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Exhibit 21.1
ORGANON & CO.
LIST OF SUBSIDIARIES

Organon & Co., a Delaware corporation, had the U.S. and international subsidiaries shown below as of December 31, 2025. Organon & Co. is not a subsidiary of any other entity. Certain subsidiaries have been omitted as they are not significant in the aggregate.

NameCountry or State
of Incorporation or Organization
Organon Algeria SARLAlgeria
Organon Argentina S.R.L.Argentina
Organon Pharma Pty LtdAustralia
Organon Austria GmbHAustria
Organon Belgium BVBelgium
Organon Heist BVBelgium
Dermavant Sciences Ltd.Bermuda
Organon BH d.o.o.Bosnia
Organon Farmacêutica Ltda. Brazil
Organon Canada Inc. Canada
Organon Chile SpAChile
Organon Hong Kong LimitedPeople’s Republic of China
Organon (Shanghai) Pharmaceutical Technology Co., Ltd.People’s Republic of China
Organon (Shanghai) Pharmaceutical Trading Co., Ltd.People’s Republic of China
Organon Colombia S.A.S.Colombia
Organon Pharma Costa Rica S de R.L.Costa Rica
Organon Pharma d.o.o. Croatia
Organon Czech Republic s.r.o.Czech Republic
Organon Denmark ApSDenmark
Organon-Ecuador S.A.Ecuador
Organon Pharmaceutical Egypt LLCEgypt
Organon R&D Finland OyFinland
Organon Finland OyFinland
Organon France SASFrance
Organon Healthcare GmbHGermany
Organon Hungary Korlatolt Felelossegu TarsasagHungary
Fulford (India) Private LimitedIndia
Organon (India) Private LimitedIndia
PT Organon Pharma Indonesia Tbk Indonesia
Dermavant Sciences IRL LimitedIreland
Organon (Ireland) LtdIreland
Organon Pharma (Ireland) LimitedIreland
Organon Pharma Israel Ltd.Israel
Organon Italia S.r.l. Italy
Organon K.K.Japan
Organon Korea Co., Ltd. Republic of Korea
Organon Malaysia Sdn. Bhd.Malaysia
Organon Comercializadora, S. de R.L. de C.V.Mexico
Productos Farmaceuticos Organon Mexicana S. de R.L. de C.V.Mexico
Organon Pharma Mexico, S.A. de C.V.Mexico
Servicios Organon S. de R.L. de C.V. Mexico




Exhibit 21.1
Undra, S.A. de C.V.Mexico
Organon Maroc S.A.R.L. Morocco
GTS FI B.V.Netherlands
N.V. OrganonNetherlands
OBS Human Health Holding B.V.Netherlands
OBS International 9 B.V. Netherlands
Organon Mexico Holdings B.V.Netherlands
Organon (I.A.) B.V.Netherlands
Organon Asia Holdings B.V.Netherlands
Organon Foreign Debt Co-Issuer B.V.Netherlands
Organon Holdings 9 B.V.Netherlands
Organon International Holdings 9 B.V.Netherlands
Organon Participations B.V.Netherlands
Organon Pharma B.V.Netherlands
Organon New Zealand LimitedNew Zealand
Organon Norway A/SNorway
Organon Pharma S. de R.L. Panama
Organon BioSciences Peru S.R.L. Peru
Organon (Philippines) IncorporatedPhilippines
Organon Polska Sp. z.o.o.Poland
Organon Global Shared Services Center (GSS), Unipessoal Lda.Portugal
Organon Portugal, Sociedade Unipessoal Lda.Portugal
Organon Puerto Rico LLCPuerto Rico
Organon BioSciences S.R.L.Romania
Organon Limited Liability CompanyRussian Federation
Organon d.o.o. BeogradSerbia
Organon Asia Pacific Services Pte. Ltd.Singapore
Organon Singapore Pte. Ltd.Singapore
Organon Slovakia s.r.o.Slovakia
Organon South Africa Pty Ltd.South Africa
Organon Salud, S.L.Spain
Organon Sweden ABSweden
Dermavant Sciences GmbHSwitzerland
Organon Central East GmbHSwitzerland
Organon GmbHSwitzerland
Organon International GmbHSwitzerland
Organon International Services GmbHSwitzerland
Organon KSA GmbHSwitzerland
Organon (Thailand) Ltd. Thailand
Organon Turkey Ilaclari Limited SirketiTurkey
Organon Ukraine Limited Liability CompanyUkraine
Organon Pharma FZ-LLCUnited Arab Emirates
DashtagUnited Kingdom
Dermavant Holdings LimitedUnited Kingdom
Organon Pharma (UK) LimitedUnited Kingdom
Organon Limited Liability CompanyVietnam
Alydia Health, Inc.Delaware, USA
Dermavant Sciences, Inc.Delaware, USA
Organon Canada Holdings LLCDelaware, USA




Exhibit 21.1
Organon Finance LLCDelaware, USA
Organon Global Inc.Delaware, USA
Organon International LLCDelaware, USA
Organon LLCDelaware, USA
Organon 2 LLCDelaware, USA
Organon Pharma Holdings LLCDelaware, USA
Organon Pharma Holdings II LLCDelaware, USA
Organon Trade LLCDelaware, USA
Organon USA LLCNew Jersey, USA





Exhibit 21.1
ORGANON & CO.
LIST OF BRANCHES, REPRESENTATIVE OFFICES
AND SCIENTIFIC OFFICES

The following are branches, representative offices, and scientific offices of Organon & Co. as of December 31, 2025. Certain subsidiaries have been omitted as they are not significant in the aggregate.

NameCountry of Organization
Organon (I.A.) B.V. - Bulgaria BranchBulgaria
Organon (Shanghai) Pharmaceutical Technology Co., Ltd. - Beijing BranchPeople’s Republic of China
Organon (Shanghai) Pharmaceutical Technology Co., Ltd. - Guangzhou BranchPeople’s Republic of China
Organon (Shanghai) Pharmaceutical Technology Co., Ltd. - Hangzhou BranchPeople’s Republic of China
Organon (Shanghai) Pharmaceutical Technology Co., Ltd. – Xuhui BranchPeople’s Republic of China
Organon (Shanghai) Pharmaceutical Technology Co., Ltd. – Chengdu BranchPeople’s Republic of China
Organon Pharma B.V. - Cyprus BranchCyprus
Organon Central East GmbH Scientific OfficeEgypt
Organon Pharma B.V. - Estonia Representative OfficeEstonia
Organon Central East GmbH - Jordan Representative OfficeJordan
Organon Pharma B.V. - Latvia Representative OfficeLatvia
Organon Central East GmbH - Lebanon Representative OfficeLebanon
Organon Pharma B.V. - Lithuania Representative OfficeLithuania
Organon Belgium BV - Luxembourg BranchLuxembourg
Organon International Services GmbHNetherlands
Organon Central East GmbH - North Macedonia Representative OfficeNorth Macedonia
Organon KSA GmbH - Saudi Scientific OfficeSaudi Arabia
Organon Pharma B.V., Oss - Ljubljana BranchSlovenia
Organon (I.A.) B.V. - Taiwan BranchTaiwan, Province of China
The Representative Office of Organon Central East GmbH in Ho Chi Minh CityVietnam
The Representative Office of Organon Central East GmbH in HanoiVietnam
The Representative Office of Organon Hong Kong Limited in HanoiVietnam