Exhibit 21.1
List of Subsidiaries of Syneos Health, Inc.
| 
 | Jurisdiction | |
| Addison Whitney LLC | 
 | North Carolina | 
| Allidura Communications LLC | 
 | Delaware | 
| AmberCRO Armenia Limited | 
 | Armenia | 
| BioSector 2 LLC | 
 | New York | 
| Cadent Medical Communications, LLC | 
 | Ohio | 
| Caerus Marketing Group, LLC | 
 | California | 
| Chamberlain Communications Group LLC | 
 | Delaware | 
| Chandler Chicco Agency, L.L.C. | 
 | New York | 
| Gerbig Snell/Weisheimer Advertising, LLC | 
 | Ohio | 
| Groupe Synteract Canada, S.E.C. / Synteract Group Canada, L.P. | 
 | Québec | 
| Haas & Health Partner Public Relations GmbH | 
 | Germany | 
| Harrison Clinical Research AR S.A. | 
 | Argentina | 
| Harrison Clinical Research Limited | 
 | United Kingdom | 
| Harrison Clinical Research Peru S.A.C. | 
 | Peru | 
| HCR Acquisition GmbH | 
 | Germany | 
| Illingworth Research Group (Australia) Pty Ltd. | 
 | Australia | 
| Illingworth Research Group (France) SARL | 
 | France | 
| Illingworth Research Group (Italy) S.R.L. | 
 | Italy | 
| Illingworth Research Group (Spain) Sociedad Limitada | 
 | Spain | 
| Illingworth Research Group (USA) Inc. | 
 | Delaware | 
| Illingworth Research Group Limited | 
 | England & Wales | 
| Illingworth Research Limited | 
 | England & Wales | 
| Improved Outcome Kabushiki Kaisha | 
 | Japan | 
| INC Research BR Servicos de Pesquisas Clinicas Ltda. | 
 | Brazil | 
| Inc Research Branches Limited - Jordan Branch | 
 | Jordan | 
| INC Research Clinical Services Mexico Limited, S.A. de C.V. | 
 | Mexico | 
| INC Research CRO Argentina S.R.L. | 
 | Argentina | 
| INC Research CRO Malaysia Sdn. Bhd. | 
 | Malaysia | 
| INC Research do Brasil - Pesquisas Clínicas Ltda. | 
 | Brazil | 
| INC Research South Korea | 
 | Korea (the Republic of) | 
| INC Research UK Limited - Portugal Rep Office | 
 | Portugal | 
| INC Research, S.A. de C.V. | 
 | Mexico | 
| INCResearch Australia Holdings Pty Limited | 
 | Australia | 
| INCResearch Australia Pty Limited | 
 | Australia | 
| inVentiv European Holdings Limited | 
 | United Kingdom | 
| inVentiv Health (Hong Kong) Limited | 
 | Hong Kong | 
| inVentiv Health (Malaysia) SDN. BHD. | 
 | Malaysia | 
| inVentiv Health Clinical Mexico, S.A. de C.V. | 
 | Mexico | 
| inVentiv Health Clinical Peru S.A. | 
 | Peru | 
| inVentiv Health Clinical Uruguay SRL | 
 | Uruguay | 
| inVentiv Health Clinical, LLC | 
 | Delaware | 
| inVentiv Health Korea LLC | 
 | Korea (the Republic of) | 
| inVentiv Health Philippines, Inc. | 
 | Philippines | 
| inVentiv Health Singapore Pte Ltd Taipei Branch | 
 | Taiwan (Province of China) | 
| inVentiv Health Singapore Pte. Ltd. | 
 | Singapore | 
| inVentiv Health Ukraine LLC | 
 | Ukraine | 
| inVentiv International Pharma Services Private Ltd. | 
 | India | 
| JourneyBegins LLC | 
 | Delaware | 
| Kendle Americas Investment Inc. | 
 | Ohio | 
| Kendle Americas Management Inc. | 
 | Ohio | 
| Kendle India Private Limited | 
 | India | 
| Kendle NC LLC | 
 | North Carolina | 
| Kendle Servicios, S.A. de C.V. | 
 | Mexico | 
| Kinapse India Scientific Services Private Limited | 
 | India | 
| Kinapse Limited | 
 | United Kingdom | 
| Kinapse, Inc. | 
 | Delaware | 
| Limited Liability Company Syneos Health RUS | 
 | Russian Federation | 
| Litmus Medical Marketing Services LLC | 
 | New York | 
| Navicor Group, LLC | 
 | Ohio | 
| Palio + Ignite, LLC | 
 | Ohio | 
