtx-20230331x10q.htm), for the quarter ended June 30, 2023, filed with the SEC on [August 10, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023014416/mgtx-20230630x10q.htm) and for the quarter ended September 30, 2023, filed with the SEC on [November 14, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023018916/mgtx-20230930x10q.htm).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • The information specifically incorporated by reference into our [Annual Report on Form 10-K for the year ended December 31, 2022](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023003674/mgtx-20221231x10k.htm) from our [Definitive Proxy Statement on Schedule 14A, filed with the SEC on April 27, 2023](https://www.sec.gov/Archives/edgar/data/1735438/000155837023006972/tmb-20230608xdef14a.htm);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • Our Current Reports on Form 8-K, filed with the SEC on [April 26, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023006872/mgtx-20230421x8k.htm), [May 9, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023008883/mgtx-20230503x8k.htm), [June 12, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023010991/mgtx-20230608x8k.htm), [August 10, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023014412/mgtx-20230810x8k.htm), [October 30, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023016977/mgtx-20231030x8k.htm) and [December 21, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023019944/mgtx-20231220x8k.htm); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • The description of our ordinary shares contained in our [Registration Statement on Form 8-A, dated June 8, 2018](https://www.sec.gov/Archives/edgar/data/1735438/000119312518187284/d602941d8a12b.htm), filed with the SEC on June 8, 2018 and any amendment or report filed with the SEC for the purpose of updating the description.

All reports and other documents we subsequently file pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the termination of this offering, including all such documents we may file with the SEC after the date of the initial registration statement and prior to the effectiveness of the registration statement, but excluding any information furnished to, rather than filed with, the SEC, will also be incorporated by reference into this prospectus and deemed to be part of this prospectus from the date of

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the filing of such reports and documents. We are not, however, incorporating by reference any documents or portions thereof, whether specifically listed above or filed in the future, that are not deemed "filed" with the SEC, including our stock performance graph or any information furnished pursuant to Items 2.02 or 7.01 of Form 8-K or related exhibits furnished pursuant to Item 9.01 of Form 8-K.

You may request a free copy of any of the documents incorporated by reference in this prospectus by writing or telephoning us at the following address:

MeiraGTx Holdings plc

450 East 29th Street, 14th Floor

New York, New York 10016

(646) 860-7985

Exhibits to the filings will not be sent, however, unless those exhibits have specifically been incorporated by reference in this prospectus or any accompanying prospectus supplement.

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#### PROSPECTUS SUMMARY

#### The Company
We are a vertically integrated, clinical-stage gene therapy company with six programs in clinical development and a broad pipeline of preclinical and research programs. We have core capabilities in viral vector design and optimization and gene therapy manufacturing, and a transformative gene regulation platform technology that allows precise, dose responsive control of gene expression by oral small molecules with dynamic range that can exceed 5000-fold. Led by an experienced management team, we have taken a portfolio approach by licensing, acquiring and developing technologies that give us depth across both product candidates and indications. Our initial focus is on three distinct areas of unmet medical need: ocular diseases, including both inherited retinal diseases as well as large degenerative ocular diseases, neurodegenerative diseases, and severe forms of xerostomia. Though initially focusing on the eye, central nervous system and salivary gland, we plan to expand our focus in the future to develop additional gene therapy treatments for patients suffering from a range of serious diseases.

MeiraGTx Holdings plc was formed on May 1, 2018 under the laws of the Cayman Islands. Our predecessor, MeiraGTx Limited, a limited company under the laws of England and Wales, was formed on March 20, 2015. In connection with our initial public offering, we reorganized whereby MeiraGTx Limited became a wholly owned subsidiary of MeiraGTx Holdings plc.

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#### RISK FACTORS
Investment in any securities offered pursuant to this prospectus and the applicable prospectus supplement involves risks. You should carefully consider the risk factors incorporated by reference to our most recent Annual Report on Form 10-K and any subsequent Quarterly Reports on Form 10-Q or Current Reports on Form 8-K we have filed and will file after the date of this prospectus, and all other information contained or incorporated by reference into this prospectus, as updated by our subsequent filings under the Exchange Act, and the risk factors and other information contained in the applicable prospectus supplement and any applicable free writing prospectus before acquiring any of such securities. The occurrence of any of these risks might cause you to lose all or part of your investment in the offered securities. There may be other unknown or unpredictable economic, business, competitive, regulatory or other factors that could have material adverse effects on our future results. Past financial performance may not be a reliable indicator of future performance, and historical trends should not be used to anticipate results or trends in future periods. If any of these risks actually occurs, our business, financial condition, results of operations or cash flow could be seriously harmed. This could cause the trading price of our securities to decline, resulting in a loss of all or part of your investment. Please also carefully read the section entitled "Special Note Regarding Forward-Looking Statements" included in our most recent Annual Report on Form 10-K and any subsequent Quarterly Reports on Form 10-Q or Current Reports on Form 8-K.

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#### USE OF PROCEEDS
We intend to use the net proceeds from the sale of the securities as set forth in the applicable prospectus supplement.

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#### DESCRIPTION OF SHARE CAPITAL

#### Share Capital
The authorized share capital of MeiraGTx Holdings plc consists of $50,000 divided into 1,288,327,750 shares, nominal value $0.00003881 per share. As of September 30, 2023, there were 59,597,151 ordinary shares issued and outstanding.

#### Ordinary Shares

#### General
All of our issued and outstanding ordinary shares are fully paid and non-assessable. Certificates representing our issued and outstanding ordinary shares are generally not issued and legal title to our issued shares is recorded in registered form in the register of members. Holders of our ordinary shares have no preemptive, subscription, redemption or conversion rights.

Our board of directors may provide for other classes of shares, including classes of preferred shares, out of our authorized but unissued share capital, which could be utilized for a variety of corporate purposes, including future offerings to raise capital for corporate purposes or for use in employee benefit plans. Such additional classes of shares shall have such rights, restrictions, preferences, privileges and payment obligations as determined by our board of directors. If we issue any preferred shares, the rights, preferences and privileges of holders of our ordinary shares will be subject to, and may be adversely affected by, the rights of the holders of such preferred shares. See "— Variation of rights."

