Millennium reports 1.3% stake in Cabaletta Bio

Cabaletta Bio, Inc. is reported as having a significant shareholder group led by Millennium Management LLC, Millennium Group Management LLC, and Israel A. Englander.

Rhea-AI Filing Summary

Cabaletta Bio, Inc. is reported as having a significant shareholder group led by Millennium Management LLC, Millennium Group Management LLC, and Israel A. Englander. These reporting persons collectively report beneficial ownership of 2,068,491 shares of Cabaletta Bio common stock, representing 1.3% of the class.

The filing states that the reporting persons have no sole voting or dispositive power over these shares, but hold shared voting and shared dispositive power over 2,068,491 shares. The securities are held through entities over which Millennium Management LLC and related managers exercise voting control and investment discretion, and the reporting persons state that this disclosure should not be construed as an admission of beneficial ownership. They also indicate that they now hold 5 percent or less of Cabaletta Bio’s common stock.

Key Figures

Shares beneficially owned: 2,068,491 shares Percent of class owned: 1.3% Shared voting power: 2,068,491 shares +3 more

6 metrics

Shares beneficially owned 2,068,491 shares Cabaletta Bio common stock reported by Millennium entities and Israel A. Englander

Percent of class owned 1.3% Percentage of Cabaletta Bio common stock corresponding to reported beneficial ownership

Shared voting power 2,068,491 shares Shares of Cabaletta Bio over which the reporting persons have shared voting power

Sole voting power 0 shares Cabaletta Bio shares over which the reporting persons have sole voting authority

Shared dispositive power 2,068,491 shares Cabaletta Bio shares over which the reporting persons have shared dispositive power

Sole dispositive power 0 shares Cabaletta Bio shares over which the reporting persons have sole dispositive power

Key Terms

beneficial ownership, shared voting power, shared dispositive power, Schedule 13G/A, +1 more

5 terms

beneficial ownership financial

"The securities disclosed herein as potentially beneficially owned by Millennium Management LLC..."

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

shared voting power financial

"6 | Shared Voting Power 2,068,491.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"8 | Shared Dispositive Power 2,068,491.00"

Schedule 13G/A regulatory

"form_type": "SCHEDULE 13G/A""

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.

percent of class financial

"(b) | Percent of class: See response to Item 11 on each cover page."

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

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

What ownership stake in CABA does Millennium Management report in this Schedule 13G/A?

Millennium Management and related reporting persons report beneficial ownership of 2,068,491 shares of Cabaletta Bio common stock, representing 1.3% of the outstanding class, with shared voting and dispositive power over all of these shares.

Who are the reporting persons in Cabaletta Bio (CABA)’s Schedule 13G/A?

The reporting persons are Millennium Management LLC, Millennium Group Management LLC, and Israel A. Englander. They report shared voting and dispositive power over 2,068,491 Cabaletta Bio common shares through entities they control or manage.

What percentage of Cabaletta Bio (CABA) common stock is reported as owned?

The filing reports beneficial ownership of 1.3% of Cabaletta Bio’s common stock, corresponding to 2,068,491 shares. The reporting persons also state they are the owners of 5 percent or less of the class.

Do the reporting persons have sole or shared voting power over CABA shares?

The reporting persons disclose 0 shares with sole voting power and 2,068,491 shares with shared voting power. They likewise have 0 shares with sole dispositive power and 2,068,491 shares with shared dispositive power over Cabaletta Bio stock.

How do Millennium entities describe their beneficial ownership of Cabaletta Bio (CABA)?

They state the Cabaletta Bio shares are held by entities under their voting control and investment discretion, but that this should not be construed as an admission of beneficial ownership by Millennium Management LLC, Millennium Group Management LLC, or Israel A. Englander.

What type of security in CABA is covered by this Schedule 13G/A?

The filing covers Cabaletta Bio’s common stock with a par value of $0.00001 per share, identified by CUSIP 12674W109, and reports the extent of beneficial ownership and voting/dispositive powers over these shares.

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

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Available on EDGAR 07/23/2026 - 05:28 PM Accepted by SEC EDGAR 07/23/2026 - 05:27 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Cabaletta Bio, Inc.

(Name of Issuer)

Common Stock, par value $0.00001 per share

(Title of Class of Securities)

12674W109

(CUSIP Number)

06/30/2026

(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

Millennium Management 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 0.00
6	Shared Voting Power 2,068,491.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,068,491.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,068,491.00

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)

1.3 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 12674W109

1

Names of Reporting Persons

Millennium Group Management 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 0.00
6	Shared Voting Power 2,068,491.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,068,491.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,068,491.00

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)

1.3 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 12674W109

1

Names of Reporting Persons

Israel A. Englander

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 2,068,491.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,068,491.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,068,491.00

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)

1.3 %

12

Type of Reporting Person (See Instructions)

IN

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, Pennsylvania 19104
Item 2.
(a)	Name of person filing: Millennium Management LLC Millennium Group Management LLC Israel A. Englander
(b)	Address or principal business office or, if none, residence: Millennium Management LLC 399 Park Avenue New York, New York 10022 Millennium Group Management LLC 399 Park Avenue New York, New York 10022 Israel A. Englander c/o Millennium Management LLC 399 Park Avenue New York, New York 10022
(c)	Citizenship: Millennium Management LLC - Delaware Millennium Group Management LLC - Delaware Israel A. Englander - United States
(d)	Title of class of securities: Common Stock, par value $0.00001 per share
(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: See response to Item 9 on each cover page.
(b)	Percent of class: See response to Item 11 on each cover page.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See response to Item 5 on each cover page.
	(ii) Shared power to vote or to direct the vote: See response to Item 6 on each cover page.
	(iii) Sole power to dispose or to direct the disposition of: See response to Item 7 on each cover page.
	(iv) Shared power to dispose or to direct the disposition of: See response to Item 8 on each cover page. The securities disclosed herein as potentially beneficially owned by Millennium Management LLC, Millennium Group Management LLC and Mr. Englander are held by entities subject to voting control and investment discretion by Millennium Management LLC and/or other investment managers that may be controlled by Millennium Group Management LLC (the managing member of Millennium Management LLC) and Mr. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). The foregoing should not be construed in and of itself as an admission by Millennium Management LLC, Millennium Group Management LLC or Mr. Englander as to beneficial ownership of the securities held by such entities.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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.

Millennium Management LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	07/22/2026

Millennium Group Management LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	07/22/2026

Israel A. Englander

Signature:	/s/ Israel A. Englander
Name/Title:	Israel A. Englander
Date:	07/22/2026

Exhibit Information

Exhibit I: Joint Filing Agreement, dated as of July 22, 2026, by and among Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander.