Mark Simon

CIK: 0001400717

Transaction Breakdown

Open Market Buys (P)1 (9.1%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)6 (54.5%)

Compensation grants

Other (G, F, J, C, D, …)4 (36.4%)

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

Companies & Roles (1)

CABA

Cabaletta Bio, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (11 total)

CABA
Cabaletta Bio, Inc.
Jun 9, 2026
Award(A)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
Jan 21, 2026
Purchase(P)
Direct
11.1K shares at avg. $2.28$25K
CABA
Cabaletta Bio, Inc.
Jun 9, 2025
Award(A)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
22K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Disposition(D)
Stock Option (Right to Buy)
Direct
18.5K shares-
CABA
Cabaletta Bio, Inc.
May 19, 2025
Award(A)
Stock Option (Right to Buy)
Direct
18.5K shares-

		Type	Shares	Price		Ownership
Jun 9, 2026	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	22,000	-	-	Direct
Jan 21, 2026	CABA Cabaletta Bio, Inc.	Purchase(P)	11,061	$2.28	$25,261	Direct
Jun 9, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	22,000	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Disposition(D) Stock Option (Right to Buy)	18,460	-	-	Direct
May 19, 2025	CABA Cabaletta Bio, Inc.	Award(A) Stock Option (Right to Buy)	18,460	-	-	Direct

1-11 of 11 transactions

About Simon Mark

Simon Mark (SEC CIK 0001400717) files insider reports with the SEC as Director of Cabaletta Bio, Inc. (CABA).

Signal8 holds 4 ownership filings by Simon Mark, all Form 4s, filed between May 19, 2025 and Jun 10, 2026. Those filings report 11 transactions, from May 19, 2025 to Jun 9, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Simon Mark's filings is in PHILADELPHIA, PA.

Recent filings by Simon Mark

Jun 9, 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).
Jun 9, 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).
May 19, 2025: Grant or award of CABA derivative securities (Form 4, code A).

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

Tomasello Shawn, Director
HENRIQUES RICHARD C JR, Director
Bollard Catherine, Director
Brun Scott C., Director
Das Arun, Chief Business Officer
Gerard Michael, General Counsel

How to read Form 4 transaction codes