#### Dividends
The holders of our ordinary shares are entitled to such dividends as may be declared by our board of directors subject to the Companies Act (as amended) of the Cayman Islands (the "Companies Law"), and our amended and restated memorandum and articles of association. Dividends and other distributions on issued and outstanding ordinary shares may be paid out of the funds of the Issuer lawfully available for such purpose, subject to any preference of any outstanding shares and the contractual limitations in our outstanding indebtedness. Dividends and other distributions will be distributed among the holders of our ordinary shares on a pro rata basis.

#### Voting rights
Voting at any shareholders' meeting is by show of hands, unless voting by way of poll demanded by the chairman of the board of directors or any shareholder present or voting by proxy. On a show of hands every shareholder present in person or by proxy shall have one vote and on a poll every shareholder present in person or by proxy shall have one vote for each ordinary share on all matters upon which the ordinary shares are entitled to vote.

A quorum required for a meeting of shareholders consists of holders with at least one-third of the votes eligible to be cast at any such general meeting of the Issuer.

An ordinary resolution to be passed by the shareholders requires the affirmative vote of a simple majority of the votes cast by persons present (in person or by proxy) and voting in a general meeting at which a quorum is present, while a special resolution requires the affirmative vote of not less than two thirds of the votes cast by persons present (in person or by proxy) and voting in a general meeting at which a quorum is present. An ordinary resolution or a special resolution may also be adopted by way of unanimous written resolution signed by or on behalf of each shareholder who would have been entitled to vote on such matter at a general meeting without a meeting being held. A special resolution will be required for matters such as certain merger or consolidation transactions, the change of name of the Company, making changes to our amended and restated memorandum and articles of association, or the voluntary winding up of the Company.

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#### Variation of rights
The rights attached to any class of shares (unless otherwise provided by the terms of issue of that class), such as voting, dividends and the like, may only be materially and adversely varied or abrogated with the sanction of a resolution passed by not less than two-thirds of the votes attaching to the shares of the relevant class cast in a meeting of the holders of the shares of that class, or by the written consent of the holders of not less than two-thirds of the shares of that class. The rights conferred upon the holders of the shares of any class shall not (unless otherwise provided by the terms of issue of that class) be deemed to be varied by the creation or issue of further shares ranking in priority to or pari passu with such previously existing shares.

#### Transfer of ordinary shares
Any of our shareholders may transfer all or any of his or her ordinary shares by an instrument of transfer in the usual or common form or any other form approved by our board of directors, subject to the applicable restrictions of our amended and restated memorandum and articles of association, such as the suspension of transfers for a period immediately preceding a general meeting, or the determination that a proposed transfer is not eligible.

#### Liquidation
On a return of capital on winding up or otherwise (other than on conversion, redemption or purchase of ordinary shares), assets available for distribution among the holders of ordinary shares shall be distributed among the holders of the ordinary shares on a pro rata basis.

#### Directors
The management of our Company is vested in our board of directors. The quorum necessary for any meeting of our board of directors shall consist of at least a majority of the members of our board of directors and questions arising at any meeting shall be decided by a majority of votes.

Our amended and restated memorandum and articles of association provide that our board of directors will be divided into three classes with staggered, three-year terms. At each annual meeting of shareholders, the successors to directors whose terms then expire will be elected to serve from the time of election and qualification until the third annual meeting following election. The election of directors shall be by a plurality of the votes of the shares entitled to vote on the election of directors.

In addition, subject to the maximum number of directors designated by resolution of the board of directors, additional directors may be appointed from time to time by the board of directors or by ordinary resolution either as a result of a casual vacancy or as an additional director.

Directors may be removed or replaced by an ordinary resolution of the shareholders.

#### Indemnity of directors and officers
Our amended and restated memorandum and articles of association provide that our board of directors and officers shall be indemnified from and against all liability which they incur in execution of their duty in their respective offices, except liability incurred by reason of such director's or officer's dishonesty, willful default or fraud.

#### Differences in Corporate Law
Cayman Islands companies are governed by the Companies Law. The Companies Law is modeled on English law but does not follow recent English Law statutory enactments, and differs from laws applicable to United States corporations and their shareholders. Set forth below is a summary of some significant differences between the provisions of the Companies Law applicable to us and, for comparison purposes, the laws applicable to companies incorporated in the State of Delaware and their shareholders.

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#### Mergers and similar arrangements
The Companies Law allows for the merger of two or more companies into either one consolidated company or one or more company(ies) merged into another so as to form a single surviving company. The merger or consolidation of two or more companies under Cayman Islands law requires the directors of the companies to enter into and to approve a written plan of merger or consolidation, which must also be authorized by a special resolution of each constituent company, in which regard see "— Ordinary Shares — Voting Rights" above, and such other authorization, if any, as may be specified in such companies' articles of association. In relation to any merger or consolidation under the Companies Law, dissenting shareholders have certain limited appraisal rights in circumstances which are similar to those available to dissenting shareholders of a Delaware corporation, providing rights to receive payment in cash for the judicially determined fair value of the shares. Appraisal rights are ordinarily available where the consideration offered under the merger is payable in cash or, in some instances, the unlisted securities of a third party.

The Companies Law also includes statutory provisions that facilitate the reconstruction and amalgamation of companies, provided that such a scheme of arrangement is approved by (i) in respect of shareholders, 75% in value of the shareholders or each class of shareholders who attend and vote, either in person or by proxy, at a meeting or meetings convened for that purpose; or (ii) in respect of creditors, a majority in number representing 75% in value of creditors or each class of creditors who attend and vote, either in person or by proxy, at a meeting or meetings convened for that purpose. The convening of meetings to consider any such scheme of arrangement, and the implementation of the scheme, must be sanctioned by the Grand Court of the Cayman Islands. While a dissenting shareholder has the right to express to the court the view that the transaction ought not to be approved, the court can be expected to approve the arrangement if it determines that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the company is not proposing to act illegally or beyond the scope of its corporate authority and the statutory provisions as to the dual majority vote have been met;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the shareholders have been fairly represented at the meeting in question and the classes properly delineated;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the arrangement is such that a businessman would reasonably approve; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the arrangement is not one that would more properly be sanctioned under some other provision of the Companies Law or that would amount to a "fraud on the minority".

