Chirfi Guindo

CIK: 0001722753

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)5 (27.8%)

Position reduction

Option Exercises (M)2 (11.1%)

Derivative conversions

Awards (A)9 (50.0%)

Compensation grants

Other (G, F, J, C, D, …)2 (11.1%)

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

Companies & Roles (2)

MRK

Merck & Co., Inc.

Officer

BEAM

Beam Therapeutics Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (18 total)

MRK
Merck & Co., Inc.
Aug 13, 2026
Sale(S)
Direct
10K shares at avg. $135.00$1.4M
MRK
Merck & Co., Inc.
Aug 6, 2026
Sale(S)
Direct
15K shares at avg. $131.00$2.0M
BEAM
Beam Therapeutics Inc.
Jun 3, 2026
Award(A)
Stock Option (Right to Buy)
Direct
19.7K shares-
MRK
Merck & Co., Inc.
May 5, 2026
Award(A)
Stock Option (Right to Buy)
Direct
19.4K shares-
MRK
Merck & Co., Inc.
May 5, 2026
Award(A)
Restricted Stock Unit
Direct
6.6K shares-
MRK
Merck & Co., Inc.
Apr 29, 2026
Exercise(M)
Direct
2K shares at avg. $110.03$216K
MRK
Merck & Co., Inc.
Apr 29, 2026
Tax Payment(F)
Direct
969 shares at avg. $110.03$107K
MRK
Merck & Co., Inc.
Feb 12, 2026
Sale(S)
Direct
10K shares at avg. $121.46$1.2M
MRK
Merck & Co., Inc.
Feb 9, 2026
Sale(S)
Direct
10K shares at avg. $118.41$1.2M
MRK
Merck & Co., Inc.
Feb 5, 2026
Sale(S)
Direct
20K shares at avg. $121.88$2.4M
MRK
Merck & Co., Inc.
Jan 26, 2026
Award(A)
Direct
9.9K shares at avg. $107.40$1.1M
MRK
Merck & Co., Inc.
Aug 4, 2025
Exercise(M)
Direct
36.9K shares at avg. $79.29$2.9M
MRK
Merck & Co., Inc.
Aug 4, 2025
Tax Payment(F)
Direct
18.2K shares at avg. $79.29$1.4M
BEAM
Beam Therapeutics Inc.
Jun 4, 2025
Award(A)
Stock Option (Right to Buy)
Direct
33.7K shares-
MRK
Merck & Co., Inc.
Apr 29, 2025
Award(A)
Stock Option (Right to Buy)
Direct
26.9K shares-
MRK
Merck & Co., Inc.
Apr 29, 2025
Award(A)
Restricted Stock Unit
Direct
5.9K shares-
MRK
Merck & Co., Inc.
Jan 27, 2025
Award(A)
Direct
28.2K shares at avg. $97.94$2.8M
BEAM
Beam Therapeutics Inc.
Dec 2, 2024
Award(A)
Stock Option (Right to Buy)
Direct
39.1K shares-

		Type	Shares	Price		Ownership
Aug 13, 2026	MRK Merck & Co., Inc.	Sale(S)	10,000	$135.00	$1,350,000	Direct
Aug 6, 2026	MRK Merck & Co., Inc.	Sale(S)	15,000	$131.00	$1,965,000	Direct
Jun 3, 2026	BEAM Beam Therapeutics Inc.	Award(A) Stock Option (Right to Buy)	19,676	-	-	Direct
May 5, 2026	MRK Merck & Co., Inc.	Award(A) Stock Option (Right to Buy)	19,402	-	-	Direct
May 5, 2026	MRK Merck & Co., Inc.	Award(A) Restricted Stock Unit	6,628	-	-	Direct
Apr 29, 2026	MRK Merck & Co., Inc.	Exercise(M)	1,967	$110.03	$216,429	Direct
Apr 29, 2026	MRK Merck & Co., Inc.	Tax Payment(F)	969	$110.03	$106,619	Direct
Feb 12, 2026	MRK Merck & Co., Inc.	Sale(S)	10,000	$121.46	$1,214,562	Direct
Feb 9, 2026	MRK Merck & Co., Inc.	Sale(S)	10,000	$118.41	$1,184,101	Direct
Feb 5, 2026	MRK Merck & Co., Inc.	Sale(S)	20,000	$121.88	$2,437,676	Direct
Jan 26, 2026	MRK Merck & Co., Inc.	Award(A)	9,865	$107.40	$1,059,501	Direct
Aug 4, 2025	MRK Merck & Co., Inc.	Exercise(M)	36,903	$79.29	$2,926,039	Direct
Aug 4, 2025	MRK Merck & Co., Inc.	Tax Payment(F)	18,175	$79.29	$1,441,096	Direct
Jun 4, 2025	BEAM Beam Therapeutics Inc.	Award(A) Stock Option (Right to Buy)	33,662	-	-	Direct
Apr 29, 2025	MRK Merck & Co., Inc.	Award(A) Stock Option (Right to Buy)	26,867	-	-	Direct
Apr 29, 2025	MRK Merck & Co., Inc.	Award(A) Restricted Stock Unit	5,902	-	-	Direct
Jan 27, 2025	MRK Merck & Co., Inc.	Award(A)	28,158	$97.94	$2,757,795	Direct
Dec 2, 2024	BEAM Beam Therapeutics Inc.	Award(A) Stock Option (Right to Buy)	39,086	-	-	Direct

1-18 of 18 transactions

About Guindo Chirfi

Guindo Chirfi (SEC CIK 0001722753) files insider reports with the SEC as EVP, Access, Policy & Comms of Merck & Co., Inc. (MRK) and Director of Beam Therapeutics Inc. (BEAM).

Signal8 holds 15 ownership filings by Guindo Chirfi (1 Form 3, 14 Form 4), filed between Dec 4, 2024 and Aug 13, 2026. Those filings report 18 transactions, from Dec 2, 2024 to Aug 13, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Guindo Chirfi's filings is in RAHWAY, NJ.

Recent filings by Guindo Chirfi

Aug 13, 2026: Open-market sale of MRK shares (Form 4, code S).
Aug 6, 2026: Open-market sale of MRK shares (Form 4, code S).
Jun 3, 2026: Grant or award of BEAM derivative securities (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).

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