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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1453814	Medidata Solutions Inc.	MDSO	Services-Prepackaged Software (7372)	522319066

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1560574	Eileen Schloss	C/O Medidata Solutions, Inc., 350 Hudson Street, 9Th Floor New York NY 10014		No	No	No	Yes

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2015-02-09	9,946	$18.76	55,727	No	4	M	Direct
Common Stock	Acquisiton	2015-02-09	2,553	$37.51	58,280	No	4	M	Direct
Common Stock	Disposition	2015-02-09	12,499	$44.43	45,781	No	4	S	Direct
Common Stock	Disposition	2015-02-10	934	$45.38	44,847	No	4	F	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	F	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2015-02-09	9,946	$0.00	9,946	$18.76
Common Stock	Stock Option (right to buy)	Disposition	2015-02-09	2,553	$0.00	2,553	$37.51

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
46,301		2022-10-29	No	4	M	Direct
34,947		2022-10-29	No	4	M	Direct

Footnotes

Included are 206 shares which were purchased pursuant to the terms of the Medidata Solutions, Inc. Employee Stock Purchase Plan on December 31, 2014.
Such transaction was executed in multiple trades at prices ranging from $44.40 to $44.57. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
Shares withheld by Medidata to satisfy the tax withholding obligation in connection with the vesting of previously awarded restricted stock.
The options vested as to 25% of the shares on October 29, 2013 and 1/36th of the remaining options will become exercisable each month thereafter for the next 36 months.
The options vested as to 25% of the shares on October 29, 2013 and 1/36th of the remaining options will become exercisable each month thereafter for the next 36 months