Lynx1 Reports 15.2% Stake in GH Research

GH Research PLC ownership disclosure: Lynx1 Capital Management and Weston Nichols report beneficial ownership of 9,456,622 Ordinary Shares, representing 15.2% of the class.

Accepted by SEC EDGAR 05/15/2026 - 04:30 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

GH Research PLC ownership disclosure: Lynx1 Capital Management and Weston Nichols report beneficial ownership of 9,456,622 Ordinary Shares, representing 15.2% of the class. The percentage is calculated using 62,029,395 Ordinary Shares outstanding as of February 17, 2026.

The filing states the shares are directly held by the Lynx1 Master Fund LP and a managed account. Reported voting and dispositive authority is shared: Shared Voting Power 9,456,622 and Shared Dispositive Power 9,456,622. The statement is signed by Weston Nichols on behalf of Lynx1 and personally.

Insights

Institutional Ownership Analyst

Large passive stake disclosed by Lynx1: 15.2% of GH Research.

The filing documents that Lynx1 Master Fund LP and a managed account together hold 9,456,622 shares, with shared voting and dispositive powers recorded at the same figure. The ownership percentage uses an explicit outstanding count of 62,029,395 shares as of February 17, 2026.

This disclosure is a standard beneficial-ownership update under Schedule 13G/A. Subsequent filings could show changes if the fund or account trades; timing and cash‑flow treatment are not stated in the excerpt.

Corporate Governance Specialist

Shared control suggests institutional voting coordination, not sole control.

The cover rows list 0 sole voting and dispositive power and 9,456,622 shared voting and dispositive power, indicating the position is reported as shared authority. The filing includes the reporting persons' addresses and signatures for authentication.

Because the filing is a Schedule 13G/A, it updates beneficial ownership rather than announcing transactions; its governance implications depend on whether shared voting reflects an agreement among holders.

Key Figures

Shares beneficially owned: 9,456,622 shares Percent of class: 15.2% Shares outstanding: 62,029,395 shares +2 more

5 metrics

Shares beneficially owned 9,456,622 shares reported by Lynx1 Capital / Weston Nichols

Percent of class 15.2% based on 62,029,395 shares outstanding as of Feb 17, 2026

Shares outstanding 62,029,395 shares as of February 17, 2026 (used for percentage calculation)

Shared Voting Power 9,456,622 shares cover page disclosure of voting authority

Shared Dispositive Power 9,456,622 shares cover page disclosure of dispositive authority

Key Terms

Schedule 13G/A, Beneficially owned, Shared Dispositive Power

3 terms

Schedule 13G/A regulatory

"This statement is filed by: Lynx1 Capital Management LP and Mr. Weston Nichols"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficially owned financial

"Amount beneficially owned: The information required by Item 4(a) is set forth in Row 9"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Shared Dispositive Power financial

"Shared Dispositive Power 9,456,622.00"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Lynx1 report in GHRS?

Lynx1 reports owning 9,456,622 Ordinary Shares, equal to 15.2% of the class. The percentage is calculated using 62,029,395 shares outstanding as of February 17, 2026.

Who is named as the reporting person on the Schedule 13G/A for GHRS?

Lynx1 Capital Management LP is the investment manager filing on behalf of Lynx1 Master Fund LP and a managed account; Weston Nichols is disclosed as the sole member of the general partner and signed the filing.

What voting and dispositive powers are reported for the GHRS shares?

The filing reports 0 sole voting power and 9,456,622 shared voting power, and similarly 0 sole dispositive power and 9,456,622 shared dispositive power for the reported shares.

What outstanding share count does the filing use to calculate the percentage?

The percentage is based on an aggregate of 62,029,395 Ordinary Shares outstanding as of February 17, 2026, cited from the company’s Form 20‑F for the period ended December 31, 2025.

Does this Schedule 13G/A indicate who receives proceeds or dividends?

The filing states the Lynx1 Fund has the right to receive dividends or sale proceeds for the reported shares. No additional cash‑flow details or sale timing are provided in the excerpt.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

GH Research PLC

(Name of Issuer)

Ordinary Shares, nominal value $0.025 per share

(Title of Class of Securities)

G3855L106

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G3855L106

1

Names of Reporting Persons

Lynx1 Capital Management LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,456,622.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,456,622.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,456,622.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

15.2 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): G3855L106

1

Names of Reporting Persons

Weston Nichols

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,456,622.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,456,622.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,456,622.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

15.2 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: GH Research PLC
(b)	Address of issuer's principal executive offices: Joshua Dawson House Dawson Street Dublin 2 L2 D02 RY95 Ireland
Item 2.
(a)	Name of person filing: This statement is filed by: (i) Lynx1 Capital Management LP (the "Investment Manager"), a Delaware limited partnership, and the investment manager to Lynx1 Master Fund LP (the "Lynx1 Fund") and a managed account, with respect to the ordinary shares, nominal value $0.025 per share ("Ordinary Shares"), of GH Research PLC, an Irish public limited company (the "Company"), directly held by the Lynx1 Fund and the managed account; and (ii) Mr. Weston Nichols ("Mr. Nichols"), the sole member of Lynx1 Capital Management GP LLC, the general partner of the Investment Manager, with respect to the Ordinary Shares directly held by the Lynx1 Fund and the managed account. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons."" The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the securities reported herein.
(b)	Address or principal business office or, if none, residence: Lynx1 Capital Management LP D81 Calle C Suite 301, PMB 1202 Dorado, PR, 00646-2051 Weston Nichols c/o Lynx1 Capital Management LP D81 Calle C Suite 301, PMB 1202 Dorado, PR, 00646-2051
(c)	Citizenship: Investment Manager - Delaware Mr. Nichols - United States of America
(d)	Title of class of securities: Ordinary Shares, nominal value $0.025 per share
(e)	CUSIP No.: G3855L106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 62,029,395 Ordinary Shares outstanding as of February 17, 2026, as reported in the Company's Annual Report on Form 20-F for the period ended December 31, 2025, filed with the Securities and Exchange Commission on March 5, 2026.
(b)	Percent of class: 15.2%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. See Item 2(a). The Lynx1 Fund has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Ordinary Shares reported herein.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

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.

Lynx1 Capital Management LP

Signature:	/s/ Weston Nichols
Name/Title:	By: Lynx1 Capital Management GP LLC, General Partner, By: Weston Nichols, Sole Member
Date:	05/15/2026

Weston Nichols

Signature:	/s/ Weston Nichols
Name/Title:	Weston Nichols, Individually
Date:	05/15/2026