Filing Details

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ------------------------------------------------------------------------------- SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO Section 240.13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO Section 240.13d-2 Under the Securities Exchange Act of 1934 (Amendment No. 5) MEDIDATA SOLUTIONS INC ---------------------------------------------- (Name of Issuer) COMMON STOCK ----------------------------------------------- (Title of Class of Securities) 58471A105 --------------------- (CUSIP Number) DECEMBER 31, 2018 --------------------- (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [x] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) Page 1 of 5 Pages

------------------------------------------------------------------------------- CUSIP No.: 58471A105 13G Page 2 of 5 Pages ................................................................................ 1. Names of Reporting Persons Sands Capital Management, LLC ................................................................................ 2. Check the Appropriate Box if a Member of a Group (a) [ ] (b) [ ] NOT APPLICABLE ................................................................................ 3. SEC Use Only ................................................................................ 4. Citizenship or Place of Organization Delaware, United States ................................................................................ Number of 5. Sole Voting Power: -0- Shares Beneficially ................................................................ Owned by Each Reporting 6. Shared Voting Power: -0- Person With ................................................................ 7. Sole Dispositive Power: -0- ................................................................ 8. Shared Dispositive Power: -0- ................................................................................ 9. Aggregate Amount Beneficially Owned by Each Reporting Person -0- ................................................................................ 10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares [ ] NOT APPLICABLE ................................................................................ 11. Percent of Class Represented by Amount in Row (9) 0.0% (1) ................................................................................ 12. Type of Reporting Person: IA ______________________________ (1) Based on 61,190,452 shares of common stock outstanding as reported in the Issuer's Form 10-Q as of October 26, 2018. ------------------------------------------------------------------------------- CUSIP No.: 58471A105 13G Page 3 of 5 Pages Item 1(a) Name of Issuer: MEDIDATA SOLUTIONS INC Item 1(b) Address of Issuer's Principal Executive Offices: 350 Hudson Street, 9th Floor, New York, NY 10014 Item 2(a) Name of Person Filing: SANDS CAPITAL MANAGEMENT, LLC Item 2(b) Address of Principal Business Office, or if None, Residence: 1000 WILSON BLVD., SUITE 3000, ARLINGTON, VA 22209 Item 2(c) Citizenship: DELAWARE, UNITED STATES Item 2(d) Title of Class of Securities: COMMON STOCK Item 2(e) CUSIP Number: 58471A105 Item 3 If this statement is filed pursuant to Sections 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: (a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o); (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c); (c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c); (d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8); (e) [X] An investment adviser in accordance with Section 240.13d-1(b)(1)(ii)(E); (f) [ ] An employee benefit plan or endowment fund in accordance with Section 240.13d-1(b)(1)(ii)(F); (g) [ ] A parent holding company or control person in accordance with Section 240.13d-1(b)(1)(ii)(G); (h) [ ] A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act (15 U.S.C. 80a-3); (j) [ ] A non-U.S. institution in accordance with Section 240.13d-1(b)(1)(ii)(J); (k) [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Section 240.13d-1(b)(1)(ii)(J), please specify the type of institution: ____ ------------------------------------------------------------------------------- CUSIP No.: 58471A105 13G Page 4 of 5 Pages Item 4. Ownership Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. (a) Amount beneficially owned: -0- (b) Percent of class: 0.0% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: -0- (ii) Shared power to vote or to direct the vote: -0- (iii) Sole power to dispose or to direct the disposition of: -0- (iv) Shared power to dispose or to direct the disposition of: -0- Item 5. Ownership of Five Percent or Less of a Class. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following [ X ]. Item 6. Ownership of More than Five Percent on Behalf of Another Person Not Applicable. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person. Not Applicable. Item 8. Identification and Classification of Members of the Group. Not Applicable. Item 9. Notice of Dissolution of Group. Not Applicable. ------------------------------------------------------------------------------- CUSIP No.: 58471A105 13G Page 5 of 5 Pages Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under Section 240.14a-11. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Sands Capital Management, LLC Date: January 10, 2019 By: /s/ Lisa M. Grozio ---------------------- Name: Lisa M. Grozio Title: Chief Compliance Officer