Cabaletta Bio, Inc. Annual report pursuant to Section 13 and 15(d)

Convertible Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2020

	Series A Preferred						Series A-1 Preferred						Series A-2 Preferred						Series B Preferred						Total Convertible Preferred Stock
	Shares			Amount			Shares			Amount			Shares			Amount			Shares			Amount			Shares			Amount
Balance—December 31, 2018		3,146,551			12,575			7,372,719			24,994			1,873,777			6,352			—			—			12,393,047			43,921
Issuance		—			—			—			—			—			—			6,963,788			50,000			6,963,788			50,000
Exchange, including deemed dividend		—			—			—			—			(1,405,332	)		(4,764	)		1,405,332			10,090			—			5,326
Issuance costs		—			—			—			—			—			—			—			(1,293	)		—			(1,293	)
Conversion to common stock		(3,146,551	)		(12,575	)		(7,372,719	)		(24,994	)		(468,445	)		(1,588	)		(8,369,120	)		(58,797	)		(19,356,835	)		(97,954	)
Balance—December 31, 2019		—		$	—			—		$	—			—		$	—			—		$	—			—		$	—