VIA EDGAR
October 22, 2019
United States Securities and Exchange Commission
Division of Corporation Finance
Mail Stop 4561
100 F Street, N.E.
Washington, D.C. 20549
Attention: Julia Griffith
Dietrich King
Acceleration Request for Registration Statement on FormS-1
FileNo. 333-234017
Dear Ms. Griffith and Mr. King,
Pursuant to Rule 461 under the Securities Act of 1933, as amended (the “Act”), Cabaletta Bio, Inc. (the “Company”) hereby requests that the effective date of the above-referenced registration statement (the “Registration Statement”) be accelerated to October 24, 2019, at 4:00 p.m., Eastern Time, or as soon thereafter as practicable, unless we or our outside counsel, Goodwin Procter LLP, request by telephone that such Registration Statement be declared effective at some other time. In making this acceleration request, the Company acknowledges that it is aware of its responsibilities under the Act.
Once the Registration Statement is effective, please orally confirm the event with our counsel, Goodwin Procter LLP by calling Barbara Bispham at (212)459-7252. We also respectfully request that a copy of the written order from the Securities and Exchange Commission (the “Commission”) verifying the effective time and date of the Registration Statement be sent to our counsel, Goodwin Procter LLP, Attention: Barbara Bispham, by facsimile to (646)219-7880.