X0306 4 2015-03-02 0 0001393818 Blackstone Group L.P. BX 0001238989 JAMES HAMILTON E C/O THE BLACKSTONE GROUP L.P. 345 PARK AVENUE NEW YORK NY 10154 1 1 0 0 President and COO Common units representing limited partner interests 2015-03-02 4 S 0 870000 38.12 D 1130000 I See footnote Common units representing limited partner interests 2015-03-03 4 S 0 475000 37.93 D 655000 I See footnote Common units representing limited partner interests 2015-03-04 4 S 0 455738 38.09 D 199262 I See footnote Common units representing limited partner interests 2015-03-04 4 S 0 199262 38.67 D 0 I See footnote Common units representing limited partner interests 20176 D The price reported in Column 4 is a weighted average price. These units were sold in multiple transactions at prices ranging from $37.95 to $38.20, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of units sold at each separate price for all transactions reported on this Form 4. These units are held in a limited liability company beneficially owned by the Reporting Person, his spouse and a trust for the benefit of the Reporting Person's children. The price reported in Column 4 is a weighted average price. These units were sold in multiple transactions at prices ranging from $37.72 to $38.28, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of units sold at each separate price for all transactions reported on this Form 4. The price reported in Column 4 is a weighted average price. These units were sold in multiple transactions at prices ranging from $37.54 to $38.53, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of units sold at each separate price for all transactions reported on this Form 4. The price reported in Column 4 is a weighted average price. These units were sold in multiple transactions at prices ranging from $38.55 to $38.82, inclusive. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of units sold at each separate price for all transactions reported on this Form 4. The Reporting Person disclaims beneficial ownership of the securities reported on this form except to the extent of his pecuniary interest. Tabea Y. Hsi as Attorney-In-Fact 2015-03-04