Jennison Associates (NASDAQ: CABA) holds 24.27M shares, 11.4%

Rhea-AI Filing Summary

Jennison Associates LLC reports beneficial ownership of 24,267,980 shares (11.4%) of Cabaletta Bio Inc. The filing amends prior disclosures and shows Jennison holds 24,267,980 shares with sole voting power over those shares and shared dispositive power, filed with a reporting date of 05/29/2026 and signed 06/04/2026.

Insights

Institutional Ownership Analyst

Large passive stake reported: 24.27M shares, 11.4%.

Jennison Associates LLC is listed as beneficial owner of 24,267,980 shares of Cabaletta Bio, representing 11.4% of the class as disclosed in this amended Schedule 13G/A with a reporting date of 05/29/2026.

Filing type and the 13G/A form indicate an investment manager or passive investor posture rather than an active control intent; subsequent filings would show any change in intent or voting arrangements.

Corporate Governance Specialist

Voting and disposition profile shows sole voting power, shared dispositive power.

The filing states Jennison has sole voting power over 24,267,980 shares and shared dispositive power for the same number. This distinguishes vote control from shared disposal authority in the disclosed position.

Any governance implications depend on future actions; filings that change these powers or cross ownership thresholds would alter oversight considerations.

Key Figures

Beneficial ownership: 24,267,980 shares Percent of class: 11.4% Sole voting power: 24,267,980 shares +1 more

4 metrics

Beneficial ownership 24,267,980 shares reported as beneficially owned; reporting date <date>05/29/2026</date>

Percent of class 11.4% percent of common stock reported in the amendment

Sole voting power 24,267,980 shares sole power to vote as stated in Item 4

Shared dispositive power 24,267,980 shares shared power to dispose as stated in Item 4

Key Terms

Schedule 13G/A, beneficially owned, shared dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 4 ) CABALETTA BIO INC Common Stock"

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 regulatory

"Amount beneficially owned: 24267980"

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 regulatory

"Shared Dispositive Power 24,267,980.00"

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

CABALETTA BIO INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

12674W109

(CUSIP Number)

05/29/2026

(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): 12674W109

1

Names of Reporting Persons

Jennison Associates 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 24,267,980.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 24,267,980.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

24,267,980.00

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)

11.4 %

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: Jennison Associates LLC
(b)	Address or principal business office or, if none, residence: 55 East 52nd Street, New York, NY 10055
(c)	Citizenship: USA
(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: 24267980
(b)	Percent of class: 11.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 24267980
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 24267980
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.

Jennison Associates LLC

Signature:	Beata Markowicz
Name/Title:	Senior Vice President, Compliance
Date:	06/04/2026

FAQ

How many Cabaletta Bio (CABA) shares does Jennison Associates report owning?

Jennison Associates reports beneficial ownership of 24,267,980 shares of Cabaletta Bio, representing 11.4% of the common stock as stated in the amendment.

What voting and dispositive powers does Jennison report for CABA shares?

The filing shows Jennison has sole voting power over 24,267,980 shares and shared dispositive power over 24,267,980 shares, per the amended Schedule 13G/A.

What form was filed to report Jennison's ownership in Cabaletta Bio?

Ownership is reported on an amended Schedule 13G/A by Jennison Associates LLC, amending prior disclosures and dated with a reporting date of 05/29/2026.

When was the Jennison Schedule 13G/A for CABA signed?

The amendment is signed by Beata Markowicz, Senior Vice President, Compliance, with a signature date of 06/04/2026 on the filing.