If a scheme of arrangement is thus approved, the dissenting shareholders would have no rights comparable to appraisal rights, which would otherwise ordinarily be available to dissenting shareholders of a Delaware corporation.

When a tender offer to acquire shares is made and accepted (within four months) by holders of not less than 90% of the shares subject to such offer, the offeror may, within a two-month period following the expiration of the initial four month period, require the holders of the remaining shares to transfer such shares on the terms of the offer. An objection can be made to the Grand Court of the Cayman Islands but this is unlikely to succeed unless there is evidence of fraud, bad faith, collusion or inequitable treatment of shareholders.

#### Shareholders' suits
We are not aware of any reported class action having been brought in a Cayman Islands court. Derivative actions have been brought in the Cayman Islands courts, and the Cayman Islands courts have confirmed the availability for such actions. In principle, we will normally be the proper plaintiff and a derivative action may not be brought by a shareholder. However, based on English authorities, which would in all likelihood be of persuasive authority in the Cayman Islands, there are exceptions to the foregoing principle, including when:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a company acts or proposes to act illegally or ultra vires (beyond the scope of its authority);

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the act complained of, although not ultra vires, could be effected if duly authorized by a special resolution that has not been obtained; and

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • those who control the company are perpetrating a "fraud on the minority."

#### Fiduciary duties of directors
Under Delaware corporate law, a director of a Delaware corporation has a fiduciary duty to the corporation and its shareholders. This duty has two components, the duty of care and the duty of loyalty. The duty of care requires that a director act in good faith, with the care that an ordinarily prudent person would exercise under similar circumstances. Under this duty, a director must inform himself of, and disclose to shareholders, all material information reasonably available regarding a significant transaction. The duty of loyalty requires that a director must act in a manner he or she reasonably believes to be in the best interests of the corporation. A director must not use his or her corporate position for personal gain or advantage. This duty prohibits self-dealing by a director and mandates that the best interests of the corporation and its shareholders take precedence over any interest possessed by a director, officer or controlling shareholder and not shared by the shareholders generally. In general, actions of a director are presumed to have been made on an informed basis, in good faith and in the honest belief that the action taken was in the best interests of the corporation. However, this presumption may be rebutted by evidence of a breach of one of the fiduciary duties. Should such evidence be presented concerning a transaction by a director, the director must prove the procedural fairness of the transaction and that the transaction was of fair value to the corporation.

As a matter of Cayman Islands law, a director of a Cayman Islands company is in the position of a fiduciary with respect to the company and therefore it is considered that he owes the following duties to the company: a duty to act in good faith and in what he considers to be in the best interests of the company; a duty not to make a profit out of his position as director (unless the company permits him to do so); a duty to exercise his powers for the purposes for which they are conferred; and a duty not to put himself in a position where the interests of the company conflict with his personal interest or his duty to a third party. A director of a Cayman Islands company owes to the company a duty to act with skill and care. A director will need to exhibit in the performance of his duties both the degree of skill that may reasonably be expected from a subjective perspective determined by reference to his knowledge and experience and the skill and care objectively to be expected from a person occupying office as a director of the company.

Under our amended and restated memorandum and articles of association, directors who are in any way, whether directly or indirectly, interested in a contract or proposed contract with our company must declare the nature of their interest at a meeting of the board of directors. Following such declaration, a director may vote in respect of any contract or proposed contract notwithstanding his interest; provided that, in exercising any such vote, such director's duties remain as described above.

#### Written consent of shareholders
Under Delaware corporate law, unless otherwise provided in the certificate of incorporation, any action to be taken at any annual or special meeting of shareholders of a corporation may be taken by written consent of the holders of outstanding stock having not less than the minimum number of votes that would be necessary to take that action at a meeting at which all shareholders entitled to vote were present and voted. In addition, a corporation may eliminate the right of shareholders to act by written consent through amendment to its certificate of incorporation.

Cayman Islands law and our amended and restated memorandum and articles of association provide that shareholders may adopt an ordinary resolution or a special resolution by way of unanimous written resolution signed by or on behalf of each shareholder who would have been entitled to vote on such matter at a general meeting without a meeting being held.

#### Shareholder proposals
Under Delaware corporate law, a shareholder has the right to put any proposal before the shareholders at the annual meeting, provided that such shareholder complies with the notice provisions in the governing documents. A special meeting may be called by the board of directors or any other person authorized to do so in the governing documents, but shareholders may be precluded from calling special meetings.

Under the laws of the Cayman Islands, a shareholder can only put a proposal before the shareholders at any general meeting in respect of any matter requiring a special resolution if it is set out in the notice

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calling the meeting. There is no right to introduce new business in respect of any matter requiring a special resolution at any meeting. A general meeting may be called by the board of directors or any other person authorized to do so in the articles of association, but shareholders may be precluded from calling general meetings. Under our amended and restated memorandum and articles of association, general meetings shall also be convened on the requisition in writing of any shareholder or shareholders entitled to attend and vote at general meetings of the company and to exercise at least a majority of the voting power permitted to be exercised at any such meeting, deposited at the office specifying the objects of the meeting for a date no later than 21 days from the date of deposit of the requisition signed by such shareholders, and if the directors do not convene such meeting for a date not later than 45 days after the date of such deposit, such shareholders themselves may convene the general meeting in the same manner, as nearly as possible, as that in which general meetings may be convened by the directors, and all reasonable expenses incurred by such shareholders as a result of the failure of the directors to convene the general meeting shall be reimbursed to them by the company. As an exempted Cayman Islands company, we are not obliged by law to call shareholders' annual general meetings.

Under Delaware corporate law, a corporation is required to set a minimum quorum of one-third of the issued and outstanding shares for a shareholders meeting. Cayman Islands law permits a company's articles to have any quorum. See "— Ordinary Shares — Voting Rights."

