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Filing Details

Accession Number:: 0001104659-20-135319
Form Type:: 13D Filing
Publication Date:: 2020-12-14 17:13:15

Filed By:: 5am Ventures V, L.p.
Company:: Cabaletta Bio Inc. (NASDAQ:CABA)
Filing Date:: 2020-12-14
SEC Url:: 13D Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name	Shared Voting Power	Shared Dispositive Power	Aggregate Amount Owned Power	Percent of Class
5AM Ventures V	2,953,634	2,953,634	2,953,634	15.2%
5AM Partners V	2,953,634	2,953,634	2,953,634	15.2%
5AM Opportunities I	417,629	417,629	417,629	2.2%
5AM Opportunities I (GP)	417,629	417,629	417,629	2.2%
Dr. Kush Parmar	3,371,263	3,371,263	3,371,263	17.4%
Andrew J. Schwab	3,371,263	3,371,263	3,371,263	17.4%
Dr. Scott M. Rocklage	2,953,634	2,953,634	2,953,634	15.2%

Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO RULE 13d-l(a) AND AMENDMENTS THERETO FILED PURSUANT

TO RULE 13d-2(a)

(Amendment No. 1)*

Cabaletta Bio, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

12674W109

(CUSIP Number)

Rebecca Lucia

5AM Venture Management, LLC

501 2nd Street, Suite 350

San Francisco, CA 94107

(415) 993-8565

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

December 10, 2020

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ¨

* The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons 5AM Ventures V, L.P.
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) WC
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 2,953,634 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 2,953,634 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 2,953,634 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 15.2% of Common Stock; 12.3% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) PN

(1) This Schedule 13D is filed by 5AM Partners V, LLC (5AM Partners V), 5AM Ventures V, L.P. (5AM V), 5AM Opportunities I, L.P. (5AM Opportunities), 5AM Opportunities I (GP), LLC (5AM Opportunities GP), Andrew J. Schwab (Schwab), Dr. Kush Parmar (Dr. Parmar) and Dr. Scott M. Rocklage (Dr. Rocklage and, with 5AM Partners V, 5AM V, 5AM Opportunities, 5AM Opportunities GP, Schwab, Dr. Parmar and Dr. Rocklage, collectively, the Reporting Persons). The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) These shares are held by 5AM V. Schwab, Dr. Parmar and Dr. Rocklage, as managing members of 5AM Partners V, share voting and investment authority over the shares held by 5AM V.

(3) Based on 19,379,852 shares of voting common stock (Common Stock) and 4,675,615 shares of non-voting common stock (Non-Voting Common Stock and, together with the Common Stock, the Combined Common Stock) outstanding as of September 30, 2020 as set forth in the Issuers Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, filed with the SEC on November 10, 2020.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons 5AM Partners V, LLC
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) AF
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 2,953,634 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 2,953,634 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 2,953,634 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 15.2% of Common Stock; 12.3% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) OO

(1) This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) These shares are held by 5AM V. Schwab, Dr. Parmar and Dr. Rocklage, as managing members of 5AM Partners V, share voting and investment authority over the shares held by 5AM V.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons 5AM Opportunities I, L.P.
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) WC
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 417,629 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 417,629 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 417,629 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 2.2% of Common Stock; 1.7% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) PN

(1) This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) These shares are held by 5AM Opportunities. Schwab and Dr. Parmar, as managing members of 5AM Opportunities GP, share voting and investment authority over the shares held by 5AM Opportunities.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons 5AM Opportunities I (GP), LLC
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) AF
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 417,629 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 417,629 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 417,629 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 2.2% of Common Stock; 1.7% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) OO

(1) This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) Includes 417,629 shares held by 5AM Opportunities. Schwab and Dr. Parmar, as managing members of 5AM Opportunities GP, share voting and investment authority over the shares held by 5AM Opportunities.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons Dr. Kush Parmar
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) AF
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 3,371,263 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 3,371,263 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 3,371,263 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 17.4% of Common Stock; 14.0% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) IN

