Johannes Jacobus Oosthuizen

CIK: 0001916310

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)2 (15.4%)

Position reduction

Option Exercises (M)2 (15.4%)

Derivative conversions

Awards (A)7 (53.8%)

Compensation grants

Other (G, F, J, C, D, …)2 (15.4%)

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

Companies & Roles (2)

VYLR

Vylor Inc.

Director

MRK

Merck & Co., Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (13 total)

VYLR
Vylor Inc.
Oct 22, 2026
Award(A)
Direct
2.6K shares-
MRK
Merck & Co., Inc.
May 5, 2026
Award(A)
Stock Option (Right to Buy)
Direct
31K shares-
MRK
Merck & Co., Inc.
May 5, 2026
Award(A)
Restricted Stock Unit
Direct
10.6K shares-
MRK
Merck & Co., Inc.
Apr 29, 2026
Exercise(M)
Direct
1.4K shares at avg. $110.03$152K
MRK
Merck & Co., Inc.
Apr 29, 2026
Tax Payment(F)
Direct
679 shares at avg. $110.03$75K
MRK
Merck & Co., Inc.
Feb 6, 2026
Sale(S)
Direct
15K shares at avg. $121.87$1.8M
MRK
Merck & Co., Inc.
Jan 26, 2026
Award(A)
Direct
5K shares at avg. $107.40$540K
MRK
Merck & Co., Inc.
Apr 29, 2025
Award(A)
Stock Option (Right to Buy)
Direct
18.8K shares-
MRK
Merck & Co., Inc.
Apr 29, 2025
Award(A)
Restricted Stock Unit
Direct
4.1K shares-
MRK
Merck & Co., Inc.
Feb 19, 2025
Sale(S)
Direct
8.5K shares at avg. $84.09$715K
MRK
Merck & Co., Inc.
Feb 8, 2025
Tax Payment(F)
Direct
6.4K shares at avg. $87.28$559K
MRK
Merck & Co., Inc.
Feb 8, 2025
Exercise(M)
Direct
13K shares at avg. $87.28$1.1M
MRK
Merck & Co., Inc.
Jan 27, 2025
Award(A)
Direct
8.7K shares at avg. $97.94$849K

		Type	Shares	Price		Ownership
Oct 22, 2026	VYLR Vylor Inc.	Award(A)	2,610	-	$0	Direct
May 5, 2026	MRK Merck & Co., Inc.	Award(A) Stock Option (Right to Buy)	31,044	-	-	Direct
May 5, 2026	MRK Merck & Co., Inc.	Award(A) Restricted Stock Unit	10,605	-	-	Direct
Apr 29, 2026	MRK Merck & Co., Inc.	Exercise(M)	1,377	$110.03	$151,511	Direct
Apr 29, 2026	MRK Merck & Co., Inc.	Tax Payment(F)	679	$110.03	$74,710	Direct
Feb 6, 2026	MRK Merck & Co., Inc.	Sale(S)	15,000	$121.87	$1,827,992	Direct
Jan 26, 2026	MRK Merck & Co., Inc.	Award(A)	5,026	$107.40	$539,792	Direct
Apr 29, 2025	MRK Merck & Co., Inc.	Award(A) Stock Option (Right to Buy)	18,807	-	-	Direct
Apr 29, 2025	MRK Merck & Co., Inc.	Award(A) Restricted Stock Unit	4,132	-	-	Direct
Feb 19, 2025	MRK Merck & Co., Inc.	Sale(S)	8,500	$84.09	$714,745	Direct
Feb 8, 2025	MRK Merck & Co., Inc.	Tax Payment(F)	6,404	$87.28	$558,941	Direct
Feb 8, 2025	MRK Merck & Co., Inc.	Exercise(M)	13,002	$87.28	$1,134,815	Direct
Jan 27, 2025	MRK Merck & Co., Inc.	Award(A)	8,664	$97.94	$848,552	Direct

1-13 of 13 transactions

About Oosthuizen Johannes Jacobus

Oosthuizen Johannes Jacobus (SEC CIK 0001916310) files insider reports with the SEC as Director of Vylor Inc. (VYLR) and President, U.S. Market of Merck & Co., Inc. (MRK).

Signal8 holds 10 ownership filings by Oosthuizen Johannes Jacobus (1 Form 3, 9 Form 4), filed between Jan 29, 2025 and Oct 26, 2026. Those filings report 13 transactions, from Jan 27, 2025 to Oct 22, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Oosthuizen Johannes Jacobus's filings is in RAHWAY, NJ.

Recent filings by Oosthuizen Johannes Jacobus

Oct 22, 2026: Grant or award of VYLR shares (Form 4, code A).
May 5, 2026: Grants or awards of MRK derivative securities (2 lines, Form 4, code A).
Apr 29, 2026: Option exercise of MRK shares (Form 4, code M).
Apr 29, 2026: Tax withholding of MRK shares (Form 4, code F).
Feb 6, 2026: Open-market sale of MRK shares (Form 4, code S).

Other insiders filing for Vylor Inc. (VYLR)

Kalathur Rajesh, Director
Aguilar Moses Victor Javier, Director
Eathington Samuel R, Chief Technology Officer
O'Connor Judd M, Chief Commercial and Operation
Lutz Marcos M, Director
Grimes Karen H., Director

How to read Form 4 transaction codes