#### Cumulative voting
Under Delaware corporate law, cumulative voting for elections of directors is not permitted unless the corporation's certificate of incorporation specifically provides for it. Cumulative voting potentially facilitates the representation of minority shareholders on a board of directors since it permits a minority shareholder to cast all the votes to which such shareholder is entitled on a single director, which increases such shareholder's voting power with respect to electing such director.

There are no prohibitions in relation to cumulative voting under the laws of the Cayman Islands, but our amended and restated memorandum and articles of association do not provide for cumulative voting. As a result, our shareholders are not afforded any less protection or fewer rights on this issue than shareholders of a Delaware corporation.

#### Election and removal of directors
Under Delaware corporate law, unless otherwise specified in the certificate of incorporation or bylaws of a corporation, directors are elected by a plurality of the votes of the shares entitled to vote on the election of directors and may be removed with or without cause (or, with respect to a classified board, only with cause unless the certificate of incorporation provides otherwise) by the approval of a majority of the outstanding shares entitled to vote.

Similarly, as permitted by the Companies Law and pursuant to our amended and restated memorandum and articles of association, our board of directors will be divided into three classes with staggered, three-year terms. At each annual meeting of shareholders, the successors to directors whose terms then expire will be elected to serve from the time of election and qualification until the third annual meeting following election. The election of directors shall be by a plurality of the votes of the shares entitled to vote on the election of directors.

In addition, subject to the maximum number of directors designated by resolution of the board of directors, additional directors may be appointed from time to time by the board of Directors or by ordinary resolution either as a result of a casual vacancy or as an additional director.

Directors may be removed or replaced by an ordinary resolution of the shareholders.

#### Written consent of directors
Under Delaware corporate law, a written consent of the directors must be unanimous to take effect. The position under our amended and restated memorandum and articles of association is the same in this regard.

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#### Indemnification of directors and executive officers and limitation of liability
Cayman Islands law does not limit the extent to which a company's amended and restated memorandum and articles of association may provide for indemnification of officers and directors, except to the extent any such provision may be held by the Cayman Islands courts to be contrary to public policy, such as to provide indemnification against civil fraud or the consequences of committing a crime. Our amended and restated memorandum and articles of association provide that our board of directors and officers shall be indemnified from and against all liability which they incur in execution of their duty in their respective offices, except liability incurred by reason of such directors' or officers' dishonesty, willful default or fraud. This standard of conduct is generally the same as permitted under Delaware corporate law.

#### Enforcement of civil liabilities
The Cayman Islands has a less developed body of securities laws as compared to the United States and provides less protection to investors. Additionally, Cayman Islands companies may not have standing to sue before the Federal courts of the United States. Although there is no statutory enforcement in the Cayman Islands of judgments obtained in the United States, the courts of the Cayman Islands will recognize a foreign judgment as the basis for a claim at common law in the Cayman Islands provided such judgment:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • is one in respect of which the foreign court had jurisdiction over the defendant according to Cayman Islands conflict of law rules;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • is final and conclusive;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • is either for a liquidated sum not in respect of penalties or taxes or a fine or similar fiscal or revenue obligations or, in certain circumstances, for *in personam* non-money relief; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • was neither obtained in a manner, nor is of a kind enforcement of which is contrary to natural justice or the public policy of the Cayman Islands.

As a result of English case law, which will likely be highly persuasive in the Cayman Islands, the Cayman Islands Courts may also have discretion to enforce judgments obtained in foreign bankruptcy proceedings in other circumstances.

#### Anti-Money Laundering, Counter-Terrorism Financing, Prevention of Proliferation Financing and Financial Sanctions Compliance — Cayman Islands
If any person resident in the Cayman Islands knows or suspects, or has reasonable grounds for knowing or suspecting, that another person is engaged in criminal conduct, is involved with terrorism or terrorist property or proliferation financing or is the business combination partner of a financial sanction and the information for that knowledge or suspicion came to their attention in the course of business in the regulated sector or other trade, profession, business or employment, the person will be required to report such knowledge or suspicion to (i) the Financial Reporting Authority of the Cayman Islands, pursuant to the Proceeds of Crime Act (as amended) of the Cayman Islands if the disclosure relates to criminal conduct, money laundering or proliferation financing or is the business combination partner of a financial sanction; or (ii) a police officer of the rank of constable or higher, or the Financial Reporting Authority, pursuant to the Terrorism Act (as amended) of the Cayman Islands, if the disclosure relates to involvement with terrorism or terrorist financing and property. Such a report will not be treated as a breach of confidence or of any restriction upon the disclosure of information imposed by any enactment or otherwise. We reserve the right to refuse to make any payment to a shareholder if our directors or officers suspect or are advised that the payment to such shareholder might result in a breach of applicable anti-money laundering, counterterrorist financing, prevention of proliferation financing and financial sanctions or other laws or regulations by any person in any relevant jurisdiction, or if such refusal is considered necessary or appropriate to ensure our compliance with any such laws or regulations in any applicable jurisdiction.

#### Variation of rights of shares
Under Delaware corporate law, a corporation may vary the rights of a class of shares with the approval of a majority of the outstanding shares of such class, unless the certificate of incorporation provides otherwise.

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Under Cayman Islands law and our amended and restated memorandum and articles of association, if our share capital is divided into more than one class of shares, we may only materially and adversely vary or abrogate the rights attached to any class with the sanction of a resolution passed by not less than two-thirds of the votes attaching to the shares of the relevant class cast in a meeting of the holders of the shares of that class, or by the written consent of the holders of not less than two-thirds of the shares of that class.

#### Sale of assets
Under Delaware corporate law, a vote of the shareholders is required to approve a sale of assets only when all or substantially all assets are being sold to a person other than a subsidiary of the company.

The Companies Law contains no specific restrictions on the powers of directors to dispose of assets of a company. As a matter of general law, in the exercise of those powers, the directors must discharge their duties of care and to act in good faith, for a proper purpose and in the interests of the company.

#### Transactions with interested shareholders
The Delaware General Corporation Law contains a business combination statute applicable to Delaware corporations whereby, unless the corporation has specifically elected not to be governed by such statute by amendment to its certificate of incorporation, it is prohibited from engaging in certain business combinations with an "interested shareholder" for three years following the date that such person becomes an interested shareholder. An interested shareholder generally is a person or a group who or which owns or owned 15% or more of the target's outstanding voting stock within the past three years.

