Insider Trading & Ownership of Chirfi Guindo

Location: Cambridge, MA
Summary: The estimated net worth of Chirfi Guindo is at least $15.4M dollars as of August 5, 2025. Chirfi Guindo is the Chief Marketing Officer of Merck & Co., Inc. and owns shares of Merck & Co., Inc. (MRK) stock worth about $10.3M. Chirfi Guindo is the Head of Glob Prod Strat & Com of BIOGEN INC. and owns shares of BIOGEN INC. (BIIB) stock worth about $4.14M. Chirfi Guindo is the Director of Beam Therapeutics Inc. and owns shares of Beam Therapeutics Inc. (BEAM) stock worth about $954K.
Signature: /s/ Kelly Grez, as attorney-in-fact for Mr. Chirfi Guindo
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Ownership of Chirfi Guindo

Symbol	Company	Relationship	Holdings Value	Report Period
MRK	Merck & Co., Inc.	Chief Marketing Officer	$10.3M	Aug 4, 2025
BIIB	BIOGEN INC.	Head of Glob Prod Strat & Com	$4.14M	Feb 18, 2022
BEAM	Beam Therapeutics Inc.	Director	$954K	Jun 4, 2025

Sym	Company	Class	Transaction	%	Value $	* Price $	Shares	Shares After	Date	Ownership

* An asterisk sign (*) next to the price indicates that the price is likely invalid.