X0306 4 2014-02-28 0001022079 QUEST DIAGNOSTICS INC DGX 0001477972 Cohen Jon R C/O QUEST DIAGNOSTICS 3 GIRALDA FARMS MADISON NJ 07940 1 SVP and Chief Medical Officer Common Stock 2014-02-28 4 F 0 617 52.915 D 59131 D Disposition of common stock to the issuer solely to cover tax withholding obligations arising from the vesting of a previous grant of restricted share units. The amount includes exempt purchases made under the Company's stock purchase plan. /s/ William J. O'Shaughnessy, Jr., Attorney in Fact for Jon R. Cohen 2014-03-03