Shay Capital discloses 6.7% stake in Repare

Repare Therapeutics Inc. (RPTX) received a Schedule 13G reporting that Shay Capital LLC and Shay Capital Holdings LLC, both Delaware entities, beneficially own 2,870,141 common shares of the company, representing 6.7% of the outstanding common shares.

Rhea-AI Filing Summary

Repare Therapeutics Inc. (RPTX) received a Schedule 13G reporting that Shay Capital LLC and Shay Capital Holdings LLC, both Delaware entities, beneficially own 2,870,141 common shares of the company, representing 6.7% of the outstanding common shares. The filing states that each filer has sole voting and sole dispositive power over these shares, with no shared voting or dispositive power. The reporting persons certify that the securities were not acquired and are not held for the purpose of changing or influencing control of Repare Therapeutics, indicating a passive investment position.

FAQ

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

What stake in Repare Therapeutics Inc. (RPTX) does Shay Capital report on this Schedule 13G?

The Schedule 13G reports that Shay Capital LLC and Shay Capital Holdings LLC beneficially own 2,870,141 common shares of Repare Therapeutics Inc., representing 6.7% of the company’s common shares.

Who are the reporting persons on the Repare Therapeutics (RPTX) Schedule 13G?

The reporting persons are Shay Capital LLC and Shay Capital Holdings LLC, each referred to as a Filer, with a principal business address at 280 Park Avenue, 5th Floor West, New York, NY 10017.

Does Shay Capital have voting and dispositive power over its Repare Therapeutics (RPTX) shares?

Yes. Each filer reports sole voting power over 2,870,141 shares and sole dispositive power over the same number of shares, with no shared voting or shared dispositive power.

Is Shay Capital’s 6.7% position in Repare Therapeutics (RPTX) filed as a passive investment?

Yes. The certification states the securities were not acquired and are not held for the purpose or effect of changing or influencing control of Repare Therapeutics, consistent with a passive investment stance.

What class of Repare Therapeutics (RPTX) securities is covered by this Schedule 13G?

The filing covers common shares, no par value of Repare Therapeutics Inc., identified by CUSIP 760273102.

What is the reported date of event for Shay Capital’s Repare Therapeutics (RPTX) holdings?

The Schedule 13G lists 01/20/2026 as the Date of Event Which Requires Filing for the reported beneficial ownership.

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Accepted by SEC EDGAR 01/27/2026 - 04:00 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Repare Therapeutics Inc.

(Name of Issuer)

Common shares, no par value

(Title of Class of Securities)

760273102

(CUSIP Number)

01/20/2026

(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)

SCHEDULE 13G

CUSIP No. 760273102

1

Names of Reporting Persons

Shay Capital LLC

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 2,870,141.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,870,141.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,870,141.00

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)

6.7 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP No. 760273102

1

Names of Reporting Persons

Shay Capital Holdings LLC

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 2,870,141.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,870,141.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,870,141.00

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)

6.7 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Repare Therapeutics Inc.
(b)	Address of issuer's principal executive offices: 7171 Frederick-Banting, Building 2, Suite 270, St-Laurent, QUEBEC, CANADA, H4S 1Z9.
Item 2.
(a)	Name of person filing: Shay Capital LLC Shay Capital Holdings LLC Each a "Filer".
(b)	Address or principal business office or, if none, residence: The principal business address of each Filer is 280 Park Avenue, 5th Floor West, New York, NY 10017.
(c)	Citizenship: Shay Capital LLC and Shay Capital Holdings LLC - Delaware
(d)	Title of class of securities: Common shares, no par value
(e)	CUSIP No.: 760273102
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: See Item 9 of the cover page for each Filer.
(b)	Percent of class: See Item 11 of the cover page for each Filer.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See Item 5 of the cover page for each Filer.
	(ii) Shared power to vote or to direct the vote: See Item 6 of the cover page for each Filer.
	(iii) Sole power to dispose or to direct the disposition of: See Item 7 of the cover page for each Filer.
	(iv) Shared power to dispose or to direct the disposition of: See Item 8 of the cover page for each Filer.
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.
	Not Applicable
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.

Shay Capital LLC

Signature:	Elan Foxman
Name/Title:	Chief Financial Officer
Date:	01/27/2026

Shay Capital Holdings LLC

Signature:	Elan Foxman
Name/Title:	Chief Financial Officer
Date:	01/27/2026

Exhibit Information

Exhibit 1: Joint Filing Agreement