<SEC-DOCUMENT>0001020066-15-000007-index.html : 20150212
<SEC-HEADER>0001020066-15-000007.hdr.sgml : 20150212
<ACCEPTANCE-DATETIME>20150212163743
ACCESSION NUMBER:		0001020066-15-000007
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20150212
DATE AS OF CHANGE:		20150212

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Medidata Solutions, Inc.
		CENTRAL INDEX KEY:			0001453814
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				522319066
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-84929
		FILM NUMBER:		15606868

	BUSINESS ADDRESS:	
		STREET 1:		350 HUDSON ST.,  9TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10014
		BUSINESS PHONE:		212.918.1800

	MAIL ADDRESS:	
		STREET 1:		350 HUDSON ST.,  9TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10014

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SANDS CAPITAL MANAGEMENT, LLC
		CENTRAL INDEX KEY:			0001020066
		IRS NUMBER:				202830751
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		SANDS CAPITAL MANAGEMENT, LLC
		STREET 2:		1101 WILSON BLVD, SUITE 2300
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22209
		BUSINESS PHONE:		703-562-4000

	MAIL ADDRESS:	
		STREET 1:		SANDS CAPITAL MANAGEMENT, LLC
		STREET 2:		1101 WILSON BLVD, SUITE 2300
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22209

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SANDS CAPITAL MANAGEMENT, LP
		DATE OF NAME CHANGE:	20051024

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SANDS CAPITAL MANAGEMENT
		DATE OF NAME CHANGE:	20050804

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SANDS CAPITAL MANAGEMENT INC
		DATE OF NAME CHANGE:	19990317
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>mdso0215.txt
<DESCRIPTION>13G
<TEXT>
Document 1 - file: mdso0215.txt

</DOCUMENT>
</SEC-DOCUMENT>