DEFA14A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

Check the appropriate box:


☐		Preliminary Proxy Statement

☐		Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐		Definitive Proxy Statement

☒		Definitive Additional Materials

☐		Soliciting Material Pursuant to §240.14a-12

CABALETTA BIO, INC.

(Name of registrant as specified in its charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):



☒	No fee required.

☐	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

	(1)	Title of each class of securities to which transaction applies:
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☐	Fee paid previously with preliminary materials.

☐	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

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		TABULATOR, P.O. BOX 8016, CARY, NC 27512-9903				Important Notice Regarding the Availability of Proxy Materials for Cabaletta Bio, Inc. Stockholders Meeting to be held on June 01, 2021 For Stockholders as of April 09, 2021 This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. This is not a ballot. You cannot use this notice to vote your shares. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy materials go to: www.proxydocs.com/CABA To vote your proxy while visiting this site, you will need the 12 digit control number in the box below. Under United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper form. Proxy materials can be distributed by making them available on the internet. CONTROL NUMBER

LOGO

For a convenient way to view proxy materials

and VOTE go to www.proxydocs.com/CABA

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Have the 12 digit control number located in the shaded box above available

when you access the website and follow the instructions.

If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year’s s tockholder meeting, you must make this request on or before May 21, 2021.

To order paper materials, use one of the following methods.

LOGO

INTERNET

www.investorelections.com/CABA

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TELEPHONE

(866) 648-8133

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*E-MAIL

paper@investorelections.com

When requesting via the internet or telephone you will need the 12 digit control number located in the shaded box above.

* If requesting material by e-mail, please send a blank e-mail with the 12 digit control number (located above) in the subject line. No other requests, instructions or other inquiries should be included with your e-mail requesting material.

Cabaletta Bio, Inc.

Meeting Information

Meeting Materials: Notice of Meeting and Proxy Statement & Annual Report on Form 10-K

Meeting Type: Annual Meeting of Stockholders

Date: Tuesday, June 01, 2021

Time: 09:00 AM, Eastern Time

Place: Annual Meeting to be held live via the Internet -

please visit www.proxydocs.com/CABA for more details.

You must pre-register to attend the meeting online at www.proxydocs.com/CABA

SEE REVERSE FOR FULL AGENDA

Cabaletta Bio, Inc.

Annual Meeting of Stockholders

The Board of Directors Recommends a Vote FOR the director nominees listed in proposal 1 and FOR proposal 2.

PROPOSAL

1.	To elect two class II directors to serve until the 2024 annual meeting of our stockholders.

1.01

Catherine Bollard, MBChB, M.D.

1.02

Richard Henriques, MBA

2.	To ratify the appointment of Ernst & Young as our independent registered public accounting firm for the fiscal year ending December 31, 2021.

NOTE: The Board of Directors will consider and act upon any other business properly brought before the Annual Meeting or any adjournment or postponement thereof.