QUINTILES TRANSNATIONAL HOLDINGS INC. 4820 Emperor Boulevard Durham, NC 27703

Exhibit 10.3

QUINTILES TRANSNATIONAL HOLDINGS INC.

4820 Emperor Boulevard

Durham, NC 27703

May 8, 2013

Aisling Capital II, L.P.

888 Seventh Avenue, 30^th Floor

New York, NY 10106

Ladies and Gentlemen:

This letter confirms our understanding that the letter agreement as of January 22, 2008 between Quintiles Transnational Corp. (the “Company”) and Aisling Capital II, L.P. (the “Investor”) with respect to certain management rights will terminate upon the consummation of the sale of shares of Quintiles Transnational Holdings Inc., as successor to the Company (“Holdings”), pursuant to a registration statement filed by Holdings under the Securities Act of 1933, as amended, in connection with the firm commitment underwritten offering of its securities to the general public. Following the consummation of such a public offering, the Investor agrees that Holdings shall no longer be required to invite a representative of the Investor to attend all meetings of Holdings’ Board of Directors in a nonvoting observer capacity.