T. Rowe Price discloses 10.2% Cabaletta Bio (CABA) ownership stake

Rhea-AI Filing Summary

Cabaletta Bio received an amended Schedule 13G showing that T. Rowe Price Investment Management, Inc. beneficially owns 9,858,257 shares of its common stock, representing 10.2% of the class. The firm reports sole voting power over 9,804,684 shares and sole dispositive power over 9,858,257 shares.

The filing notes that these securities are held in the ordinary course of business and not for the purpose of changing or influencing control of Cabaletta Bio. T. Rowe Price Small-Cap Value Fund holds 5,169,039 shares, representing 5.4% of the common stock class reported.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

CABALETTA BIO INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

12674W109

(CUSIP Number)

12/31/2025

(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. 12674W109

1

Names of Reporting Persons

T. Rowe Price Investment Management, Inc.

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

MARYLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 9,804,684.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 9,858,257.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,858,257.00

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)

10.2 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CABALETTA BIO INC
(b)	Address of issuer's principal executive offices: 2929 ARCH STREET, SUITE 600, PHILADELPHIA, PA, 19104
Item 2.
(a)	Name of person filing: T. Rowe Price Investment Management, Inc.
(b)	Address or principal business office or, if none, residence: 1307 Point Street, Baltimore, MD 21231
(c)	Citizenship: Maryland
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 12674W109
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: 9858257
(b)	Percent of class: 10.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 9804684
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 9858257
	(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.
	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. Ownership of More than Five Percent on Behalf of Another Person (1) Price Investment Management does not serve as custodian of the assets of any of its clients; accordingly, in each instance only the client or the client's custodian or trustee bank has the right to receive dividends paid with respect to, and proceeds from the sale of, such securities. The ultimate power to direct the receipt of dividends paid with respect to, and the proceeds from the sale of, such securities, is vested in the individual and institutional clients which Price Investment Management serves as investment adviser. Any and all discretionary authority which has been delegated to Price Investment Management may be revoked in whole or in part at any time. Except as may be indicated if this is a joint filing with one of the registered investment companies sponsored by Price Investment Management which it also serves as investment adviser ("T. Rowe Price Funds"), not more than 5% of the class of such securities is owned by any one client subject to the investment advice of Price Investment Management. (2) [T. ROWE PRICE SMALL-CAP VALUE FUND ]: T. ROWE PRICE SMALL-CAP VALUE FUND, of which T. Rowe Price Investment Management, Inc. is the investment adviser, holds the securities reported herein in their investment portfolio managed by T. Rowe Price Investment Management, Inc. and such funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities that they hold. T. ROWE PRICE SMALL-CAP VALUE FUND has an interest in 5,169,039 of the class reported herein representing 5.4% of the class.
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. T. Rowe Price Investment Management, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as an admission that Price Investment Management is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied.

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.

T. Rowe Price Investment Management, Inc.

Signature:	Ellen York
Name/Title:	Vice President
Date:	02/17/2026

FAQ

What ownership stake in CABA does T. Rowe Price report in this Schedule 13G/A?

T. Rowe Price Investment Management, Inc. reports beneficial ownership of 9,858,257 shares of Cabaletta Bio common stock, representing 10.2% of the outstanding class. The firm holds sole voting power over 9,804,684 shares and sole dispositive power over 9,858,257 shares.

How many CABA shares does T. Rowe Price Small-Cap Value Fund hold?

T. Rowe Price Small-Cap Value Fund holds 5,169,039 Cabaletta Bio shares, representing 5.4% of the common stock class reported. These securities are in its investment portfolio managed by T. Rowe Price Investment Management, which serves as the investment adviser to the fund.

Does T. Rowe Price seek to influence control of Cabaletta Bio (CABA)?

The filing states the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of Cabaletta Bio. It also notes they are not held in connection with any transaction having that control-related purpose or effect.

What voting and dispositive powers over CABA shares does T. Rowe Price report?

T. Rowe Price Investment Management reports sole voting power over 9,804,684 Cabaletta Bio shares and sole dispositive power over 9,858,257 shares. It reports no shared voting power and no shared dispositive power over any Cabaletta Bio common stock in this filing.

How is beneficial ownership of Cabaletta Bio (CABA) structured among T. Rowe Price clients?

The filing explains T. Rowe Price acts as investment adviser and does not serve as custodian. Clients or their custodians receive dividends and sale proceeds, and discretionary authority can be revoked. No single client, apart from the noted fund, owns more than five percent of the class.

What disclaimer does T. Rowe Price make about beneficial ownership of CABA shares?

T. Rowe Price Investment Management expressly denies beneficial ownership of the Cabaletta Bio securities referenced. It states that the filing should not be construed as an admission that it is the beneficial owner of these shares, despite reporting them for Schedule 13G purposes as investment adviser.