Sec Form 4 Filing - Dominguez Carlos @ Medidata Solutions, Inc. - 2019-10-28

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Dominguez Carlos 2. Issuer Name and Ticker or Trading Symbol Medidata Solutions, Inc. [ MDSO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O MEDIDATA SOLUTIONS, INC., 350 HUDSON STREET, 9TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 10/28/2019 (Street) NEW YORK, NY10014 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 10/28/2019( 1 ) D 74,598 ( 2 ) D $ 92.25 ( 2 ) 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (right to buy) $ 7.67 10/28/2019 D 5,924 ( 3 ) ( 4 ) 05/18/2020 Common Stock 5,924 ( 3 ) 0 D Stock Option (right to buy) $ 11.5 10/28/2019 D 5,714 ( 3 ) ( 4 ) 05/31/2021 Common Stock 5,714 ( 3 ) 0 D Stock Option (right to buy) $ 13.99 10/28/2019 D 5,214 ( 3 ) ( 4 ) 05/16/2022 Common Stock 5,214 ( 3 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Dominguez Carlos C/O MEDIDATA SOLUTIONS, INC. 350 HUDSON STREET, 9TH FLOOR NEW YORK, NY10014 X Signatures /s/ Michael I. Otner, Attorney-in-Fact 10/28/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On October 28, 2019, pursuant to the Agreement and Plan of Merger, dated as of June 11, 2019, by and among Dassault Systemes SE ("DS"), Dassault Systemes Americas Corp., a Delaware corporation ("Parent"), 3DS Acquisition 6 Corp., a Delaware corporation and a wholly-owned subsidiary of Parent ("Merger Sub"), and Medidata Solutions, Inc., a Delaware corporation (the "Issuer"), Merger Sub merged with and into the Issuer, with the Issuer surviving as a wholly-owned subsidiary of Parent and an indirect wholly-owned subsidiary of DS (the "Merger"). ( 2 )Disposed of pursuant to the Merger Agreement and by virtue of the Merger, in which each share of Medidata common stock, par value $0.01 per share ("Issuer Common Stock"), issued and outstanding immediately prior to the completion of the Merger (other than restricted share awards held by continuing employees) was converted into the right to receive $92.25 in cash and without interest (the "Merger Consideration"). ( 3 )Pursuant to the Merger Agreement and by virtue of the Merger, each option to purchase Issuer Common Stock will be cancelled and converted into the right to receive an amount in cash (without interest and subject to deduction for any required withholding tax) equal to the product of (1) the total number of shares of Issuer Common Stock then covered by such option multiplied by (2) the excess, if any, of $92.25 per share over the exercise price per share under such option. ( 4 )These options are fully vested and exercisable.

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