(1) This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) Includes (i) 2,953,634 shares held by 5AM V; and (ii) 417,629 shares held by 5AM Opportunities. Dr. Rocklage, Schwab and Dr. Parmar, as managing members of 5AM Partners V, share voting and investment authority over the shares held by 5AM V. Schwab and Dr. Parmar, as managing members of 5AM Opportunities GP, share voting and investment authority over the shares held by 5AM Opportunities.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons Andrew J. Schwab
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) AF
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 3,371,263 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 3,371,263 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 3,371,263 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 17.4% of Common Stock; 14.0% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) IN

(1) This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) Includes (i) 2,953,634 shares held by 5AM V; and (ii) 417,629 shares held by 5AM Opportunities. Schwab, Dr. Rocklage and Dr. Parmar, as managing members of 5AM Partners V, share voting and investment authority over the shares held by 5AM V. Schwab and Dr. Parmar, as managing members of 5AM Opportunities GP, share voting and investment authority over the shares held by 5AM Opportunities.

CUSIP No. 12674W109

13D

1.	Name of Reporting Persons Dr. Scott M. Rocklage
2.	Check the Appropriate Box if a Member of a Group (see instructions)
	(a)			o
	(b)			x(1)
3.	SEC USE ONLY
4.	Source of Funds (see instructions) AF
5.	Check if Disclosure of Legal Proceedings Is Required Pursuant to Item 2(d) or 2(e)			o
6.	Citizenship or Place of Organization United States
Number of Shares Beneficially Owned by Each Reporting Person With		7.	Sole Voting Power 0
		8.	Shared Voting Power 2,953,634 shares of Common Stock (2)
		9.	Sole Dispositive Power 0
		10.	Shared Dispositive Power 2,953,634 shares of Common Stock (2)
11.	Aggregate Amount Beneficially Owned by Each Reporting Person 2,953,634 shares of Common Stock (2)
12.	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (see instructions)			o
13.	Percent of Class Represented by Amount in Row 11 15.2% of Common Stock; 12.3% of Combined Common Stock (3)
14.	Type of Reporting Person (see instructions) IN

(1) This Schedule 13D is filed by the Reporting Persons. The Reporting Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2) The shares held by 5AM V. Dr. Parmar, Schwab and Dr. Rocklage, as managing members of 5AM Partners V, share voting and investment authority over the shares held by 5AM V.

CUSIP No. 12674W109

13D

Explanatory Note: This Amendment No. 1 (the Amendment), which amends the Schedule 13D filed with the Securities and Exchange Commission (the SEC) on November 12, 2019 (the Original Schedule 13D) is being filed on behalf of 5AM Partners V, LLC (5AM Partners V), 5AM Ventures V, L.P. (5AM V), 5AM Opportunities I, L.P. (5AM Opportunities), 5AM Opportunities I (GP), LLC (5AM Opportunities GP), Andrew J. Schwab (Schwab), Dr. Kush Parmar (Dr. Parmar) and Dr. Scott M. Rocklage (Dr. Rocklage and, with 5AM Partners V, 5AM V, 5AM Opportunities, 5AM Opportunities GP, Schwab, Dr. Parmar and Dr. Rocklage, collectively, the Reporting Persons) in respect of the Voting Common Stock, $0.0001 par value per share (Common Stock), of Cabaletta Bio, Inc., a Delaware corporation (the Issuer) This Amendment is being filed by the Reporting Persons to report open market sales of Common Stock on December 10, 2020. Accordingly, the number of securities beneficially owned by the Reporting Persons has decreased as described in Items 4 and 5 below.

Items 4 and 5 of the Original Schedule 13D are hereby amended and supplemented to the extent hereinafter expressly set forth and, except as amended and supplemented hereby, the Original Schedule 13D remains in full force and effect. All capitalized terms used in this Amendment but not defined herein shall have the meanings ascribed thereto in the Original Schedule 13D.