This has the effect of limiting the ability of a potential acquirer to make a two-tiered bid for the target in which all shareholders would not be treated equally. The statute does not apply if, among other things, prior to the date on which such shareholder becomes an interested shareholder, the board of directors approves either the business combination or the transaction which resulted in the person becoming an interested shareholder. This encourages any potential acquirer of a Delaware corporation to negotiate the terms of any acquisition transaction with the target's board of directors.

Cayman Islands law has no comparable statute. As a result, we cannot avail ourselves of the types of protections afforded by the Delaware business combination statute. However, although Cayman Islands law does not regulate transactions between a company and its significant shareholders, it does provide that such transactions must be entered into bona fide in the best interests of the company and not with the effect of constituting a fraud on the minority shareholders.

#### Rights of non-resident or foreign shareholders
There are no limitations imposed by our amended and restated memorandum and articles of association on the rights of non-resident or foreign shareholders to hold or exercise voting rights on our shares. As similarly provided under Delaware corporate law, there are no restrictions on foreign or non-resident ownership or management of a Cayman Islands exempted company under Cayman Islands law. In addition, there are no provisions in our amended and restated memorandum and articles of association governing the ownership threshold above which shareholder ownership must be disclosed.

#### Dissolution and winding up
Under the Delaware General Corporation Law, unless the board of directors approves the proposal to dissolve, dissolution must be approved by shareholders holding 100% of the total voting power of the corporation. Only if the dissolution is initiated by the board of directors may it be approved by a simple majority of the corporation's outstanding shares. Delaware law allows a Delaware corporation to include in its certificate of incorporation a supermajority voting requirement in connection with a dissolution initiated by the board of directors. Under the Companies Law and our amended and restated memorandum and articles of association, our company may be voluntarily dissolved, liquidated or wound up only by a special resolution of our shareholders, in which regard see "— Ordinary Shares — Voting Rights" above. In addition, a company may be wound up by the Grand Court of the Cayman Islands if the company is unable to pay its debts or if the court is of the opinion that it is just and equitable that our company is wound up.

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#### Inspection of books and records
Under Delaware corporate law, any shareholder of a corporation may for any proper purpose inspect or make copies of the corporation's stock ledger, list of shareholders and other books and records.

Our shareholders will have no general right under Cayman Islands law to inspect or obtain copies of our list of shareholders or corporate records except our memorandum and restated articles of association.

#### Amendment of governing documents
Under Delaware corporate law, a corporation's certificate of incorporation may be amended only if adopted and declared advisable by the board of directors and approved by a majority of the outstanding shares entitled to vote, and the bylaws may be amended with the approval of a majority of the outstanding shares entitled to vote and may, if so provided in the certificate of incorporation, also be amended by the board of directors. As permitted by Cayman Islands law, our amended and restated memorandum and articles of association may be amended with the sanction of a special resolution of shareholders.

#### Transfer Agent and Registrar
The transfer agent and registrar for our ordinary shares is Computershare Trust Company, N.A.

#### Stock Exchange Listing
Our ordinary shares are listed on the Nasdaq Global Select Market under the symbol "MGTX."

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#### DESCRIPTION OF WARRANTS
We may issue warrants for the purchase of our ordinary shares or preferred shares. We may issue warrants independently or together with other securities, and the warrants may be attached to or separate from any offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and the investors or a warrant agent. The following summary of material provisions of the warrants and warrant agreements are subject to, and qualified in their entirety by reference to, all the provisions of the warrant agreement and warrant certificate applicable to a particular series of warrants. The terms of any warrants offered under a prospectus supplement may differ from the terms described below. We urge you to read the applicable prospectus supplement and any related free writing prospectus, as well as the complete warrant agreements and warrant certificates that contain the terms of the warrants.

The particular terms of any issue of warrants will be described in the prospectus supplement relating to the issue.

Those terms may include:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the number of ordinary shares or preferred shares purchasable upon the exercise of warrants to purchase such shares and the price at which such number of shares may be purchased upon such exercise;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the designation, stated value and terms (including, without limitation, liquidation, dividend, conversion and voting rights) of the series of preferred shares purchasable upon exercise of warrants to purchase preferred shares;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the principal amount of debt securities that may be purchased upon exercise of a debt warrant and the exercise price for the warrants, which may be payable in cash, securities or other property;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the date, if any, on and after which the warrants and the related debt securities, preferred ordinary shares will be separately transferable;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the terms of any rights to redeem or call the warrants;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the date on which the right to exercise the warrants will commence and the date on which the right will expire;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • United States federal income tax consequences applicable to the warrants; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • any additional terms of the warrants, including terms, procedures, and limitations relating to the exchange, exercise and settlement of the warrants.

Holders of equity warrants will not be entitled to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • vote, consent or receive dividends;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • receive notice as shareholders with respect to any meeting of shareholders for the election of our directors or any other matter; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • exercise any rights as shareholders of MeiraGTx Holdings plc.

Each warrant will entitle its holder to purchase the principal amount of debt securities or the number of shares of preferred shares, as applicable, at the exercise price set forth in, or calculable as set forth in, the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, holders of the warrants may exercise the warrants at any time up to the specified time on the expiration date that we set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void.

A holder of warrant certificates may exchange them for new warrant certificates of different denominations, present them for registration of transfer and exercise them at the corporate trust office of the warrant agent or any other office indicated in the applicable prospectus supplement. Until any warrants to purchase debt securities are exercised, the holder of the warrants will not have any rights of holders of the debt securities that can be purchased upon exercise, including any rights to receive payments of principal, premium or interest on the underlying debt securities or to enforce covenants in the applicable indenture. Until any warrants to purchase ordinary shares or preferred shares are exercised, the holders of the warrants will not have any rights of holders of the underlying ordinary shares or preferred shares, including any rights to receive dividends or payments upon any liquidation, dissolution or winding up of the Company, if any.

