Jennifer Zachary

CIK: 0001737231

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)4 (21.1%)

Position reduction

Option Exercises (M)6 (31.6%)

Derivative conversions

Awards (A)8 (42.1%)

Compensation grants

Other (G, F, J, C, D, …)1 (5.3%)

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

Companies & Roles (2)

MRK

Merck & Co., Inc.

Officer

RGNX

REGENXBIO Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (19 total)

MRK
Merck & Co., Inc.
Aug 12, 2026
Sale(S)
Direct
80.3K shares at avg. $133.46$10.7M
MRK
Merck & Co., Inc.
Aug 12, 2026
Exercise(M)
Direct
13.4K shares at avg. $84.71$1.1M
MRK
Merck & Co., Inc.
Aug 12, 2026
Exercise(M)
Direct
41.5K shares at avg. $117.89$4.9M
RGNX
REGENXBIO Inc.
May 29, 2026
Award(A)
Direct
9.8K shares-
MRK
Merck & Co., Inc.
May 5, 2026
Award(A)
Stock Option (Right to Buy)
Direct
35.3K shares-
MRK
Merck & Co., Inc.
May 5, 2026
Award(A)
Restricted Stock Unit
Direct
12.1K shares-
MRK
Merck & Co., Inc.
Apr 29, 2026
Tax Payment(F)
Direct
1.5K shares at avg. $110.03$160K
MRK
Merck & Co., Inc.
Apr 29, 2026
Exercise(M)
Direct
3K shares at avg. $110.03$325K
MRK
Merck & Co., Inc.
Feb 9, 2026
Sale(S)
Direct
56.8K shares at avg. $119.15$6.8M
MRK
Merck & Co., Inc.
Feb 9, 2026
Exercise(M)
Direct
56.8K shares at avg. $119.15$6.8M
MRK
Merck & Co., Inc.
Feb 9, 2026
Sale(S)
Direct
25.9K shares at avg. $119.15$3.1M
MRK
Merck & Co., Inc.
Feb 9, 2026
Sale(S)
Direct
38.8K shares at avg. $119.15$4.6M
MRK
Merck & Co., Inc.
Feb 9, 2026
Exercise(M)
Direct
38.8K shares at avg. $119.15$4.6M
MRK
Merck & Co., Inc.
Feb 9, 2026
Exercise(M)
Direct
25.9K shares at avg. $119.15$3.1M
MRK
Merck & Co., Inc.
Jan 26, 2026
Award(A)
Direct
11.6K shares at avg. $107.40$1.2M
RGNX
REGENXBIO Inc.
May 30, 2025
Award(A)
Direct
7.8K shares-
MRK
Merck & Co., Inc.
Apr 29, 2025
Award(A)
Restricted Stock Unit
Direct
8.9K shares-
MRK
Merck & Co., Inc.
Apr 29, 2025
Award(A)
Stock Option (Right to Buy)
Direct
40.3K shares-
MRK
Merck & Co., Inc.
Jan 27, 2025
Award(A)
Direct
25.4K shares at avg. $97.94$2.5M

		Type	Shares	Price		Ownership
Aug 12, 2026	MRK Merck & Co., Inc.	Sale(S)	80,315	$133.46	$10,718,495	Direct
Aug 12, 2026	MRK Merck & Co., Inc.	Exercise(M)	13,433	$84.71	$1,137,909	Direct
Aug 12, 2026	MRK Merck & Co., Inc.	Exercise(M)	41,494	$117.89	$4,891,728	Direct
May 29, 2026	RGNX REGENXBIO Inc.	Award(A)	9,807	-	$0	Direct
May 5, 2026	MRK Merck & Co., Inc.	Award(A) Stock Option (Right to Buy)	35,312	-	-	Direct
May 5, 2026	MRK Merck & Co., Inc.	Award(A) Restricted Stock Unit	12,064	-	-	Direct
Apr 29, 2026	MRK Merck & Co., Inc.	Tax Payment(F)	1,454	$110.03	$159,984	Direct
Apr 29, 2026	MRK Merck & Co., Inc.	Exercise(M)	2,951	$110.03	$324,699	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Sale(S)	56,792	$119.15	$6,766,892	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Exercise(M)	56,792	$119.15	$6,766,892	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Sale(S)	25,946	$119.15	$3,091,523	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Sale(S)	38,835	$119.15	$4,627,276	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Exercise(M)	38,835	$119.15	$4,627,276	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Exercise(M)	25,946	$119.15	$3,091,523	Direct
Jan 26, 2026	MRK Merck & Co., Inc.	Award(A)	11,583	$107.40	$1,244,014	Direct
May 30, 2025	RGNX REGENXBIO Inc.	Award(A)	7,768	-	-	Direct
Apr 29, 2025	MRK Merck & Co., Inc.	Award(A) Restricted Stock Unit	8,854	-	-	Direct
Apr 29, 2025	MRK Merck & Co., Inc.	Award(A) Stock Option (Right to Buy)	40,301	-	-	Direct
Jan 27, 2025	MRK Merck & Co., Inc.	Award(A)	25,423	$97.94	$2,489,929	Direct

1-19 of 19 transactions

About Zachary Jennifer

Zachary Jennifer (SEC CIK 0001737231) files insider reports with the SEC as EVP, General Counsel of Merck & Co., Inc. (MRK) and Director of REGENXBIO Inc. (RGNX).

Signal8 holds 9 ownership filings by Zachary Jennifer, all Form 4s, filed between Jan 29, 2025 and Aug 13, 2026. Those filings report 19 transactions, from Jan 27, 2025 to Aug 12, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Zachary Jennifer's filings is in RAHWAY, NJ.

Recent filings by Zachary Jennifer

Aug 12, 2026: Open-market sale of MRK shares (Form 4, code S).
Aug 12, 2026: Option exercises of MRK shares (2 lines, Form 4, code M).
May 29, 2026: Grant or award of RGNX shares (Form 4, code A).
May 5, 2026: Grants or awards of MRK derivative securities (2 lines, Form 4, code A).
Apr 29, 2026: Tax withholding of MRK shares (Form 4, code F).

Other insiders filing for Merck & Co., Inc. (MRK)

DIAZ PAUL J, Director
Maraldo David R., EVP & Pres. MMD
Seidman Christine E, Director
Karsanbhai Surendralal Lanca, Director
Coe Mary Ellen, Director
Gupta Gaurav K, EVP, CIDO

How to read Form 4 transaction codes