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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
1529711	Charles Bryan Spielman	C/O Medidata Solutions, Inc. 79 Fifth Avenue, 8Th Floor New York NY 10003		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	Explanation
Common Stock	Acquisiton	2013-03-04	11,000	$16.89	30,862	No	4	M	Direct
Common Stock	Disposition	2013-03-04	11,000	$53.51	19,862	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Common Stock	Disposition	2013-03-04	11,000	$0.00	11,000	$16.89

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
58,000		2021-09-19	No	4	M	Direct

Footnotes

Such transaction was executed in multiple trades at prices ranging from $53.50 to $53.53. 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.
The options vested as to 25% of the shares on September 19, 2012 and, thereafter, 1/36th of the shares underlying the option on the monthly anniversary for each of the next 36 months.