Research Pharmaceutical Services (RPSE) S-1 IPO registration

Exhibit 21.1

List of Subsidiaries

Name of Company	Jurisdiction of Incorporation
ReSearch Pharmaceutical Services, LLC	Delaware
Services de Recherché Pharmaceutique Inc.	Canada (Quebec)
RPS Do Brasil Servicos de Pesquisa LTDA	Brazil
RPS Global S.A.	Uruguay
RPS Latin America S.A.	Uruguay
RPS Chile Limitada	Chile
RPS Peru S.A.C.	Peru
RPS Research Mexico, S de RL de CV	Mexico
RPS Research Servicios, S de RL de CV	Mexico
RPS Research S.A.	Argentina
RPS Colombia LTDA	Colombia
RPS Bermuda, Ltd	Bermuda
RPS Netherlands, C.V.	Netherlands
RPS Netherlands, B.V.	Netherlands
RPS Germany GmbH	Germany
RPS Research Germany GmbH	Germany
RPS Iberica	Spain
RPS Research Spain SA	Spain
RPS France S.A.S.	France
RPS Research France	France
RPS Research UK Limited	United Kingdom
RPS Sweden AB	Sweden
RPS Research Norway AS	Norway
RPS Finland Oy	Finland
RPS Bulgaria EOOD	Bulgaria
RPS Croatian d.o.o.	Croatia
RPS Research Switzerland GmbH	Switzerland
RPS Czech Republic s.r.o	Czech Republic
RPS Belgium BVBA or SPRL	Belgium
RPS Romania S.R.L.	Romania

Name of Company	Jurisdiction of Incorporation
PHC RPS Ukraine	Ukraine
RPS Research LLC	Russia
RPS Research Austria GmbH	Austria
RPS Hungary Kft.	Hungary
RPS Research Italy S.r.l.	Italy
RPS Poland sp. z.o.o.	Poland
Research Pharmaceutical Services (Outsourcing Ireland) Limited	Ireland
Paramax International Inc.	British Virgin Islands
Paramax International (Beijing) Inc.	China
RPS Research Inc.	Korea
RPS Malaysia Sdn. Bhd.	Malaysia
RPS Research Philippines	Philippines
RPS Research Singapore PTE Ltd	Singapore
RPS Taiwan, Ltd.	Taiwan
RPS Research Thailand	Thailand
RPS Japan	Japan
RPS Hong Kong Limited	Hong Kong
RPS Australia Pty Ltd.	Australia
RPS Research South Africa (Proprietary) Limited	South Africa