X0306 4 2017-05-19 0 0001110805 NuStar Energy L.P. NS 0001314252 ROSIER WILLIAM GRADY 19003 1H-10 WEST SAN ANTONIO TX 78257 1 0 0 0 Common Units 2017-05-19 4 P 0 5000 46.3984 A 14715 I By Trust A Common Units 9500 I By Trust B Common Units 7493 D This transaction was executed in multiple trades at prices ranging from $46.37 per unit to $46.40 per unit. The price reported above reflects the weighted average purchase price. Note that due to field restrictions in Table 1, Column 4, the last decimal places do not appear. The total weighted average purchase price is actually $46.398379. Upon request from the Securities and Exchange Commission, the issuer or a unitholder of the issuer, full information regarding the number of units purchased at each separate price will be made available. The amount of securities beneficially owned reflects units transferred to family trusts, constituting only a change in form of beneficial ownership. /s/ Michelle S. Miller, as Attorney-in-Fact for W. Grady Rosier 2017-05-23