Group One Trading LLC holds 5.94M shares in Quince (QNCX) filing

Rhea-AI Filing Summary

Group One Trading LLC reports beneficial ownership of 5,942,906 shares of Quince Therapeutics common stock as of 02/28/2026. This holding is reported as 10.67% of the class and is shown with sole voting and dispositive power over those 5,942,906 shares. The filing states the reported total includes options to buy 6,344,500 shares and notes the filer acts as a market maker in Quince options.

Insights

Ownership & Market-Maker Analyst

Group One Trading LLC holds 5.94M shares (10.67%) and reports options exposure.

Group One Trading LLC is reported as beneficial owner of 5,942,906 shares as of 02/28/2026 with sole voting and dispositive power. The filing also discloses options to buy 6,344,500 shares, reflecting derivative positions tied to the issuer.

Because the filer identifies itself as a market maker, the positions likely reflect trading and hedging activities; cash‑flow treatment and intended disposition are not stated in the excerpt.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Quince Therapeutics, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 par value

(Title of Class of Securities)

02/28/2026

(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 Number(s):

1

Names of Reporting Persons

GROUP ONE TRADING 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 5,942,906.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,942,906.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,942,906.00

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)

10.7 %

12

Type of Reporting Person (See Instructions)

BD

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Quince Therapeutics, Inc.
(b)	Address of issuer's principal executive offices: 611 GATEWAY BLVD., SUITE 273, SOUTH SAN FRANCISCO, CALIFORNIA, 94080
Item 2.
(a)	Name of person filing: GROUP ONE TRADING LLC
(b)	Address or principal business office or, if none, residence: 425 S. FINANCIAL PLACE, SUITE 3400 CHICAGO, IL 60605
(c)	Citizenship: DELAWARE, USA
(d)	Title of class of securities: Common Stock, par value $0.0001 par value
(e)	CUSIP No.: 22053A107
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: As of February 28, 2026, Group One Trading LLC may be deemed to be the beneficial owner of 5,942,906 Shares. The number of Shares reported as beneficially owned includes options to buy 6,344,500 Shares. Group One Trading LLC is a market maker in the options listed on Quince Therapeutics, Inc. Group One Trading LLC may be both long and short calls and puts that have an expiration date within 60 days and beyond 60 days.
(b)	Percent of class: 10.67%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 5,942,906
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 5,942,906
	(iv) Shared power to dispose or to direct the disposition of: 0
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 acquired and are held in the ordinary course of business and 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.

GROUP ONE TRADING LLC

Signature:	Kyle Tondo-Kramer
Name/Title:	Chief Compliance Officer
Date:	03/05/2026

FAQ

What stake does Group One Trading LLC report in QNCX?

Group One Trading LLC reports beneficial ownership of 5,942,906 shares of Quince common stock as of 02/28/2026. The filing states this equals 10.67% of the class and includes options to buy additional shares.

Do the reported holdings include options or derivatives for QNCX?

Yes. The filing states the reported holdings include options to buy 6,344,500 shares. It also notes the filer is a market maker and may hold long and short calls and puts with varying expirations.

What voting and disposition powers are reported by Group One Trading LLC?

The filing reports sole voting power and sole dispositive power over 5,942,906 shares. No shared voting or disposition powers are disclosed in the excerpt.

What is the as-of date for the ownership numbers in the QNCX filing?

The ownership numbers are reported as of 02/28/2026. The signature block shows the filing was signed on 03/05/2026, indicating the reporting cutoff and signature dates.

Does the filing explain why Group One Trading LLC holds these shares?

The filing identifies Group One Trading LLC as a market maker in Quince options, implying trading activity. The excerpt does not state intent, planned dispositions, or cash‑flow treatment for the listed positions.