Item 4. Purpose of Transaction

Item 4 of the Original Schedule 13D is hereby amended and supplemented by adding the following paragraph at the end of Item 4:

On December 10, 2020, 5AM Ventures V, L.P. sold 261,084 shares of Common Stock and 5AM Opportunities I, L.P. sold 36,916 shares of Common Stock, each in open market transactions for $14.75 per share.

CUSIP No. 12674W109

13D

Item 5. Interest in Securities of the Issuer

Item 5 of the Original Schedule 13D is hereby amended and restated in its entirety as follows:

(a) (b). The following information with respect to the ownership of the Common Stock of the Issuer by the persons filing this statement on Schedule 13D is provided as of December 14, 2020:

Reporting Persons	Shares Held Directly	Sole Voting Power	Shared Voting Power(1)	Sole Dispositive Power	Shared Dispositive Power (1)	Beneficial Ownership	Percentage of Class (3)		Percentage of Combined Common Stock (4)
5AM V	2,953,634	0	2,953,634	0	2,953,634	2,953,634	15.2	%	12.3	%
5AM Partners V (1)	0	0	2,953,634	0	2,953,634	2,953,634	15.2	%	12.3	%
5AM Opportunities	417,629	0	417,629	0	417,629	417,629	2.2	%	1.7	%
5AM Opportunities GP (2)	0	0	417,629	0	417,629	417,629	2.2	%	1.7	%
Dr. Parmar (1)(2)	0	0	3,371,263	0	3,371,263	3,371,263	17.4	%	14.0	%
Schwab (1) (2)	0	0	3,371,263	0	3,371,263	3,371,263	17.4	%	14.0	%
Dr. Rocklage (1)	0	0	2,953,634	0	2,953,634	2,953,634	15.2	%	12.3	%

(1) Includes 2,953,634 shares of Common Stock held by 5AM V. Dr. Parmar, Schwab and Dr. Rocklage, as managing members of 5AM Partners V, share voting and investment authority over the shares held by 5AM V.

(2) Includes 417,629 shares of Common Stock held by 5AM Opportunities. Schwab and Dr. Parmar, as managing members of 5AM Opportunities GP, share voting and investment authority over the shares held by 5AM Opportunities.

(3) Based on 19,379,852 shares of voting Common Stock outstanding as of September 30, 2020 as set forth in the Issuers Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, filed with the SEC on November 10, 2020.

(4) Based on 4,675,615 shares of non-voting common stock (the Non-Voting Common Stock, together with the Common Stock, the Combined Common Stock) outstanding as of September 30, 2020 as set forth in the Issuers Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, filed with the SEC on November 10, 2020.

(c) Except as set forth herein, none of the Reporting Persons has effected any transactions in shares of the Issuers Common Stock during the last 60 days.

(d) No other person is known to have the right to receive or the power to direct the receipt of dividends from, or any proceeds from the sale of, the shares of Common Stock beneficially owned by any of the Reporting Persons.

(e) Not applicable.

CUSIP No. 12674W109

13D

SIGNATURES

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.

Date: December 14, 2020

5AM VENTURES V, L.P.

By:	5AM Partners V, LLC,
	its General Partner

By:	/s/ Dr. Scott M. Rocklage
	Dr. Scott M. Rocklage
	Managing Member


5AM PARTNERS V, LLC


By:	/s/ Dr. Scott M. Rocklage
	Dr. Scott M. Rocklage
	Managing Member


5AM OPPORTUNITIES I, L.P.

By:	5AM Opportunities I (GP), LLC,
	its General Partner


By:	/s/ Dr. Kush Parmar
	Dr. Kush Parmar
	Managing Member


5AM OPPORTUNITIES I (GP), LLC


By:	/s/ Dr. Kush Parmar
	Dr. Kush Parmar
	Managing Member

/s/ Dr. Kush Parmar
Dr. Kush Parmar

/s/ Dr. Scott Rocklage
Dr. Scott Rocklage

/s/ Andrew J. Schwab
Andrew J. Schwab