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#### DESCRIPTION OF PURCHASE CONTRACTS
We may issue purchase contracts for the purchase or sale of debt or equity securities issued by us. Each purchase contract will entitle the holder thereof to purchase or sell, and obligate us to sell or purchase, on specified dates, such securities at a specified purchase price, which may be based on a formula, all as set forth in the applicable prospectus supplement. Any purchase contracts we issue will be physically settled by delivery of such securities. The applicable prospectus supplement will also specify the methods by which the holders may purchase or sell such securities and any acceleration, cancellation or termination provisions or other provisions relating to the settlement of a purchase contract.

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#### DESCRIPTION OF UNITS
We may issue units consisting of any combination of the other types of securities offered under this prospectus in one or more series. We may evidence each series of units by unit certificates that we will issue under a separate agreement. We may enter into unit agreements with a unit agent. Each unit agent will be a bank or trust company that we select. We will indicate the name and address of the unit agent in the applicable prospectus supplement relating to a particular series of units.

The following description, together with the additional information included in any applicable prospectus supplement, summarizes the general features of the units that we may offer under this prospectus. You should read any prospectus supplement and any free writing prospectus that we may authorize to be provided to you related to the series of units being offered, as well as the complete unit agreements that contain the terms of the units. Specific unit agreements will contain additional important terms and provisions and we will file as an exhibit to the registration statement of which this prospectus is a part, or will incorporate by reference from another report that we file with the SEC, the form of each unit agreement relating to units offered under this prospectus.

If we offer any units, certain terms of that series of units will be described in the applicable prospectus supplement, including, without limitation, the following, as applicable:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the title of the series of units;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • identification and description of the separate constituent securities comprising the units;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the price or prices at which the units will be issued;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • the date, if any, on and after which the constituent securities comprising the units will be separately transferable;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a discussion of certain United States federal income tax considerations applicable to the units; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • any other terms of the units and their constituent securities.

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#### GLOBAL SECURITIES

#### Book-Entry, Delivery and Form
Unless we indicate differently in any applicable prospectus supplement or free writing prospectus, the securities initially will be issued in book-entry form and represented by one or more global notes or global securities, or collectively, global securities. The global securities will be deposited with, or on behalf of, The Depository Trust Company, New York, New York, as depositary, or DTC, and registered in the name of Cede & Co., the nominee of DTC. Unless and until it is exchanged for individual certificates evidencing securities under the limited circumstances described below, a global security may not be transferred except as a whole by the depositary to its nominee or by the nominee to the depositary, or by the depositary or its nominee to a successor depositary or to a nominee of the successor depositary.

DTC has advised us that it is:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a limited-purpose trust company organized under the New York Banking Law;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a "banking organization" within the meaning of the New York Banking Law;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a member of the Federal Reserve System;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a "clearing corporation" within the meaning of the New York Uniform Commercial Code; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • a "clearing agency" registered pursuant to the provisions of Section 17A of the Exchange Act.

DTC holds securities that its participants deposit with DTC. DTC also facilitates the settlement among its participants of securities transactions, such as transfers and pledges, in deposited securities through electronic computerized book-entry changes in participants' accounts, thereby eliminating the need for physical movement of securities certificates. "Direct participants" in DTC include securities brokers and dealers, including underwriters, banks, trust companies, clearing corporations and other organizations. DTC is a wholly-owned subsidiary of The Depository Trust & Clearing Corporation, or DTCC. DTCC is the holding company for DTC, National Securities Clearing Corporation and Fixed Income Clearing Corporation, all of which are registered clearing agencies. DTCC is owned by the users of its regulated subsidiaries. Access to the DTC system is also available to others, which we sometimes refer to as indirect participants, that clear through or maintain a custodial relationship with a direct participant, either directly or indirectly. The rules applicable to DTC and its participants are on file with the SEC.

Purchases of securities under the DTC system must be made by or through direct participants, which will receive a credit for the securities on DTC's records. The ownership interest of the actual purchaser of a security, which we sometimes refer to as a beneficial owner, is in turn recorded on the direct and indirect participants' records. Beneficial owners of securities will not receive written confirmation from DTC of their purchases. However, beneficial owners are expected to receive written confirmations providing details of their transactions, as well as periodic statements of their holdings, from the direct or indirect participants through which they purchased securities. Transfers of ownership interests in global securities are to be accomplished by entries made on the books of participants acting on behalf of beneficial owners. Beneficial owners will not receive certificates representing their ownership interests in the global securities, except under the limited circumstances described below.

To facilitate subsequent transfers, all global securities deposited by direct participants with DTC will be registered in the name of DTC's partnership nominee, Cede & Co., or such other name as may be requested by an authorized representative of DTC. The deposit of securities with DTC and their registration in the name of Cede & Co. or such other nominee will not change the beneficial ownership of the securities. DTC has no knowledge of the actual beneficial owners of the securities. DTC's records reflect only the identity of the direct participants to whose accounts the securities are credited, which may or may not be the beneficial owners. The participants are responsible for keeping account of their holdings on behalf of their customers.

So long as the securities are in book-entry form, you will receive payments and may transfer securities only through the facilities of the depositary and its direct and indirect participants. We will maintain an office or agency in the location specified in the prospectus supplement for the applicable securities, where notices and demands in respect of the securities may be delivered to us and where certificated securities may be surrendered for payment, registration of transfer or exchange.

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Conveyance of notices and other communications by DTC to direct participants, by direct participants to indirect participants and by direct participants and indirect participants to beneficial owners will be governed by arrangements among them, subject to any legal requirements in effect from time to time.

Redemption notices will be sent to DTC. If less than all of the securities of a particular series are being redeemed, DTC's practice is to determine by lot the amount of the interest of each direct participant in the securities of such series to be redeemed.

Neither DTC nor Cede & Co. (or such other DTC nominee) will consent or vote with respect to the securities. Under its usual procedures, DTC will mail an omnibus proxy to us as soon as possible after the record date. The omnibus proxy assigns the consenting or voting rights of Cede & Co. to those direct participants to whose accounts the securities of such series are credited on the record date, identified in a listing attached to the omnibus proxy. So long as securities are in book-entry form, we will make payments on those securities to the depositary or its nominee, as the registered owner of such securities, by wire transfer of immediately available funds. If securities are issued in definitive certificated form under the limited circumstances described below and unless if otherwise provided in the description of the applicable securities herein or in the applicable prospectus supplement, we will have the option of making payments by check mailed to the addresses of the persons entitled to payment or by wire transfer to bank accounts in the United States designated in writing to the applicable trustee or other designated party at least 15 days before the applicable payment date by the persons entitled to payment, unless a shorter period is satisfactory to the applicable trustee or other designated party.

