(e) Compensatory Arrangements of Certain Officers

At its meeting on February 14, 2013, the compensation committee (the "Committee") of the board of directors of Medidata Solutions, Inc. (the "Company") approved the following compensatory arrangements for its named executive officers (current employees who are identified as "named executive officers" in the Company's proxy statement in connection with the 2012 annual meeting of shareholders):

2012 Annual Cash Bonuses. The Committee determined the annual cash bonus awards for 2012 for each of the Company's named executive officers, based on its assessment of achievement of the 2012 performance targets previously set by the Committee, as follows: Tarek Sherif (Chairman and Chief Executive Officer)-$492,893; Glen de Vries (President)-$492,893; Cory Douglas (Chief Financial Officer)-$265,830; Steven Hirschfeld (EVP-Customer Operations)-$415,359; and Lineene Krasnow (EVP-Product and Marketing)-$165,000.

2013 Salaries and Bonus Targets. The Committee approved 2013 salaries and target cash bonus amounts for the Company's executive officers. The 2013 cash bonuses for the Chief Executive Officer and President will be determined by the Committee based 100% on the achievement of corporate financial performance objectives (revenue and EBITDAO) and the 2013 cash bonuses for all other executives will be determined by the Committee based 75% on these corporate financial performance objectives and 25% based on individual performance objectives.

The table below sets forth the 2013 salaries and target cash bonus amounts of the Company's named executive officers (other than Ms. Krasnow, as noted below):

                                                                   2013        2013 Bonus
Name                                Office                        Salary         Target
Tarek A.
Sherif            Chairman and Chief Executive Officer            $475,000        $475,000
Glen M. de
Vries             President                                       $475,000        $475,000
Cory Douglas      EVP & Chief Financial Officer                   $330,000        $198,000
Steven I.
Hirschfeld        EVP - Customer Operations                       $325,000        $325,000

As previously disclosed, on January 4, 2013, the Company and Lineene Krasnow entered into a separation agreement in connection with Ms. Krasnow's pending retirement. In accordance with the terms of Ms. Krasnow's separation agreement, Ms. Krasnow will receive her existing base salary of $309,000 through her June 30, 2013 termination date and will receive an additional lump sum severance payment of $206,000.

2012 TSR Bonus Pool. The Committee approved the creation of a bonus pool of $7.0 million (representing approximately 1.46% of the $478.9 million increase in the Company's market capitalization during 2012), payable to executive officers and certain senior-vice presidents in connection with the Company's sales performance and accelerated growth rate in

                                                                    Number of
                                                                    Shares of
                                                                    Restricted
                                           Office                     Stock
     Tarek A. Sherif        Chairman and Chief Executive Officer         37,846
     Glen M. de Vries       President                                    37,846
     Cory Douglas           EVP & Chief Financial Officer                12,067
     Steven I. Hirschfeld   EVP-Customer Operations                      21,939

2013 Equity Awards. The Committee approved equity awards for 2013 pursuant to the Amended and Restated 2009 Long-Term Incentive Plan, with 25% of such awards being in the form of shares of restricted stock with service-based vesting, and 75% of such awards being in the form of restricted stock units with performance-based vesting ("PBRSUs").

The shares of restricted stock will vest annually over a four-year period from grant, 25% on the first anniversary of the grant date and each of the next three annual anniversaries of the grant date, subject to continued employment with the Company. Each PBRSU represents a contingent right to receive 0-200% of the target number of shares. The number of shares actually earned shall be in a range from 0% to 200% of the target amount, with two-thirds of the award vesting based on the Company's achievement of performance goals based on 2013 revenue guidance and minimum profitability and one-third of the award vesting based on the Company's total stockholder return ("TSR") for the year ending December 31, 2013 relative to the TSR of companies in the NASDAQ Composite Index for 2013. The shares issued in settlement of the PBRSUs will vest annually over three years from the grant date.

The table below sets forth the 2013 awards of restricted stock and PBRSUs awarded to the following named executive officers:

                                                                                   Number of
                                                                                    PBRSUs
                                                                                     (75%)
                                                                         2013  Revenue
                                                        Number of          Guidance
                                                        Shares of             and              2013
                                                        Restricted          Minimum          Relative
                                                          Stock          Profitability          TSR
Name                           Office                     (25%)            (66 2/3%)         (33 1/3%)
Tarek A.
Sherif          Chairman and Chief Executive Officer         15,468              30,936          15,468
Glen M. de
Vries           President                                    15,468              30,936          15,468
Cory Douglas    EVP & Chief Financial Officer                 6,187              12,374           6,187
Steven I.
Hirschfeld      EVP-Customer Operations                       6,500              13,000           6,500

If the CAGR for the three-year performance period is less than 20%, the payout under the long-term PBRSUs will be at 0%. The number of shares actually earned will be at the maximum 300% if (1) the CAGR for the three-year performance period is at least 20%, and (2) the Company's absolute TSR during the performance period is 100%. In addition, the number of shares actually earned will be at the maximum 300% if (1) the CAGR for the three-year performance period is at least 27.5% and (2) the Company's absolute TSR is positive during the performance period (if the Company's absolute TSR during the performance period is negative, the payout under the long-term PBRSUs will be capped at 100%). The Committee determined that the number of shares earned under the long-term PBRSUs will not exceed 100% unless the Company's stockholders have approved an amendment to Amended and Restated 2009 Long-Term Incentive Plan to increase the number of shares that the Company may issue under the plan by at least 638,461 shares on or prior to December 31, 2015.

The table below sets forth the 2013 long-term PBRSUs awarded to the following named executive officers:

                                                                    Number of
                                                                     PBRSUs
                                                                    (CAGR and
   Name                                  Office                   Absolute TSR)
   Tarek A. Sherif        Chairman and Chief Executive Officer            62,484
   Glen M. de Vries       President                                       62,484
   Cory Douglas           EVP & Chief Financial Officer                   23,168
   Steven I. Hirschfeld   EVP-Customer Operations                         35,652