| Pharmaceutical Institute, LLC | 
 | North Carolina | 
| PNET US, LLC | 
 | Delaware | 
| PT Syneos Health Indonesia | 
 | Indonesia | 
| Research Nurses Limited | 
 | England & Wales | 
| RxDataScience, Inc. | 
 | Delaware | 
| Servicios Clinicos INC Research Chile Limitada | 
 | Chile | 
| Sharpview Ophthalmology Limited | 
 | United Kingdom | 
| SHCR Holdings Corporation | 
 | Delaware | 
| SIA Syneos Health Latvia | 
 | Latvia | 
| StudyKIK Corporation | 
 | Delaware | 
| StudyKIK, LLC | 
 | California | 
| Syneos Health (Barbados) SRL | 
 | Barbados | 
| Syneos Health (Barbados) SRL, LLC | 
 | Texas | 
| Syneos Health (Beijing) Inc. Ltd. 赛纽仕医药信息咨询(北京)有限公司 | 
 | China | 
| Syneos Health (Shanghai ) Inc. Ltd. Dalian Branch 赛纽仕医药咨询(上海)有限公司大连分公司 | 
 | China | 
| Syneos Health (Shanghai) Inc. Ltd. Jingan Branch 赛纽仕医药咨询(上海)有限公司静安分公司 | 
 | China | 
| Syneos Health (Shanghai) Inc. Ltd. 赛纽仕医药咨询(上海)有限公司 | 
 | China | 
| Syneos Health (Thailand) Limited | 
 | Thailand | 
| Syneos Health Argentina S.A. | 
 | Argentina | 
| Syneos Health Australia Pty Ltd | 
 | Australia | 
| Syneos Health Austria GmbH | 
 | Austria | 
| Syneos Health BA Limited | 
 | United Kingdom | 
| Syneos Health Belgium BV | 
 | Belgium | 
| Syneos Health Branches Limited | 
 | United Kingdom | 
| Syneos Health Brasil Ltda | 
 | Brazil | 
| Syneos Health Brasil Ltda. | 
 | Brazil | 
| Syneos Health Bulgaria EOOD | 
 | Bulgaria | 
| Syneos Health Canada Inc. | 
 | Ontario | 
| Syneos Health Canada LP | 
 | Ontario | 
| Syneos Health Canada ULC | 
 | Nova Scotia | 
| Syneos Health Chile S.A. | 
 | Chile | 
| Syneos Health Clinical K.K. | 
 | Japan | 
| Syneos Health Clinical Lab, Inc. | 
 | New Jersey | 
| Syneos Health Clinical Ltd | 
 | Israel | 
| Syneos Health Clinical Research Services, LLC | 
 | Delaware | 
| Syneos Health Clinical Spain, S.L.U. | 
 | Spain | 
| Syneos Health Clinical SRE, LLC | 
 | Delaware | 
| Syneos Health Clinical, Inc. | 
 | Delaware | 
| Syneos Health Clinical, LLC | 
 | Delaware | 
| Syneos Health Clinique Inc. | 
 | Canada | 
| Syneos Health Colombia Ltda | 
 | Colombia | 
| Syneos Health Commercial Europe Limited | 
 | United Kingdom | 
| Syneos Health Commercial Europe Limited - the Netherlands branch | 
 | Netherlands | 
| Syneos Health Commercial France Sarl | 
 | France | 
| Syneos Health Commercial Germany GmbH | 
 | Germany | 
| Syneos Health Commercial Italy S.R.L. | 
 | Italy | 
| Syneos Health Commercial K.K. | 
 | Japan | 
| Syneos Health Commercial Services, LLC | 
 | New Jersey | 
| Syneos Health Commercial Spain S.L. | 
 | Spain | 
| Syneos Health Communications Europe Limited | 
 | United Kingdom | 
| Syneos Health Communications France S.a.r.l. | 
 | France | 
| Syneos Health Communications Germany GmbH | 
 | Germany | 
| Syneos Health Communications Holding Corp. | 
 | Delaware | 
| Syneos Health Communications UK Limited | 
 | United Kingdom | 
| Syneos Health Communications, Inc. | 
 | Ohio | 
| Syneos Health Consulting, Inc. | 
 | North Carolina | 
| Syneos Health Costa Rica S.A. | 
 | Costa Rica | 
| Syneos Health Croatia d.o.o. | 
 | Croatia | 
| Syneos Health CZ s.r.o. | 
 | Czech Republic | 
| Syneos Health d.o.o. Beograd | 
 | Serbia | 
| Syneos Health Denmark ApS | 
 | Denmark | 
| Syneos Health Egypt, Limited Liability Company | 
 | Egypt | 
| Syneos Health Finland Oy | 
 | Finland | 
| Syneos Health France SARL | 
 | France | 
| Syneos Health G.K. | 
 | Japan | 