Redemption proceeds, distributions and dividend payments on the securities will be made to Cede & Co., or such other nominee as may be requested by an authorized representative of DTC. DTC's practice is to credit direct participants' accounts upon DTC's receipt of funds and corresponding detail information from us on the payment date in accordance with their respective holdings shown on DTC records. Payments by participants to beneficial owners will be governed by standing instructions and customary practices, as is the case with securities held for the account of customers in bearer form or registered in "street name." Those payments will be the responsibility of participants and not of DTC or us, subject to any statutory or regulatory requirements in effect from time to time. Payment of redemption proceeds, distributions and dividend payments to Cede & Co., or such other nominee as may be requested by an authorized representative of DTC, is our responsibility, disbursement of payments to direct participants is the responsibility of DTC, and disbursement of payments to the beneficial owners is the responsibility of direct and indirect participants.

Except under the limited circumstances described below, purchasers of securities will not be entitled to have securities registered in their names and will not receive physical delivery of securities. Accordingly, each beneficial owner must rely on the procedures of DTC and its participants to exercise any rights under the securities and the indenture.

The laws of some jurisdictions may require that some purchasers of securities take physical delivery of securities in definitive form. Those laws may impair the ability to transfer or pledge beneficial interests in securities.

DTC may discontinue providing its services as securities depositary with respect to the securities at any time by giving reasonable notice to us. Under such circumstances, in the event that a successor depositary is not obtained, securities certificates are required to be printed and delivered.

As noted above, beneficial owners of a particular series of securities generally will not receive certificates representing their ownership interests in those securities. However, if:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • DTC notifies us that it is unwilling or unable to continue as a depositary for the global security or securities representing such series of securities or if DTC ceases to be a clearing agency registered under the Exchange Act at a time when it is required to be registered and a successor depositary is not appointed within 90 days of the notification to us or of our becoming aware of DTC's ceasing to be so registered, as the case may be; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • we determine, in our sole discretion, not to have such securities represented by one or more global securities,

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • an Event of Default has occurred and is continuing with respect to such series of securities,

we will prepare and deliver certificates for such securities in exchange for beneficial interests in the global securities. Any beneficial interest in a global security that is exchangeable under the circumstances described in the preceding sentence will be exchangeable for securities in definitive certificated form registered in the names that the depositary directs. It is expected that these directions will be based upon directions received by the depositary from its participants with respect to ownership of beneficial interests in the global securities.

#### Euroclear and Clearstream
If so provided in the applicable prospectus supplement, you may hold interests in a global security through Clearstream Banking S.A., which we refer to as Clearstream, or Euroclear Bank S.A./N.V., as operator of the Euroclear System, which we refer to as Euroclear, either directly if you are a participant in Clearstream or Euroclear or indirectly through organizations that are participants in Clearstream or Euroclear. Clearstream and Euroclear will hold interests on behalf of their respective participants through customers' securities accounts in the names of Clearstream and Euroclear, respectively, on the books of their respective U.S. depositaries, which in turn will hold such interests in customers' securities accounts in such depositaries' names on DTC's books.

Clearstream and Euroclear are securities clearance systems in Europe. Clearstream and Euroclear hold securities for their respective participating organizations and facilitate the clearance and settlement of securities transactions between those participants through electronic book-entry changes in their accounts, thereby eliminating the need for physical movement of certificates.

Payments, deliveries, transfers, exchanges, notices and other matters relating to beneficial interests in global securities owned through Euroclear or Clearstream must comply with the rules and procedures of those systems. Transactions between participants in Euroclear or Clearstream, on the one hand, and other participants in DTC, on the other hand, are also subject to DTC's rules and procedures.

Investors will be able to make and receive through Euroclear and Clearstream payments, deliveries, transfers and other transactions involving any beneficial interests in global securities held through those systems only on days when those systems are open for business. Those systems may not be open for business on days when banks, brokers and other institutions are open for business in the United States.

Cross-market transfers between participants in DTC, on the one hand, and participants in Euroclear or Clearstream, on the other hand, will be effected through DTC in accordance with the DTC's rules on behalf of Euroclear or Clearstream, as the case may be, by their respective U.S. depositaries; however, such cross-market transactions will require delivery of instructions to Euroclear or Clearstream, as the case may be, by the counterparty in such system in accordance with the rules and procedures and within the established deadlines (European time) of such system. Euroclear or Clearstream, as the case may be, will, if the transaction meets its settlement requirements, deliver instructions to its U.S. depositary to take action to effect final settlement on its behalf by delivering or receiving interests in the global securities through DTC, and making or receiving payment in accordance with normal procedures for same-day fund settlement. Participants in Euroclear or Clearstream may not deliver instructions directly to their respective U.S. depositaries.

Due to time zone differences, the securities accounts of a participant in Euroclear or Clearstream purchasing an interest in a global security from a direct participant in DTC will be credited, and any such crediting will be reported to the relevant participant in Euroclear or Clearstream, during the securities settlement processing day (which must be a business day for Euroclear or Clearstream) immediately following the settlement date of DTC. Cash received in Euroclear or Clearstream as a result of sales of interests in a global security by or through a participant in Euroclear or Clearstream to a direct participant in DTC will be received with value on the settlement date of DTC but will be available in the relevant Euroclear or Clearstream cash account only as of the business day for Euroclear or Clearstream following DTC's settlement date.

