David J. Chang

CIK: 0001790552

Transaction Breakdown

Open Market Buys (P)1 (5.9%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)9 (52.9%)

Compensation grants

Other (G, F, J, C, D, …)7 (41.2%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

CABA

Cabaletta Bio, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (17 total)

CABA
Cabaletta Bio, Inc.
Mar 2, 2026
Award(A)
Stock Option (Right to Buy)
Direct
225K shares-
CABA
Cabaletta Bio, Inc.
Jan 21, 2026
Purchase(P)
Direct
8.8K shares at avg. $2.26$20K
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
185.7K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
48.8K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
48.8K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
38.2K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
38.2K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
113.5K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
113.5K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
135K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
135K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
150K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
150K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
130K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
130K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
185.7K shares-
CABA
Cabaletta Bio, Inc.
Mar 3, 2025
Award(A)
Stock Option (Right to Buy)
Direct
145K shares-

		Type	Shares	Price		Ownership
Mar 2, 2026	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	225,000	-	-	Direct
Jan 21, 2026	CABA Cabaletta Bio, Inc.	Purchase(P)	8,800	$2.26	$19,888	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	185,709	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	48,836	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	48,836	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	38,238	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	38,238	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	113,500	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	113,500	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	135,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	135,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	150,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	150,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	130,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	130,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	185,709	-	-	Direct
Mar 3, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	145,000	-	-	Direct

1-17 of 17 transactions

About Chang David J.

Chang David J. (SEC CIK 0001790552) files insider reports with the SEC as Chief Medical Officer of Cabaletta Bio, Inc. (CABA).

Signal8 holds 4 ownership filings by Chang David J., all Form 4s, filed between Mar 4, 2025 and Mar 2, 2026. Those filings report 17 transactions, from Mar 3, 2025 to Mar 2, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Chang David J.'s filings is in PHILADELPHIA, PA.

Recent filings by Chang David J.

Mar 2, 2026: Grant or award of CABA derivative securities (Form 4, code A).
Jan 21, 2026: Open-market purchase of CABA shares (Form 4, code P).
May 19, 2025: Disposition to issuer transactions of CABA derivative securities (2 lines, Form 4, code D).
May 19, 2025: Grant or award of CABA derivative securities (Form 4, code A).
May 19, 2025: Disposition to issuer transaction of CABA derivative securities (Form 4, code D).

Other insiders filing for Cabaletta Bio, Inc. (CABA)

Tomasello Shawn, Director
Simon Mark, Director
HENRIQUES RICHARD C JR, Director
Bollard Catherine, Director
Brun Scott C., Director
Das Arun, Chief Business Officer

How to read Form 4 transaction codes