| Syneos Health Georgia LLC | 
 | Georgia | 
| Syneos Health Germany GmbH | 
 | Germany | 
| Syneos Health Germany GmbH Sede Secondaria | 
 | Italy | 
| Syneos Health Guatemala S.A. | 
 | Guatemala | 
| Syneos Health Hellas Single Member S.A. | 
 | Greece | 
| Syneos Health Holdings (Hong Kong) Limited | 
 | Hong Kong | 
| Syneos Health Holdings Germany GmbH | 
 | Germany | 
| Syneos Health Holdings UK Limited | 
 | United Kingdom | 
| Syneos Health Holdings, Inc. | 
 | Delaware | 
| Syneos Health Hong Kong Limited | 
 | Hong Kong | 
| Syneos Health Hungary Korlátolt Felelősségű Társaság | 
 | Hungary | 
| Syneos Health II L.P. | 
 | United Kingdom | 
| Syneos Health International Holdings Limited | 
 | United Kingdom | 
| Syneos Health Investment, LLC | 
 | Delaware | 
| Syneos Health Ireland Limited | 
 | Ireland | 
| Syneos Health Italy S.R.L. | 
 | Italy | 
| Syneos Health IVH UK Limited | 
 | United Kingdom | 
| Syneos Health Klinik Arastirma Limited Sirketi | 
 | Turkey | 
| Syneos Health Lebanon SARL | 
 | Lebanon | 
| Syneos Health Medical Communications, LLC | 
 | Ohio | 
| Syneos Health Netherlands B.V. | 
 | Netherlands | 
| Syneos Health New Zealand Limited | 
 | New Zealand | 
| Syneos Health Norway AS | 
 | Norway | 
| Syneos Health Peru S.R.L. | 
 | Peru | 
| Syneos Health Philippines, Inc. | 
 | Philippines | 
| Syneos Health Poland sp. z o.o. | 
 | Poland | 
| Syneos Health Portugal, Unipessoal LDA | 
 | Portugal | 
| Syneos Health Public Relations Holding, LLC | 
 | Delaware | 
| Syneos Health Receivables LLC | 
 | Delaware | 
| Syneos Health Research & Insights, LLC | 
 | Delaware | 
| Syneos Health Romania S.R.L. | 
 | Romania | 
| Syneos Health Singapore Pte. Ltd | 
 | Singapore | 
| Syneos Health Slovakia s.r.o. | 
 | Slovakia | 
| Syneos Health South Africa (Pty) Limited | 
 | South Africa | 
| Syneos Health Sweden AB | 
 | Sweden | 
| Syneos Health Switzerland GmbH | 
 | Switzerland | 
| Syneos Health UK Limited | 
 | United Kingdom | 
| Syneos Health UK Limited - Jordan Branch | 
 | Jordan | 
| Syneos Health Ukraine Limited Liability Company | 
 | Ukraine | 
| Syneos Health US, Inc. | 
 | Delaware | 
| Syneos Health, Inc. | 
 | Delaware | 
| Syneos Health, LLC | 
 | Delaware | 
| Syneos Pharma Partners, Co., Ltd. | 
 | Japan | 
| Synteract (Pty) Ltd | 
 | South Africa | 
| Synteract GmbH | 
 | Germany | 
| Synteract HCR Limited | 
 | United Kingdom | 
| Synteract Lanka (Pvt) Ltd | 
 | Sri Lanka | 
| Synteract, Inc. | 
 | California | 
| SynteractHCR Benelux NV | 
 | Belgium | 
| SynteractHCR Corporation | 
 | Delaware | 
| SynteractHCR Denmark ApS | 
 | Denmark | 
| SynteractHCR Eastern Europe Forschungsgesellschaft mbH | 
 | Austria | 
| SynteractHCR France SAS | 
 | France | 
| SynteractHCR Group GmbH | 
 | Germany | 
| SynteractHCR Holdings Corporation | 
 | Delaware | 
| SynteractHCR Iberica, S.L. | 
 | Spain | 
| SynteractHCR Italia S.R.L. | 
 | Italy | 
| SynteractHCR Latin America Holding GmbH | 
 | Germany | 
| SynteractHCR Mexico S.A. de C.V. | 
 | Mexico | 
| SynteractHCR Poland sp.zo.o | 
 | Poland | 
| SynteractHCR RUS OOO | 
 | Russian Federation | 
| SynteractHCR Sweden AB | 
 | Sweden | 
| SynteractHCR Ukraine LLC | 
 | Ukraine | 
| SynteractHCR, s.r.o. | 
 | Czech Republic | 
| Taiwan Syneos Health Company Limited 台灣賽紐仕醫藥股份有限公司 | 
 | Taiwan (Province of China) | 
| Taylor Strategy Partners, LLC | 
 | Ohio | 
| The Selva Group, LLC | 
 | Ohio |