#### Other
The information in this section of this prospectus concerning DTC, Clearstream, Euroclear and their respective book-entry systems has been obtained from sources that we believe to be reliable, but we do not

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take responsibility for this information. This information has been provided solely as a matter of convenience. The rules and procedures of DTC, Clearstream and Euroclear are solely within the control of those organizations and could change at any time. Neither we nor the trustee nor any agent of ours or of the trustee has any control over those entities and none of us takes any responsibility for their activities. You are urged to contact DTC, Clearstream and Euroclear or their respective participants directly to discuss those matters. In addition, although we expect that DTC, Clearstream and Euroclear will perform the foregoing procedures, none of them is under any obligation to perform or continue to perform such procedures and such procedures may be discontinued at any time. Neither we nor any agent of ours will have any responsibility for the performance or nonperformance by DTC, Clearstream and Euroclear or their respective participants of these or any other rules or procedures governing their respective operations.

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#### PLAN OF DISTRIBUTION
We may sell the securities from time to time pursuant to underwritten public offerings, negotiated transactions, block trades or a combination of these methods or through underwriters or dealers, through agents and/or directly to one or more purchasers. The securities may be distributed from time to time in one or more transactions:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • at a fixed price or prices, which may be changed;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • at market prices prevailing at the time of sale;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • at prices related to such prevailing market prices;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • at negotiated prices; or

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; • in privately negotiated transactions.

Each time that we sell securities covered by this prospectus, we will provide a prospectus supplement or supplements that will describe the method of distribution and set forth the terms and conditions of the offering of such securities, including the offering price of the securities and the proceeds to us, if applicable.

Offers to purchase the securities being offered by this prospectus may be solicited directly. Agents may also be designated to solicit offers to purchase the securities from time to time. Any agent involved in the offer or sale of our securities will be identified in a prospectus supplement.

If a dealer is utilized in the sale of the securities being offered by this prospectus, the securities will be sold to the dealer, as principal. The dealer may then resell the securities to the public at varying prices to be determined by the dealer at the time of resale.

If an underwriter is utilized in the sale of the securities being offered by this prospectus, an underwriting agreement will be executed with the underwriter at the time of sale and the name of any underwriter will be provided in the prospectus supplement that the underwriter will use to make resales of the securities to the public. In connection with the sale of the securities, we or the purchasers of securities for whom the underwriter may act as agent, may compensate the underwriter in the form of underwriting discounts or commissions. The underwriter may sell the securities to or through dealers, and those dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters and/or commissions from the purchasers for which they may act as agent.

Unless otherwise indicated in a prospectus supplement, an agent will be acting on a best efforts basis and a dealer will purchase securities as a principal, and may then resell the securities at varying prices to be determined by the dealer.

Any compensation paid to underwriters, dealers or agents in connection with the offering of the securities, and any discounts, concessions or commissions allowed by underwriters to participating dealers will be provided in the applicable prospectus supplement. Underwriters, dealers and agents participating in the distribution of the securities may be deemed to be underwriters within the meaning of the Securities Act and any discounts and commissions received by them and any profit realized by them on resale of the securities may be deemed to be underwriting discounts and commissions. We may enter into agreements to indemnify underwriters, dealers and agents against civil liabilities, including liabilities under the Securities Act, or to contribute to payments they may be required to make in respect thereof and to reimburse those persons for certain expenses.

Any ordinary shares will be listed on The Nasdaq Global Select Market, but any other securities may or may not be listed on a national securities exchange. To facilitate the offering of securities, certain persons participating in the offering may engage in transactions that stabilize, maintain or otherwise affect the price of the securities. This may include over-allotments or short sales of the securities, which involve the sale by persons participating in the offering of more securities than were sold to them. In these circumstances, these persons would cover such over-allotments or short positions by making purchases in the open market or by exercising their over-allotment option, if any. In addition, these persons may stabilize or maintain the price of the securities by bidding for or purchasing securities in the open market or by imposing penalty bids, whereby selling concessions allowed to dealers participating in the offering may be reclaimed if securities

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sold by them are repurchased in connection with stabilization transactions. The effect of these transactions may be to stabilize or maintain the market price of the securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time.

We may engage in "at-the-market" offerings into an existing trading market in accordance with Rule 415(a)(4) under the Securities Act. In addition, we may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement so indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third party may use securities pledged by us or borrowed from us or others to settle those sales or to close out any related open borrowings of securities, and may use securities received from us in settlement of those derivatives to close out any related open borrowings of securities. The third party in such sale transactions will be an underwriter and, if not identified in this prospectus, will be named in the applicable prospectus supplement (or a post-effective amendment). In addition, we may otherwise loan or pledge securities to a financial institution or other third party that in turn may sell the securities short using this prospectus and an applicable prospectus supplement. Such financial institution or other third party may transfer its economic short position to investors in our securities or in connection with a concurrent offering of other securities.

The specific terms of any lock-up provisions in respect of any given offering will be described in the applicable prospectus supplement.

The underwriters, dealers and agents may engage in transactions with us, or perform services for us, in the ordinary course of business for which they receive compensation.

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#### LEGAL MATTERS
The validity of the ordinary shares and preferred shares offered hereby will be passed upon for us by Walkers (Cayman) LLP. The validity of the warrants, purchase contracts and units offered hereby will be passed upon for us by Latham & Watkins LLP. Additional legal matters may be passed upon for us or any underwriters, dealers or agents, by counsel that we will name in the applicable prospectus supplement.

#### EXPERTS
The consolidated financial statements of MeiraGTx Holdings plc and subsidiaries appearing in MeiraGTx Holdings plc's [Annual Report on Form 10-K for the year ended December 31, 2022](https://www.sec.gov/ix?doc=/Archives/edgar/data/1735438/000155837023003674/mgtx-20221231x10k.htm) have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their report thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are, and audited financial statements to be included in subsequently filed documents will be, incorporated herein in reliance upon the report of Ernst & Young LLP pertaining to such financial statements (to the extent covered by consents filed with the Securities and Exchange Commission) given on the authority of such firm as experts in accounting and auditing.

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[**TABLE OF CONTENTS**](#TOC3)

### 11,111,111
![[MISSING IMAGE: lg_meiragtx-4c.jpg]](lg_meiragtx-4c.jpg)

### Ordinary Shares

#### PROSPECTUS SUPPLEMENT
 *Joint Book-Running Managers* 

### BofA Securities Goldman Sachs & Co. LLC
 *Co-Manager* 

### Raymond James

#### April 16, 2026

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