Matthew M. Walsh

CIK: 0001269428

Transaction Breakdown

Open Market Buys (P)1 (3.4%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)7 (24.1%)

Derivative conversions

Awards (A)11 (37.9%)

Compensation grants

Other (G, F, J, C, D, …)10 (34.5%)

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

Companies & Roles (2)

CERT

Certara, Inc.

Director

OGN

Organon & Co.

Officer

Discretionary Trading P&L

Holdings

Transaction History (29 total)

CERT
Certara, Inc.
May 14, 2026
Exercise(M)
Direct
15.8K shares-
CERT
Certara, Inc.
May 14, 2026
Award(A)
Restricted Stock Units
Direct
33.2K shares-
OGN
Organon & Co.
Mar 31, 2026
Award(A)
Restricted Stock Units
Direct
321.4K shares-
OGN
Organon & Co.
Mar 31, 2026
Exercise(M)
Direct
12K shares-
OGN
Organon & Co.
Mar 31, 2026
Tax Payment(F)
Direct
4.1K shares at avg. $5.70$24K
OGN
Organon & Co.
Mar 31, 2026
Exercise(M)
Direct
21.5K shares-
OGN
Organon & Co.
Mar 31, 2026
Tax Payment(F)
Direct
7.4K shares at avg. $5.70$42K
OGN
Organon & Co.
Mar 31, 2026
Award(A)
Restricted Stock Units
Direct
83.5K shares-
OGN
Organon & Co.
Feb 27, 2026
Award(A)
Direct
12K shares-
OGN
Organon & Co.
Feb 27, 2026
Tax Payment(F)
Direct
4.1K shares at avg. $7.23$30K
OGN
Organon & Co.
Feb 27, 2026
Tax Payment(F)
Direct
14.9K shares at avg. $7.17$107K
OGN
Organon & Co.
Feb 27, 2026
Award(A)
Direct
42.6K shares-
CERT
Certara, Inc.
May 21, 2025
Exercise(M)
Direct
11.9K shares-
CERT
Certara, Inc.
May 21, 2025
Award(A)
Restricted Stock Units
Direct
15.8K shares-
OGN
Organon & Co.
May 5, 2025
Purchase(P)
Direct
11.4K shares at avg. $8.82$101K
OGN
Organon & Co.
Mar 31, 2025
Tax Payment(F)
Direct
5.9K shares at avg. $14.51$86K
OGN
Organon & Co.
Mar 31, 2025
Exercise(M)
Direct
7.8K shares-
OGN
Organon & Co.
Mar 31, 2025
Tax Payment(F)
Direct
3.8K shares at avg. $14.51$55K
OGN
Organon & Co.
Mar 31, 2025
Exercise(M)
Direct
12K shares-
OGN
Organon & Co.
Mar 31, 2025
Tax Payment(F)
Direct
7.4K shares at avg. $14.51$108K
OGN
Organon & Co.
Mar 31, 2025
Exercise(M)
Direct
15.1K shares-
OGN
Organon & Co.
Mar 31, 2025
Award(A)
Stock Option (right to buy)
Direct
317.7K shares-
OGN
Organon & Co.
Mar 31, 2025
Award(A)
Restricted Stock Units
Direct
64.6K shares-
OGN
Organon & Co.
Feb 20, 2025
Award(A)
Direct
30.4K shares-
OGN
Organon & Co.
Feb 20, 2025
Tax Payment(F)
Direct
10.7K shares at avg. $14.92$159K

		Type	Shares	Price		Ownership
May 14, 2026	CERT Certara, Inc.	Exercise(M)	15,757	-	$0	Direct
May 14, 2026	CERT Certara, Inc.	Award(A) Restricted Stock Units	33,222	-	-	Direct
Mar 31, 2026	OGN Organon & Co.	Award(A) Restricted Stock Units	321,368	-	-	Direct
Mar 31, 2026	OGN Organon & Co.	Exercise(M)	12,047	-	$0	Direct
Mar 31, 2026	OGN Organon & Co.	Tax Payment(F)	4,127	$5.70	$23,524	Direct
Mar 31, 2026	OGN Organon & Co.	Exercise(M)	21,546	-	$0	Direct
Mar 31, 2026	OGN Organon & Co.	Tax Payment(F)	7,380	$5.70	$42,066	Direct
Mar 31, 2026	OGN Organon & Co.	Award(A) Restricted Stock Units	83,472	-	-	Direct
Feb 27, 2026	OGN Organon & Co.	Award(A)	12,020	-	$0	Direct
Feb 27, 2026	OGN Organon & Co.	Tax Payment(F)	4,117	$7.23	$29,766	Direct
Feb 27, 2026	OGN Organon & Co.	Tax Payment(F)	14,887	$7.17	$106,740	Direct
Feb 27, 2026	OGN Organon & Co.	Award(A)	42,599	-	$0	Direct
May 21, 2025	CERT Certara, Inc.	Exercise(M)	11,928	-	-	Direct
May 21, 2025	CERT Certara, Inc.	Award(A) Restricted Stock Units	15,757	-	-	Direct
May 5, 2025	OGN Organon & Co.	Purchase(P)	11,400	$8.82	$100,548	Direct
Mar 31, 2025	OGN Organon & Co.	Tax Payment(F)	5,933	$14.51	$86,088	Direct
Mar 31, 2025	OGN Organon & Co.	Exercise(M)	7,754	-	-	Direct
Mar 31, 2025	OGN Organon & Co.	Tax Payment(F)	3,819	$14.51	$55,414	Direct
Mar 31, 2025	OGN Organon & Co.	Exercise(M)	12,046	-	-	Direct
Mar 31, 2025	OGN Organon & Co.	Tax Payment(F)	7,422	$14.51	$107,693	Direct
Mar 31, 2025	OGN Organon & Co.	Exercise(M)	15,070	-	-	Direct
Mar 31, 2025	OGN Organon & Co.	Award(A) Stock Option (right to buy)	317,656	-	-	Direct
Mar 31, 2025	OGN Organon & Co.	Award(A) Restricted Stock Units	64,640	-	-	Direct
Feb 20, 2025	OGN Organon & Co.	Award(A)	30,414	-	-	Direct
Feb 20, 2025	OGN Organon & Co.	Tax Payment(F)	10,662	$14.92	$159,077	Direct

1-25 of 29 transactions

About WALSH MATTHEW M

WALSH MATTHEW M (SEC CIK 0001269428) files insider reports with the SEC as Director of Certara, Inc. (CERT) and Chief Financial Officer of Organon & Co. (OGN).

Signal8 holds 8 ownership filings by WALSH MATTHEW M, all Form 4s, filed between Sep 5, 2024 and May 15, 2026. Those filings report 29 transactions, from Sep 3, 2024 to May 14, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on WALSH MATTHEW M's filings is in JERSEY CITY, NJ.

Recent filings by WALSH MATTHEW M

May 14, 2026: Option exercise of CERT shares (Form 4, code M).
May 14, 2026: Grant or award of CERT derivative securities (Form 4, code A).
Mar 31, 2026: Grant or award of OGN derivative securities (Form 4, code A).
Mar 31, 2026: Option exercise of OGN shares (Form 4, code M).
Mar 31, 2026: Tax withholding of OGN shares (Form 4, code F).

Other insiders filing for Certara, Inc. (CERT)

Mohammed Faiz, Interim CFO
Anhalt Rona, Chief Human Resources Officer
Corcoran Daniel, SVP and General Counsel
Collins Cynthia, Director
Reynders John V W, Director
BROSHY ERAN, Director

How to read Form 4 transaction codes