SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Capone Michael L (Last) (First) (Middle) C/O MEDIDATA SOLUTIONS, INC. 350 HUDSON STREET, FLOOR 9 (Street) NEW YORK NY 10014 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Medidata Solutions, Inc. [ MDSO ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) Chief Operating Officer
	3. Date of Earliest Transaction (Month/Day/Year) 02/23/2017
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	02/23/2017		A(1)		43,186	A	$0	182,442	D
Common Stock	02/24/2017		M		9,439(2)	A	$0	191,881	D
Common Stock	02/24/2017		F		3,490(3)	D	$55.6	188,391	D
Common Stock	02/24/2017		F		8,764(4)	D	$55.6	179,627	D
Common Stock	02/24/2017		F		2,873(4)	D	$55.6	176,754	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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
Restricted Stock Units (Performance-Related)	$0.0	02/23/2017		A		43,186		(5)	(5)	Common Stock	(5)	$0	43,186	D

Explanation of Responses:

1. Award of shares of restricted stock under the issuer's Second Amended & Restated 2009 Long-Term Incentive Plan (the "2009 LTIP") on February 23, 2017. The restrictions will lapse with respect to one-fourth of the shares on each of February 23, 2018, February 23, 2019, February 23, 2020, and February 23, 2021.

2. Represents restricted stock units earned in connection with a performance-based restricted stock unit ("PBRSU") award on February 13, 2015, based on achievement of certain TSR performance targets for the two years ended December 31, 2016. The restricted stock units were settled at 127% of the target grant amount. Each restricted stock unit represents a contingent right to receive one share of the issuer's common stock.

3. Shares withheld by Medidata to satisfy the tax withholding obligation in connection with the vesting of the PBRSU award referenced above.

4. Shares withheld by Medidata to satisfy the tax withholding obligation in connection with the vesting of previously awarded restricted stock.

5. Award of PBRSUs under the 2009 LTIP on February 23, 2017. The number of PBRSUs represents a target amount. Each PBRSU represents a contingent right to receive 0-200% of that target number of shares of the issuer's common stock, (i) 50% based on the issuer's TSR as compared to the TSR of companies in the Russell 2000 Index for the three years ending December 31, 2019, and (ii) 50% based on the Company's GAAP Net Income attainment for the three years ending December 31, 2019. The shares will vest immediately upon being earned.

Remarks:

	/s/ Kathryn E. Schneider, Attorney-in-Fact	02/27/2017
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
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