SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D/A

Under the Securities Exchange Act of 1934

(Amendment No. 6)*

MeiraGTx Holdings plc

(Name of Issuer)

Ordinary Shares, nominal value $0.00003881 per share

(Title of Class of Securities)

G59665 102

(CUSIP Number)

Alexander Rakitin

Perceptive Advisors LLC

51 Astor Place, 10^th Floor

New York, NY 10003

(646) 205-5340

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

August 12, 2024

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Section 240.13d-7 for other parties to whom copies are to be sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. G59665 102

CUSIP No. G59665 102

CUSIP No. G59665 102

Item 1 of the Schedule 13D is amended and restated as followed:

This Schedule 13D relates to the ordinary shares, $0.00003881 nominal value per share (“Ordinary Shares”), of MeiraGTx Holdings plc, an exempted company incorporated under the laws of the Cayman Islands (the “Company”), which has its principal executive offices at 450 East 29th Street, 14th Floor, New York, NY 10016.

Item 2 of the Schedule 13D is amended and restated as followed:

(a) This Amendment No. 6 to the Schedule 13D is being filed by Perceptive Advisors LLC (“Perceptive Advisors” or “Perceptive”), Joseph Edelman (“Mr. Edelman”) and Perceptive Life Sciences Master Fund, Ltd. (the “Master Fund”, and together with Perceptive Advisors and Mr. Edelman, each of the foregoing, a “Reporting Person,” and collectively, the “Reporting Persons”). Perceptive Advisors serves as the investment advisor to the Master Fund and Mr. Edelman is the managing member of Perceptive Advisors. The agreement among the Reporting Persons to file this Schedule 13D jointly in accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended, is attached as Exhibit 1 to the initial Schedule 13D filed June 22, 2018.

(b) The address of the principal business office of each of the Reporting Persons is 51 Astor Place 10th Floor, New York, NY 10003.

(c) The principal business of Perceptive Advisors is managing funds in connection with purchasing, holding and selling securities for investment purposes. The principal business of the Master Fund is to invest in securities. The principal occupation of Mr. Edelman is as the managing member of Perceptive Advisors and other related entities.

(d) During the last five years, none of the Reporting Persons, nor to the Reporting Persons’ knowledge, any of the persons listed on Schedule A to this Amendment No. 6 to Schedule 13D, has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Reporting Persons has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree of final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws, other than the previously announced settlement order entered into by Perceptive with the Securities and Exchange Commission dated September 6, 2022 (File No. 3-21031).

(f) Perceptive Advisors is a Delaware limited liability company. Mr. Edelman is a United States citizen. The Master Fund is a Cayman Islands corporation.

Schedule A to this Amendment No. 6 to Schedule 13D sets forth the information regarding the directors of the Master Fund.

Items 5 of the Schedule 13D is amended and supplemented as follows:

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: August 14, 2024

Schedule A

The following sets forth the name, address, principal occupation, citizenship and beneficial ownership of Ordinary Shares (to the extent not pursuant to Item 5(a)) of each director of the Master Fund (to the extent not set forth in Item 2).